abbreviata, Cylindrella abbreviata Deshayes, 1851 - syn of: Urocoptis brevis (Pfeiffer, 1841)
abbreviatus, Microceramus abbreviatus (Pfeiffer)
abdita, Callocoptis abdita (Arango, 1880)
abnormis, Steatocoptis abnormis (Gundlach, 1903)
abraensis, Tomelasmus irroratus abraensis Torre & Bartsch
abraensis, Callocoptis abraensis Torre & Bartsch, 1972
abraensis, Microceramus abraensis Torre & Bartsch, 2008
acanthidia, Holospira acanthidia Thompson & Mihalcik, 2005
acanthophorea, Coelocentrum acanthophorea Von Martens, 1901 - syn of: Ptychodonta astrophorea (Dall, 1897)
accola, Bialasmus accola Torre & Bartsch, 1972
acicularis, Torrecoptis acicularis (Torre, 1912)
acus, Tetrentodon acus Torre & Bartsch, 1972
acus, Tomelasmus acus Torre & Bartsch, 2008
acus bartschi, Tomelasmus acus bartschi (Aguayo, 1932)
acus culminis, Tomelasmus acus culminis Torre & Bartsch, 1972
acus dolorisensis, Tomelasmus acus dolorisensis Torre & Bartsch, 1972
acus minor, Tomelasmus acus minor Torre & Bartsch, 1972
adamsi, Anoma adamsi Pilsbry, 1903
adamsiana, Cylindrella adamsiana Chitty, 1853 - syn of: Urocoptis baquieana Chitty, 1855
adana, Coelostemma adana (Bartsch, 1926)
adelphion, Coelocentrum tomacella adelphion Thompson
adnatus, Tomelasmus adnatus (Pfeiffer, 1864)
adnatus franciscanus, Tomelasmus adnatus franciscanus Torre & Bartsch, 1972
adnatus guamaensis, Tomelasmus adnatus guamaensis Torre & Bartsch, 1972
adria, Coelostemma adria (Bartsch, 1926)
aequatoris, Arangia aequatoris (Morelet, 1873)
affinis, Uncinicoptis affinis (Pfeiffer, 1864)
affinis, Crossostephanus affinis Thompson & Correa-Sandoval, 1994
agnesiana, Brachypodella agnesiana Adams, 1849
aguadoresensis, Macroceramus aguadoresensis Torre & Bartsch, 1972
aguayoi, Torrecoptis columbarii aguayoi Torre & Bartsch
aguayoi, Tetrentodon aguayoi Torre & Bartsch, 1948
aguayoi, Microceramus aguayoi Torre & Bartsch, 1972
aguerreverei, Holospira aguerreverei Hanna & Hertlein, 1929
agustini, Centralia concolor agustini Torre & Bartsch
agustini, Cochlodinella agustini Torre & Bartsch, 1972
alabastrinum, Mychostoma alabastrinum (Pfeiffer, 1845)
alamellata, Sonoraloa dentaxis alamellata Gilbertson
alba striatula, Cylindrella alba striatula Adams, 1849 - syn of: Mychostoma album (Adams, 1849)
albertoi, Holospira albertoi Bartsch, 1947
albicostulata, Torrecoptis bacillaris albicostulata Torre
albida, Brachypodella albida Pilsbry, 1903
alboanfractus, Anoma alboanfractus (Chitty)
albocrenata, Paracallonia albocrenata (Gundlach, 1873)
albocrenata fallax, Paracallonia albocrenata fallax Torre & Bartsch, 1972
album, Mychostoma album (Adams, 1849)
album eos, Mychostoma album eos Pilsbry, 1903 - syn of: Mychostoma album (Adams, 1849)
album minima, Mychostoma album minima Pilsbry, 1903 - syn of: Mychostoma album (Adams, 1849)
album occidentalis, Mychostoma album occidentalis Pilsbry, 1903 - syn of: Mychostoma album (Adams, 1849)
album striata, Mychostoma album striata Pilsbry, 1903 - syn of: Mychostoma album (Adams, 1849)
alcaldei, Cochlodinella alcaldei Torre & Bartsch, 1972
alegrensis, Microceramus alegrensis Torre & Bartsch, 1972
alfredoi, Idiostemma alfredoi Franke & Fernández Velázquez, 2007
alleni, Tetrentodon alleni (Torre, 1929)
alleri, Urocoptis alleri Torre, 1930
alternans, Cochlodinella alternans Torre & Bartsch, 1972
altosongoensis, Gongylostomella strigis altosongoensis Torre & Bartsch
altum, Spirostemma altum (Sowerby, 1875)
alvarezensis, Holospira alvarezensis Bartsch, 1926 - syn of: Holospira palmeri Bartsch, 1906
alvearis, Centralia alvearis (Torre, 1911)
amalthea, Holospira amalthea Bartsch, 1926
ambigua, Urocoptis ambigua (Adams, 1849)
ambigua elizabethensis, Urocoptis ambigua elizabethensis Pilsbry & Jarvis, 1903 - syn of: Urocoptis ambigua (Adams, 1849)
ambigua medinae, Urocoptis ambigua medinae Baker, 1935 - syn of: Urocoptis ambigua (Adams, 1849)
amethystina, Urocoptis amethystina (Chitty, 1855)
amethystina cerina, Cylindrella amethystina cerina Chitty, 1855 - syn of: Urocoptis amethystina (Chitty, 1855)
amica, Torrecoptis amica Torre & Bartsch, 1972
amicorum, Pycnoptychia amicorum Torre & Bartsch, 1972
amicorum, Macroceramus amicorum Torre & Bartsch, 1972
amicorum ramirezi, Pycnoptychia amicorum ramirezi Torre & Bartsch, 1972
amoenivallis, Nodulia amoenivallis (Pilsbry, 1929)
amplaxis, Apertaxis amplaxis Pilsbry, 1953 - syn of: Apertaxis coahuilensis (Bartsch, 1906)
amplaxis, Dissotropis amplaxis Thompson, 1968
amplus, Spiroceramus amplus (Pfeiffer, 1858)
anaclasta, Coelostemma anaclasta Thompson, 1971
anafensis, Torrecoptis anafensis (Henderson, 1916)
anafensis, Microceramus anafensis Henderson, 1916
anconai, Coelocentrum anconai Bartsch, 1948
anconai, Coelostemma anconai Bartsch, 1951
andresensis, Cenocoptis andresensis Torre & Bartsch, 1972
andresensis ayuaensis, Cenocoptis andresensis ayuaensis Torre & Bartsch, 1972
andresensis campamentensis, Cenocoptis andresensis campamentensis Torre & Bartsch, 1972
andresensis vagans, Cenocoptis andresensis vagans Torre & Bartsch, 1972
andromeda, Holospira andromeda Bartsch, 1926
angulatus, Macroceramus angulatus Weinland & Von Martens, 1859
angulifera, Brachypodella angulifera (Gundlach, 1858)
angulosus, Microceramus angulosus (Gundlach, 1857)
angustior, Capillacea angustior (Wright, 1864)
angustior guamaensis, Capillacea angustior guamaensis Torre & Bartsch, 1972
anomala, Bostrichocentrum anomala Pilsbry, 1953
anomalum, Coelocentrum anomalum Strebel, 1880
antiperversa, Brachypodella antiperversa (Férussac, 1832)
antoniensis, Tomelasmus assimilis antoniensis Torre & Bartsch
antoniensis, Liocallonia antoniensis Torre & Bartsch, 1972
antonioensis, Cochlodinella antonioensis Torre & Bartsch, 1972
antonitensis, Tetrentodon antonitensis Torre & Bartsch, 1972
antricola, Coelostemma bourgeoisana antricola Bartsch
arangiana, Gongylostoma arangiana (Gundlach, 1878)
arangoi, Macroceramus clerchi arangoi Pfeiffer
arctispira, Coelocentrum arctispira (Pfeiffer, 1860)
arctispira estefaniae, Coelocentrum arctispira estefaniae Pilsbry, 1902
arctispirus, Microceramus concisus arctispirus Ancey
arcuata, Autocoptis arcuata (Weinland & Von Martens, 1859)
arcustriatus, Tomelasmus arcustriatus (Wright, 1863)
arellanoi, Holospira arellanoi (Bartsch, 1945)
argiphrix, Autocoptis argiphrix Thompson & Franz, 1976
arizonensis, Holospira arizonensis Stearns, 1890
artemisiae, Gongylostoma artemisiae (Gundlach, 1863)
arthuri, Liocallonia arthuri Torre & Bartsch, 1972
asinorum, Badiofaux asinorum Torre & Bartsch, 1972
aspera, Urocoptis aspera (Adams, 1849)
asperata, Cylindrella asperata Sowerby, 1875 - syn of: Simplicervix inornata (Adams, 1849)
assimilis, Tomelasmus assimilis (Arango, 1884)
assimilis antoniensis, Tomelasmus assimilis antoniensis Torre & Bartsch, 1972
astraxis, Crycoryne astraxis Thompson, 1971
astrophorea, Ptychodonta astrophorea (Dall, 1897)
atkinsi, Torrecoptis atkinsi (Torre & Clench, 1930)
atra, Ventricochis atra Torre & Bartsch, 1972
atrata, Nodulia vignalensis atrata Torre & Bartsch
atropurpurea, Ventricochis atropurpurea (Arango, 1882)
atropurpurea encinarensis, Ventricochis atropurpurea encinarensis Torre & Bartsch, 1972
atropurpurea rinconadensis, Ventricochis atropurpurea rinconadensis Torre & Bartsch, 1972
atropurpurea rinconadoensis, Ventricochis atropurpurea rinconadoensis Torre & Bartsch, 1972 - syn of: Ventricochis atropurpurea rinconadensis Torre & Bartsch, 1972
attenuapex, Goniapex attenuapex Thompson, 1988
attenuata, Liocallonia attenuata Torre & Bartsch, 1972
attenuatum, Coelocentrum tomacella attenuatum Pfeiffer
attenuatum, Cylindrella attenuatum Pfeiffer, 1856 - syn of: Coelocentrum tomacella attenuatum (Pfeiffer, 1856)
auberiana, Poeycoptis auberiana (D'Orbigny, 1842)
augustae, Cylindrella augustae Adams, 1850 - syn of: Bactrocoptis hollandi (Adams, 1850)
augustini, Cochlodinella augustini Torre & Bartsch, 1972
aurantiaca, Holospira aurantiaca Thompson & Mihalcik, 2005
aurea, Cochlodinella blainiana aurea Pilsbry
aurulenta, Capillacea pulcherrima aurulenta Torre & Bartsch
australis, Oligostylus australis Thompson, 1963
ayuaensis, Cenocoptis andresensis ayuaensis Torre & Bartsch
ayuaensis, Ventricochis ayuaensis Torre & Bartsch, 1972
azucarensis, Tomelasmus azucarensis Torre & Bartsch, 1972
bachia, Holospira bachia Bartsch, 1926
bacillaris, Torrecoptis bacillaris (Torre, 1912)
bacillaris albicostulata, Torrecoptis bacillaris albicostulata (Torre, 1912)
bacillaris boqueronis, Torrecoptis bacillaris boqueronis (Pilsbry, 1912)
bacillaris chambaensis, Torrecoptis bacillaris chambaensis Torre & Bartsch, 1972
bacillaris exilis, Torrecoptis bacillaris exilis (Torre, 1912)
bacillaris maguirrensis, Torrecoptis bacillaris maguirrensis Torre & Bartsch, 1972
bacillaris petrophila, Torrecoptis bacillaris petrophila (Pilsbry, 1930)
bacillaris petrophilla, Torrecoptis bacillaris petrophilla (Pilsbry, 1929)
bacillaris sordidula, Torrecoptis bacillaris sordidula (Torre, 1915)
bacillaris vivax, Torrecoptis bacillaris vivax (Pilsbry, 1930)
baculum, Torrecoptis baculum (Pilsbry, 1903)
bahamensis, Brachypodella bahamensis (Pfeiffer, 1860)
baitiquiriensis, Macroceramus claudens baitiquiriensis Torre & Bartsch
balesi, Coelostemma balesi Pilsbry, 1954
balnearum, Nodulia vignalensis balnearum Pilsbry
balsasensis, Coelostemma balsasensis (Bartsch, 1926)
banaoensis, Gongylostomella banaoensis Torre & Bartsch, 1972
baquieana, Urocoptis baquieana Chitty, 1855
baquieana pudica, Urocoptis baquieana pudica Pilsbry & Jarvis, 1903 - syn of: Urocoptis baquieana Chitty, 1855
baracoensis, Brachypodella baracoensis Torre & Bartsch, 1972
barbadensis, Pseudopineria barbadensis Kraus, 1996
barbouri, Torrecoptis barbouri (Clench & Torre, 1930)
barbouri, Spiroceramus barbouri Aguayo, 1958
barbouri exquisita, Torrecoptis barbouri exquisita (Clench, 1966)
barrerai, Tomelasmus hesperius barrerai Torre & Bartsch
barretticola, Torrecoptis barretticola Torre & Bartsch, 1972
barroi, Tetrentodon barroi Torre & Bartsch, 1972
bartschi, Tomelasmus acus bartschi Aguayo
bartschi, Coelostemma bartschi Pilsbry & Clapp, 1909
beatensis, Macroceramus beatensis Bartsch, 1932
beathiana, Pineria beathiana Poey, 1854
bellevuense, Spirostemma bellevuense Pilsbry, 1903
bembix, Coelostemma bembix Thompson, 1971
bermudezi, Microceramus bermudezi Pilsbry & Torre, 1929
bermudezi, Bermudezicoptis bermudezi Torre & Bartsch, 1972
bermudezi, Orienticoptis bermudezi Torre & Bartsch, 1972
bermudezi cienfuegosensis, Microceramus bermudezi cienfuegosensis Clench & Aguayo, 1949
bermudezi infirmus, Microceramus bermudezi infirmus Torre & Bartsch, 2008
biayensis, Heterocoptis biayensis Torre & Bartsch, 1972
bibijaguaensis, Nesocoptis pruinosa bibijaguaensis Torre & Bartsch
bibijaguensis, Nesocoptis pruinosa bibijaguensis Torre & Bartsch
bicolor, Gongylostomella bicolor Torre & Bartsch, 1972
bicorda, Heterocoptis bicorda Torre & Bartsch, 1972
bierigi, Liocallonia bierigi Torre & Bartsch, 1972
bijaensis, Tetrentodon bijaensis Torre & Bartsch, 1972
bilamellata, Holospira bilamellata Dall, 1895
bilamellata, Bialasmus bilamellata Torre & Bartsch, 1972
binneyana, Cylindrella binneyana Pfeiffer, 1845 - syn of: Urocoptis nobilior Adams, 1845
bioscai, Steatocoptis bioscai Torre & Bartsch, 1972
bioscai, Macroceramus bioscai Torre & Bartsch, 2008
bioscai cincorrealensis, Macroceramus bioscai cincorrealensis Torre & Bartsch, 2008
bioscanus, Microceramus bioscanus Torre & Bartsch, 2008
bioscanus montanus, Microceramus bioscanus montanus Torre & Bartsch, 2008
biperlata, Carcinostemma biperlata Torre & Bartsch, 1972
blaini, Macroceramus blaini Arango, 1866
blainiana, Cochlodinella blainiana (Gundlach, 1863)
blainiana aurea, Cochlodinella blainiana aurea (Pilsbry, 1903)
blandi, Dissotropis blandi (Bartsch, 1906)
blandiana, Cylindrella blandiana Pfeiffer, 1854 - syn of: Anoma solida (Adams, 1851)
blandianum, Oligostylus blandianum (Crosse & Fischer, 1870)
blanesi, Pfeiffericoptis blanesi Torre & Bartsch, 1972
bonachensis, Centralia bonachensis Torre & Bartsch, 1972
bonairensis, Microceramus bonairensis (Smith, 1898)
bonillensis, Tetrentodon bonillensis Torre & Bartsch, 1972
boqueronis, Torrecoptis bacillaris boqueronis Pilsbry
boqueronis, Macroceramus pupoides boqueronis Sánchez Roig
borjeensis, Johaniceramus longus borjeensis Torre & Bartsch
bosquensis, Liocallonia bosquensis Torre & Bartsch, 1972
boucardi, Resupinata speciosum boucardi Pfeiffer
boucardi, Cylindrella boucardi Pfeiffer, 1856 - syn of: Resupinata speciosum boucardi (Pfeiffer, 1856)
boucardi minor, Eucalodium boucardi minor Fischer & Crosse, 1873 - syn of: Resupinata speciosum (Dunker, 1844)
bourgeoisae, Ptychocentrum bourgeoisae Bartsch, 1943 - syn of: Ptychocentrum marianum (Bartsch, 1943)
bourgeoisae, Schizopile bourgeoisae Pilsbry, 1939
bourgeoisana, Coelostemma bourgeoisana Bartsch, 1942
bourgeoisana antricola, Coelostemma bourgeoisana antricola Bartsch, 1943
bourguignatiana, Brachypodella bourguignatiana (Ancey, 1886)
brachyacron, Ptychodonta brachyacron Thompson & Correa-Sandoval, 1994
brevicervix, Uncinicoptis brevicervix (Pilsbry, 1903)
brevicollis, Tetrentodon brevicollis Pilsbry, 1903
brevis, Urocoptis brevis (Pfeiffer, 1841)
brevis obesa, Urocoptis brevis obesa Adams, 1845
brooksiana, Brachypodella brooksiana Pfeiffer, 1859
broquelensis, Cochlodinella broquelensis Torre & Bartsch, 1972 - syn of: Cochlodinella broquelesensis Torre & Bartsch, 1972
broquelesensis, Cochlodinella broquelesensis Torre & Bartsch, 1972
browni, Acrocoptis browni Torre & Bartsch, 1972
brunnescens, Liocallonia brunnescens (Gundlach, 1863)
bryantwalkeri, Goniapex bryantwalkeri (Pilsbry, 1917)
bucuyensis, Gongylostomella hilleri bucuyensis Torre & Bartsch
caballoensis, Nesocoptis pruinosa caballoensis Torre & Bartsch
cabocruzensis, Microceramus cabocruzensis Torre & Bartsch, 1972
cabrasensis, Uncinicoptis hidalgoi cabrasensis Pilsbry & Henderson
cabrerai, Nodulia vignalensis cabrerai Torre & Bartsch
cacarajicaraensis, Liocallonia cacarajicaraensis Torre & Bartsch, 1972
cachimboensis, Heterocoptis cachimboensis Torre & Bartsch, 1972
caeciliae, Poeycoptis caeciliae (Gundlach, 1876)
caerulans, Urocoptis caerulans Poey, 0 - syn of: Poecilocoptis coerulescens (Poey, 1874)
caguanensis, Cochlodinella caguanensis Torre & Bartsch, 1972
caiguanaboensis, Organocoptis caiguanaboensis Torre & Bartsch, 1972
caiguanaboensis, Ventricochis caiguanaboensis Torre & Bartsch, 1972
caimitensis, Sagracoptis robusta caimitensis Torre & Bartsch
caimitensis, Tomelasmus irroratus caimitensis Torre & Bartsch
callida, Tetrentodon gracillima callida Torre & Bartsch
camagueyana, Torrecoptis camagueyana (Torre, 1911)
camariocaensis, Microceramus camariocaensis Torre & Bartsch, 1972
camaronensis, Tetrentodon camaronensis Torre & Bartsch, 1972
camayenensis, Microceramus camayenensis Torre & Bartsch, 2008 - syn of: Microceramus camayensis Torre & Bartsch, 1972
camayensis, Microceramus camayensis Torre & Bartsch, 1972
camoensis, Tetrentodon camoensis (Pfeiffer, 1855)
campamentensis, Cenocoptis andresensis campamentensis Torre & Bartsch
campestris, Holospira campestris Pilsbry & Ferriss, 1915
campoi, Haplocion campoi Bartsch, 1943
canaletensis, Liocallonia canaletensis Torre & Bartsch, 1972
canaletensis rinconadensis, Liocallonia canaletensis rinconadensis Torre & Bartsch, 1972
canaleticola, Ventricochis canaleticola Torre & Bartsch, 1972
canapuensis, Macroceramus pazi canapuensis Torre & Bartsch
canasiensis, Tetrentodon canasiensis Torre & Bartsch, 1972
canimarensis, Macroceramus canimarensis (Pfeiffer, 1839)
canimarensis, Tetrentodon canimarensis Torre & Bartsch, 1972
canimarensis cerroensis, Macroceramus canimarensis cerroensis Sánchez Roig, 1951
caninus, Microceramus caninus Torre & Bartsch, 1972
canteroiana, Gongylostomella canteroiana (Gundlach, 1876)
canteroiana diagonalis, Gongylostomella canteroiana diagonalis (Clench, 1966)
caobaensis, Tetrentodon caobaensis Torre & Bartsch, 1972
capillacea, Capillacea capillacea (Pfeiffer, 1863)
capillacea, Holospira cionella capillacea Pilsbry & Ferriss
capillacea fraterna, Capillacea capillacea fraterna (Pilsbry, 1903)
capitoliensis, Torrecoptis capitoliensis Torre & Bartsch, 1972
caponensis, Nodulia caponensis Torre & Bartsch, 1972
cara, Heterocoptis cara (Pilsbry & Henderson, 1912)
caracunaensis, Torrecoptis caracunaensis Torre & Bartsch, 1972
caracunasensis, Torrecoptis caracunasensis Torre & Bartsch, 1972 - syn of: Torrecoptis caracunaensis Torre & Bartsch, 1972
cardenasensis, Pfeiffericoptis cardenasensis Torre & Bartsch, 1972
cardenasi, Gongylostoma cardenasi Torre & Bartsch, 1972
carinatus, Microceramus carinatus Torre & Bartsch, 1972
carnea, Cylindrella carnea Adams, 1849 - syn of: Urocoptis sanguinea Pfeiffer, 1845
carnea cerina, Cylindrella carnea cerina Adams, 1849 - syn of: Urocoptis sanguinea Pfeiffer, 1845
caroli, Tomelasmus caroli Torre & Bartsch, 1972
casasensis, Nesocoptis pruinosa casasensis Torre & Bartsch
castanea, Trilamellaxis castanea (Torre, 1911)
castanea castanella, Trilamellaxis castanea castanella Torre & Bartsch, 1972
castanedoi, Spiroceramus castanedoi Torre & Bartsch, 1972
castanella, Trilamellaxis castanea castanella Torre & Bartsch
castaneum, Dissotropis castaneum Thompson, 1968
cataclines, Coelocentrum cataclines Thompson, 1968
catalinensis, Organocoptis catalinensis Torre & Bartsch, 1972
catenatus, Macroceramus catenatus Gundlach, 1859
catorceana, Holospira catorceana Pilsbry, 1953
cavernicola, Badiofaux cavernicola Torre & Bartsch, 1972
cavicostata, Heterocoptis cavicostata Torre & Bartsch, 1972
caymanensis, Cyclauchen caymanensis Pilsbry, 1930
caymanensis, Microceramus caymanensis Pilsbry, 1942
ceciliasensis, Tetrentodon ceciliasensis Torre & Bartsch, 1972
ceiba, Tetrentodon ceiba Torre & Bartsch, 1972
ceibamochensis, Tetrentodon ceibamochensis Torre & Bartsch, 1972
celsa, Pycnoptychia humboldtii celsa Torre & Bartsch
centicostata, Bostrichocentrum centicostata Thompson, 1964
centralis, Microceramus centralis Jaume & Torre
cereum, Resupinata cereum (Strebel, 1880)
cerroensis, Macroceramus canimarensis cerroensis Sánchez Roig
chambaensis, Centralia chambaensis (Pilsbry, 1929)
chambaensis, Torrecoptis bacillaris chambaensis Torre & Bartsch
chambasensis, Centralia chambasensis Pilsbry, 1929 - syn of: Centralia chambaensis (Pilsbry, 1929)
championi, Coelocentrum championi Von Martens, 1897
chemnitzianum, Apoma chemnitzianum (Férussac, 1821)
chilpancingoensis, Coelostemma chilpancingoensis Pilsbry, 1953
chinensis, Liocallonia chinensis Torre & Bartsch, 1972
chiricahuana, Holospira chiricahuana Pilsbry, 1905
chonomphix, Hendersoniella lux chonomphix Thompson & Correa-Sandoval
chordata, Brachypodella chordata (Pfeiffer, 1855)
chorrerensis, Tomelasmus chorrerensis Torre & Bartsch, 1972
chorrillensis, Tetrentodon gravidula chorrillensis Jaume & Torre
chorrillensis, Heterocoptis chorrillensis Torre & Bartsch, 1972
christmani, Hendersoniella christmani Thompson & Correa-Sandoval, 1994
cienfuegoensis, Microceramus cienfuegoensis Torre & Bartsch, 1972
cienfuegosensis, Microceramus bermudezi cienfuegosensis Clench & Aguayo
cincorrealensis, Macroceramus bioscai cincorrealensis Torre & Bartsch
cinerea, Torrecoptis cinerea (Pfeiffer, 1850)
cionella, Holospira cionella Pilsbry, 1905
cionella capillacea, Holospira cionella capillacea Pilsbry & Ferriss, 1905
cioniscus, Centralia cioniscus (Torre, 1911)
cisnerosi, Pycnoptychia humboldtii cisnerosi Torre & Bartsch
clara, Liocallonia clara (Wright, 1865)
claritaensis, Tetrentodon claritaensis Torre & Bartsch, 1972
clathratum, Coelocentrum clathratum Von Martens, 1897
claudens, Macroceramus claudens Gundlach, 1859
claudens baitiquiriensis, Macroceramus claudens baitiquiriensis Torre & Bartsch, 2008
clava, Coelocentrum tomacella clava Pfeiffer
clava, Cylindrella clava Pfeiffer, 1865 - syn of: Coelocentrum tomacella clava (Pfeiffer, 1856)
clava, Heterocoptis clava Torre & Bartsch, 1972
clava rufescens, Coelocentrum clava rufescens Von Martens, 1897 - syn of: Coelocentrum tomacella rufescens Von Martens, 1897
claviformis, Holospira claviformis Von Martens, 1897 - syn of: Coelostemma elizabethae (Pilsbry, 1889)
clavigeroi, Spartocentrum irregularis clavigeroi Hanna
clavigeroi, Coelocentrum clavigeroi Hanna, 1923 - syn of: Spartocentrum irregularis clavigeroi (Hanna, 1923)
clenchi, Tetrentodon clenchi (Aguayo, 1932)
clerchi, Tetrentodon clerchi (Arango, 1870)
clerchi, Macroceramus clerchi Arango, 1866
clerchi arangoi, Macroceramus clerchi arangoi Pfeiffer, 1866
clerchi imiasensis, Macroceramus clerchi imiasensis Torre & Bartsch
clerchi jaucosensis, Macroceramus clerchi jaucosensis Sánchez Roig
coahuilenis, Coelostemma coahuilenis Bartsch, 1906
coahuilensis, Apertaxis coahuilensis (Bartsch, 1906)
coahuilensis, Haplocion coahuilensis (Binney, 1865)
cocaensis, Tetrentodon cocaensis Jaume & Torre, 1975
cocaensis, Gongylostoma planospira cocaensis Torre & Bartsch
cochisei, Holospira danielsi cochisei Pilsbry & Ferriss
cockerelli, Holospira cockerelli Dall, 1897
coerulans, Poecilocoptis coerulans (Poey, 1864)
coerulens, Poecilocoptis coerulens Poey, 1874 - syn of: Poecilocoptis coerulescens (Poey, 1874)
coerulescens, Poecilocoptis coerulescens (Poey, 1874)
cognatum, Spirostemma cognatum (Vendryes, 1901)
coliseoensis, Tetrentodon coliseoensis Torre & Bartsch, 1972
coliseoensis, Microceramus coliseoensis Torre & Bartsch, 1972
collaris, Brachypodella collaris (Férussac, 1821)
coloratus, Tomelasmus coloratus (Arango, 1882)
coloratus minaensis, Tomelasmus coloratus minaensis Torre & Bartsch, 1972
columbarii, Torrecoptis columbarii Torre & Bartsch, 1972
columbarii aguayoi, Torrecoptis columbarii aguayoi Torre & Bartsch, 1972
columna, Cylindrella columna Adams, 1849 - syn of: Urocoptis brevis (Pfeiffer, 1841)
columna intermedia, Cylindrella columna intermedia Adams, 1849 - syn of: Urocoptis brevis (Pfeiffer, 1841)
colymis, Holospira colymis Thompson & Mihalcik, 2005
compactum, Eucalodium compactum Pilsbry, 1893
concinna, Torrecoptis concinna Torre & Bartsch, 1972
concisus, Microceramus concisus (Morelet, 1849)
concisus arctispirus, Microceramus concisus arctispirus (Ancey)
concisus mexicanus, Macroceramus concisus mexicanus Von Martens, 1897 - syn of: Microceramus mexicanus (Von Martens, 1897)
concolor, Centralia concolor Torre & Bartsch, 1972
concolor, Urocoptis concolor Torre, 1950
concolor agustini, Centralia concolor agustini Torre & Bartsch, 1972
concolor minima, Centralia concolor minima Torre & Bartsch, 1972
concolor puntillensis, Centralia concolor puntillensis Torre & Bartsch, 1972
concreta, Pfeiffericoptis concreta (Gundlach, 1863)
confusa, Gongylostoma confusa (Arango, 1882)
conicus, Microceramus conicus Torre & Bartsch, 1972
consanguinea, Sagracoptis consanguinea (Arango, 1882)
consimilis, Gongylostoma consimilis Torre & Bartsch, 1972
constantia, Organocoptis constantia Torre & Bartsch, 1972
contentiosa, Gongylostomella contentiosa (Arango, 1884)
cordylum, Coelostemma cordylum Thompson & Mihalcik, 2011
coronadoi, Sagracoptis coronadoi (Arango, 1864)
corpulenta, Nodulia corpulenta (Spence, 1936)
corralillensis, Cochlodinella corralillensis Torre & Bartsch, 1972
cortinal, Liocallonia volubilis cortinal Torre & Bartsch
cortinoi, Liocallonia cortinoi Torre & Bartsch, 1972
costatum, Coelostemma costatum Thompson & Mihalcik, 2011
costatus, Microceramus costatus Torre & Bartsch, 1972
costellaris, Microceramus costellaris (Gundlach, 1863)
costellaris, Torrecoptis costellaris Torre & Bartsch, 1972
costellaris sinaloensis, Microceramus costellaris sinaloensis Torre & Bartsch, 1972
costulata, Geoscala costulata (Adams, 1849)
costulata, Cylindrella costulata Morelet, 1851 - syn of: Brachypodella speluncae (Morelet, 1852)
costulata savlamari, Geoscala costulata savlamari Baker, 1935 - syn of: Macroceramus costulatus Gundlach, 1859
costulatus, Macroceramus costulatus Gundlach, 1859
cotorricola, Pycnoptychia trina cotorricola Torre & Bartsch
crassa, Pleurostemma intusmalleata crassa Torre & Bartsch
crassilabris, Poecilocoptis crassilabris (Arango, 1882)
crassiuscula, Gongylostoma hilleiana crassiuscula Torre & Bartsch
creightoni, Holospira creightoni Bartsch, 1926 - syn of: Holospira pedroana Bartsch, 1926
crenata, Archegocoptis crenata (Weinland & Von Martens, 1859)
crenatus, Microceramus crenatus (Gundlach, 1864)
crenulatus, Tomelasmus crenulatus (Gundlach, 1857)
crenulatus solatius, Tomelasmus crenulatus solatius Torre & Bartsch, 1972
crenulatus zebra, Tomelasmus crenulatus zebra Torre & Bartsch, 1972
creola, Gongylostomella creola (Aguayo, 1934)
cretacea, Cylindrella cretacea Pfeiffer, 1860
crispula, Sagracoptis crispula (Pfeiffer, 1839)
cristallina, Pfeiffericoptis cristallina (Wright, 1865)
crosseanum, Gymnocentrum crosseanum (Pfeiffer, 1867)
crossei, Holospira crossei Dall, 1895
cubaensis, Microceramus cubaensis Torre & Bartsch, 1972
cubicularia, Nodulia handi cubicularia Torre & Bartsch
cuestai, Liocallonia cuestai (Torre, 1930)
cuetoi, Trilamellaxis remediensis cuetoi Torre & Bartsch
culebrensis, Trilamellaxis parallela culebrensis Torre & Bartsch
culminis, Tomelasmus acus culminis Torre & Bartsch
cumbrensis, Liocallonia cumbrensis Torre & Bartsch, 1972
cumingi, Cylindrella cumingi Adams, 1845 - syn of: Apoma chemnitzianum (Férussac, 1821)
curta, Torrecoptis curta Torre & Bartsch, 1972
cuzcoensis, Cochlodinella variegata cuzcoensis Torre & Bartsch
cuzcoensis, Macroceramus cuzcoensis Torre & Bartsch, 1972
cuzoensis, Macroceramus cuzoensis Torre & Bartsch, 2008 - syn of: Macroceramus cuzcoensis Torre & Bartsch, 1972
cyclostoma, Tetrentodon cyclostoma (Pfeiffer, 1856)
cyclostoma, Holospira cyclostoma Pilsbry, 1953
cylindricus, Urocoptis cylindricus Dillwyn, 1817 - syn of: Urocoptis cylindrus (Dillwyn, 1817)
cylindrus, Urocoptis cylindrus (Dillwyn, 1817)
cylindrus, Cylindrella cylindrus Adams - syn of: Spirostemma dunkeri (Pfeiffer)
dalli, Coelostemma dalli (Pilsbry, 1902)
dalli, Anisospira dalli (Von Martens, 1901)
dalli stringens, Anisospira dalli stringens Thompson, 1968
danielsi, Holospira danielsi Pilsbry & Ferriss, 1915
danielsi cochisei, Holospira danielsi cochisei Pilsbry & Ferriss, 1915
dautzenbergiana, Gongylostoma dautzenbergiana Crosse, 1890
debilis, Liocallonia infortunata debilis Torre & Bartsch
decipiens, Torrecoptis decipiens Torre & Bartsch, 1972
decipiens, Gyraxis decipiens Torre & Bartsch, 1972
decollatum, Eucalodium decollatum (Nyst, 1841)
decollatum gheisbreghti, Eucalodium decollatum gheisbreghti Pfeiffer, 0 - syn of: Eucalodium decollatum (Nyst, 1841)
decollatum guatemalensis, Eucalodium decollatum guatemalensis Bartsch, 1906
decoloratus, Tomelasmus decoloratus (Gundlach, 1863)
decoloratus validus, Tomelasmus decoloratus validus Torre & Bartsch, 1972
decurtatum, Oligostylus decurtatum (Adams, 1872)
delectabilis, Acrocoptis delectabilis (Pilsbry, 1929)
delicatus, Microceramus delicatus Torre & Bartsch, 1972
demolita, Nodulia vignalensis demolita Torre & Bartsch
densecostatum, Resupinata densecostatum (Strebel, 1880)
denserpens, Holospira denserpens Thompson & Mihalcik, 2005
densicostata, Liocallonia densicostata Torre & Bartsch, 1972
dentaxis, Sonoraloa dentaxis (Pilsbry, 1953)
dentaxis alamellata, Sonoraloa dentaxis alamellata Gilbertson, 1993
dentaxis lamellata, Sonoraloa dentaxis lamellata (Pilsbry, 1953)
dentaxis potamia, Sonoraloa dentaxis potamia (Pilsbry, 1953)
dentaxis striatella, Sonoraloa dentaxis striatella (Pilsbry, 1953)
denticulatus, Microceramus denticulatus (Gundlach, 1863)
denticulatus, Tomelasmus denticulatus (Pfeiffer, 1853)
depressicostata, Torrecoptis depressicostata Torre & Bartsch, 1972
deshayesianum, Resupinata deshayesianum (Crosse & Fischer, 1873)
diagonalis, Gongylostomella canteroiana diagonalis Clench
diaphana, Poecilocoptis diaphana (Wright, 1880)
difficultosa, Sagracoptis difficultosa (Arango, 1882)
digueti, Spartocentrum digueti (Mabille, 1895)
dilatata, Centralia dilatata (Torre, 1911)
dimidiata, Centralia dimidiata (Torre, 1911)
diminuta, Mychostoma diminuta Pilsbry, 1903 - syn of: Apoma diminutum Adams, 1851
diminutum, Apoma diminutum Adams, 1851
discors, Poecilocoptis discors (Poey, 1856)
discrepans, Liocallonia discrepans Torre & Bartsch, 1972
dispar, Coelocentrum dispar Pilsbry, 1902
distanter, Centralia tuba distanter Torre & Bartsch
distincta, Sagracoptis distincta (Gundlach, 1876)
distincta mendozana, Sagracoptis distincta mendozana Torre & Bartsch, 1972
distorta, Tetrentodon distorta Torre & Bartsch, 1972
dohrni, Amphicosmia dohrni (Maltzan, 1888)
dohrniana, Anoma dohrniana (Pfeiffer)
dolorensis, Centralia turgida dolorensis Torre & Bartsch
dolores, Liocallonia dolores Torre & Bartsch, 1972
doloresensis, Centralia turgida doloresensis Torre & Bartsch
dolorisensis, Tomelasmus acus dolorisensis Torre & Bartsch
dorotheae, Torrecoptis dorotheae Torre & Bartsch, 1972
dossierraensis, Cochlodinella dossierraensis Torre & Bartsch, 1972
dossierrasensis, Cochlodinella dossierrasensis (Torre & Bartsch, 1972)
dubia, Urocoptis dubia (Chitty, 1853)
dubia, Brachypodella dubia (Pilsbry, 1891)
dulcis, Microceramus dulcis Torre & Bartsch, 1972
dunkeri, Spirostemma dunkeri (Pfeiffer)
dunkeriana, Cylindrella dunkeriana Pfeiffer - syn of: Spirostemma dunkeri (Pfeiffer)
durangoensis, Haplocion durangoensis Bartsch, 1906
eburnea, Holospira eburnea Thompson & Mihalcik, 2005
eclipes, Coelostemma eclipes Thompson, 1971
edwardsianum, Resupinata edwardsianum (Crosse & Fischer, 1872)
eiseni, Coelocentrum eiseni Bartsch, 1907 - syn of: Spartocentrum eisenianum (Pilsbry, 1900)
eisenianum, Spartocentrum eisenianum (Pilsbry, 1900)
elatius, Spirostemma elatius (Adams, 1851)
electricola, Brachypodella electricola Torre & Bartsch, 1972
elegans, Macroceramus elegans (Gundlach, 1863)
elegans, Gongylostoma elegans (Pfeiffer, 1839)
elegans subelegans, Gongylostoma elegans subelegans (Pilsbry, 1903)
elizabethae, Coelostemma elizabethae (Pilsbry, 1889)
elizabethae, Badiofaux elizabethae Torre & Bartsch, 1972
elizaldensis, Tetrentodon elizaldensis Torre & Bartsch, 1972
ellioti, Gongylostoma ellioti Poey, 1858 - syn of: Gongylostoma elliotti (Poey, 1858)
elliotti, Gongylostoma elliotti (Poey, 1858)
elongata, Apoma elongata Beck, 1837 - syn of: Apoma chemnitzianum (Férussac, 1821)
elongatula, Brachypodella elongatula Torre & Bartsch, 1972
emerita, Brachypodella emerita Spence, 1927
emilii, Tetrentodon emilii Torre & Bartsch, 1972
empalmensis, Tetrentodon empalmensis Torre & Bartsch, 1972
encinarensis, Ventricochis atropurpurea encinarensis Torre & Bartsch
endolophus, Ptychodonta endolophus Pilsbry, 1953
erratica, Brachypodella erratica Pilsbry, 1930
estefaniae, Coelocentrum arctispira estefaniae Pilsbry
euclasta, Acrocoptis euclasta Torre & Bartsch, 1972
euclatus, Microceramus euclatus Torre & Bartsch, 1972
eurybia, Bostrichocentrum eurybia Bartsch, 1926
eustriata, Torrecoptis eustriata Torre & Bartsch, 1972
evanescens, Torrecoptis evanescens Torre & Bartsch, 1972
excelso, Pycnoptychia humboldtii excelso Torre & Bartsch
exilis, Torrecoptis bacillaris exilis Torre
exlex, Elasmocentrum exlex Pilsbry, 1902
exquisita, Torrecoptis barbouri exquisita Clench
fabreana, Pycnoptychia oviedoiana fabreana Poey
fallax, Trilamellaxis fallax (Torre, 1911)
fallax, Paracallonia albocrenata fallax Torre & Bartsch
fastigiata, Idiostemma fastigiata Pfeiffer
fastigiosa, Pleurostemma perplicata fastigiosa Torre & Bartsch
fergusoni, Holospira fergusoni Gilbertson & Naranjo-Garcia, 2010
ferminaensis, Poeycoptis lituus ferminaensis Torre & Bartsch
ferrissi, Holospira ferrissi Pilsbry, 1905
ferrissi fossor, Holospira ferrissi fossor Pilsbry & Ferriss, 1915
festus, Macroceramus festus Gundlach, 1859
filicosta, Gymnocentrum filicosta (Shuttleworth, 1852)
filiola, Tetrentodon filiola Torre & Bartsch, 1972
fischeri, Resupinata speciosum fischeri Von Martens
fistulare, Coelocentrum fistulare (Morelet, 1849)
flexuosa, Anoma flexuosa Pfeiffer, 1866
florenciana, Acrocoptis florenciana (Pilsbry, 1929)
florencianus, Microceramus florencianus Pilsbry, 1930
floridanus, Microceramus floridanus Pilsbry, 1898
fogonensis, Microceramus fogonensis Torre & Bartsch, 1972
fontei, Tomelasmus julii fontei Torre & Bartsch
fontesi julii, Tomelasmus fontesi julii Torre & Bartsch, 1972 - syn of: Tomelasmus julii Torre & Bartsch, 1972
formosus, Macroceramus formosus Wood, 1828
fornax, Styloptyx fornax Thompson, 1971
fornax ix, Styloptyx fornax ix Thompson, 1971
forticostata, Sonoraloa remondii forticostata Pilsbry
fortis, Gongylostomella fortis (Gundlach, 1864)
fortis, Torrecoptis vermicularis fortis Torre & Bartsch
fortisculpta, Holospira fortisculpta Thompson & Mihalcik, 2005
fortiuscula, Torrecoptis fortiuscula (Torre, 1912)
fossor, Holospira ferrissi fossor Pilsbry & Ferriss
franciscanus, Tomelasmus adnatus franciscanus Torre & Bartsch
fraterna, Capillacea capillacea fraterna Pilsbry
frederici, Brachypodella frederici Torre & Bartsch, 1972
freytagi, Goniapex freytagi (Bartsch, 1950)
fulva, Centralia fulva (Torre, 1911)
fumosa, Pfeiffericoptis fumosa (Gundlach, 1863)
fusca, Coelostemma fusca (Von Martens, 1897)
fuscolabris, Anoma fuscolabris (Chitty)
fuscolabris pilsbryi, Anoma fuscolabris pilsbryi Sykes - syn of: Anoma fuscolabris (Chitty)
fuscula, Torrecoptis reticostata fuscula Torre
fuscula, Torrecoptis fuscula Torre & Bartsch, 1972
fusiformis, Organocoptis fusiformis (Wright, 1863)
fusula, Tetrentodon fusula (Torre, 1929)
galalonensis, Organocoptis galalonensis Torre & Bartsch, 1972
galathea, Bostrichocentrum galathea Bartsch, 1926
galonensis, Liocallonia volubilis galonensis Torre & Bartsch
garciana, Pfeiffericoptis garciana (Wright, 1864)
garcianus, Macroceramus garcianus Torre & Bartsch, 1972
gealei, Bostrichocentrum gealei (Adams, 1872)
geminata, Pleurostemma geminata (Gundlach, 1870)
geminata nipensis, Pleurostemma geminata nipensis Torre & Bartsch, 1972
geminata regia, Pleurostemma geminata regia Torre & Bartsch, 1972
gemmata, Gongylostoma gemmata (Pilsbry, 1927)
gertrudis, Microceramus gertrudis Torre & Bartsch, 1972
gheisbreghti, Cylindrella gheisbreghti Pfeiffer, 1856 - syn of: Eucalodium decollatum (Nyst, 1841)
gibbonsi, Brachypodella gibbonsi Baker, 1924
giganteus, Macroceramus giganteus Sánchez Roig
gigas, Coelocentrum gigas Von Martens, 1897
goldfussi, Holospira goldfussi (Menke, 1847)
goldmani, Bostrichocentrum goldmani Bartsch, 1906
goniostoma, Holospira goniostoma (Pfeiffer, 1856)
gonzalensi, Uncinicoptis hidalgoi gonzalensi Pilsbry
gonzalezi, Urocoptis gonzalezi Pilsbry, 1903
goodrichi, Torrecoptis goodrichi Torre & Bartsch, 1972
goseei, Microceramus goseei Pfeiffer, 1846 - syn of: Microceramus gossei (Pfeiffer, 1846)
gossei, Anoma gossei (Pfeiffer, 1846)
gossei, Microceramus gossei (Pfeiffer, 1846)
gracile, Apoma gracile (Wood, 1828)
gracile, Coelostemma gracile Thompson & Mihalcik, 2011
gracilior, Gyraxis gracilior Torre & Bartsch, 1972
gracilis, Anoma gracilis (Adams, 1851)
gracillima, Tetrentodon gracillima (Poey, 1853)
gracillima callida, Tetrentodon gracillima callida Torre & Bartsch, 1972
grande, Oligostylus grande (Pfeiffer, 1860)
gravesii, Urocoptis gravesii (Adams, 1849)
gravidula, Tetrentodon gravidula Torre & Bartsch, 1972
gravidula chorrillensis, Tetrentodon gravidula chorrillensis Jaume & Torre, 1976
greenfieldi, Macroceramus vanattai greenfieldi Torre & Bartsch
greenfieldi, Torrecoptis occulta greenfieldi Torre & Bartsch
greggi, Haplocion greggi (Drake, 1951)
grillensis, Tetrentodon grillensis Torre & Bartsch, 1972
grobei, Macroceramus grobei Pfeiffer, 1862
grossior, Cochlodinella grossior Torre & Bartsch, 1972
gruneri, Autocoptis gruneri (Dunker, 1844)
guaicanamarensis, Heterocoptis guaicanamarensis Torre & Bartsch, 1972
guajabanaensis, Trilamellaxis parallela guajabanaensis Torre & Bartsch
guajacoensis, Centralia turgida guajacoensis Torre & Bartsch
guajenensis, Torrecoptis guajenensis Torre & Bartsch, 1972
guajenensis obsoleta, Torrecoptis guajenensis obsoleta Torre & Bartsch, 1972
guamaensis, Tomelasmus adnatus guamaensis Torre & Bartsch
guamaensis, Uncinicoptis hidalgoi guamaensis Torre & Bartsch
guamaensis, Capillacea angustior guamaensis Torre & Bartsch
guanaboensis, Tetrentodon guanaboensis Torre & Bartsch, 1972
guanensis, Microceramus nigropictus guanensis Torre & Bartsch
guanicanus, Microceramus guanicanus Baker, 1941
guantanamensis, Arangia guantanamensis Torre & Bartsch, 1972
guatemalensis, Eucalodium decollatum guatemalensis Bartsch
guatemalensis, Coelocentrum pittieri guatemalensis Bartsch
guaymasensis, Allocoryphe guaymasensis (Bartsch, 1943)
guigouana, Autocoptis guigouana (Petit De La Saussaye, 1859)
guigouana strohmi, Autocoptis guigouana strohmi (Petit De La Saussaye, 1859)
guildingi, Macroceramus guildingi (Pfeiffer)
guirensis, Urocoptis guirensis (Gundlach, 1863)
guirensis, Liocallonia guirensis (Gundlach, 1876)
guitarti, Torrecoptis longa guitarti Torre & Bartsch
guitarti, Heterocoptis guitarti Torre & Bartsch, 1972
gundlachi, Macroceramus gundlachi (Pfeiffer, 1852)
gundlachi, Arangia gundlachi Torre & Bartsch, 1972
gundlachiana, Tetrentodon gundlachiana (Poey, 1856)
gutierrezi, Badiofaux gutierrezi (Arango, 1876)
hadromylla, Trachycion hadromylla Thompson, 1968
haitiensis, Archegocoptis haitiensis Clench, 1936
hamiltoni, Haplocion hamiltoni (Dall, 1897)
handi, Nodulia handi (Torre, 1927)
handi cubicularia, Nodulia handi cubicularia Torre & Bartsch, 1972
hanleyana, Brachypodella hanleyana (Pfeiffer)
haploplax, Holospira haploplax Thompson & Mihalcik, 2005
havanensis, Microceramus havanensis Torre & Bartsch, 1972
hazelae, Coelostemma hazelae Pilsbry, 1953
hegewischi, Oligostylus hegewischi (Bartsch, 1947)
hendersoni, Orienticoptis hendersoni Torre & Bartsch, 1972
hendersoni, Microceramus hendersoni Torre & Bartsch, 2008
hendersoni, Macroceramus hendersoni Torre, 1909
henryi, Dissotropis henryi (Solem, 1957)
hermanni, Macroceramus hermanni (Pfeiffer, 1854)
herrerae, Coelostemma herrerae (Bartsch, 1906)
hesperius, Tomelasmus hesperius Torre & Bartsch, 1972
hesperius barrerai, Tomelasmus hesperius barrerai Torre & Bartsch, 1972
hesperius isabella, Tomelasmus hesperius isabella Torre & Bartsch, 1972
heterosculpta, Gongylostoma heterosculpta (Torre, 1932)
heynemanni, Uncinicoptis heynemanni (Pfeiffer, 1865)
hicacoensis, Microceramus hicacoensis Torre & Bartsch, 1972
hidalgoensis, Bostrichocentrum hidalgoensis Bartsch, 1906
hidalgoi, Uncinicoptis hidalgoi (Arango, 1879)
hidalgoi cabrasensis, Uncinicoptis hidalgoi cabrasensis (Pilsbry & Henderson)
hidalgoi gonzalensi, Uncinicoptis hidalgoi gonzalensi (Pilsbry, 1903)
hidalgoi guamaensis, Uncinicoptis hidalgoi guamaensis Torre & Bartsch, 1972
hilleiana, Gongylostoma hilleiana (Gundlach, 1880)
hilleiana crassiuscula, Gongylostoma hilleiana crassiuscula Torre & Bartsch, 1972
hilleri, Gongylostomella hilleri (Pfeiffer, 1862)
hilleri bucuyensis, Gongylostomella hilleri bucuyensis Torre & Bartsch, 1972
hilleri purialitoensis, Gongylostomella hilleri purialitoensis Torre & Bartsch, 1972
hilleri rex, Gongylostomella hilleri rex Torre & Bartsch, 1972
hinkleyi, Holospira hinkleyi Pilsbry, 1907
hinkleyi, Crossostephanus hinkleyi Pilsbry, 1909
hippocastaneum, Oligostylus hippocastaneum Dall, 1897
hoffmani, Millerspira hoffmani (Gilbertson & Naranjo-Garcia, 1998)
hogeana, Holospira hogeana Von Martens, 1897
holguinensis, Torrecoptis holguinensis (Aguayo, 1934)
hollandi, Bactrocoptis hollandi (Adams, 1850)
hubbardi, Callocoptis hubbardi Torre & Bartsch, 1972
huertai, Coelocentrum huertai Bartsch, 1947
hugesi, Planostemma intusfalcata hugesi Torre & Bartsch
humboldtiana, Pycnoptychia humboldtiana Pfeiffer, 1840 - syn of: Pycnoptychia humboldtii (Pfeiffer, 1840)
humboldtii, Pycnoptychia humboldtii (Pfeiffer, 1840)
humboldtii celsa, Pycnoptychia humboldtii celsa Torre & Bartsch, 1972
humboldtii cisnerosi, Pycnoptychia humboldtii cisnerosi Torre & Bartsch, 1972
humboldtii excelso, Pycnoptychia humboldtii excelso Torre & Bartsch, 1972
humboldtii johnsoni, Pycnoptychia humboldtii johnsoni Torre & Bartsch, 1972
humboldtii magna, Pycnoptychia humboldtii magna Torre & Bartsch, 1972
humilis, Simplicervix humilis (Adams, 1850)
hunbardi, Urocoptis hunbardi Torre
hyalina, Cylindrella hyalina Pfeiffer, 1847 - syn of: Anisospira liebmanni (Pfeiffer, 1846)
hydeana, Cylindrella hydeana Adams, 1849 - syn of: Microceramus gossei (Pfeiffer, 1846)
hydrophana, Bactrocoptis hydrophana (Chitty, 1853)
hyperia, Holospira hyperia Bartsch, 1926
illamellata, Cochlodinella illamellata (Wright, 1864)
imbricata, Holospira imbricata Von Martens, 1863
imiasensis, Macroceramus clerchi imiasensis Torre & Bartsch
imparata, Bialasmus imparata (Arango, 1882)
inaudita, Gongylostomella inaudita Torre & Bartsch, 1972
incerta, Poecilocoptis incerta (Arango, 1881)
inermis, Macroceramus inermis Gundlach, 1858
infanta, Holospira infanta Bartsch, 1906
infernalis, Tomelasmus irroratus infernalis Torre & Bartsch
infirmus, Microceramus bermudezi infirmus Torre & Bartsch
inflata, Tetrentodon inflata Torre & Bartsch, 1972
infortunata, Liocallonia infortunata (Arango, 1882)
infortunata debilis, Liocallonia infortunata debilis Torre & Bartsch, 1972
infortunata parva, Liocallonia infortunata parva Torre & Bartsch, 1972
infradenticulatus, Microceramus infradenticulatus (Wright, 1864)
innata, Urocoptis innata (Weinland)
inornata, Simplicervix inornata (Adams, 1849)
insigne, Oligostylus insigne (Crosse & Fischer, 1872)
instabilis, Urocoptis instabilis Vendryes, 1901
insuflata, Tetrentodon insuflata Torre & Bartsch, 1972
insulana, Pfeiffericoptis insulana Torre & Bartsch, 1972
insulare, Spartocentrum insulare Hanna, 1923
integra, Organocoptis integra (Pfeiffer, 1856)
integra signae, Organocoptis integra signae Torre & Bartsch, 1972
integra silvicola, Organocoptis integra silvicola Torre & Bartsch, 1972
intermedia, Centralia intermedia (Torre, 1911)
interrogationis, Macroceramus interrogationis Torre & Bartsch, 1972
interrupta, Idiostemma interrupta (Gundlach, 1857)
intuscoarctata, Centralia intuscoarctata (Torre, 1911)
intusfalcata, Planostemma intusfalcata (Torre & Ramsden, 1909)
intusfalcata hugesi, Planostemma intusfalcata hugesi Torre & Bartsch, 1972
intusmalleata, Pleurostemma intusmalleata (Gundlach, 1855)
intusmalleata crassa, Pleurostemma intusmalleata crassa Torre & Bartsch, 1972
inusitatum, Spirostemma inusitatum Vendryes, 1901
ipswichense, Spirostemma ipswichense Pilsbry, 1903
iqualaensis, Coelostemma iqualaensis (Bartsch, 1926)
irregularis, Spartocentrum irregularis (Gabb, 1868)
irregularis clavigeroi, Spartocentrum irregularis clavigeroi (Hanna, 1923)
irroratus, Tomelasmus irroratus (Gundlach, 1856)
irroratus abraensis, Tomelasmus irroratus abraensis Torre & Bartsch, 1972
irroratus caimitensis, Tomelasmus irroratus caimitensis Torre & Bartsch, 1972
irroratus infernalis, Tomelasmus irroratus infernalis Torre & Bartsch, 1972
irroratus maceoi, Tomelasmus irroratus maceoi Torre & Bartsch, 1972
irroratus saccharinus, Tomelasmus irroratus saccharinus Torre & Bartsch, 1972
irroratus similimus, Tomelasmus irroratus similimus Torre & Bartsch, 1972
irroratus sparsus, Tomelasmus irroratus sparsus Torre & Bartsch, 1972
irroratus tacoensis, Tomelasmus irroratus tacoensis Torre & Bartsch, 1972
isabella, Tomelasmus hesperius isabella Torre & Bartsch
ischna, Tetrentodon ischna (Pilsbry, 1903)
ischna, Gongylostoma ischna Pilsbry, 1903 - syn of: Tetrentodon ischna (Pilsbry, 1903)
ischnostele, Resupinata ischnostele (Pilsbry, 1909)
islandicus, Microceramus islandicus Torre & Bartsch, 1972
itineralis, Tetrentodon itineralis Torre & Bartsch, 1972 - syn of: Tetrentodon itineraris Torre & Bartsch, 1972
itineraris, Tetrentodon itineraris Torre & Bartsch, 1972
itineris, Liocallonia itineris Torre & Bartsch, 1972
ix, Styloptyx fornax ix Thompson
jaguaensis, Liocallonia jaguaensis Torre & Bartsch, 1972
jarucoensis, Tetrentodon jarucoensis Torre & Bartsch, 1972
jarvisi, Anoma jarvisi Pilsbry, 1903
jaucosensis, Macroceramus clerchi jaucosensis Sánchez Roig
jaumei, Tetrentodon jaumei Herrera-Uria & Espinosa, 2016
jaumei, Macroceramus jaumei Sánchez Roig, 1948
jaumei, Jaumea jaumei Torre & Bartsch, 1972
jeannereti, Macroceramus jeannereti Gundlach, 1858
jiminis, Cochlodinella jiminis Torre & Bartsch, 1972
joaquini, Uncinicoptis joaquini (Pilsbry, 1903)
johani, Arangia johani Torre & Bartsch, 1972
johnsoni, Pycnoptychia humboldtii johnsoni Torre & Bartsch
jovai, Heterocoptis jovai Torre & Bartsch, 1972
juliae, Autocoptis juliae (Clench, 1935)
julii, Tomelasmus julii Torre & Bartsch, 1972
julii chorrerensis, Tomelasmus julii chorrerensis Torre & Bartsch, 1972 - syn of: Tomelasmus chorrerensis Torre & Bartsch, 1972
julii fontei, Tomelasmus julii fontei Torre & Bartsch, 1972
jumaguaensis, Cochlodinella jumaguaensis Torre & Bartsch, 1972
jumaguasensis, Torrecoptis mameyensis jumaguasensis Torre & Bartsch
jungalitensis, Centralia jungalitensis Torre & Bartsch, 1972
kieneri, Microceramus kieneri (Pfeiffer, 1846)
kinonis, Sonoraloa kinonis (Baily & Baily, 1940)
klatteanus, Macroceramus klatteanus (Bland, 1875)
kraussiana, Brachypodella kraussiana (Weinland, 1876)
kriegeri, Holospira kriegeri Drake, 1950
lactaria, Gongylostoma lactaria (Gould, 1848)
lacteoflua, Cochlodinella lacteoflua (Pilsbry, 1903)
laevigata, Planostemma laevigata (Gundlach, 1859)
laevior, Sonoraloa remondii laevior Pilsbry
laevissima, Holospira pedroana laevissima Pilsbry
lagunillensis, Poecilocoptis lagunillensis (Pilsbry, 1903)
lajasensis, Tetrentodon lajasensis Torre & Bartsch, 1972
lajoncheri, Torrecoptis lajoncheri (Arango, 1884)
lamellata, Sonoraloa dentaxis lamellata Pilsbry
lata, Cylindrella lata Adams - syn of: Urocoptis producta (Gundlach)
lata antonionis, Spirocoptis lata antonionis Pilsbry - syn of: Urocoptis producta (Gundlach)
lata ischnostele, Spirocoptis lata ischnostele Pilsbry - syn of: Urocoptis producta (Gundlach)
lata manchionealensis, Spirocoptis lata manchionealensis Pilsbry - syn of: Urocoptis producta (Gundlach)
lateralis, Tenuistemma lateralis (Paz, 1860)
laterradii, Strophina laterradii (Grateloup, 1840)
latus, Microceramus latus (Gundlach, 1863)
laureani, Ventricochis laureani Torre & Bartsch, 1972
laureanus, Microceramus laureanus Torre & Bartsch, 1972
lavalleanus, Tomelasmus lavalleanus (D'Orbigny, 1842)
leonensis, Liocallonia patruelis leonensis Torre & Bartsch
leoni, Nesocoptis leoni Torre & Bartsch, 1972
leptus, Microceramus leptus Torre & Bartsch, 1972
lermondi, Tetrentodon lermondi Torre & Bartsch, 1972
lescaensis, Johaniceramus longus lescaensis Torre & Bartsch
lescallei, Brachypodella lescallei Torre & Bartsch, 1972
leucopleura, Brachypodella leucopleura (Menke, 1847)
leucostoma, Coelostemma leucostoma Thompson, 1971
levis, Anoma levis Adams, 1851
levis balteata, Anoma levis balteata Pilsbry, 1903 - syn of: Anoma levis Adams, 1851
libanoensis, Brachypodella libanoensis Torre & Bartsch, 1972
lichenophora, Coelostemma lichenophora (Bartsch, 1906)
liebmanni, Anisospira liebmanni (Pfeiffer, 1846)
limonarensis, Tetrentodon limonarensis Torre & Bartsch, 1972
limonensis, Tomelasmus torquatus limonensis Torre & Bartsch
limonesensis, Liocallonia volubilis limonesensis Torre & Bartsch
lineatus, Macroceramus lineatus (Bruguière, 1789)
lirata, Gongylostoma lirata (Jimeno, 1864)
lissocentrum, Coelostemma lissocentrum Pilsbry, 1953
litteratus, Macroceramus pictus litteratus Pfeiffer
lituus, Poeycoptis lituus (Gould, 1842)
lituus ferminaensis, Poeycoptis lituus ferminaensis Torre & Bartsch, 1972
lituus manni, Poeycoptis lituus manni Torre & Bartsch, 1972
lituus pfeifferi, Poeycoptis lituus pfeifferi Torre & Bartsch, 1972
lituus stearnsi, Poeycoptis lituus stearnsi (Gundlach, 1878)
livida, Torrecoptis livida (Torre, 1912)
livida maraguanensis, Torrecoptis livida maraguanensis Torre & Bartsch, 1972
livida piedrasensis, Torrecoptis livida piedrasensis Torre & Bartsch, 1972
livida solaensis, Torrecoptis livida solaensis Torre & Bartsch, 1972
livida solasensis, Torrecoptis livida solasensis Torre & Bartsch, 1972
livida tesicoensis, Torrecoptis livida tesicoensis Torre & Bartsch, 1972
loeryi, Macroceramus loeryi Jacobson, 1955
longa, Torrecoptis longa (Pilsbry & Henderson, 1913)
longa guitarti, Torrecoptis longa guitarti Torre & Bartsch, 1972
longus, Johaniceramus longus (Henderson, 1915)
longus borjeensis, Johaniceramus longus borjeensis Torre & Bartsch, 1972
longus lescaensis, Johaniceramus longus lescaensis Torre & Bartsch, 1972
longus santacruzensis, Johaniceramus longus santacruzensis Torre & Bartsch, 1972
lowei, Gongylostoma lowei (Torre, 1927)
lucens, Pfeiffericoptis lucens (Wright, 1875)
ludersi, Cylindrella ludersi Pfeiffer, 1859
ludovici, Macroceramus ludovici (Pfeiffer, 1853)
lux, Hendersoniella lux Thompson & Correa-Sandoval, 1994
lux chonomphix, Hendersoniella lux chonomphix Thompson & Correa-Sandoval, 1994
maceoi, Tomelasmus irroratus maceoi Torre & Bartsch
machoi, Pfeiffericoptis machoi (Arango, 1876)
macra, Poecilocoptis macra (Wright, 1867)
macrostoma, Cylindrella macrostoma Pfeiffer, 1857 - syn of: Anoma striata (Adams, 1851)
maculatus, Microceramus maculatus (Gundlach, 1865)
maculosa, Torrecoptis occulta maculosa Torre & Bartsch
madrugaensis, Tetrentodon madrugaensis Torre & Bartsch, 1972
magna, Pycnoptychia humboldtii magna Torre & Bartsch
maguirrensis, Torrecoptis bacillaris maguirrensis Torre & Bartsch
maisiensis, Pleurostemma perplicata maisiensis Torre & Bartsch
major, Eucalodium mexicanum major Fischer & Crosse
majuscula, Nesocoptis majuscula Torre & Bartsch, 1972
mameyensis, Torrecoptis mameyensis Torre & Bartsch, 1972
mameyensis jumaguasensis, Torrecoptis mameyensis jumaguasensis Torre & Bartsch, 1972
mandevillense, Spirostemma mandevillense Pilsbry & Brown, 1910
manni, Poeycoptis lituus manni Torre & Bartsch
manzanillensis, Cochlodinella manzanillensis (Torre, 1930)
maraguanensis, Torrecoptis livida maraguanensis Torre & Bartsch
maraguanensis, Torrecoptis maraguanensis Torre & Bartsch, 1972
mariae, Oligostylus mariae (Bartsch, 1947)
mariae, Haplocion mariae Bartsch, 1942
marianum, Ptychocentrum marianum (Bartsch, 1943)
marmorata, Tetrentodon marmorata (Shuttleworth, 1852)
marmoratus, Microceramus marmoratus Torre & Bartsch, 1972
marrsi, Coelostemma marrsi Drake, 1951 - syn of: Goniapex freytagi (Bartsch, 1950)
martii, Tetrentodon martii Torre & Bartsch, 1972
martinensis, Torrecoptis martinensis Torre & Bartsch, 1972
martinezi, Cochlodinella martinezi Torre & Bartsch, 1972
martinezi, Centralia martinezi Torre & Bartsch, 1972
martinezi, Microceramus martinezi Torre & Bartsch, 1972
mathewsoni, Haplocion mathewsoni Bartsch, 1942
maugeri albida, Cylindrella maugeri albida Adams, 1851 - syn of: Anoma splendens (Menke, 1841)
maugeri bicincta, Cylindrella maugeri bicincta Adams, 1851 - syn of: Anoma levis Adams, 1851
maugeri bicolor, Cylindrella maugeri bicolor Chitty - syn of: Anoma alboanfractus (Chitty)
maugeri cinerea, Cylindrella maugeri cinerea Adams, 1851 - syn of: Anoma tesselata (Adams, 1851)
maugeri citrina, Cylindrella maugeri citrina Adams, 1851 - syn of: Anoma splendens (Menke, 1841)
maugeri concinna, Cylindrella maugeri concinna Adams, 1851 - syn of: Anoma levis Adams, 1851
maugeri conica, Cylindrella maugeri conica Adams, 1851 - syn of: Anoma solida (Adams, 1851)
maugeri corpulenta, Cylindrella maugeri corpulenta Adams, 1851 - syn of: Anoma striata (Adams, 1851)
maugeri crassa, Cylindrella maugeri crassa Adams, 1851 - syn of: Anoma nigrescens (Adams, 1851)
maugeri fusca, Cylindrella maugeri fusca Adams, 1851 - syn of: Anoma striata (Adams, 1851)
maugeri quadricolor, Cylindrella maugeri quadricolor Chitty, 1853 - syn of: Anoma nigrescens (Adams, 1851)
maugeri raphinina, Cylindrella maugeri raphinina Chitty, 1853 - syn of: Anoma tricolor Pfeiffer, 1852
maugeri rosealabris, Cylindrella maugeri rosealabris Chitty, 1853 - syn of: Anoma splendens (Menke, 1841)
maugeri rufilabris, Cylindrella maugeri rufilabris Adams, 1851 - syn of: Anoma nigrescens (Adams, 1851)
maugeri striatula, Cylindrella maugeri striatula Adams, 1851 - syn of: Anoma solida (Adams, 1851)
maugeri tricolor, Cylindrella maugeri tricolor Adams, 1851 - syn of: Anoma splendens (Menke, 1841)
maugeri unicincta, Cylindrella maugeri unicincta Adams, 1851 - syn of: Anoma levis Adams, 1851
maugeri unicolor, Cylindrella maugeri unicolor Adams, 1851 - syn of: Anoma solida (Adams, 1851)
maugeri valida, Cylindrella maugeri valida Adams, 1851 - syn of: Anoma solida (Adams, 1851)
maxwelli, Holospira maxwelli Pilsbry, 1953
mayajiguensis, Centralia mayajiguensis (Torre, 1911)
mayensis, Gongylostomella mayensis (Torre & Ramsden, 1915)
mazatlanica, Sonoraloa mazatlanica (Bartsch, 1943)
mediana, Cochlodinella mediana (Pilsbry, 1913)
megacheila, Urocoptis megacheila (Chitty, 1855)
melea, Holospira melea Bartsch, 1926
mellacea, Asthenocoptis mellacea Torre & Bartsch, 1972
mellita, Tetrentodon mellita (Torre, 1932)
menciae, Brachypodella menciae Torre & Bartsch, 1972
mendax, Goniapex mendax Thompson & Mihalcik, 2011
mendezi, Tetrentodon mendezi Torre & Bartsch, 1972
mendozana, Badiofaux mendozana (Pilsbry, 1928)
mendozana, Sagracoptis distincta mendozana Torre & Bartsch
mercedesensis, Torrecoptis mercedesensis (Pilsbry, 1930)
mesolia, Holospira mesolia Pilsbry, 1912
metcalfi, Holospira metcalfi Thompson, 1974
mexicana, Holospira mexicana Bartsch, 1906
mexicanum, Eucalodium mexicanum (Pfeiffer, 1860)
mexicanum major, Eucalodium mexicanum major Fischer & Crosse, 1873
mexicanum minor, Eucalodium mexicanum minor (Pfeiffer, 1860)
mexicanus, Microceramus mexicanus (Von Martens, 1897)
michaeli, Gongylostoma michaeli Torre & Bartsch, 1972
microdon, Macroceramus microdon (Pfeiffer, 1853)
microstoma, Coelostemma microstoma (Pfeiffer, 1861)
milleri, Millerspira milleri (Gilbertson, 1989)
millestriata, Holospira millestriata Pilsbry & Ferriss, 1915
minaensis, Tomelasmus coloratus minaensis Torre & Bartsch
minaensis, Torrecoptis minaensis Torre & Bartsch, 1972
minaensis, Liocallonia minaensis Torre & Bartsch, 1972
minasensis, Tetrentodon minasensis (Torre, 1929)
minima, Allocoryphe minima (Von Martens, 1897)
minima, Haplocion minima Bartsch, 1943 - syn of: Allocoryphe minima (Von Martens, 1897)
minima, Centralia concolor minima Torre & Bartsch
minimum, Resupinata speciosum minimum Von Martens
minor, Microceramus minor (Arango, 1866)
minor, Metastoma roemeri minor Cockerell
minor, Eucalodium mexicanum minor Pfeiffer
minor, Tomelasmus acus minor Torre & Bartsch
minorina, Spartocentrum minorina Mabille, 1895 - syn of: Spartocentrum irregularis (Gabb, 1868)
minorinum gabbi, Coelocentrum minorinum gabbi Pilsbry, 1900 - syn of: Spartocentrum irregularis (Gabb, 1868)
minuta, Brachypodella minuta (Gundlach, 1859)
miquihuanae, Hendersoniella miquihuanae Thompson & Correa-Sandoval, 2011
miraderensis, Tetrentodon miraderensis Torre & Bartsch, 1972 - syn of: Tetrentodon miraderoensis Torre & Bartsch, 1972
miraderoensis, Tetrentodon miraderoensis Torre & Bartsch, 1972
miranda, Planostemma miranda (Pilsbry, 1929)
mirandaensis, Gongylostomella turneri mirandaensis Torre & Bartsch
mitraensis, Holospira mitraensis Bartsch, 1926
mixta, Cochlodinella mixta (Wright, 1865)
mochensis, Tetrentodon mochensis Torre & Bartsch, 1972
modesta, Tetrentodon modesta (Poey, 1858)
modestus, Microceramus modestus Torre & Bartsch, 2008
modica, Brachypodella modica Torre & Bartsch, 1972
mogotensis, Badiofaux mogotensis Torre & Bartsch, 1972
mollita, Urocoptis mollita Pilsbry
monclovana, Holospira monclovana Bartsch, 1925
monelasmus, Badiofaux monelasmus (Pilsbry, 1928)
monilifera, Autocoptis monilifera (Pfeiffer, 1850)
montana, Cylindrella montana Adams, 1849 - syn of: Bactrocoptis rosea (Pfeiffer, 1844)
montanensis, Tetrentodon montanensis Torre & Bartsch, 1972
montanus, Microceramus bioscanus montanus Torre & Bartsch
montecristensis, Tetrentodon montecristensis Torre & Bartsch, 1972
montivaga, Holospira montivaga Pilsbry, 1946
montivaga brevaria, Holospira montivaga brevaria Pilsbry, 1946 - syn of: Holospira montivaga Pilsbry, 1946
monzarillensis, Cochlodinella monzarillensis Torre & Bartsch, 1972
monzarillesis, Cochlodinella monzarillesis Torre & Bartsch, 1972 - syn of: Cochlodinella monzarillensis Torre & Bartsch, 1972
moralesi, Pfeiffericoptis moralesi (Gundlach, 1876)
moreleti, Cylindrella moreleti Deshayes, 1851 - syn of: Coelocentrum tomacella (Morelet, 1849)
morelosensis, Holospira morelosensis Bartsch, 1947 - syn of: Holospira rehderi Bartsch, 1947
morenoi, Heterocoptis morenoi Torre & Bartsch, 1972
morini, Brachypodella morini (Morelet, 1849)
morini salpinx, Brachypodella morini salpinx (Tristram, 1861)
morini sargi, Brachypodella morini sargi (Von Martens, 1897)
mortei, Nesocoptis mortei Torre & Bartsch, 1972
mota, Microceramus mota Pilsbry, 1920
moussonianum, Oligostylus moussonianum (Crosse & Fischer, 1872)
mudoensis, Scalaricoptis mudoensis Torre & Bartsch, 1972
mulo, Ventricochis mulo Torre & Bartsch, 1972
multispiralis, Tenuistemma multispiralis (Sowerby, 1875)
muscatus, Macroceramus muscatus Torre & Bartsch, 1972
najasaensis, Heterocoptis najasaensis Torre & Bartsch, 1972
najazaensis, Heterocoptis najazaensis Torre & Bartsch, 1972 - syn of: Heterocoptis najasaensis Torre & Bartsch, 1972
nana, Ventricochis nana Torre & Bartsch, 1972
nana, Tetrentodon nana Torre & Bartsch, 1972
nataliae, Torrecoptis nataliae Torre & Bartsch, 1972
natensoni, Organocoptis natensoni Torre & Bartsch, 1972
nazarena, Pycnoptychia trina nazarena Torre & Bartsch
nazarenensis, Tetrentodon nazarenensis Torre & Bartsch, 1972
nazarenoensis, Tetrentodon nazarenoensis Torre & Bartsch, 1972 - syn of: Tetrentodon nazarenensis Torre & Bartsch, 1972
nebrius, Allocoptis nebrius Thompson & Franz, 1976
neglectum, Oligostylus neglectum (Crosse & Fischer, 1872)
nelsoni, Coelocentrum nelsoni Dall, 1910
nelsoni, Holospira nelsoni Pilsbry, 1902
newcombiana, Urocoptis newcombiana Gabb, 1868 - syn of: Berendtia taylori (Pfeiffer, 1861)
nidicostata, Brachypodella nidicostata Spence, 1920
nigrescens, Anoma nigrescens (Adams, 1851)
nigrescens leucostoma, Anoma nigrescens leucostoma Pilsbry, 1903 - syn of: Anoma nigrescens (Adams, 1851)
nigrescens levior, Anoma nigrescens levior Baker, 1935 - syn of: Anoma nigrescens (Adams, 1851)
nigropictus, Microceramus nigropictus (Gundlach, 1863)
nigropictus guanensis, Microceramus nigropictus guanensis Torre & Bartsch, 2008
nipensis, Pleurostemma geminata nipensis Torre & Bartsch
nipensis, Orienticoptis nipensis Torre & Bartsch, 1972
nitens, Anoma nitens Chitty, 1853
nitens simpsoni, Anoma nitens simpsoni Pilsbry, 1903 - syn of: Anoma nitens Chitty, 1853
nobilior, Urocoptis nobilior Adams, 1845
nodulifera, Nodulia nodulifera (Torre, 1929)
notata, Liocallonia notata (Gundlach, 1863)
notatus, Macroceramus notatus (Gundlach, 1859)
notogastor, Coelostemma notogastor Thompson, 1971
nubila, Poecilocoptis nubila (Poey, 1864)
oaxacana, Holospira oaxacana Bartsch, 1906
obesa, Urocoptis brevis obesa Adams
obesa, Urocoptis obesa Adams, 1845 - syn of: Urocoptis brevis obesa Adams, 1845
obesa densestriata, Urocoptis obesa densestriata Adams, 1845 - syn of: Urocoptis brevis obesa Adams, 1845
oblicua, Centralia oblicua (Pfeiffer, 1863)
oblita, Nodulia oblita Torre & Bartsch, 1972
obscura, Centralia obscura Torre & Bartsch, 1972
obsoleta, Torrecoptis guajenensis obsoleta Torre & Bartsch
ocana, Holospira ocana Bartsch, 1906
occidentalis, Cochlodinella variegata occidentalis Torre & Bartsch
occulta, Hendersoniella occulta (Say, 1831)
occulta, Torrecoptis occulta (Torre, 1912)
occulta greenfieldi, Torrecoptis occulta greenfieldi Torre & Bartsch, 1972
occulta maculosa, Torrecoptis occulta maculosa Torre & Bartsch, 1972
oleacea, Torrecoptis oleacea Torre & Bartsch, 1972
oligomesa, Liocallonia oligomesa (Pilsbry, 1903)
orcutti, Holospira orcutti Bartsch, 1925
orcutti, Anisospira orcutti Dall, 1910 - syn of: Anisospira liebmanni (Pfeiffer, 1846)
orientalis, Microceramus orientalis Aguayo, 1935
oritis, Holospira oritis Pilsbry & Cheatum, 1951
ornata, Septilumen ornata (Gundlach, 1859)
oropuchensis, Brachypodella oropuchensis Spence
otoides, Eucalodium otoides Thompson, 1968
ovata, Urocoptis ovata (Deshayes)
ovata sanctaeannae, Urocoptis ovata sanctaeannae Pilsbry - syn of: Urocoptis ovata (Deshayes)
oviedoiana, Pycnoptychia oviedoiana (D'Orbigny, 1842)
oviedoiana fabreana, Pycnoptychia oviedoiana fabreana (Poey, 1858)
oweni, Coelocentrum oweni Hanna, 1923 - syn of: Spartocentrum insulare Hanna, 1923
painteri, Holospira painteri Bartsch, 1906
paivana, Cylindrella paivana Pfeiffer - syn of: Anoma alboanfractus (Chitty)
paivanus, Microceramus paivanus (Pfeiffer, 1866)
palenquensis, Microceramus palenquensis (Gundlach, 1863)
palenquensis, Tetrentodon palenquensis Jaume & Torre, 1972
palenquensis, Trilamellaxis parallela palenquensis Torre & Bartsch
pallens, Nodulia vignalensis pallens Torre & Bartsch
pallida, Brachypodella pallida Pfeiffer, 1845
pallidula, Torrecoptis pallidula (Torre, 1912)
palmae, Liocallonia palmae (Gundlach, 1876)
palmarensis, Microceramus palmarensis Torre & Bartsch, 1972
palmeri, Hendersoniella palmeri (Dall, 1905)
palmeri, Holospira palmeri Bartsch, 1906
palmeri, Crossostephanus palmeri Dall & Bartsch, 1908
palmeri, Tetrentodon palmeri Torre & Bartsch, 1972
palmeri simplex, Hendersoniella palmeri simplex Pilsbry, 1953 - syn of: Hendersoniella palmeri (Dall, 1905)
parallela, Heterocoptis parallela (Torre, 1912)
parallela, Trilamellaxis parallela Torre & Bartsch, 1972
parallela culebrensis, Trilamellaxis parallela culebrensis Torre & Bartsch, 1972
parallela guajabanaensis, Trilamellaxis parallela guajabanaensis Torre & Bartsch, 1972
parallela palenquensis, Trilamellaxis parallela palenquensis Torre & Bartsch, 1972
parallela santarosana, Trilamellaxis parallela santarosana Torre & Bartsch, 1972
parallela zuluetensis, Trilamellaxis parallela zuluetensis Torre & Bartsch, 1972
parallelus, Macroceramus parallelus Arango, 1866
parva, Liocallonia infortunata parva Torre & Bartsch
parvula, Torrecoptis parvula Torre & Bartsch, 1972
pasonis, Haplocion pasonis (Dall, 1896)
patruelis, Liocallonia patruelis (Arango, 1876)
patruelis leonensis, Liocallonia patruelis leonensis Torre & Bartsch, 1972
patruelis soroaensis, Liocallonia patruelis soroaensis Torre & Bartsch, 1972
patruelis sotonensis, Liocallonia patruelis sotonensis Torre & Bartsch, 1972
paucicostata, Torrecoptis paucicostata Torre & Bartsch, 1972
paucicostata, Tetrentodon paucicostata Torre & Bartsch, 1972
paucinoda, Crossostephanus paucinoda Thompson & Correa-Sandoval, 1994
pazi, Macroceramus pazi Gundlach, 1858
pazi canapuensis, Macroceramus pazi canapuensis Torre & Bartsch, 2008
pearmanaeanum, Mychostoma pearmanaeanum (Chitty, 1853)
peccatrix, Gongylostoma peccatrix Torre & Bartsch, 1972
peccatrix roberti, Gongylostoma peccatrix roberti Torre & Bartsch, 1972
peculiaris, Levistemma peculiaris Torre & Bartsch, 1972
pedroana, Holospira pedroana Bartsch, 1926
pedroana laevissima, Holospira pedroana laevissima Pilsbry, 1953
pelecostata, Cochlodinella pelecostata Torre & Bartsch, 1972
penion, Coelocentrum penion Thompson & Correa-Sandoval, 1994
peraffinis, Pycnoptychia peraffinis (Pilsbry, 1903)
perconicus, Microceramus petitianus perconicus Pilsbry
perconicus, Microceramus perconicus Pilsbry, 1904 - syn of: Microceramus petitianus perconicus (Pilsbry, 1904)
percostata, Torrecoptis percostata Torre & Bartsch, 1972
perdidoensis, Tetrentodon perdidoensis Torre & Bartsch, 1972
perdita, Tetrentodon perdita Torre & Bartsch, 1972
perezi, Tomelasmus thomsoni perezi Torre & Bartsch
perfecta, Arangia perfecta (Pilsbry, 1942)
perlata, Carcinostemma perlata (Gundlach, 1859)
perlonga, Tetrentodon perlonga (Torre, 1932)
perplexa, Bostrichocentrum perplexa Thompson, 1964
perplicata, Pleurostemma perplicata (Beck, 1837)
perplicata, Brachypodella perplicata (Férussac, 1838)
perplicata fastigiosa, Pleurostemma perplicata fastigiosa Torre & Bartsch, 1972
perplicata maisiensis, Pleurostemma perplicata maisiensis Torre & Bartsch, 1972
perplicata yunguensis, Pleurostemma perplicata yunguensis Torre & Bartsch, 1972
perpunctata, Urocoptis perpunctata Pilsbry, 1933
perpusilla, Pineria perpusilla (Wurtz, 1950)
petitianus, Microceramus petitianus (D'Orbigny, 1841)
petitianus perconicus, Microceramus petitianus perconicus (Pilsbry, 1904)
petri, Cochlodinella petri Torre & Bartsch, 1972
petrophila, Torrecoptis bacillaris petrophila Pilsbry
petrophilla, Torrecoptis bacillaris petrophilla Pilsbry
pfefferi, Coelocentrum pfefferi Dall, 1896
pfeifferi, Holospira pfeifferi (Menke, 1847)
pfeifferi, Poeycoptis lituus pfeifferi Torre & Bartsch
pfeifferi, Anoma pfeifferi Von Martens, 1860 - syn of: Anoma gossei (Pfeiffer, 1846)
pfeifferi minima, Holospira pfeifferi minima Von Martens, 1897 - syn of: Allocoryphe minima (Von Martens, 1897)
pfeifferi percostata, Holospira pfeifferi percostata Pilsbry, 1902 - syn of: Allocoryphe minima (Von Martens, 1897)
philippiana, Tetrentodon philippiana (Pfeiffer, 1845)
picta, Holospira picta Bartsch, 1925
picturatus, Macroceramus picturatus Torre & Bartsch, 1972
pictus, Macroceramus pictus Gundlach, 1858
pictus litteratus, Macroceramus pictus litteratus Pfeiffer, 1860
pictus reticulatus, Macroceramus pictus reticulatus Torre & Bartsch, 2008
piedrasensis, Torrecoptis livida piedrasensis Torre & Bartsch
pilocerei, Holospira pilocerei (Pfeiffer, 1841)
pilotensis, Planostemma pilotensis (Gundlach, 1862)
pilsbryana, Amphistemma pilsbryana (Ramsden, 1914)
pilsbryi, Spiroceramus pilsbryi Clench, 1967
pilsbryi, Bostrichocentrum pilsbryi Dall, 1895
pilsbryi, Anoma pilsbryi Sykes - syn of: Anoma fuscolabris (Chitty)
pilsbryi, Gongylostomella pilsbryi Torre & Bartsch, 1972
pilsbryi, Microceramus pilsbryi Torre & Bartsch, 1972
pinera, Cochlodinella pinera Herrera-Uria, Espinosa & Ortea, 2016
pipianensis, Gongylostoma pipianensis Torre & Bartsch, 1972
pipianensis, Tetrentodon pipianensis Torre & Bartsch, 1972
pipianensis, Microceramus pipianensis Torre & Bartsch, 1972
pirata, Cochlodinella pirata Herrera-Uria, Espinosa & Ortea, 2016
pittieri, Coelocentrum pittieri Bartsch, 1906
pittieri guatemalensis, Coelocentrum pittieri guatemalensis Bartsch, 1906
pityis, Holospira pityis Pilsbry & Cheatum, 1951
planospira, Gongylostoma planospira (Pfeiffer, 1855)
planospira cocaensis, Gongylostoma planospira cocaensis Torre & Bartsch, 1972
plicatum, Tetrentodon plicatum (Poey, 1856)
plumbea, Badiofaux plumbea (Wright, 1864)
poeyana, Cochlodinella poeyana (D'Orbigny, 1841)
poeyi, Tetrentodon poeyi Torre & Bartsch, 1972
polita, Torrecoptis polita Torre & Bartsch, 1972
politecnica, Holospira politecnica (Bartsch, 1945)
polystreptus, Macroceramus polystreptus Tristram, 1861 - syn of: Microceramus concisus (Morelet, 1849)
pontificus, Macroceramus pontificus Gould, 1848 - syn of: Microceramus mexicanus (Von Martens, 1897)
porrecta, Tetrentodon porrecta Torre & Bartsch, 1972
portalesensis, Organocoptis portalesensis Torre & Bartsch, 1972
portillensis, Cochlodinella portillensis Torre & Bartsch, 1972
portuondi, Urocoptis portuondi Torre, 1929 - syn of: Urocoptis portuondoi (Torre, 1929)
portuondoi, Urocoptis portuondoi (Torre, 1929)
portuondoi, Palenquecoptis portuondoi Torre & Bartsch, 1972
portuondoi, Microceramus portuondoi Torre & Bartsch, 1972
portuondoi, Tetrentodon portuondoi Torre & Bartsch, 1972
potamia, Sonoraloa dentaxis potamia Pilsbry
praeclara, Torrecoptis praeclara Torre & Bartsch, 1972
presasiana, Cochlodinella presasiana (Pfeiffer, 1866)
presidioensis, Coelostemma presidioensis Bartsch, 1943
prevali, Brachypodella prevali Torre & Bartsch, 1972
prevali yemenensis, Brachypodella prevali yemenensis Torre & Bartsch, 1972
prima, Nesocoptis prima (Arango, 1882)
princeps, Spirostemma princeps (Adams, 1851)
principensis, Cochlodinella principensis Torre & Bartsch, 1972
priosculpta, Crossostephanus priosculpta Thompson & Correa-Sandoval, 1994
procera, Urocoptis procera (Adams)
producta, Urocoptis producta (Gundlach)
propinqua, Liocallonia propinqua (Gundlach, 1882)
propinqua, Anoma propinqua Vendryes, 1901 - syn of: Spirostemma bellevuense Pilsbry, 1903
proteus, Trilamellaxis proteus (Torre, 1911)
proteus turgens, Trilamellaxis proteus turgens Torre & Bartsch, 1972
providentius, Microceramus providentius (Pilsbry, 1904)
proxima, Gongylostoma proxima Torre & Bartsch, 1972
pruinosa, Nesocoptis pruinosa (Morelet, 1849)
pruinosa bibijaguaensis, Nesocoptis pruinosa bibijaguaensis (Torre & Bartsch, 1972)
pruinosa bibijaguensis, Nesocoptis pruinosa bibijaguensis Torre & Bartsch, 1972
pruinosa caballoensis, Nesocoptis pruinosa caballoensis Torre & Bartsch, 1972
pruinosa casasensis, Nesocoptis pruinosa casasensis Torre & Bartsch, 1972
prunicolor, Anoma prunicolor Chitty, 1853
pulchella, Anoma pulchella (Chitty)
pulchella, Brachypodella subtilis pulchella Von Martens
pulchella, Gongylostoma pulchella Von Martens, 1886 - syn of: Brachypodella subtilis pulchella (Von Martens, 1886)
pulcherrima, Capillacea pulcherrima Torre & Bartsch, 1972
pulcherrima aurulenta, Capillacea pulcherrima aurulenta Torre & Bartsch, 1972
pulchra, Ventricochis pulchra Torre & Bartsch, 1972
pulla, Anoma pulla Chitty, 1853
puntillaensis, Microceramus puntillaensis Torre & Bartsch, 1972
puntillensis, Centralia concolor puntillensis Torre & Bartsch
pupa, Bostrichocentrum pupa Thompson, 1964
pupaeformis, Bactrocoptis pupaeformis (Adams, 1850)
pupoides, Macroceramus pupoides Pfeiffer, 1863
pupoides boqueronis, Macroceramus pupoides boqueronis Sánchez Roig
purialitoensis, Gongylostomella hilleri purialitoensis Torre & Bartsch
puriosensis, Torrecoptis puriosensis Torre & Bartsch, 1972
pusillum, Spirostemma pusillum (Adams, 1850)
pyrgonasta, Goniapex pyrgonasta Thompson, 1988
queretaroensis, Holospira queretaroensis (Bartsch, 1945)
radiata, Anoma radiata Chitty, 1853
ramirezi, Pycnoptychia amicorum ramirezi Torre & Bartsch
ramsdeni, Brachypodella ramsdeni Torre, 1914
raveni, Brachypodella raveni Crosse, 1872
realensis, Microceramus realensis Torre & Bartsch, 1972
rectaxis, Orienticoptis rectaxis (Pilsbry, 1930)
rectaxis sculpturata, Orienticoptis rectaxis sculpturata Pilsbry, 1929 - syn of: Orienticoptis sculpturata (Pilsbry, 1929)
recticosta, Trachycion recticosta (Pfeiffer, 1847)
recticosta townsendi, Trachycion recticosta townsendi (Pilsbry & Cockerell, 1903)
recticostata, Torrecoptis recticostata Torre & Bartsch, 1972
regia, Pleurostemma geminata regia Torre & Bartsch
regia, Cochlodinella regia Torre & Bartsch, 1972 - syn of: Orienticoptis regis Torre & Bartsch, 1972
regis, Holospira regis Pilsbry & Cockerell, 1905
regis, Macroceramus regis Pilsbry, 1930
regis, Gongylostomella regis Torre & Bartsch, 1972
regis, Orienticoptis regis Torre & Bartsch, 1972
rehderi, Holospira rehderi Bartsch, 1947
reiteri, Goniapex reiteri (Drake, 1951)
remediensis, Trilamellaxis remediensis (Torre, 1911)
remediensis cuetoi, Trilamellaxis remediensis cuetoi Torre & Bartsch, 1972
remedioensis, Microceramus remedioensis Torre & Bartsch, 1972
remondii, Sonoraloa remondii (Gabb, 1865)
remondii forticostata, Sonoraloa remondii forticostata (Pilsbry, 1953)
remondii laevior, Sonoraloa remondii laevior (Pilsbry, 1953)
remondii yaquensis, Sonoraloa remondii yaquensis (Pilsbry, 1953)
remota, Organocoptis remota (Arango, 1880)
remoticostata, Torrecoptis remoticostata Torre & Bartsch, 1972
reticostata, Torrecoptis reticostata (Torre, 1929)
reticostata fuscula, Torrecoptis reticostata fuscula (Torre, 1929)
reticulatus, Macroceramus pictus reticulatus Torre & Bartsch
rex, Gongylostomella hilleri rex Torre & Bartsch
rhinion, Holospira rhinion Thompson & Mihalcik, 2005
richardi, Coelostemma richardi Thompson, 1971
riisei, Brachypodella riisei Pfeiffer, 1852
rinconadensis, Liocallonia canaletensis rinconadensis Torre & Bartsch
rinconadensis, Ventricochis atropurpurea rinconadensis Torre & Bartsch
rinconensis, Torrecoptis rinconensis Torre & Bartsch, 1972
riograndense, Metastoma riograndense Pilsbry, 1946 - syn of: Holospira riograndensis Pilsbry, 1946
riograndensis, Holospira riograndensis Pilsbry, 1946
ritae, Tetrentodon ritae Torre & Bartsch, 1972
ritana, Tetrentodon ritana Torre & Bartsch, 1972
riveroni, Torrecoptis riveroni Torre & Bartsch, 1972
roberti, Gongylostoma peccatrix roberti Torre & Bartsch
robertsi, Geoscala robertsi (Adams, 1851)
robusta, Sagracoptis robusta Torre & Bartsch, 1972
robusta caimitensis, Sagracoptis robusta caimitensis Torre & Bartsch, 1972
rocai, Geminicoptis rocai (Torre, 1929)
roemeri, Metastoma roemeri (Pfeiffer, 1848)
roemeri minor, Metastoma roemeri minor Cockerell, 1898
ronzoni, Bostrichocentrum ronzoni Bartsch, 1943
rosaperdita, Acrocoptis rosaperdita Torre & Bartsch, 1972
rosariensis, Cochlodinella variegata rosariensis Torre & Bartsch
rosea, Bactrocoptis rosea (Pfeiffer, 1844)
rosea fortis, Cylindrella rosea fortis Adams, 1851 - syn of: Urocoptis ambigua (Adams, 1849)
rosea magna, Cylindrella rosea magna Adams, 1849 - syn of: Urocoptis ambigua (Adams, 1849)
rosea major, Cylindrella rosea major Adams, 1849 - syn of: Urocoptis ambigua (Adams, 1849)
rotundibasis, Macroceramus rotundibasis Pilsbry, 1913
rubiola, Heterocoptis rubiola Torre & Bartsch, 1972
rubra, Cylindrella rubra Adams - syn of: Spirostemma dunkeri (Pfeiffer)
rufescens, Torrecoptis rufescens Torre & Bartsch, 1972
rufescens, Coelocentrum tomacella rufescens Von Martens
rufus, Microceramus rufus Torre & Bartsch, 1972
rugeli, Tetrentodon rugeli Shuttleworth, 1852 - syn of: Tetrentodon rugelli (Shuttleworth, 1852)
rugelli, Tetrentodon rugelli (Shuttleworth, 1852)
saccharinus, Tomelasmus irroratus saccharinus Torre & Bartsch
sagraiana, Pfeiffericoptis sagraiana (Pfeiffer, 1840)
saguaensis, Cochlodinella saguaensis Torre & Bartsch, 1972
salleana, Amphicosmia salleana (Pfeiffer, 1850)
salleanus, Microceramus signatus salleanus Pilsbry
salleanus, Microceramus salleanus Pilsbry, 1903 - syn of: Microceramus signatus salleanus Pilsbry, 1903
salpinx, Apertaxis salpinx Thompson & Mihalcik, 2011
salpinx, Brachypodella morini salpinx Tristram
salpinx, Cylindrella salpinx Tristram, 1861 - syn of: Brachypodella morini salpinx (Tristram, 1861)
saltillensis, Coelostemma saltillensis Pilsbry, 1953
salvatoris, Asthenocoptis salvatoris Torre & Bartsch, 1972
sanchezi, Heterocoptis sanchezi Torre & Bartsch, 1972
sanchezi, Macroceramus sanchezi Torre & Bartsch, 1972
sanctannae, Urocoptis sanctannae (Pilsbry, 1902)
sancticola, Uncinicoptis sancticola Torre & Bartsch, 1972
sanctispiritensis, Microceramus sanctispiritensis Pilsbry, 1913
sanguinea, Urocoptis sanguinea Pfeiffer, 1845
sanguinea meridionalis, Spirocoptis sanguinea meridionalis Pilsbry, 1902 - syn of: Urocoptis sanguinea Pfeiffer, 1845
sanguinea perplexa, Eucalodium sanguinea perplexa Vendryes, 1901 - syn of: Urocoptis sanguinea Pfeiffer, 1845
santacruzensis, Johaniceramus longus santacruzensis Torre & Bartsch
santacruzensis, Tetrentodon santacruzensis Torre & Bartsch, 1972
santarosana, Trilamellaxis parallela santarosana Torre & Bartsch
sardae, Tetrentodon sardae Torre & Bartsch, 1972
sargi, Brachypodella morini sargi Von Martens
sauvalleanus, Tomelasmus sauvalleanus (Gundlach, 1856)
sauvelleana, Urocoptis sauvelleana (Gundlach, 1856)
saxosa, Liocallonia saxosa (Poey, 1857)
scabrosa, Idiostemma scabrosa (Gundlach, 1859)
scabrum, Goniapex scabrum Thompson & Mihalcik, 2011
scaeva, Pycnoptychia scaeva (Gundlach, 1863)
scalarina, Tetrentodon scalarina Torre & Bartsch, 1972
scaphopleuron, Coelostemma scaphopleuron Thompson, 1988
scholapii, Sagracoptis scholapii Torre & Bartsch, 1972 - syn of: Sagracoptis scholappi Torre & Bartsch, 1972
scholappi, Sagracoptis scholappi Torre & Bartsch, 1972
scobinata, Arangia scobinata (Torre & Ramsden, 1915)
scololaema, Holospira scololaema Thompson & Mihalcik, 2005
sculpturata, Orienticoptis sculpturata (Pilsbry, 1929)
sculturata, Orienticoptis sculturata Pilsbry, 1929 - syn of: Orienticoptis sculpturata (Pilsbry, 1929)
seibaboensis, Centralia turgida seibaboensis Torre & Bartsch
semicoloratus, Tomelasmus semicoloratus (Spence, 1936)
semicostata, Gongylostomella strigis semicostata Torre & Bartsch
semicostata, Gongylostomella semicostata Torre & Bartsch, 1972
seminuda, Brachypodella seminuda Adams, 1845
semisculpta, Haplocion semisculpta (Stearns, 1890)
semistriata, Tetrentodon semistriata Aguayo, 1932
semistriata, Torrecoptis semistriata Torre & Bartsch, 1972
serrana, Torrecoptis serrana Torre & Bartsch, 1972
sexdecimalis, Tetrentodon sexdecimalis (Jimeno, 1863)
sherbrookei, Holospira sherbrookei Gilbertson, 1989
shuttleworthiana, Pycnoptychia shuttleworthiana (Poey, 1856)
siboneyensis, Macroceramus siboneyensis Torre & Bartsch, 1972
sifontesi, Torrecoptis sifontesi Torre & Bartsch, 1972
signae, Organocoptis integra signae Torre & Bartsch
signatus, Microceramus signatus (Guilding, 1828)
signatus salleanus, Microceramus signatus salleanus Pilsbry, 1903
silvicola, Organocoptis integra silvicola Torre & Bartsch
simile, Spirostemma simile (Adams, 1849)
similimus, Tomelasmus irroratus similimus Torre & Bartsch
simonis, Tomelasmus thomsoni simonis Torre & Bartsch
simplex, Microceramus simplex (Pfeiffer, 1863)
sinaloensis, Microceramus costellaris sinaloensis Torre & Bartsch
sinistra, Pfeiffericoptis sinistra Torre & Bartsch, 1972
sinuata, Anoma sinuata (Adams, 1851)
smithiuanum, Brachypodella smithiuanum Pfeiffer, 1866
solaensis, Torrecoptis livida solaensis Torre & Bartsch
solasensis, Torrecoptis livida solasensis Torre & Bartsch
solatius, Tomelasmus crenulatus solatius Torre & Bartsch
solida, Anoma solida (Adams, 1851)
soluta, Cochlodinella soluta (Pfeiffer, 1863)
sordidula, Torrecoptis bacillaris sordidula Torre
soroaensis, Liocallonia patruelis soroaensis Torre & Bartsch
sororcula, Torrecoptis sororcula Torre & Bartsch, 1972
sosai, Poeycoptis sosai Torre & Bartsch, 1972
sotonensis, Liocallonia patruelis sotonensis Torre & Bartsch
souvallei, Tomelasmus souvallei (Gundlach, 1856)
sowerbyana, Arangia sowerbyana (Pfeiffer, 1846)
sparsicostata, Tetrentodon sparsicostata Torre & Bartsch, 1972
sparsus, Tomelasmus irroratus sparsus Torre & Bartsch
spatiata, Torrecoptis spatiata Torre & Bartsch, 1972
spatiosa, Gongylostoma spatiosa Torre & Bartsch, 1972
speciosum, Resupinata speciosum (Dunker, 1844)
speciosum boucardi, Resupinata speciosum boucardi (Pfeiffer, 1856)
speciosum fischeri, Resupinata speciosum fischeri Von Martens, 1897
speciosum minimum, Resupinata speciosum minimum Von Martens, 1897
speciosum strebeli, Resupinata speciosum strebeli Von Martens, 1897
spelucae dubia, Cylindrella spelucae dubia Pilsbry, 1891 - syn of: Brachypodella dubia (Pilsbry, 1891)
speluncae, Brachypodella speluncae (Morelet, 1852)
spirifer, Torrecoptis spirifer (Pilsbry, 1930)
splendens, Anoma splendens (Menke, 1841)
splendens medinae, Anoma splendens medinae Baker, 1935 - syn of: Anoma splendens (Menke, 1841)
splendidum, Oligostylus splendidum (Pfeiffer, 1860)
stearnsi, Dissotropis stearnsi (Bartsch, 1906)
stearnsi, Poeycoptis lituus stearnsi Gundlach
stenocion, Coelocentrum stenocion Thompson, 1968
stenopylis, Holospira stenopylis Pilsbry, 1953
stibe, Autocoptis stibe Thompson & Franz, 1976
strangulata, Pycnoptychia strangulata (Poey, 1856)
strebeli, Trachycion strebeli (Pfeffer, 1887)
strebeli, Anisospira strebeli Dall, 1897 - syn of: Anisospira dalli (Von Martens, 1901)
strebeli, Resupinata speciosum strebeli Von Martens
strebeliana, Holospira strebeliana Pilsbry, 1902 - syn of: Coelostemma dalli (Pilsbry, 1902)
striata, Anoma striata (Adams, 1851)
striata, Cylindrella striata Chitty, 1853 - syn of: Bactrocoptis rosea (Pfeiffer, 1844)
striatella, Pycnoptychia striatella (Wright, 1864)
striatella, Sonoraloa dentaxis striatella Pilsbry
striatissima, Ventricochis striatissima Torre & Bartsch, 1972
stricta, Torrecoptis stricta (Torre, 1912)
strigis, Gongylostomella strigis Torre & Bartsch, 1972
strigis altosongoensis, Gongylostomella strigis altosongoensis Torre & Bartsch, 1972
strigis semicostata, Gongylostomella strigis semicostata Torre & Bartsch, 1972
stringens, Anisospira dalli stringens Thompson
striosa, Tetrentodon striosa Torre & Bartsch, 1972
strohmi, Autocoptis guigouana strohmi Petit De La Saussaye
subcylindricus, Macroceramus subcylindricus Pilsbry
subelegans, Gongylostoma elegans subelegans Pilsbry
subelegans, Gongylostoma subelegans Pilsbry, 1904
sublapidea, Heterocoptis sublapidea Torre & Bartsch, 1972
sublatus, Microceramus sublatus Pilsbry & Torre, 1929
subtilis, Brachypodella subtilis (Morelet, 1849)
subtilis pulchella, Brachypodella subtilis pulchella (Von Martens, 1886)
subula, Brachypodella subula (Férussac, 1821)
subulatus, Microceramus subulatus Pilsbry & Torre, 1929 - syn of: Microceramus sublatus Pilsbry & Torre, 1929
sumichrasti, Eucalodium sumichrasti Crosse & Fischer, 1878
swifti, Microceramus swifti (Bland, 1874)
tabacaria, Heterocoptis tabacaria Torre & Bartsch, 1972
tacoensis, Tomelasmus irroratus tacoensis Torre & Bartsch
tacotacoensis, Liocallonia tacotacoensis Torre & Bartsch, 1972
tamaulipensis, Bostrichocentrum tamaulipensis Bartsch, 1906
tanamensis, Brachypodella tanamensis Torre & Bartsch, 1972
tantalus, Holospira tantalus Bartsch, 1906
tantalus, Microceramus tantalus Torre & Bartsch, 1972
tanydeira, Coelocentrum tanydeira Thompson, 1968
tatei, Brachypodella tatei (Crosse, 1872)
telescopium, Ptychodonta telescopium Thompson & Correa-Sandoval, 1994
temeroso, Holospira temeroso Pilsbry, 1953
tenellum, Spirostemma tenellum (Adams, 1849)
tenellum tenerum, Spirostemma tenellum tenerum (Adams, 1849)
tenericola, Uncinicoptis tenericola Torre & Bartsch, 1972
teneriensis, Teneria teneriensis (Wright, 1865)
tenerum, Spirostemma tenellum tenerum Adams
teniusculpta, Torrecoptis teniusculpta Torre & Bartsch, 1972 - syn of: Torrecoptis tenuisculpta Torre & Bartsch, 1972
tenuicostata, Tetrentodon tenuicostata Torre & Bartsch, 1972
tenuisculpta, Torrecoptis tenuisculpta Torre & Bartsch, 1972
tenuistriata, Tetrentodon tenuistriata Aguayo, 1932
tenuistriatus, Microceramus tenuistriatus Pilsbry, 1913
tenuiter, Centralia turgida tenuiter Torre & Bartsch
teotitlana, Holospira teotitlana Bartsch, 1945
teotitlana filia, Holospira teotitlana filia Bartsch, 1945 - syn of: Holospira teotitlana Bartsch, 1945
terebella, Geminicoptis terebella (Torre, 1929)
terebra, Pineria terebra Poey, 1854
teres, Holospira teres (Menke, 1847)
teres hogeana, Holospira teres hogeana Von Martens, 1897 - syn of: Holospira hogeana Von Martens, 1897
teres minor, Holospira teres minor Von Martens, 1897 - syn of: Holospira teres (Menke, 1847)
terneroensis, Gongylostomella terneroensis Torre & Bartsch, 1972
tesicoensis, Torrecoptis livida tesicoensis Torre & Bartsch
tesselata, Anoma tesselata (Adams, 1851)
tetralasma, Holospira tetralasma Pilsbry, 1902
texanus, Microceramus texanus Pilsbry, 1898
thomsoni, Tomelasmus thomsoni (Arango, 1884)
thomsoni perezi, Tomelasmus thomsoni perezi Torre & Bartsch, 1972
thomsoni simonis, Tomelasmus thomsoni simonis Torre & Bartsch, 1972
tomacella, Coelocentrum tomacella (Morelet, 1849)
tomacella adelphion, Coelocentrum tomacella adelphion Thompson, 1968
tomacella attenuatum, Coelocentrum tomacella attenuatum (Pfeiffer, 1856)
tomacella clava, Coelocentrum tomacella clava (Pfeiffer, 1856)
tomacella rufescens, Coelocentrum tomacella rufescens Von Martens, 1897
tomasensis, Badiofaux trilamellata tomasensis Torre & Bartsch
topochicoana, Holospira topochicoana Bartsch, 1926
torosum, Crossostephanus torosum Thompson, 1994
torquatus, Tomelasmus torquatus (Morelet, 1849)
torquatus limonensis, Tomelasmus torquatus limonensis Torre & Bartsch, 1972
torreana, Centralia torreana (Pilsbry, 1929)
torreana, Brachypodella torreana Ramsden, 1914
torrebartschi, Liocallonia torrebartschi Herrera-Uria & Espinosa, 2016
torrei, Pycnoptychia torrei (Arango, 1876)
torrei, Macroceramus torrei Pilsbry, 1930
torrei, Holospira torrei Pilsbry, 1935
townsendi, Goniapex townsendi (Bartsch, 1906)
townsendi, Trachycion recticosta townsendi Pilsbry & Cockerell
transaperta, Cylindrella transaperta Sowerby, 1875 - syn of: Urocoptis nobilior Adams, 1845
transitoria, Trilamellaxis transitoria (Torre, 1911)
transparens, Urocoptis transparens (Pfeiffer)
tricolor, Anoma tricolor Pfeiffer, 1852
trilamellata, Badiofaux trilamellata (Pfeiffer, 1864)
trilamellata tomasensis, Badiofaux trilamellata tomasensis Torre & Bartsch, 1972
trimellata, Gongylostoma trimellata (Pfeiffer, 1864)
trina, Pycnoptychia trina Torre & Bartsch, 1972
trina cotorricola, Pycnoptychia trina cotorricola Torre & Bartsch, 1972
trina nazarena, Pycnoptychia trina nazarena Torre & Bartsch, 1972
trincherasensis, Torrecoptis trincherasensis Torre & Bartsch, 1972
trinidadensis, Microceramus trinidadensis Torre & Bartsch, 1972
trinitaria, Brachypodella trinitaria (Pfeiffer, 1860)
triplicata, Liocallonia triplicata (Arango, 1882)
trochaeformis, Cylindrella trochaeformis Sowerby, 1843 - syn of: Anisospira liebmanni (Pfeiffer, 1846)
truncata, Cylindrella truncata Von Martens, 1865 - syn of: Oligostylus hegewischi (Bartsch, 1947)
truncatula, Amphicosmia truncatula (Lamarck, 1822)
tryoni, Bostrichocentrum tryoni (Pfeiffer, 1867)
tryoni appressa, Holospira tryoni appressa Fischer & Crosse, 1873 - syn of: Bostrichocentrum tryoni (Pfeiffer, 1867)
tryoni gealei, Holospira tryoni gealei Adams, 1872 - syn of: Bostrichocentrum gealei (Adams, 1872)
tuba, Centralia tuba (Torre, 1911)
tuba distanter, Centralia tuba distanter Torre & Bartsch, 1972
tumidiorus, Tomelasmus tumidiorus (Sowerby, 1875)
tumidula, Brachypodella tumidula Clench & Aguayo, 1957
turcasiana, Brachypodella turcasiana (Gundlach, 1859)
turgens, Trilamellaxis proteus turgens Torre & Bartsch
turgida, Centralia turgida (Torre, 1911)
turgida dolorensis, Centralia turgida dolorensis Torre & Bartsch, 1972
turgida doloresensis, Centralia turgida doloresensis Torre & Bartsch, 1972
turgida guajacoensis, Centralia turgida guajacoensis Torre & Bartsch, 1972
turgida seibaboensis, Centralia turgida seibaboensis Torre & Bartsch, 1972
turgida tenuiter, Centralia turgida tenuiter Torre & Bartsch, 1972
turiguanoensis, Cochlodinella turiguanoensis Torre & Bartsch, 1972
turneri, Gongylostomella turneri (Pilsbry, 1930)
turneri mirandaensis, Gongylostomella turneri mirandaensis Torre & Bartsch, 1972
turricula, Microceramus turricula (Pfeiffer, 1839)
turris, Coelocentrum turris (Pfeiffer, 1856)
tyla, Coelocentrum tyla Thompson, 1968
uncata, Idiostemma uncata (Pfeiffer, 1859)
unctuella, Torrecoptis unctuella Torre & Bartsch, 1972
unguiculata, Uncinicoptis unguiculata (Arango, 1880)
unicarinatus, Macroceramus unicarinatus (Lamarck, 1822)
utriculus, Macroceramus utriculus Torre & Bartsch, 1972
vagans, Cenocoptis andresensis vagans Torre & Bartsch
validus, Tomelasmus decoloratus validus Torre & Bartsch
vanattai, Spiroceramus vanattai Clench
vanattai, Macroceramus vanattai Pilsbry, 1930
vanattai greenfieldi, Macroceramus vanattai greenfieldi Torre & Bartsch, 2008
vanduzeei, Spartocentrum vanduzeei Hanna, 1923
variabilis, Macroceramus variabilis Pfeiffer, 1863
variegata, Cochlodinella variegata (Pfeiffer, 1842)
variegata cuzcoensis, Cochlodinella variegata cuzcoensis Torre & Bartsch, 1972
variegata occidentalis, Cochlodinella variegata occidentalis Torre & Bartsch, 1972
variegata rosariensis, Cochlodinella variegata rosariensis Torre & Bartsch, 1972
velascorum, Trachycion velascorum Breure, 1977
ventricosa, Steatocoptis ventricosa (Gundlach, 1857)
veracruziana, Bostrichocentrum veracruziana Dall, 1895
veracruzicola, Bostrichocentrum veracruzicola (Bartsch, 1943)
vermicularis, Tetrentodon vermicularis (Torre, 1929)
vermicularis, Torrecoptis vermicularis Torre & Bartsch, 1972
vermicularis fortis, Torrecoptis vermicularis fortis Torre & Bartsch, 1972
vesperalis, Tetrentodon vesperalis Torre & Bartsch, 1972
vesperalis, Callocoptis vesperalis Torre & Bartsch, 1972
vicina, Organocoptis vigilantes vicina Torre & Bartsch
victoris, Orienticoptis victoris Torre & Bartsch, 1972
viequensis, Pseudopineria viequensis (Pfeiffer, 1856)
vigiana, Levicoptis vigiana Torre & Bartsch, 1972
vigilantes, Organocoptis vigilantes Torre & Bartsch, 1972
vigilantes vicina, Organocoptis vigilantes vicina Torre & Bartsch, 1972
vignalensis, Nodulia vignalensis (Wright, 1863)
vignalensis atrata, Nodulia vignalensis atrata Torre & Bartsch, 1972
vignalensis balnearum, Nodulia vignalensis balnearum (Pilsbry, 1930)
vignalensis cabrerai, Nodulia vignalensis cabrerai Torre & Bartsch, 1972
vignalensis demolita, Nodulia vignalensis demolita Torre & Bartsch, 1972
vignalensis pallens, Nodulia vignalensis pallens Torre & Bartsch, 1972
villarensis, Centralia villarensis (Torre, 1911)
vincta, Liocallonia vincta (Gundlach, 1863)
violacea, Gongylostoma violacea Pfeiffer, 1864
violacea, Cylindrella violacea Swainson, 1822 - syn of: Urocoptis cylindrus (Dillwyn, 1817)
virgalensis, Nodulia virgalensis (Pfeiffer, 1863)
virilus, Microceramus virilus Torre & Bartsch, 1972
viruelaensis, Tetrentodon viruelaensis Torre & Bartsch, 1972
vitulina, Torrecoptis vitulina Torre & Bartsch, 1972
vivax, Torrecoptis bacillaris vivax Pilsbry
volubilis, Liocallonia volubilis (Morelet, 1849)
volubilis cortinal, Liocallonia volubilis cortinal Torre & Bartsch, 1972
volubilis galonensis, Liocallonia volubilis galonensis Torre & Bartsch, 1972
volubilis limonesensis, Liocallonia volubilis limonesensis Torre & Bartsch, 1972
vonmartensi, Anisospira vonmartensi (Strebel, 1880)
walpoleanum, Eucalodium walpoleanum Crosse & Fischer, 1872
welchi, Torrecoptis welchi Torre & Bartsch, 1972
whetstonensis, Holospira whetstonensis Pilsbry & Ferriss, 1923
whittami, Heterocoptis whittami Torre & Bartsch, 1972
wilmoti, Styloptyx wilmoti (Bartsch, 1951)
wilmoti, Haplocion wilmoti Bartsch, 1947
wilmoti, Liocentrum wilmoti Bartsch, 1948 - syn of: Anisospira liebmanni (Pfeiffer, 1846)
wrighti, Gongylostomella wrighti (Pfeiffer, 1862)
wrighti, Macroceramus wrighti Torre & Bartsch, 1972
wrightiana, Pfeiffericoptis wrightiana Torre & Bartsch, 1972
yaguajayensis, Mimiaxis yaguajayensis (Torre & Bartsch, 1972)
yaguajayensis, Torrecoptis yaguajayensis Torre & Bartsch, 1972 - syn of: Mimiaxis yaguajayensis (Torre & Bartsch, 1972)
yaquensis, Sonoraloa remondii yaquensis Pilsbry
yateresense, Macroceramus yateresense Sánchez Roig
yemenensis, Brachypodella prevali yemenensis Torre & Bartsch
yucatanensis, Haplocion yucatanensis (Bartsch, 1906)
yucatensis, Holospira yucatensis Bartsch, 1906
yunguensis, Pleurostemma perplicata yunguensis Torre & Bartsch
zanjonensis, Torrecoptis zanjonensis Torre & Bartsch, 1972
zebra, Tomelasmus crenulatus zebra Torre & Bartsch
zebrina, Cylindrella zebrina Pfeiffer, 1854 - syn of: Anoma tesselata (Adams, 1851)
zonata, Urocoptis zonata Kira, 1955
zuluetensis, Trilamellaxis parallela zuluetensis Torre & Bartsch
zygoptyx, Holospira zygoptyx Thompson & Mihalcik, 2005
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