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acutedentata, Polygyra acutedentata (Binney, 1858)
alabamensis, Triodopsis alabamensis Pilsbry, 1902
albicostulata, Linisia albicostulata (Pilsbry, 1896)
albolabris, Neohelix albolabris (Say, 1817)
albolabris alleni, Neohelix albolabris alleni (Sampson, 1883)
algonquinensis, Webbhelix multilineata algonquinensis Nason
aliciae, Stenotrema monodon aliciae Pilsbry
alleni, Neohelix albolabris alleni Sampson
altispira, Stenotrema altispira Pilsbry, 1894
altivagus, Akromesodon altivagus (Pilsbry, 1900)
amblya, Ashmunella amblya Pilsbry, 1940
ampla, Praticolella ampla (Pfeiffer, 1866)
analis, Polygyra analis Gabb, 1865 - syn of: Linisia anilis (Gabb, 1865)
andrewsae, Mesodon andrewsae Binney, 1879
angellum, Stenotrema angellum Hubricht, 1958
angigyra, Ashmunella levettei angigyra Pilsbry
angulata, Ashmunella proxima angulata Pilsbry
anilis, Linisia anilis (Gabb, 1865)
animasensis, Ashmunella animasensis Vagvolgyi, 1974
anlis, Linisia anlis Gabb, 1865 - syn of: Linisia anilis (Gabb, 1865)
anteridon, Triodopsis anteridon Pilsbry, 1940
appressus, Mesodon appressus (Say, 1821)
approximans, Inflectarius approximans (Clapp, 1905)
apressus, Mesodon apressus Say, 1821 - syn of: Mesodon appressus (Say, 1821)
archeri, Fumonelix archeri (Pilsbry, 1940)
ariadna, Daedalochila ariadna Binney, 0 - syn of: Linisia ariadnae (Pfeiffer, 1848)
ariadnae, Linisia ariadnae (Pfeiffer, 1848)
armigera, Vespericola armigera (Ancey, 1881)
ashmuni, Ashmunella ashmuni (Dall, 1897)
aulacomphala, Linisia aulacomphala (Pilsbry & Hinkley, 1907)
auriculata, Polygyra auriculata Say, 1818
auriformis, Daedalochila auriformis Bland, 1859
avara, Daedalochila avara (Say, 1818)
bahamensis, Polygyra plana bahamensis Vanatta
bakeri, Praticolella bakeri Vanatta, 1915
barbata, Polygyra barbata Clapp, 1904
barbatus, Stenotrema hirsutus barbatus Clapp
barbigerum, Stenotrema barbigerum Redfield, 1856
behri, Linisia behri (Gabb, 1865)
bequaerti, Ashmunella bequaerti Clench & Miller, 1966
berlandieriana, Praticolella berlandieriana (Moricand, 1833)
berlandieriana taeniata, Praticolella berlandieriana taeniata Pilsbry, 1940 - syn of: Praticolella taeniata Pilsbry, 1940
bicornuta, Daedalochila uvulifera bicornuta Pilsbry
bicruris, Linisia bicruris (Pfeiffer, 1857)
bicruris insculpta, Linisia bicruris insculpta Pilsbry, 1956
bifurca, Ashmunella levettei bifurca Pilsbry & Ferriss
binneyana, Patera binneyana Pilsbry, 1899
binneyi, Ashmunella binneyi Pilsbry & Ferriss, 1917
blandianum, Stenotrema blandianum Pilsbry, 1903
borealis, Daedalochila borealis Linnaeus, 1767 - syn of: Lucinoma borealis (Linnaeus, 1767)
brevipila, Stenotrema brevipila Clapp, 1907
bucculentus, Mesodon thyroidus bucculentus Gould
burchi, Triodopsis burchi Hubricht, 1950
burlesoni, Upsilodon burlesoni Metcalf & Riskind, 1978
burringtoni, Stenotrema burringtoni Grimm, 1971
caddoensis, Stenotrema caddoensis (Archer, 1935)
calvescens, Stenotrema calvescens Hubricht, 1961
campi, Praticolella campi Clapp & Ferriss, 1919
candida, Praticolella candida Hubricht, 1983
cantralli, Linisia cantralli Solem, 1957
carlsbadensis, Ashmunella carlsbadensis Pilsbry, 1932
carolinensis, Xolotrema carolinensis Lea, 1834 - syn of: Xolotrema caroliniense Lea, 1834
caroliniense, Xolotrema caroliniense Lea, 1834
caroliniensis, Triodopsis caroliniensis Lea, 1834 - syn of: Xolotrema caroliniense Lea, 1834
carpenteriana, Polygyra cereolus carpenteriana Bland
cereolus, Polygyra cereolus (Von Mühlfeld, 1816)
cereolus carpenteriana, Polygyra cereolus carpenteriana (Bland, 1860)
chadwicki, Webbhelix chadwicki (Ferriss, 1907)
cheatumi, Stenotrema cheatumi (Fullington, 1974)
chiapensis, Polygyra chiapensis (Pfeiffer, 1856)
chilhoweensis, Appalachina chilhoweensis (Lewis, 1870)
chiricahuana, Ashmunella chiricahuana (Dall, 1896)
chiricahuana esuritor, Ashmunella chiricahuana esuritor Pilsbry, 1905
chisosensis, Daedalochila chisosensis Pilsbry, 1936
christyi, Fumonelix christyi (Bland, 1860)
claibornensis, Triodopsis claibornensis Lutz, 1950
clarki, Patera clarki Lea, 1858
clarki nantahala, Patera clarki nantahala Clench, 1933
clausus, Mesodon clausus Say, 1821
clenchi, Patera clenchi Rehder, 1932
clingmanicus, Mesodon clingmanicus (Pilsbry, 1904)
cockerelli, Ashmunella cockerelli Pilsbry & Ferriss, 1917
cohuttense, Stenotrema cohuttense Clapp, 1914
columbiana, Vespericola columbiana (Henderson, 1928)
columbiana pilosa, Vespericola columbiana pilosa Henderson, 1928 - syn of: Vespericola columbiana (Henderson, 1928)
complanata, Triodopsis complanata (Pilsbry, 1898)
copei, Triodopsis copei (Wetherby, 1878)
corneliae, Giffordius corneliae Pilsbry, 1930
couloni, Polygyra couloni (Shuttleworth, 1852)
cragini, Triodopsis cragini Call, 1886
dalli, Upsilodon dalli Metcalf & Riskind, 1978
danielsi, Ashmunella danielsi Pilsbry & Ferriss, 1915
deceptum, Stenotrema deceptum Clapp, 1905
delecta, Daedalochila delecta Hubricht, 1976
deltoidea, Millerelix deltoidea (Simpson, 1889)
denotata, Triodopsis denotata Férussac, 1821
dentifera, Neohelix dentifera (Binney, 1837)
depilatum, Stenotrema depilatum Pilsbry, 1895
devia, Cryptomastix devia (Gould, 1846)
discoidea, Triodopsis discoidea Pilsbry, 1904
dissecta, Polygyra dissecta Von Martens, 1892
divesta, Neohelix divesta (Gould, 1848)
dorfeuilliana, Daedalochila dorfeuilliana (Lea, 1838)
dorfeuilliana sampsoni, Daedalochila dorfeuilliana sampsoni Wetherby, 1881
dorfueilliana, Polygyra dorfueilliana Lea, 1838 - syn of: Daedalochila dorfeuilliana (Lea, 1838)
downieanus, Inflectarius downieanus (Bland, 1861)
duplicidens, Ashmunella duplicidens Pilsbry, 1905
dysoni, Polygyra dysoni (Shuttleworth, 1852)
edentata, Ashmunella rhyssa edentata Cockerell
edentatus, Inflectarius edentatus (Sampson, 1889)
edentilabris, Triodopsis tridentata edentilabris Pilsbry
edgarianum, Stenotrema edgarianum Lea, 1841
edithae, Ashmunella edithae Pilsbry & Cheatum, 1951
edvardsi, Stenotrema edvardsi Bland, 1856 - syn of: Stenotrema edwardsi (Bland, 1856)
edwardsi, Stenotrema edwardsi (Bland, 1856)
elevatus, Mesodon elevatus Say, 1821
emigrans, Ashmunella proxima emigrans Pilsbry
endentatus, Inflectarius endentatus (Say, 1821)
eritrichius, Vespericola eritrichius Berry, 1939
esuritor, Ashmunella chiricahuana esuritor Pilsbry
euglypta, Linisia euglypta (Pilsbry, 1896)
exodon, Stenotrema exodon Pilsbry, 1900
exodon turbinella, Stenotrema exodon turbinella (Clench & Archer, 1933)
falcata, Triodopsis falcata (Gould, 1850)
fallax, Triodopsis fallax (Say, 1825)
fasciatum, Euchemotrema fasciatum Pilsbry, 1940
fastigiata, Millerelix fastigiata (Say, 1829)
fatigiata, Lobosculum fatigiata (Say, 1829)
ferrissi, Ashmunella ferrissi Pilsbry, 1905
fissidens, Ashmunella proxima fissidens Pilsbry
flavescens, Praticolella flavescens (Pfeiffer, 1848)
florida, Stenotrema florida Pilsbry, 1940
fosteri, Xolotrema fosteri Baker, 1921
fraternum, Euchemotrema fraternum (Say, 1824)
fraudulenta, Triodopsis fraudulenta (Pilsbry, 1894)
fulciden, Triodopsis fulciden Hubricht, 1952
fulcidens, Triodopsis fulcidens Hubricht, 1952 - syn of: Triodopsis fulciden Hubricht, 1952
fuscolabris, Neohelix fuscolabris (Pilsbry, 1903)
germana, Cryptomastix germana (Gould, 1851)
gracilis, Millerelix gracilis (Hubricht, 1961)
griseola, Praticolella griseola (Pfeiffer, 1841)
guadalajarensis, Linisia hindsi guadalajarensis Pilsbry
haplus, Vespericola haplus (Berry, 1933)
harfordiana, Cryptomastix harfordiana (Binney, 1886)
harrisi, Ashmunella harrisi Metcalf & Smartt, 1977
hausmani, Daedalochila hausmani Jackson, 1948
hebardi, Ashmunella hebardi Pilsbry & Vanatta, 1923
helictomphala, Polygyra helictomphala Pfeiffer, 1856 - syn of: Polygyra yucatanea (Morelet, 1849)
hendersoni, Cryptomastix mullani hendersoni Pilsbry
henriettae, Triodopsis henriettae (Mazÿck, 1877)
herberti, Mesodon herberti (Walker, 1928)
hertleini, Linisia hertleini Haas, 1961
heterodonta, Ashmunella levettei heterodonta Pilsbry
heteroea, Linisia hindsi heteroea Pilsbry
hindsi, Linisia hindsi (Pfeiffer, 1845)
hindsi guadalajarensis, Linisia hindsi guadalajarensis (Pilsbry, 1910)
hindsi heteroea, Linisia hindsi heteroea Pilsbry, 1956
hippocrepis, Daedalochila hippocrepis Pfeiffer, 1848
hirsutus, Stenotrema hirsutus (Say, 1817)
hirsutus, Hochbergellus hirsutus Roth & Miller, 1992
hirsutus barbatus, Stenotrema hirsutus barbatus (Clapp, 1904)
hopetonensis, Triodopsis hopetonensis Shuttleworth, 1852
hubrichti, Euchemotrema hubrichti Pilsbry, 1940
idiogenes, Upsilodon idiogenes Pilsbry, 1956
implicata, Linisia implicata (Von Martens, 1865)
indianorum, Patera indianorum Pilsbry, 1899
inflectus, Inflectarius inflectus (Say, 1821)
insculpta, Linisia bicruris insculpta Pilsbry
intricata, Ashmunella intricata Pilsbry, 1948
jacksoni, Millerelix jacksoni (Bland, 1866)
jaliscoensis, Linisia matermontana jaliscoensis Pilsbry
jejuna, Praticolella jejuna (Say, 1821)
jonesiana, Fumonelix jonesiana (Archer, 1938)
juarazensis, Ashmunella juarazensis Pilsbry, 1948
juxtidens, Triodopsis juxtidens Pilsbry, 1894
kalmianus, Inflectarius kalmianus Hubricht, 1965
karakorum, Vespericola karakorum Talmadge, 1962
karokorum, Vespericola karokorum Talmadge, 1962 - syn of: Vespericola karakorum Talmadge, 1962
kiowaensis, Patera kiowaensis Simpson, 1888
klamathicus, Vespericola klamathicus Roth & Miller, 1995
kochii, Ashmunella kochii Clapp, 1908
labrosum, Stenotrema labrosum Bland, 1862
laevior, Patera laevior Pilsbry, 1940
latispira, Polygyra latispira Pilsbry, 1896
lawae, Praticolella lawae (Lewis, 1874)
leai, Stenotrema leai Binney, 1841 - syn of: Stenotrema monodon Rackett, 1821
leai aliciae, Stenotrema leai aliciae Pilsbry, 1893 - syn of: Stenotrema monodon aliciae (Pilsbry, 1893)
leai cheatumi, Stenotrema leai cheatumi Fullington, 1974 - syn of: Stenotrema cheatumi (Fullington, 1974)
leatherwoodi, Patera leatherwoodi Pratt, 1971
lenticula, Ashmunella lenticula Gregg, 1953
lepiderma, Ashmunella proxima lepiderma Pilsbry & Ferriss
leporina, Daedalochila leporina Gould, 1848
levettei, Ashmunella levettei (Bland, 1881)
levettei angigyra, Ashmunella levettei angigyra Pilsbry, 1905
levettei bifurca, Ashmunella levettei bifurca Pilsbry & Ferriss, 1910
levettei heterodonta, Ashmunella levettei heterodonta Pilsbry, 1905
levettei varicifera, Ashmunella levettei varicifera Ancey, 1901
lingulata, Polygyra lingulata (Deshayes, 1859)
lioderma, Neohelix lioderma Pilsbry, 1902
lithica, Millerelix lithica (Hubricht, 1961)
lombardii, Allogona lombardii Smith, 1943
loperi, Triodopsis loperi Pilsbry
loricata, Trilobopsis loricata (Gould, 1846)
lunula, Triodopsis lunula Rafinesque, 1819 - syn of: Triodopsis tridentata (Say, 1816)
macromphala, Ashmunella macromphala Vagvolgyi, 1974
magazinensis, Inflectarius magazinensis (Pilsbry & Ferriss, 1907)
magnafumosum, Stenotrema magnafumosum Pilsbry, 1900
magnidentata, Cryptomastix magnidentata Pilsbry, 1940
magnifumosum, Stenotrema magnifumosum Pilsbry, 1900 - syn of: Stenotrema magnafumosum Pilsbry, 1900
major, Neohelix major (Binney, 1837)
maratima, Triodopsis maratima Pilsbry, 1890
marinensis, Vespericola marinensis Roth & Miller, 1993
martensiana, Eduardus martensiana (Pilsbry, 1907)
matermontana, Linisia matermontana (Pilsbry, 1896)
matermontana jaliscoensis, Linisia matermontana jaliscoensis (Pilsbry, 1910)
maxillatum, Stenotrema maxillatum Gould, 1848
mearnsii, Ashmunella mearnsii (Dall, 1895)
megasoma, Vespericola megasoma (Pilsbry, 1928)
mendax, Ashmunella mendax Pilsbry & Ferriss, 1917
meridionalis, Ashmunella meridionalis Pilsbry, 1948
messana, Triodopsis messana Hubricht, 1952
metamorphosa, Ashmunella metamorphosa Pilsbry, 1905
mexicana, Praticolella mexicana Perez, 2011
microdonta, Ashmunella microdonta Pilsbry & Ferriss, 1909
milesi, Ashmunella milesi Reeder, 1993
miorhyssa, Ashmunella rhyssa miorhyssa Dall
mitchellianus, Mesodon mitchellianus Lea, 1839
mobiliana, Praticolella mobiliana (Lea, 1841)
mogollonensis, Ashmunella mogollonensis Pilsbry, 1905
monodon, Stenotrema monodon Rackett, 1821
monodon aliciae, Stenotrema monodon aliciae (Pilsbry, 1893)
montivaga, Ashmunella montivaga Pilsbry, 1948
mooreana, Millerelix mooreana (Binney, 1858)
mudgei, Ashmunella mudgei Cheatum, 1971
mullani, Cryptomastix mullani (Bland & Cooper, 1861)
mullani hendersoni, Cryptomastix mullani hendersoni (Pilsbry, 1928)
multilineata, Webbhelix multilineata (Say, 1821)
multilineata algonquinensis, Webbhelix multilineata algonquinensis (Nason, 1906)
multiplicata, Upsilodon multiplicata Metcalf & Riskind, 1978
nantahala, Patera clarki nantahala Clench
nayarita, Polygyra nayarita Pilsbry & Cockerell, 1925 - syn of: Linisia ventrosula (Pfeiffer, 1845)
neglecta, Triodopsis neglecta Pilsbry, 1899
nelsoni, Linisia nelsoni (Dall, 1897)
nelsoni colisella, Polygyra nelsoni colisella Dall, 0 - syn of: Linisia nelsoni (Dall, 1897)
normalis, Akromesodon normalis (Pilsbry, 1900)
notata, Xolotrema notata Férussac, 1821 - syn of: Triodopsis denotata Férussac, 1821
obsoleta, Triodopsis obsoleta Pilsbry, 1894
obstricta, Triodopsis obstricta Say, 1821 - syn of: Xolotrema obstrictum Say, 1821
obstrictum, Xolotrema obstrictum Say, 1821
occidentale, Xolotrema occidentale Pilsbry & Ferriss, 1907
occidentalis, Triodopsis occidentalis Pilsbry & Ferriss, 1907 - syn of: Xolotrema occidentale Pilsbry & Ferriss, 1907
oppilata, Linisia oppilata (Morelet, 1849)
oppilata implicata, Polygyra oppilata implicata Von Martens, 1865 - syn of: Linisia implicata (Von Martens, 1865)
orestes, Fumonelix orestes (Hubricht, 1975)
organensis, Ashmunella organensis Pilsbry, 1936
orius, Vespericola orius (Berry, 1933)
pachyloma, Praticolella pachyloma (Menke, 1847)
palliata, Triodopsis palliata Say
paludosa, Polygyra paludosa (Pfeiffer, 1839)
palustris, Triodopsis palustris Hubricht, 1958
panselenus, Patera panselenus Hubricht, 1976
pasonis, Ashmunella pasonis Drake, 1951
pendula, Triodopsis pendula Hubricht, 1952
peninsulae, Daedalochila peninsulae Pilsbry, 1940
penitens, Trilobopsis penitens (Hanna & Rixford, 1923)
pennsylvanica, Patera pennsylvanica (Green, 1827)
peregrina, Millerelix peregrina (Rehder, 1932)
pergrandis, Linisia pergrandis Solem, 1959
perigrapta, Patera perigrapta Pilsbry, 1894
picea, Triodopsis picea Hubricht, 1958
pilosa, Vespericola pilosa (Henderson, 1928)
pilsbryana, Ashmunella pilsbryana Ferriss, 1914
pilsbryi, Stenotrema pilsbryi Ferriss, 1900
pilula, Stenotrema pilula Pilsbry, 1900
pinchoti, Giffordius pinchoti Pilsbry, 1930
pinicola, Vespericola pinicola (Berry, 1916)
plagioglossa, Polygyra plagioglossa (Pfeiffer, 1859)
plana, Polygyra plana Dunker, 1843
plana bahamensis, Polygyra plana bahamensis Vanatta, 1919
platysayoides, Triodopsis platysayoides Brookes, 1933
plicata, Millerelix plicata (Say, 1821)
plioauriculata, Polygyra plioauriculata Sacco, 1889 † - syn of: Drepanostoma plioauriculata (Sacco, 1889) † (FOSSIL)
poeyi, Daedalochila poeyi Aguayo & Jaume, 1947
polita, Linisia polita (Pilsbry & Hinkley, 1907)
ponsonbyi, Linisia ponsonbyi (Pilsbry, 1896)
postelliana, Daedalochila postelliana Bland, 1859
pressleyi, Vespericola pressleyi Roth, 1985
prisca, Praticolella prisca Auffenberg & Portell, 1990 † (FOSSIL)
profunda, Allogona profunda (Say, 1821)
proxima, Ashmunella proxima Pilsbry, 1905
proxima angulata, Ashmunella proxima angulata Pilsbry, 1905
proxima emigrans, Ashmunella proxima emigrans Pilsbry, 1910
proxima fissidens, Ashmunella proxima fissidens Pilsbry, 1905
proxima lepiderma, Ashmunella proxima lepiderma Pilsbry & Ferriss, 1910
pseudodonta, Ashmunella pseudodonta (Dall, 1897)
ptychophora, Allogona ptychophora (Brown, 1870)
ptychopora, Allogona ptychopora (Brown, 1870)
pustula, Lobosculum pustula (Férussac, 1832)
pustuloides, Lobosculum pustuloides (Bland, 1858)
rhoadsi, Linisia rhoadsi (Pilsbry, 1899)
rhyssa, Ashmunella rhyssa (Dall, 1897)
rhyssa edentata, Ashmunella rhyssa edentata Cockerell, 1900
rhyssa miorhyssa, Ashmunella rhyssa miorhyssa (Dall, 1898)
rhyssa townsendi, Ashmunella rhyssa townsendi Bartsch, 1904 - syn of: Ashmunella townsendi Bartsch, 1904
richardsoni, Linisia richardsoni (Von Martens, 1892)
richardsoni lingualis, Polygyra richardsoni lingualis Pilsbry, 1899 - syn of: Linisia richardsoni (Von Martens, 1892)
richardsoni paucicostata, Polygyra richardsoni paucicostata Dall, 1926 - syn of: Linisia richardsoni (Von Martens, 1892)
rileyensis, Ashmunella rileyensis Metcalf & Hurley, 1971
roemeri, Patera roemeri (Pfeiffer, 1848)
roperi, Trilobopsis roperi (Pilsbry, 1889)
rothi, Vespericola rothi Cordero & Miller, 1995
rugeli, Inflectarius rugeli (Shuttleworth, 1852)
rugosa, Triodopsis rugosa Brooks & MacMillan, 1940
salina, Praticolella salina Perez & Ruiz, 2017
salinasensis, Ashmunella salinasensis Vagvolgyi, 1974
sampsoni, Daedalochila dorfeuilliana sampsoni Wetherby
sanburni, Cryptomastix sanburni (Binney, 1886)
sanus, Mesodon sanus Clench & Archer, 1933
sargentiana, Patera sargentiana Johnson & Pilsbry, 1892
sayana, Appalachina sayana (Pilsbry, 1906)
sayanas, Mesodon sayanas Pilsbry, 1906 - syn of: Appalachina sayana (Pilsbry, 1906)
scintilla, Polygyra scintilla Pilsbry & Hubricht, 1956 - syn of: Linisia polita (Pilsbry & Hinkley, 1907)
scotti, Vespericola scotti Cordero & Miller, 1995
septemvolva, Polygyra septemvolva Say, 1818
septemvolva volvoxis, Polygyra septemvolva volvoxis Pfeiffer, 1846
shasta, Vespericola shasta (Berry, 1921)
sierranus, Vespericola sierranus (Berry, 1921)
simile, Stenotrema simile Grimm, 1971
simpsoni, Millerelix simpsoni (Pilsbry & Ferriss, 1907)
smithi, Inflectarius smithi (Clapp, 1905)
soelneri, Triodopsis soelneri Henderson, 1907
solemi, Neohelix solemi Emberton, 1988
spinosum, Stenotrema spinosum Lea, 1830
sprouli, Ashmunella sprouli Fullington & Fullington
stenotrema, Stenotrema stenotrema Pfeiffer, 1842
sterni, Upsilodon sterni Metcalf & Riskind, 1978
strebeliana, Praticolella strebeliana Pilsbry, 1899
striata, Daedalochila uvulifera striata Pilsbry
subclausa, Daedalochila subclausa Pilsbry, 1899
subpalliatus, Inflectarius subpalliatus (Pilsbry, 1893)
subpersonatum, Triodopsis subpersonatum (Middendorff, 1851)
suprazonata, Linisia suprazonata (Pilsbry, 1899)
taeniata, Praticolella taeniata Pilsbry, 1940
tamaulipasensis, Linisia tamaulipasensis (Lea, 1857)
tehamana, Trilobopsis tehamana (Pilsbry, 1928)
tennesseensis, Triodopsis tennesseensis Walker & Pilsbry, 1902
tetrodon, Ashmunella tetrodon Pilsbry & Ferriss, 1915
texasensis, Linisia texasiana texasensis Pilsbry
texasiana, Linisia texasiana (Moricand, 1833)
texasiana, Polygyra texasiana Pfeiffer, 1848 - syn of: Linisia ariadnae (Pfeiffer, 1848)
texasiana tamaulipasensis, Polygyra texasiana tamaulipasensis Lea, 1857 - syn of: Linisia tamaulipasensis (Lea, 1857)
texasiana texasensis, Linisia texasiana texasensis (Pilsbry, 1902)
tholus, Polygyra tholus Binney, 1857
thompsoniana, Ashmunella thompsoniana (Ancey, 1887)
thomsoniana, Ashmunella thomsoniana Ancey, 1887 - syn of: Ashmunella thompsoniana (Ancey, 1887)
thyroides, Mesodon thyroides Say, 1816 - syn of: Mesodon thyroidus (Say, 1816)
thyroidus, Mesodon thyroidus (Say, 1816)
thyroidus bucculentus, Mesodon thyroidus bucculentus (Gould, 1848)
todseni, Ashmunella todseni Metcalf & Smartt, 1977
townsendi, Ashmunella townsendi Bartsch, 1904
townsendiana, Allogona townsendiana (Lea, 1838)
trachypepla, Trilobopsis trachypepla (Berry, 1933)
trichalis, Erectidens trichalis Pilsbry, 1953
tridentata, Triodopsis tridentata (Say, 1816)
tridentata edentilabris, Triodopsis tridentata edentilabris Pilsbry, 1894
trimatris, Praticolella trimatris Hubricht, 1983
triodontoides, Daedalochila triodontoides Bland, 1861
troostiana, Millerelix troostiana (Lea, 1839)
trossulus, Mesodon trossulus Hubricht, 1966
turbinella, Stenotrema exodon turbinella Clench & Archer
unciferum, Stenotrema unciferum Pilsbry, 1900
uvulifera, Daedalochila uvulifera Shuttleworth, 1852
uvulifera bicornuta, Daedalochila uvulifera bicornuta Pilsbry, 1900
uvulifera striata, Daedalochila uvulifera striata Pilsbry, 1940
vannostrandi, Triodopsis vannostrandi (Bland, 1875)
varicifera, Ashmunella levettei varicifera Ancey
ventrosula, Linisia ventrosula (Pfeiffer, 1845)
verus, Inflectarius verus Hubricht, 1954
virginianus, Polygyriscus virginianus (Burch, 1947)
volvoxis, Polygyra septemvolva volvoxis Pfeiffer
vulgata, Triodopsis vulgata Pilsbry, 1940
vultuosa, Triodopsis vultuosa Gould, 1848
waldense, Stenotrema waldense Archer, 1938
walkeri, Ashmunella walkeri Ferriss, 1904
wetherbyi, Fumonelix wetherbyi (Bland, 1873)
wheatleyi, Fumonelix wheatleyi (Bland, 1860)
wichitorum, Euchemotrema wichitorum Branson, 1972
yucatanea, Polygyra yucatanea (Morelet, 1849)
yucatanea helictomphala, Polygyra yucatanea helictomphala Pfeiffer, 1856 - syn of: Polygyra yucatanea (Morelet, 1849)
zaletus, Mesodon zaletus Binney, 1837
zelatus, Mesodon zelatus Binney, 1837 - syn of: Mesodon zaletus Binney, 1837
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