- aljarae, Chondrina farinesii aljarae C. Altimira, 1961 - (CHONDRINIDAE)
- Alkaites, Genus Alkaites Balini & al., 2006 (CERATITIDAE) (FOSSIL)
- alkmaarensis, Melanoides alkmaarensis M.M. Schepman, 1919 - (THIARIDAE)
- alkuonides, Amplirhagada alkuonides F. Köhler, 2011 - (CAMAENIDAE)
- Allaegopis, Genus Allaegopis F. Riedel, 1979 (ZONITIDAE)
- Allaginella, syn of: Genus Alaginella C.F. Laseron, 1957 (MARGINELLIDAE)
- allamandi, Conasprella allamandi (E.J. Petuch, 2013) - (CONIDAE)
- allamandi, Jaspidiconus allamandi E.J. Petuch, 2013 - syn of: Conasprella allamandi (E.J. Petuch, 2013) - (CONIDAE)
- allamanica, Vallonia allamanica D. Geyer, 1908 - syn of: Vallonia alamannica D. Geyer, 1908 - (VALLONIIDAE)
- allanae, Ruapukea allanae E.C. Smith, 1962 - (ACLIDIDAE)
- allanae, Coralastele allanae (T. Iredale, 1930) - (CALLIOSTOMATIDAE)
- allanae, Astele allanae (T. Iredale, 1930) - syn of: Coralastele allanae (T. Iredale, 1930) - (CALLIOSTOMATIDAE)
- allanae, Obanella allanae R.K. Dell, 1952 - (PUNCTIDAE)
- allanae, Phosinella allanae (C.F. Laseron, 1950) - (RISSOINIDAE)
- allanae, Rissoina allanae C.F. Laseron, 1950 - syn of: Phosinella allanae (C.F. Laseron, 1950) - (RISSOINIDAE)
- allanae proxima, Phosinella allanae proxima (C.F. Laseron, 1956) - (RISSOINIDAE)
- Allanassa, syn of: Genus Nassarius Dumιril, 1805 (NASSARIIDAE)
- allandalensis, Peruvispira allandalensis E.M. Fletcher, 1958 † - (GOSSELETINIDAE) (FOSSIL)
- allani, Amalda allani (Olson, 1956 †) - (ANCILLARIIDAE) (FOSSIL)
- allani, Austrofusus allani L. C. King, 1934 † - (BUCCINIDAE) (FOSSIL)
- allani, Pedinogyra hayii allani T. Iredale, 1937 - (CARYODIDAE)
- allani, Galeodea allani Finlay & J. Marwick, 1937 † - (CASSIDAE) (FOSSIL)
- allani, Paxula allani H.J. Finlay, 1928 - (COLUMBELLIDAE)
- allani, Zeatoma allani P.A. Maxwell, 1992 † - (CONOIDEA (UNASSIGNED)) (FOSSIL)
- allani, Falsicolus allani Finlay, 1930 † - (FASCIOLARIIDAE) (FOSSIL)
- allani, Priscoficus allani J. Marwick, 1960 † - (FICIDAE) (FOSSIL)
- allani, Mathilda allani P.A. Maxwell, 1966 † - (MATHILDIDAE) (FOSSIL)
- allani, Prototyphis allani (P.A. Maxwell, 1971 †) - (MURICIDAE) (FOSSIL)
- allani, Carinacca allani (J. Marwick, 1924 †) - (NATICIDAE) (FOSSIL)
- allani, Eutrephoceras allani C.A. Fleming, 1945 † - (NAUTILIDAE) (FOSSIL)
- allani, Sectipecten allani J. Marwick, 1928 † - (PECTINIDAE) (FOSSIL)
- allani, Perotrochus allani J. Marwick, 1928 † - (PLEUROTOMARIIDAE) (FOSSIL)
- allani, Psilomya allani Warren, 1933 † - (POROMYIDAE) (FOSSIL)
- allani, Comitas allani Powell, 1942 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- allani, Chondroceras allani (McLearn, 1928 †) - (SPHAEROCERATIDAE) (FOSSIL)
- allani, Tancredia allani J. Marwick, 1953 † - (TANCREDIIDAE) (FOSSIL)
- allani, Spinomelon allani J. Marwick, 1926 † - (VOLUTIDAE) (FOSSIL)
- Allanoceras, Genus Allanoceras Barskov, 1959 (SPYROCERATIDAE) (FOSSIL)
- allantayum, Aperostoma allantayum P. Bartsch & J.P.E. Morrison, 1942 - (NEOCYCLOTIDAE)
- allanthomsoni, Rhyssoplax allanthomsoni M.K. Mestayer, 1929 † - (CHITONIDAE) (FOSSIL)
- allantophora, Nuttallina allantophora W.H. Dall, 1919 - (LEPIDOCHITONIDAE)
- allardycei, Platyostoma allardycei A.H. Clarke, 1913 † - (PLATYCERATIDAE) (FOSSIL)
- allarense, Metophiceras allarense Dagys & Ermakova, 1996 † - syn of: Sakhaitoides allarensis (Dagys & Ermakova, 1996 †) - (XENODISCIDAE) (FOSSIL)
- allarensis, Sakhaitoides allarensis (Dagys & Ermakova, 1996 †) - (KASHMIRITIDAE) (FOSSIL)
- allarius, Oxychilus allarius (J.S. Miller, 1822) - (OXYCHILIDAE)
- allaryi, Amalda allaryi L. Bozzetti, 2007 - (ANCILLARIIDAE)
- allaryi, Cotonopsis allaryi L. Bozzetti, 2010 - (COLUMBELLIDAE)
- allaryi, Varioconus allaryi (L. Bozzetti, 2008) - (CONIDAE)
- allaryi, Chicoreus allaryi (R. Houart, P. Quiquandon & B. Briano, 2004) - (MURICIDAE)
- allaryi, Triplex allaryi R. Houart, P. Quiquandon & B. Briano, 2004 - syn of: Chicoreus allaryi (R. Houart, P. Quiquandon & B. Briano, 2004) - (MURICIDAE)
- allaryi, Fulgoraria allaryi (P. Bail, 2005) - (VOLUTIDAE)
- allaryi, Musashia allaryi P. Bail, 2005 - syn of: Fulgoraria allaryi (P. Bail, 2005) - (VOLUTIDAE)
- allasteri, Papuina allasteri J.C. Cox, 1873 - (CAMAENIDAE)
- Allatheca, Genus Allatheca Rozanov & al., 1969 (ALLATHECIDAE) (FOSSIL)
- ALLATHECIDAE Rozanov & al., 1969 - Family (HYOLITHA-ORTHOTHECIDA [Order]) (FOSSIL)
- allatollae, Charpentieria itala allatollae (F. Käufel, 1928) - (CLAUSILIIDAE)
- allaudi, Forresteria allaudi Boule & al., 1907 † - syn of: Forresteria alluaudi (Boule & al., 1907 †) - (COLLIGNONICERATIDAE) (FOSSIL)
- allecta, Arizonella allecta Stoyanow, 1948 † - (GOSSELETINIDAE) (FOSSIL)
- alleei, Aroapyrgus alleei J.P.E. Morrison, 1946 - (COCHLIOPIDAE)
- allegrettii, Zospeum allegrettii Conci, 1956 - syn of: Zospeum globosum L. Kušcer, 1928 - (ELLOBIIDAE)
- allei, Winchelloceras allei (Winchell, 1862 †) - (GIRTYOCERATIDAE) (FOSSIL)
- Alleinacin, Genus Alleinacin Squires & Ritterbush, 1981 (CARDIIDA (UNASSIGNED)) (FOSSIL)
- allemani, Daphnella allemani (P. Bartsch, 1931) - (RAPHITOMIDAE)
- allemani, Zebinella allemani (P. Bartsch, 1931) - (RISSOINIDAE)
- allemanicum, Goniatites allemanicum Maurer, 1896 † - syn of: Holzapfeloceras allemanicum (Maurer, 1896 †) - (GONIATITIDAE) (FOSSIL)
- allemanicum, Holzapfeloceras allemanicum (Maurer, 1896 †) - (SOBOLEWIIDAE) (FOSSIL)
- allemanicus, Aphyllites allemanicus Maurer, 1896 † - syn of: Holzapfeloceras allemanicum (Maurer, 1896 †) - (MIMOCERATIDAE) (FOSSIL)
- allenae, Calliostoma allenae (T. Iredale, 1930) - syn of: Coralastele allanae (T. Iredale, 1930) - (CALLIOSTOMATIDAE)
- allendae, Tryonia allendae R. Hershler, H.P. Liu & J.J. Landye, 2011 - (COCHLIOPIDAE)
- alleneae, Cyphoma alleneae C.N. Cate, 1973 - (OVULIDAE)
- Allenella, syn of: Genus Allentula Iredale, 1958 (PUNCTIDAE)
- alleni, Galadistes alleni T. Iredale, 1943 - (CAMAENIDAE)
- alleni, Hemitrochus alleni C.G. Aguayo & M.L. Jaume, 1957 - (CEPOLIDAE)
- alleni, Cerion alleni C. de la Torre in H.A. Pilsbry, 1929 - (CERIONIDAE)
- alleni, Miamira alleni (T.M. Gosliner, 1996) - (CHROMODORIDIDAE)
- alleni, Conus alleni J.R. Hendricks & R. Portell, 2008 † - (CONIDAE) (FOSSIL)
- alleni, Myonera alleni J. Poutiers & F.R. Bernard, 1995 - (CUSPIDARIIDAE)
- alleni, Cuspidaria alleni J.A. Allen & R.E. Morgan, 1981 - syn of: Myonera alleni J. Poutiers & F.R. Bernard, 1995 - (CUSPIDARIIDAE)
- alleni, Erosaria alleni J.M. Ostergaard, 1950 - syn of: Naria ostergaardi (W.H. Dall, 1921) - (CYPRAEIDAE)
- alleni, Margaritifera alleni É.A.A. Locard, 1889 - syn of: Margaritifera margaritifera (C. Linnaeus, 1758) - (MARGARITIFERIDAE)
- alleni, Neilonella alleni K. Amano & B.W. Jenkins, 2017 † - (NEILONELLIDAE) (FOSSIL)
- alleni, Nucinella alleni E.H. Vokes, 1966 † - (NUCINELLIDAE) (FOSSIL)
- alleni, Meganuculana alleni K. Amano & B.W. Jenkins, 2017 † - (NUCULANIDAE) (FOSSIL)
- alleni, Omphalotrochus alleni E.L. Yochelson, 1956 † - (OMPHALOTROCHIDAE) (FOSSIL)
- alleni, Neohelix albolabris alleni (F.A. Sampson, 1883) - (POLYGYRIDAE)
- alleni, Opisthosiphon alleni P. Bartsch, 1946 - (POMATIIDAE)
- alleni, Chondropoma canescens alleni C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- alleni, Spathoderma alleni A.H. Scheltema & D. Ivanov, 2000 - (PROCHAETODERMATIDAE)
- alleni, Silicula alleni F.R. Bernard, 1989 - (SILICULIDAE)
- alleni, Pisidium alleni V. Sterki, 1912 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- alleni, Gulella alleni B. Verdcourt, 1974 - (STREPTAXIDAE)
- alleni, Thyasira alleni F. Carrozza, 1981 - (THYASIRIDAE)
- alleni, Tetrentodon alleni (C. de la Torre, 1929) - (UROCOPTIDAE)
- alleni, Yoldiella alleni M. Huber, 2010 - (YOLDIIDAE)
- alleni madama, Cerion alleni madama M.I. Sánchez Roig, 1951 - syn of: Cerion madama M.I. Sánchez Roig, 1951 - (CERIONIDAE)
- alleni migueleti, Cerion alleni migueleti M.I. Sánchez Roig, 1951 - syn of: Cerion migueleti M.I. Sánchez Roig, 1951 - (CERIONIDAE)
- alleni providentialis, Opisthosiphon alleni providentialis P. Bartsch, 1946 - (POMATIIDAE)
- alleni sanchezi, Cerion alleni sanchezi W.J. Clench & C.G. Aguayo, 1953 - syn of: Cerion sanchezi W.J. Clench & C.G. Aguayo, 1953 - (CERIONIDAE)
- alleniana, Discula polymorpha alleniana C.de Paiva, 1866 - (HYGROMIIDAE)
- alleniana, Anodonta alleniana J. Da Silva e Castro, 1883 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- allenianus, Unio allenianus É.A.A. Locard, 1899 - syn of: Unio abrantesianus É.A.A. Locard, 1899 - (UNIONIDAE)
- Allenicordia, syn of: Genus Lyonsiella G.O. Sars, 1872 (LYONSIELLIDAE)
- Allenineaera, Subgenus Cuspidaria (Allenineaera) O.A. Scarlato & Y.I. Starobogatov, 1983 (CUSPIDARIIDAE)
- Allenineara, syn of: Genus Cuspidaria G.D. Nardo, 1840 (CUSPIDARIIDAE)
- allenmanae, Ficus allenmanae DeVries, 1997 † - (FICIDAE) (FOSSIL)
- Allenoconcha, Subgenus Microcystis (Allenoconcha) H.B. Preston, 1913 (EUCONULIDAE)
- Allentula, Genus Allentula Iredale, 1958 (PUNCTIDAE)
- Alleorus, Subgenus Discopsis (Alleorus) A. Strong, 1938 (TORNIDAE)
- Allepithema, Genus Allepithema J.R. le B. Tomlin, 1931 (ASSIMINEIDAE)
- alleri, Urocoptis alleri C. de la Torre, 1930 - (UROCOPTIDAE)
- allerii, Solarium allerii G. Seguenza, 1876 - syn of: Solatisonax alleryi (G. Seguenza, 1876) - (ARCHITECTONICIDAE)
- Allerisma, syn of: Genus Allorisma King, 1844 (EDMONDIIDAE) (FOSSIL)
- allermonti, Rissoa allermonti F. Nordsieck, 1972 - syn of: Rissoa similis A. Scacchi, 1836 - (RISSOIDAE)
- Allerya, syn of: Genus Discus L.I. Fitzinger, 1833 (DISCIDAE)
- Allerya, syn of: Genus Williamia T.A. de M. Monterosato, 1884 (SIPHONARIIDAE)
- alleryana, Payraudeautia alleryana G.R. Sulliotti, 1889 - syn of: Euspira intricata (E. Donovan, 1804) - (NATICIDAE)
- alleryana, Polinices alleryana G.R. Sulliotti, 1889 - syn of: Euspira intricata (E. Donovan, 1804) - (NATICIDAE)
- alleryana, Raphitoma alleryana G.R. Sulliotti, 1889 - syn of: Raphitoma bofilliana (G.R. Sulliotti, 1889) - (RAPHITOMIDAE)
- alleryanum, Cochlostoma alleryanum M. Paulucci, 1879 - (COCHLOSTOMATIDAE)
- alleryi, Solatisonax alleryi (G. Seguenza, 1876) - (ARCHITECTONICIDAE)
- alleryi, Chrysallida alleryi W. Kobelt, 1903 - syn of: Parthenina monterosatii (S. Clessin, 1900) - (PYRAMIDELLIDAE)
- alleryi, Evalea alleryi F. Nordsieck, 1972 - syn of: Ondina scandens (T.A. de M. Monterosato, 1884) - (PYRAMIDELLIDAE)
- alleryi, Rissoa alleryi (F. Nordsieck, 1972) - (RISSOIDAE)
- alleryi coeni, Chrysallida alleryi coeni G.S. Coen, 1937 - syn of: Spiralinella incerta (K.O. Milaschewitsch, 1916) - (PYRAMIDELLIDAE)
- allevata, Turritoma allevata J. Perner, 1907 † - (EOTOMARIIDAE) (FOSSIL)
- allevata, Murchisonia allevata J. Perner, 1907 † - (MURCHISONIIDAE) (FOSSIL)
- alleyrianum, Cochlostoma alleyrianum M. Paulucci, 1879 - syn of: Cochlostoma alleryanum M. Paulucci, 1879 - (COCHLOSTOMATIDAE)
- alli, Cryptopecten alli W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - syn of: Cryptopecten bullatus (P. Dautzenberg & A.R.J.B. Bavay, 1912) - (PECTINIDAE)
- alliandorum, Alcithoe alliandorum P. Bouchet & G.T. Poppe, 1988 - syn of: Alcithoe aillaudorum P. Bouchet & G.T. Poppe, 1988 - (VOLUTIDAE)
- alliariformis, Aegopinella alliariformis É.A.A. Locard, 1899 - syn of: Aegopinella nitens (A. Michaud, 1831) - (ZONITIDAE)
- alliarius, Helix alliarius J.S. Miller, 1822 - syn of: Oxychilus allarius (J.S. Miller, 1822) - (HELICIDAE)
- alliarius, Oxychilus alliarius J.S. Miller, 1822 - syn of: Oxychilus allarius (J.S. Miller, 1822) - (OXYCHILIDAE)
- alliciens, Crossea alliciens J.C. Melvill, 1910 - (CROSSEOLIDAE)
- allifordense, Lioceratoides allifordense McLearn, 1930 † - (HILDOCERATIDAE) (FOSSIL)
- alligans, Sagda alligans (L.A. Reeve, 1851) - (SAGDIDAE)
- alligans, Borysthenia alligans (W.A. Lindholm, 1927) - (VALVATIDAE)
- alligata, Raulinia alligata (G.P. Deshayes, 1832 †) - (AMATHINIDAE) (FOSSIL)
- alligata, Horologica alligata A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- alligata, Mitra alligata J.L.M. Defrance, 1824 † - (MITRIDAE) (FOSSIL)
- Alligaticeras, Genus Alligaticeras Buckman, 1923 (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- alligator, Phalium alligator E.J. Petuch, 1991 - syn of: Semicassis granulata (I. von Born, 1778) - (CASSIDAE)
- alligator, Siphocypraea alligator E.J. Petuch, 1994 † - (CYPRAEIDAE) (FOSSIL)
- alligatum, Alligaticeras alligatum (Leckenby) † - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- alligatus, Joculator alligatus A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- allingense, Bythiospeum allingense (S. Clessin, 1877) - (HYDROBIIDAE)
- allioni, Conus allioni Michelotti, 1847 † - (CONIDAE) (FOSSIL)
- allioni, Peristernia allioni (O.G. Michelotti, 1847 †) - (FASCIOLARIIDAE) (FOSSIL)
- allioni, Nautilus allioni O.G. Michelotti, 1840 † - (NAUTILIDAE) (FOSSIL)
- allioni, Trochus allioni Stoppani, 1858 † - syn of: Coelostylina conica (Münster, 1841 †) - (TROCHIDAE) (FOSSIL)
- allionii, Drillia allionii L.M.D. Bellardi, 1877 † - (DRILLIIDAE) (FOSSIL)
- alliouagana, Anachis alliouagana (M.J. Faber, 2004) - (COLUMBELLIDAE)
- alliouagana, Nassarina alliouagana M.J. Faber, 2004 - syn of: Anachis alliouagana (M.J. Faber, 2004) - (COLUMBELLIDAE)
- allisa, Achatina allisa L.A. Reeve, 1849 - (ACHATINIDAE)
- Allisma, syn of: Genus Pupinella J.E. Gray, 1850 (PUPINIDAE)
- allisoni, Plicatomytilus allisoni A.I. Kafanov, 1985 † - (MYTILIDAE) (FOSSIL)
- allisoni, Truncacila allisoni R.L. Squires & Saul, 2006 † - (NUCULIDAE) (FOSSIL)
- allisoni, Pleurotomella allisoni H.A. Rehder & H.S. Ladd, 1973 - (RAPHITOMIDAE)
- allisoni, Wyattella allisoni O.S. Adegoke, 1967 † - (TURRITELLIDAE) (FOSSIL)
- allisoni, Tylostoma allisoni R.L. Squires & Saul, 2004 † - (TYLOSTOMATIDAE) (FOSSIL)
- allisoni, Chione allisoni L.G. Hertlein & J. Grant, 1972 - syn of: Chione californiensis (W.J. Broderip, 1835) - (VENERIDAE)
- allisoni, Chione allisoni L.G. Hertlein & Grant, 1972 - syn of: Chione californiensis (W.J. Broderip, 1835) - (VENERIDAE)
- alliteratum, Glyphostoma alliteratum C. Hedley, 1915 - (CLATHURELLIDAE)
- allium, Tonna allium (L.W. Dillwyn, 1817) - (TONNIDAE)
- allium hardyi, Tonna allium hardyi L. Bozzetti & M. Ferrario, 2005 - (TONNIDAE)
- allixi, Grandipatula allixi (A.E.M. Cossmann, 1906 †) - (GRANDIPATULIDAE) (FOSSIL)
- allixi, Helix allixi A.E.M. Cossmann, 1906 † - syn of: Grandipatula allixi (A.E.M. Cossmann, 1906 †) - (HELICIDAE) (FOSSIL)
- allixi, Alvania allixi A.E.M. Cossmann, 1919 † - (RISSOIDAE) (FOSSIL)
- Allixia, syn of: Genus Pelycidion P. Fischer, 1873 (PELYCIDIIDAE)
- allo, Taranis allo (F.P. Jousseaume, 1934) - (RAPHITOMIDAE)
- Allo, syn of: Genus Taranis J.G. Jeffreys, 1870 (RAPHITOMIDAE)
- allobroga, Campylostylus allobroga P. Oppenheim, 1892 † - (THIARIDAE) (FOSSIL)
- allobrogense, Hammatoceras allobrogense Dumortier, 1874 † - (HAMMATOCERATIDAE) (FOSSIL)
- allobrogensis, Tirnovella allobrogensis (Mazenot, 1939 †) - (NEOCOMITIDAE) (FOSSIL)
- Allobuchia, Genus Allobuchia Yu, 1983 (PTERIIDA (UNASSIGNED)) (FOSSIL)
- Alloceras, Genus Alloceras Zhuravleva, 1974 (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- Alloceratites, Genus Alloceratites Spath, 1934 (CERATITIDAE) (FOSSIL)
- Allocharopa, Genus Allocharopa T. Iredale, 1937 (CHAROPIDAE)
- Allochiton, Genus Allochiton Fucini, 1912 (ISCHNOCHITONIDAE) (FOSSIL)
- allochroa, Aplysia allochroa L.S.R. Bergh, 1908 - syn of: Aplysia parvula O.A.L. Mörch, 1863 - (APLYSIIDAE)
- Allochroa, Genus Allochroa C.M.F. Ancey, 1887 (ELLOBIIDAE)
- allochroida, Paralaoma allochroida (H.H. Suter, 1890) - (PUNCTIDAE)
- Allocinma, Genus Allocinma T.N. Annandale & B. Prashad, 1919 (BITHYNIIDAE)
- Alloclionites, Genus Alloclionites Spath , 1951 (STEINMANNITIDAE) (FOSSIL)
- Allocoptis, Genus Allocoptis F.G. Thompson, 1976 (UROCOPTIDAE)
- Allocoryphe, Subgenus Holospira (Allocoryphe) H.A. Pilsbry, 1946 (UROCOPTIDAE)
- Allocosmia, Genus Allocosmia Assmann, 1937 (HARPIDAE) (FOSSIL)
- allocostata, Mesocibota allocostata (P.G. Oliver & R. von Cosel, 1993) - (ARCIDAE)
- Allocotoceras, Genus Allocotoceras Teichert & Glenister, 1953 (ENDOCERATIDAE) (FOSSIL)
- Allocrioceras, Genus Allocrioceras Spath , 1926 (ANISOCERATIDAE) (FOSSIL)
- allodapum, Rhiglyphostoma allodapum W.P. Woodring, 1970 † - (CLATHURELLIDAE) (FOSSIL)
- Allodesma, Genus Allodesma Ulrich , 1894 (ALLODESMATIDAE) (FOSSIL)
- ALLODESMATIDAE Dall, 1895 - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-MODIOMORPHIDA [Order]-CYCLOCONCHACEA [Superf) (FOSSIL)
- Allodiscus, Genus Allodiscus H.A. Pilsbry, 1892 (CHAROPIDAE)
- Allodisens, syn of: Genus Allodiscus H.A. Pilsbry, 1892 (CHAROPIDAE)
- alloeotypus, Androgynoceras alloeotypus Trueman, 1919 † - (LIPAROCERATIDAE) (FOSSIL)
- Allogenes, Subgenus Oxychilus (Allogenes) G.P.L.K. Gude, 1911 (OXYCHILIDAE)
- alloginella, Volvarina alloginella J. Espinosa, L. Moro & J.A. Ortea, 2011 - (MARGINELLIDAE)
- Alloglossa, syn of: Genus Chondrina Reichenbach, 1828 (CHONDRINIDAE)
- alloglyptum, Crucibulum alloglyptum H.A. Pilsbry & A.A. Olsson, 1941 † - (CALYPTRAEIDAE) (FOSSIL)
- allognata, Helicina allognata I.H. Jonas, 1846 - syn of: Proserpina linguifera (C.B. Adams, 1839) - (HELICINIDAE)
- Allognathus, Genus Allognathus H.A. Pilsbry, 1888 (HELICIDAE)
- Allogona, Genus Allogona H.A. Pilsbry, 1939 (POLYGYRIDAE)
- Allogramma, Genus Allogramma W.H. Dall, 1903 (LYONSIELLIDAE)
- allohaemata, Epimenia allohaemata L. Salvini-Plawén, 1997 - (EPIMENIIDAE)
- alloia, Nesopupa alloia C.M. Cooke & H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- alloiodes, Palaeotachea alloiodes (Thomä, 1845) † - (HELICIDAE) (FOSSIL)
- Alloiodoris, Genus Alloiodoris L.S.R. Bergh, 1904 (DISCODORIDIDAE)
- alloiteaui, Cossmannella alloiteaui Tessier, 1952 † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- Allomactra, Genus Allomactra Tomlin, 1931 (MACTRIDAE) (FOSSIL)
- allomphalus, Solariorbis allomphalus H.A. Pilsbry & A.A. Olsson, 1952 - (TORNIDAE)
- allomyax, Tresus allomyax E.V. Coan & P.H. Valentich-Scott, 2000 - (MACTRIDAE)
- Allonautilus, Genus Allonautilus C.J. Ward & F.L. Saunders, 1997 (NAUTILIDAE)
- Allonychia, Genus Allonychia Ulrich, 1895 (AMBONYCHIIDAE) (FOSSIL)
- Allopagus, Genus Allopagus F. Stoliczka, 1871 (KELLIELLIDAE) (FOSSIL)
- Allopeas, Subgenus Lamellaxis (Allopeas) F.C. Baker, 1935 (SUBULINIDAE)
- allophyla, Inglisella allophyla P.A. Maxwell, 1988 † - (CANCELLARIIDAE) (FOSSIL)
- allophyla, Fasciculicardia allophyla P.A. Maxwell, 1992 † - (CARDITIDAE) (FOSSIL)
- Allopiloceras, Genus Allopiloceras Ulrich & Foerste, 1936 (PILOCERATIDAE) (FOSSIL)
- alloplocum, Gemmellaroceras alloplocum (C. Gemmellaro, 1884 †) - (POLYMORPHITIDAE) (FOSSIL)
- ALLOPOSIDAE Verrill, 1881 - Family (CEPHALOPODA-COLEOIDEA [Subclass]-OCTOPODIFORMES [Superorder]-OCTOPODA [Order]-INCIRRATA [Suborder]-ARGONAUTOIDEA [Superfamily])
- Alloposus, syn of: Genus Haliphron J.J.S. Steenstrup, 1859 (ALLOPOSIDAE)
- Alloptychites, syn of: Genus Isculites Renz & Renz, 1948 (PARAGOCERATIDAE) (FOSSIL)
- alloptyx, Thaumatoptyx alloptyx H. Nordsieck, 2003 - (CLAUSILIIDAE)
- Alloptyx, Subgenus Vertigo (Alloptyx) H.A. Pilsbry, 1953 (VERTIGINIDAE)
- allorenti, Laevichlamys allorenti (H.H. Dijkstra, 1988) - (PECTINIDAE)
- Allorisma, Genus Allorisma King, 1844 (EDMONDIIDAE) (FOSSIL)
- Allorossia, syn of: Genus Rossia R. Owen, 1834 (SEPIOLIDAE)
- Allostrophia, Genus Allostrophia Kittl, 1894 (ZYGOPLEURIDAE) (FOSSIL)
- Alloteuthis, Genus Alloteuthis G. Wόlker, 1920 (LOLIGINIDAE)
- Allothyra, Subgenus Binneya (Allothyra) H.A. Pilsbry, 1948 (BINNEYIDAE)
- Allotissotia, syn of: Genus Hemitissotia Wiedmann, 1979 (VASCOCERATIDAE) (FOSSIL)
- Allotrioceras, Genus Allotrioceras Flower, 1955 (ALLOTRIOCERATIDAE) (FOSSIL)
- ALLOTRIOCERATIDAE Flower, 1955 - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-ENDOCERIDA [Order]) (FOSSIL)
- allouarni, Torresitrachia allouarni F. Köhler, 2011 - (CAMAENIDAE)
- allporti, Calliostoma allporti (J.E. Tenison-Woods, 1876) - (CALLIOSTOMATIDAE)
- allporti, Dentimargo allporti (J.E. Tenison-Woods, 1876) - (MARGINELLIDAE)
- allporti, Circomphalus allporti J.E. Tenison-Woods, 1876 † - (VENERIDAE) (FOSSIL)
- alluaudi, Limicolaria alluaudi J. Germain, 1909 - (ACHATINIDAE)
- alluaudi, Macrochlamys alluaudi P. Dautzenberg & H. Fischer, 1905 - syn of: Macrochlamys despecta (J.F. Mabille, 1887) - (ARIOPHANTIDAE)
- alluaudi, Forresteria alluaudi (Boule & al., 1907 †) - (COLLIGNONICERATIDAE) (FOSSIL)
- alluaudi, Paradrillia alluaudi (P. Dautzenberg, 1932) - (HORAICLAVIDAE)
- alluaudi, Mutela alluaudi J. Germain, 1909 - (IRIDINIDAE)
- alluaudi, Leda alluaudi P. Dautzenberg & H. Fischer, 1897 - syn of: Yoldiella alluaudi (P. Dautzenberg & H. Fischer, 1897) - (NUCULANIDAE)
- alluaudi, Physa alluaudi P. Dautzenberg, 1908 - (PHYSIDAE)
- alluaudi, Tropidophora alluaudi P. Dautzenberg, 1894 - (POMATIIDAE)
- alluaudi, Pseudocorbicula alluaudi P. Dautzenberg, 1908 - syn of: Sphaerium nyanzae (E.A. Smith, 1892) - (SPHAERIIDAE)
- alluaudi, Edentulina alluaudi P. Dautzenberg, 1895 - syn of: Edentulina minor (P.M.A. Morelet, 1851) - (STREPTAXIDAE)
- alluaudi, Coelatura alluaudi (P. Dautzenberg, 1908) - (UNIONIDAE)
- alluaudi, Yoldiella alluaudi (P. Dautzenberg & H. Fischer, 1897) - (YOLDIIDAE)
- alluaudi ampozaloakaense, Forresteria alluaudi ampozaloakaense Basse, 1947 † - (COLLIGNONICERATIDAE) (FOSSIL)
- alluaudi pallida, Tropidophora alluaudi pallida P. Dautzenberg, 1894 - (POMATIIDAE)
- alluaudi saturata, Tropidophora alluaudi saturata P. Dautzenberg, 1894 - (POMATIIDAE)
- allumettense, Ormoceras allumettense Billings † - (ORMOCERATIDAE) (FOSSIL)
- Allumettoceras, Genus Allumettoceras Foerste, 1926 (TRIPTEROCERATIDAE) (FOSSIL)
- allungata, Megastomia allungata F. Nordsieck, 1972 - syn of: Megastomia alungata F. Nordsieck, 1972 - (PYRAMIDELLIDAE)
- ALLUROTEUTHIDAE - syn of Family: NEOTEUTHIDAE
- Alluroteuthis, Genus Alluroteuthis N.H. Odhner, 1923 (NEOTEUTHIDAE)
- alluvionica, Pupilla alluvionica S. Meng & M.H. Hoffmann, 2008 - (PUPILLIDAE)
- alluvionum, Cernuella alluvionum G. Servain, 1880 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- allynainus, Clathrodrillia allynainus L.G. Hertlein & A.M. Strong, 1951 - syn of: Clathrodrillia allyniana (L.G. Hertlein & A.M. Strong, 1951) - (DRILLIIDAE)
- allyneana, Mytilopsis allyneana L.G. Hertlein & G.D. Hanna, 1949 - syn of: Mytilopsis adamsi J.P.E. Morrison, 1946 - (DREISSENIDAE)
- allyni, Fusinus allyni J.H. McLean, 1970 - (FASCIOLARIIDAE)
- allyni, Immersidens allyni B. Roth & C.C. Christensen, 1984 - (GASTROCOPTIDAE)
- allyni, Tripoplax allyni (A. Ferreira, 1977) - (ISCHNOCHITONIDAE)
- allyni, Terebra allyni T. Bratcher, T.A. Burch & R.D. Burch, 1970 - (TEREBRIDAE)
- allyniana, Clathrodrillia allyniana (L.G. Hertlein & A.M. Strong, 1951) - (DRILLIIDAE)
- allyniana, Helminthoglypta allyniana S.S. Berry, 1920 - (HELMINTHOGLYPTIDAE)
- allyniana, Lepidochitona allyniana (H.A. Pilsbry & A.M. Strong, 1951) - (LEPIDOCHITONIDAE)
- allyniana, Vertigo allyniana S.S. Berry, 1919 - (VERTIGINIDAE)
- allynsmithi, Maricopella allynsmithi W.O. Gregg & W.B. Miller, 1969 - syn of: Sonorella allynsmithi (W.O. Gregg & W.B. Miller, 1969) - (CEPOLIDAE)
- allynsmithi, Sonorella allynsmithi (W.O. Gregg & W.B. Miller, 1969) - (HELMINTHOGLYPTIDAE)
- allynsmithi, Lepidozona allynsmithi A. Ferreira, 1974 - (ISCHNOCHITONIDAE)
- allynsmithi, Cuspivolva allynsmithi (C.N. Cate, 1978) - (OVULIDAE)
- alma, Helicarion alma T. Iredale, 1944 - (HELICARIONIDAE)
- alma, Pseudorhaphitoma alma (K.H.J. Thiele, 1925) - (MANGELIIDAE)
- alma, Bela alma K.H.J. Thiele, 1925 - (MANGELIIDAE)
- alma, Inquisitor alma K.H.J. Thiele, 1930 - syn of: Inquisitor lassulus C. Hedley, 1922 - (PSEUDOMELATOMIDAE)
- alma, Nisiturris alma (K.H.J. Thiele, 1925) - (PYRAMIDELLIDAE)
- alma, Dosinia alma T. Iredale, 1929 - syn of: Dosinia histrio J.F. Gmelin, 1791 - (VENERIDAE)
- alma extranea, Pardsinia alma extranea T. Iredale, 1937 - syn of: Dosinia extranea (T. Iredale, 1937) - (VENERIDAE)
- almaatina, Lymnaea almaatina Z.I. Izzatullaev, N.D. Kruglov & Y.I. Starobogatov, 1983 - (LYMNAEIDAE)
- almaatina, Polypylis almaatina Y.I. Starobogatov & Mamilova, 1970 - (PLANORBIDAE)
- almaatina, Sibirobythinella almaatina Z.I. Izzatullaev, T.Y. Sitnikova & Y.I. Starobogatov, 1985 - (POMATIOPSIDAE)
- almaatina lindholmi, Trichia almaatina lindholmi Skvortsov, 1940 - syn of: Fruticicola almaatini (Skvortsov, 1940) - (HYGROMIIDAE)
- almaatini, Fruticicola almaatini (Skvortsov, 1940) - (BRADYBAENIDAE)
- almaatini, Trichia almaatini Skvortsov, 1940 - syn of: Fruticicola almaatini (Skvortsov, 1940) - (HYGROMIIDAE)
- almadiensis, Gibberula almadiensis M. Pin & F. Boyer, 1995 - (CYSTISCIDAE)
- almae, Chloraea almae (O.F. von Möllendorff, 1890) - (BRADYBAENIDAE)
- almae, Isabellaria almae (O. Böttger, 1889) - (CLAUSILIIDAE)
- almae efthimia, Isabellaria almae efthimia (H. Nordsieck, 2015) - (CLAUSILIIDAE)
- almagrensis, Conus almagrensis Böse, 1910 † - (CONIDAE) (FOSSIL)
- almagrensis, Mitra almagrensis F. Toula, 1911 † - (MITRIDAE) (FOSSIL)
- almagrensis coralliophila, Mitra almagrensis coralliophila A.A. Olsson, 1922 † - (MITRIDAE) (FOSSIL)
- almalensis, Angiomphalia almalensis A.A. Schileyko & K.K. Uvalieva, 1978 - (HYGROMIIDAE)
- Almaloceras, Genus Almaloceras Zhuravleva, 1974 (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- almeida, Strophocheilus almeida J.B. von Spix, 1827 - syn of: Strophocheilus pudicus (O.F. Müller, 1774) - (STROPHOCHEILIDAE)
- almejasensis, Turbonilla almejasensis P. Bartsch, 1917 - (PYRAMIDELLIDAE)
- almelae, Theodoxus almelae (Revilla, 1958 †) - (NERITIDAE) (FOSSIL)
- almerai, Bithynia almerai J. Almera, 1894 † - (BITHYNIIDAE) (FOSSIL)
- almerai, Helix almerai É.A.A. Locard - syn of: Cornu aspersum (O.F. Müller, 1774) - (HELICIDAE)
- almerai, Melanopsis almerai A.E.M. Cossmann, 1909 † - (MELANOPSIDAE) (FOSSIL)
- almerai, Europrotomus almerai (J.C.H. Crosse, 1885 †) - (STROMBIDAE) (FOSSIL)
- almerai, Valvata almerai J. Almera, 1894 † - (VALVATIDAE) (FOSSIL)
- almgreeni, Macrotheca almgreeni Peel & E.L. Yochelson, 1984 † - (TRAPEZOVITIDAE) (FOSSIL)
- almiqui, Chondrothyra detectabilis almiqui M.I. Sánchez Roig, 1951 - (POMATIIDAE)
- almiranta, Anachis almiranta C. Hedley, 1915 - syn of: Zafra atrata (A.A. Gould, 1860) - (COLUMBELLIDAE)
- almirante, Placostylus almirante W.J. Clench, 1941 - (BOTHRIEMBRYONTIDAE)
- almirantensis, Siphocypraea almirantensis A.A. Olsson, 1922 † - (CYPRAEIDAE) (FOSSIL)
- almirantensis, Cyclopecten almirantensis A.A. Olsson, 1922 † - (PROPEAMUSSIIDAE) (FOSSIL)
- almissana, Medora almissana (H.C. Küster, 1847) - (CLAUSILIIDAE)
- almissana mariae, Medora almissana mariae H. Nordsieck, 1970 - (CLAUSILIIDAE)
- almissana schmidti, Medora almissana schmidti H. Nordsieck, 1970 - (CLAUSILIIDAE)
- Almites, Genus Almites Toumansky , 1941 (MARATHONITIDAE) (FOSSIL)
- almo, Gibberula almo (P. Bartsch, 1915) - (CYSTISCIDAE)
- almo, Diala almo (P. Bartsch, 1915) - (DIALIDAE)
- almo, Obtortio almo P. Bartsch, 1915 - syn of: Diala almo (P. Bartsch, 1915) - (DIASTOMATIDAE)
- almo, Eulima almo (P. Bartsch, 1917) - (EULIMIDAE)
- almo, Bullia almo P. Bartsch, 1915 - syn of: Bullia digitalis (L.W. Dillwyn, 1817) - (NASSARIIDAE)
- almo, Turbonilla almo W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- almo, Alvania almo (P. Bartsch, 1911) - (RISSOIDAE)
- almo, Manzonia almo P. Bartsch, 1911 - syn of: Alvania almo (P. Bartsch, 1911) - (RISSOIDAE)
- almoetianum, Arieticeras almoetianum Fucini, 1931 † - syn of: Arieticeras algovianum (Oppel, 1862 †) - (HILDOCERATIDAE) (FOSSIL)
- almogravensis, Theba pisana almogravensis D.T. Holyoak & G.A. Holyoak, 2016 - (HELICIDAE)
- Almohadites, Genus Almohadites Wiedmann, 1966 (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- almolaense, Crussoliceras almolaense Oloriz, Schairer & Zeiss, 1985 † - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- almonte, Helix almonte H.B. Tristram, 1863 - syn of: Trichodiscina suturalis pressula (P.M.A. Morelet, 1851) - (HELICIDAE)
- almuhambetovae, Pupilla almuhambetovae Prysjazhnjuk, 2017 † - (PUPILLIDAE) (FOSSIL)
- almyris, Margarella almyris A. de Rochebrune & J.F. Mabille, 1885 - syn of: Margarella violacea (P.P. King & W.J. Broderip, 1832) - (CALLIOSTOMATIDAE)
- Alnifia, Genus Alnifia Termier, 1950 (PTERIIDA (UNASSIGNED)) (FOSSIL)
- alnorbismelleus, Planorbis alnorbismelleus A. Lutz, 1918 - syn of: Drepanotrema lucidum (L. Pfeiffer, 1839) - (PLANORBIDAE)
- aloagana, Isomeria aloagana F.P. Jousseaume, 1887 - (CAMAENIDAE)
- aloba, Pyrgulopsis aloba R. Hershler, 1999 - (HYDROBIIDAE)
- alobata, Tornia alobata (Sobolew, 1914 †) - (KIRSOCERATIDAE) (FOSSIL)
- alobatum, Retrotornoceras alobatum House, 2002 † - (TORNOCERATIDAE) (FOSSIL)
- alobatum, Tornoceras alobatum Sobolew, 1914 † - syn of: Tornia alobata (Sobolew, 1914 †) - (TORNOCERATIDAE) (FOSSIL)
- alocatus, Murex alocatus V. Robillard, 1873 - syn of: Pterynotus barclayanus (C.B. Adams, 1873) - (MURICIDAE)
- Alocaxis, Genus Alocaxis Cossmann, 1889 (TRYPANAXIDAE) (FOSSIL)
- Alocinma, syn of: Genus Gabbia G.W. Tryon, 1865 (BITHYNIIDAE)
- Alococoncha, Genus Alococoncha Pojeta & Gilbert-Tomlinson, 1977 (CTENODONTIDAE) (FOSSIL)
- Alocolytoceras, Genus Alocolytoceras Pompeckj, 1896 (LYTOCERATIDAE) (FOSSIL)
- Aloconatica, syn of: Genus Stigmaulax O.A.L. Mφrch, 1852 (NATICIDAE)
- Aloconcha, syn of: Genus Alococoncha Pojeta & Gilbert-Tomlinson, 1977 (CTENODONTIDAE) (FOSSIL)
- Alocospira, Subgenus Amalda (Alocospira) A.E.M. Cossmann, 1899 (ANCILLARIIDAE)
- alofa, Mitrella alofa (C. Hedley, 1899) - (COLUMBELLIDAE)
- aloha, Achatinella apexfulva aloha H.A. Pilsbry & C.M. Cooke, 1914 - (ACHATINELLIDAE)
- aloicola, Sheldonia aloicola (Melvill & Ponsonby, 1890) - (UROCYCLIDAE)
- Aloides, syn of: Genus Corbula J.G. Bruguiθre, 1797 (CORBULIDAE)
- Aloidis, syn of: Genus Corbula J.G. Bruguiθre, 1797 (CORBULIDAE)
- aloisii, Eostrobilops aloisii Manganelli, Delle Cave & Giusti, 1989 † - (STROBILOPSIDAE) (FOSSIL)
- alokiza, Eumitra alokiza (J.E. Tenison-Woods, 1880 †) - (MITRIDAE) (FOSSIL)
- alomprae, Euthriofusus alomprae E.W. Vredenburg, 1923 † - (FASCIOLARIIDAE) (FOSSIL)
- alonensis, Acavus alonensis A.E.J. Férussac, 1821 - syn of: Iberus alonensis (A.E.J. Férussac, 1821) - (ACAVIDAE)
- alonensis, Iberus alonensis (A.E.J. Férussac, 1821) - (HELICIDAE)
- alonensis, Iberus alonensis A. Schmidt, 1857 - syn of: Iberus alonensis (A.E.J. Férussac, 1821) - (HELICIDAE)
- alonensis labiatus, Iberus alonensis labiatus J. Galindo, 2016 - (HELICIDAE)
- alonensis mariae, Iberus alonensis mariae C. Cobos, 1979 - syn of: Iberus gualtieranus mariae (C. Cobos, 1979) - (HELICIDAE)
- alonensis ornatissimus, Iberus alonensis ornatissimus C. Cobos, 1979 - (HELICIDAE)
- alonsoae, Bythinella alonsoae M. Bech, 1979 - syn of: Bythinella batalleri A. Bofill, 1925 - (BYTHINELLIDAE)
- alonsoi, Cabrieroceras alonsoi Montesinos, 1988 † - (WERNEROCERATIDAE) (FOSSIL)
- alontinum, Calliphylloceras alontinum (C. Gemmellaro, 1884 †) - (PHYLLOCERATIDAE) (FOSSIL)
- alonzensis, Nipteraxis alonzensis J.M. Pacaud, 2017 † - (ARCHITECTONICIDAE) (FOSSIL)
- alope, Pododesmus alope J.E. Gray, 1850 - syn of: Pododesmus macrochisma (G.P. Deshayes, 1839) - (ANOMIIDAE)
- Alopia, Genus Alopia H. Adams & A. Adams, 1855 (CLAUSILIIDAE)
- alopioides, Obscurella alopioides P. Fagot, 1885 - syn of: Cochlostoma martorelli montsiccianum (A. Bofill, 1890) - (COCHLOSTOMATIDAE)
- alopis, Venus alopis Š. Brusina, 1870 - syn of: Timoclea ovata (T. Pennant, 1777) - (VENERIDAE)
- alopsis, Venus alopsis Š. Brusina, 1870 - syn of: Timoclea ovata (T. Pennant, 1777) - (VENERIDAE)
- Alora, Genus Alora H. Adams & A. Adams, 1853 (EPITONIIDAE)
- alouatta, Sanguinolaria alouatta A.A. Olsson, 1922 † - (PSAMMOBIIDAE) (FOSSIL)
- alouina, Volema alouina P.F. Röding, 1798 - syn of: Mancinella alouina (P.F. Röding, 1798) - (MELONGENIDAE)
- alouina, Mancinella alouina (P.F. Röding, 1798) - (MURICIDAE)
- Aloysia, syn of: Genus Pterosoma R.P. Lesson, 1827 (CARINARIIDAE)
- aloysia, Columbellaria aloysia Guirand & Ogérien, 1865 † - (COLOMBELLINIDAE) (FOSSIL)
- aloysii, Pseudotorinia aloysii (R. Selli, 1973) - (ARCHITECTONICIDAE)
- aloysii, Clanculus aloysii J.E. Tenison-Woods, 1876 - (TROCHIDAE)
- aloysiisabaudiae, Gynnarion aloysiisabaudiae (C. Pollonera, 1906) - (UROCYCLIDAE)
- alpanensis, Hercoglossa alpanensis Rouchadze, 1938 † - syn of: Palelialia alpanensis (Rouchadze, 1938 †) - (HERCOGLOSSIDAE) (FOSSIL)
- alpanensis, Palelialia alpanensis (Rouchadze, 1938 †) - (PSEUDONAUTILIDAE) (FOSSIL)
- alpani, Yvaniella alpani Karacabey † - (HIPPURITIDAE) (FOSSIL)
- alpatyevensis, Tyrnoviella alpatyevensis A.V. Guzhov, 2004 † - (CRYPTAULACIDAE) (FOSSIL)
- alpaus, Ocenebra alpaus A. De Gregorio, 1885 - syn of: Ocinebrina edwardsi (B.C.M. Payraudeau, 1826) - (MURICIDAE)
- alpecanus, Unio alpecanus J.R. Bourguignat, 1882 - syn of: Unio tumidus A. Retzius, 1788 - (UNIONIDAE)
- Alpenoceras, Genus Alpenoceras Foerste, 1927 (DISCOSORIDAE) (FOSSIL)
- alpestre, Zospeum alpestre (C. Freyer, 1855) - (ELLOBIIDAE)
- alpestre bolei, Zospeum alpestre bolei R. Slapnik, 1991 - (ELLOBIIDAE)
- alpestre kupitzense, Zospeum alpestre kupitzense B. Stummer, 1984 - (ELLOBIIDAE)
- alpestre likanum, Zospeum alpestre likanum J. Bole, 1960 - (ELLOBIIDAE)
- alpestris, Pitys alpestris C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- alpestris, Acicula alpestris W. Kobelt, 1894 - syn of: Acicula lineolata N. Pini, 1884 - (ACICULIDAE)
- alpestris, Quadriplicata alpestris H. Nordsieck, 1975 - (CLAUSILIIDAE)
- alpestris, Helix alpestris E.A. Rossmässler, 1837 - syn of: Arianta arbustorum alpicola (A.E.J. Férussac, 1821) - (HELICIDAE)
- alpestris, Belgrandiella alpestris (G.R. von Frauenfeld, 1863) - (HYDROBIIDAE)
- alpestris, Petasina unidentata alpestris (S. Clessin, 1878) - (HYGROMIIDAE)
- alpestris, Lehmannia alpestris M. Lessona & C. Pollonera, 1882 - syn of: Lehmannia rupicola M. Lessona & C. Pollonera, 1884 - (LIMACIDAE)
- alpestris, Cincinna alpestris H.C. Küster, 1852 - (VALVATIDAE)
- alpestris, Vertigo alpestris J. Alder, 1838 - (VERTIGINIDAE)
- alpestris uturyotoensis, Vertigo alpestris uturyotoensis J.T. Kuroda & M. Hukuda, 1944 - (VERTIGINIDAE)
- alpeus, Iglica alpeus A. Reischütz & P.L. Reischütz, 2004 - (HYDROBIIDAE)
- alpha, Austrofusus alpha Finlay, 1926 † - (BUCCINIDAE) (FOSSIL)
- alpha, Fusocranchia alpha L.M.A.O.E. Joubin, 1920 - syn of: Liocranchia reinhardtii (J.J.S. Steenstrup, 1856) - (CRANCHIIDAE)
- alpha, Pleuropoma laciniosa alpha H.A. Pilsbry & C.M. Cooke, 1908 - (HELICINIDAE)
- alpha, Aoteadrillia alpha (L. C. King, 1933 †) - (HORAICLAVIDAE) (FOSSIL)
- alpha, Hydrobia alpha E. Jekelius, 1944 † - (HYDROBIIDAE) (FOSSIL)
- alpha, Mysella alpha A.W.B. Powell, 1937 - (MONTACUTIDAE)
- alpha, Assytilus alpha Berezovsky, 2015 † - (MYTILIDAE) (FOSSIL)
- alpha, Pecten alpha W.H. Dall, 1898 † - (PECTINIDAE) (FOSSIL)
- alpha, Pectinodonta alpha B. A. Marshall, Puillandre, Lambourdière, Couloux & Samadi, 2016 - (PECTINODONTIDAE)
- alpha, Eulimella alpha C.R. Laws, 1938 † - (PYRAMIDELLIDAE) (FOSSIL)
- alpha, Onoba alpha (A.W.B. Powell, 1955) - (RISSOIDAE)
- alpha, Roxania alpha (M.K. Mestayer, 1921 †) - (SCAPHANDRIDAE) (FOSSIL)
- alpha, Lissotestella alpha (C.R. Laws, 1939 †) - (SEGUENZIOIDEA (UNASSIGNED)) (FOSSIL)
- alpha, Catriona alpha M.C. Miller, 1977 - (TRINCHESIIDAE)
- alpha, Trinchesia alpha (K. Baba & I. Hamatani, 1963) - (TRINCHESIIDAE)
- alpha, Taia lanaonis alpha (P. Bartsch, 1907) - (VIVIPARIDAE)
- alphacentauri, Kimberleytrachia alphacentauri F. Köhler, 2011 - (CAMAENIDAE)
- alphacordatum, Cardioceras alphacordatum Spath, 1939 † - (CARDIOCERATIDAE) (FOSSIL)
- alphaeus, Gomphoceras alphaeus Barrande, 1860 † - syn of: Ovocerina alphaeus (Barrande, 1860 †) - (DIESTOCERATIDAE) (FOSSIL)
- alphaeus, Ovocerina alphaeus (Barrande, 1860 †) - (MANDALOCERATIDAE) (FOSSIL)
- alphalautus, Euhoplites alphalautus (Spath 1925 †) - (HOPLITIDAE) (FOSSIL)
- alpharhipaeum, Phillipsoceras alpharhipaeum Ruzhentsev & Bogoslovskaya, 1975 † - (RETICULOCERATIDAE) (FOSSIL)
- alphesboei, Amphithalamus alphesboei J.C. Melvill, 1912 - (ANABATHRIDAE)
- alphesiboei, Rissoa alphesiboei J.C. Melvill, 1912 - syn of: Iravadia ictriella (J.C. Melvill, 1910) - (RISSOIDAE)
- alpheus, Tremanotus alpheus J.W. Hall, 1868 † - syn of: Tremanotus angustata (J.W. Hall, 1852 †) - (BUCANIIDAE) (FOSSIL)
- alpheus, Raphica alpheus A. Reischütz & P.L. Reischütz, 2004 - (HYDROBIIDAE)
- alpheus, Callistoctopus alpheus (M.D. Norman, 1993) - (OCTOPODIDAE)
- alpheus, Octopus alpheus M.D. Norman, 1993 - syn of: Callistoctopus alpheus (M.D. Norman, 1993) - (OCTOPODIDAE)
- alphonsi, Cryptoconus alphonsi (Briart & Cornet, 1871 †) - (CONIDAE) (FOSSIL)
- alphonsi, Helix alphonsi G.P. Deshayes, 1870 - syn of: Sinicola alphonsi (G.P. Deshayes, 1870) - (HELICIDAE)
- alphonsi, Sinicola alphonsi (G.P. Deshayes, 1870) - (PLECTOPYLIDAE)
- alphonsi, Besla alphonsi E. Saurin, 1959 - (PYRAMIDELLIDAE)
- alphonsi, Zetela alphonsi C. Vilvens, 2002 - (SOLARIELLIDAE)
- alphonsi, Spelaeoconcha paganettii alphonsi W.J.M. Maassen, 1989 - (VERTIGINIDAE)
- alphonsiana, Columbella alphonsiana R.P.J. Hervier, 1900 - syn of: Mitromorpha alphonsiana (R.P.J. Hervier, 1900) - (COLUMBELLIDAE)
- alphonsiana, Mitromorpha alphonsiana (R.P.J. Hervier, 1900) - (MITROMORPHIDAE)
- alphonsianum, Etrema alphonsianum (R.P.J. Hervier, 1896) - (CLATHURELLIDAE)
- alphonsianum, Glyphostoma alphonsianum R.P.J. Hervier, 1896 - syn of: Etrema alphonsianum (R.P.J. Hervier, 1896) - (CLATHURELLIDAE)
- alphonsinae, Rhyssoplax alphonsinae (A. de Rochebrune, 1884) - (CHITONIDAE)
- alpica, Protorugosa alpica (T. Iredale, 1943) - (RHYTIDIDAE)
- alpicola, Andraea dubia alpicola S. Clessin, 1887 - (CLAUSILIIDAE)
- alpicola, Jaminia alpicola M. von Kimakowicz, 1890 - (ENIDAE)
- alpicola, Arianta arbustorum alpicola (A.E.J. Férussac, 1821) - (HELICIDAE)
- alpicola, Trichia alpicola (L. Eder, 1921) - (HYGROMIIDAE)
- alpicola, Pupilla alpicola J.G.F. de Charpentier, 1837 - (PUPILLIDAE)
- alpicola, Pisidium alpicola H.H. Suter, 1889 - syn of: Pisidium subtruncatum A.W. Malm, 1855 - (SPHAERIIDAE)
- alpicola, Pisidium alpicola S. Clessin, 1890 - syn of: Pisidium lilljeborgi S. Clessin, 1886 - (SPHAERIIDAE)
- alpillense, Bythiospeum diaphanum alpillense H. Girardi, 2009 - (HYDROBIIDAE)
- alpillensis, Subthurmannia alpillensis (Mazenot †) - (NEOCOMITIDAE) (FOSSIL)
- alpina, Boiotremus fortis alpina (Spitz, 1907 †) - (BUCANIIDAE) (FOSSIL)
- alpina, Cardiolopsis alpina Stache in Heritsch, 1929 † - (CARDIOLIDAE) (FOSSIL)
- alpina, Flammulina alpina H.H. Suter, 1904 - (CHAROPIDAE)
- alpina, Cyclonenia alpina H. Nordsieck, 1999 - (CLAUSILIIDAE)
- alpina, Charpentieria alpina G. Stabile, 1859 - syn of: Charpentieria dyodon thomasiana (H.C. Küster, 1850) - (CLAUSILIIDAE)
- alpina, Alopia glorifica alpina R. von Kimakowicz, 1933 - (CLAUSILIIDAE)
- alpina, Pyrostoma badia alpina H. Nordsieck, 2006 - (CLAUSILIIDAE)
- alpina, Pustularia alpina K.E.I. von Eichwald, 1851 † - (CYPRAEIDAE) (FOSSIL)
- alpina, Eucyclus alpina F. Stoliczka, 1861 † - (EUCYCLIDAE) (FOSSIL)
- alpina, Bicarina coluber alpina (Spitz, 1907 †) - (GOSSELETINIDAE) (FOSSIL)
- alpina, Hamulina alpina A.V.M.D. D'Orbigny, 1850 † - syn of: Acanthoptychoceras alpinum A.V.M.D. D'Orbigny, 1850 † - (HAMULINIDAE) (FOSSIL)
- alpina, Helix alpina Menetries, 1832 - syn of: Caucasigena armeniaca (L. Pfeiffer, 1846) - (HELICIDAE)
- alpina, Radix alpina C. Pollonera, 1889 - syn of: Radix labiata (E.A. Rossmässler, 1835) - (LYMNAEIDAE)
- alpina, Melanopsis ancillaroides alpina F. Traub, 1938 † - (MELANOPSIDAE) (FOSSIL)
- alpina, Hologyra alpina E.F.R.K. Koken, 1892 † - (NATICOPSIDAE) (FOSSIL)
- alpina, Nerita alpina Klipstein, 1843 † - syn of: Dentineritaria neritina (Münster, 1841 †) - (NERITIDAE) (FOSSIL)
- alpina, Nuculana alpina H. Winkler, 1859 † - (NUCULANIDAE) (FOSSIL)
- alpina, Oreohelix alpina (M.J. Elrod, 1901) - (OREOHELICIDAE)
- alpina, Phanerotrema labrosa alpina Spitz, 1907 † - (PHANEROTREMATIDAE) (FOSSIL)
- alpina, Pholadomya alpina Mathéron, 1842 † - (PHOLADOMYIDAE) (FOSSIL)
- alpina, Pseudoplacunopsis alpina (H. Winkler, 1859 †) - (PLICATULIDAE) (FOSSIL)
- alpina, Sanguinolaria alpina Münster, 1841 † - syn of: Posidonia wengensis Wissmann, 1841 † - (PSAMMOBIIDAE) (FOSSIL)
- alpina, Barroisocaulus davyi alpina (Spitz, 1907 †) - (PTYCHOCAULIDAE) (FOSSIL)
- alpina, Strioturbonilla alpina (F. Sacco, 1890) - (PYRAMIDELLIDAE)
- alpina, Hemitissotia alpina Wiedmann, 1979 † - (VASCOCERATIDAE) (FOSSIL)
- alpina, Phenacolimax alpina P. Hesse, 1923 - syn of: Eucobresia nivalis (F. Dumont & L.L.G. de Mortillet, 1852) - (VITRINIDAE)
- alpina, Vitrina alpina P.V. Gredler, 1856 - syn of: Vitrina pellucida (O.F. Müller, 1774) - (VITRINIDAE)
- alpina, Aegopinella alpina F. Dumont & L.L.G. de Mortillet, 1856 - syn of: Aegopinella minor (G. Stabile, 1864) - (ZONITIDAE)
- alpinella, Euxinella alpinella I. Dedov, 2011 - (CLAUSILIIDAE)
- alpini, Exesilla alpini (J.W. Brazier, 1877) - (PYRAMIDELLIDAE)
- Alpinipupina, Genus Alpinipupina Stanisic, 2010 (PUPINIDAE)
- Alpinites, Genus Alpinites Bogoslovsky , 1971 (POSTTORNOCERATIDAE) (FOSSIL)
- alpinum, Acanthoptychoceras alpinum A.V.M.D. D'Orbigny, 1850 † - (ANCYLOCERATIDAE) (FOSSIL)
- alpinum, Barrancyloceras alpinum (A.V.M.D. D'Orbigny, 1850 †) - (CRIOCERATITIDAE) (FOSSIL)
- alpinum, Crioceras alpinum A.V.M.D. D'Orbigny, 1850 † - syn of: Barrancyloceras alpinum (A.V.M.D. D'Orbigny, 1850 †) - (CRIOCERATITIDAE) (FOSSIL)
- alpinum, Protacrioceras ornatum alpinum Sarkar, 1955 † - (EMERICICERATIDAE) (FOSSIL)
- alpinum, Chilostoma alpinum (A.E.J. Férussac, 1821) - (HELICIDAE)
- alpinum, Chilostoma fontenillii alpinum (A. Michaud, 1831) - (HELICIDAE)
- alpinum, Bythiospeum alpinum R. Bernasconi, 1988 - (HYDROBIIDAE)
- alpinum, Phylloceras alpinum A.V.M.D. D'Orbigny † - (PHYLLOCERATIDAE) (FOSSIL)
- alpinum, Pisidium alpinum N.H. Odhner, 1938 - syn of: Pisidium tenuilineatum A. Stelfox, 1918 - (SPHAERIIDAE)
- alpinus, Arion alpinus C. Pollonera, 1887 - syn of: Arion intermedius N.A.J. Normand, 1852 - (ARIONIDAE)
- alpinus, Limax alpinus A.E.J. Férussac, 1822 - (LIMACIDAE)
- alpinus, Macroscaphites alpinus (A.V.M.D. D'Orbigny, 1850 †) - (MACROSCAPHITIDAE) (FOSSIL)
- alpinus, Scaphites alpinus A.V.M.D. D'Orbigny, 1850 † - syn of: Macroscaphites alpinus (A.V.M.D. D'Orbigny, 1850 †) - (SCAPHITIDAE) (FOSSIL)
- alpinus, Schizodus alpinus J.W. Hall, 1858 † - (SCHIZODIDAE) (FOSSIL)
- alpinus, Obtusopyrgus alpinus M. Haase, 2008 - (TATEIDAE)
- alrici, Orobophana alrici (J.C.H. Crosse, 1894) - (HELICINIDAE)
- alrobini, Conus alrobini (N.N. Thach, 2016) - (CONIDAE)
- alsatica, Grandipatula alsatica Joos, 1918 † - (GRANDIPATULIDAE) (FOSSIL)
- alsatica, Grandipatula alsatica (Jooss, 1918) † - (GRANDIPATULIDAE) (FOSSIL)
- alsatica, Homomya alsatica (A.E.R. Agassiz, 1842 †) - (PHOLADOMYIDAE) (FOSSIL)
- alsatica, Trigonia alsatica (Rollier, 1912 †) - (TRIGONIIDAE) (FOSSIL)
- alsaticus, Zonites alsaticus Joos, 1918 † - syn of: Grandipatula alsatica Joos, 1918 † - (ZONITIDAE) (FOSSIL)
- alsatiorum, Omphaloptycha alsatiorum E.A.L. Kittl, 1899 † - (COELOSTYLINIDAE) (FOSSIL)
- Alsatites, Genus Alsatites Haug , 1894 (ARIETITIDAE) (FOSSIL)
- alschingeri, Semirugata bilabiata alschingeri (J.G.F. de Charpentier, 1852) - (CLAUSILIIDAE)
- alseria, Anodonta alseria H. Drouët, 1883 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- alsiosus, Cryptoconus alsiosus (A. Brongniart, 1823 †) - (CONIDAE) (FOSSIL)
- Alsobia, syn of: Subgenus Amphorella (Fusillus) R.T. Lowe, 1852 (FERUSSACIIDAE)
- Alsolemia, Subgenus Ptychodon (Alsolemia) F.M. Climo, 1981 (CHAROPIDAE)
- alsophila, Epiphragmophora alsophila (R.A. Philippi, 1867) - (EPIPHRAGMOPHORIDAE)
- alsophilus, Drymaeus alsophilus R.A. Philippi, 1867 - (BULIMULIDAE)
- Alstadenites, Subgenus Barroisiceras (Alstadenites) Reeside, 1932 (COLLIGNONICERATIDAE) (FOSSIL)
- alta, Larochella alta A.W.B. Powell, 1927 - (ACLIDIDAE)
- alta, Anatoma alta (R.B. Watson, 1886) - (ANATOMIDAE)
- alta, Anatoma alta R.B. Watson, 1886 - syn of: Anatoma alta (R.B. Watson, 1886) - (ANATOMIDAE)
- alta, Angaria alta P. Morris & J. Lycett, 1851 † - (ANGARIIDAE) (FOSSIL)
- alta, Lacunospira alta Batten, 1958 † - (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- alta, Archinacella alta Wahlman, 1992 † - (ARCHINACELLIDAE) (FOSSIL)
- alta, Tylopoma alta (Papaianopol & Macale?, 2006 †) - (BITHYNIIDAE) (FOSSIL)
- alta, Bohaispira alta Youlou, 1978 † - (BOHAISPIRIDAE) (FOSSIL)
- alta, Solenosteira alta E.J. Petuch, 1994 † - (BUCCINIDAE) (FOSSIL)
- alta, Plicolumna inscendens alta (W.H. Dall, 1893) - (BULIMULIDAE)
- alta, Calyptraea alta (T.A. Conrad, 1854 †) - (CALYPTRAEIDAE) (FOSSIL)
- alta, Trochita alta F.W. Hutton, 1885 † - syn of: Sigapatella terraenovae A.J. Peile, 1924 † - (CALYPTRAEIDAE) (FOSSIL)
- alta, Sigapatella alta N.H. Odhner, 1924 - syn of: Sigapatella novaezelandiae (R.P. Lesson, 1831) - (CALYPTRAEIDAE)
- alta, Crepidula alta Seeley, 1861 † - syn of: Crepidula gaultina alta (Seeley, 1861 †) - (CALYPTRAEIDAE) (FOSSIL)
- alta, Crepidula gaultina alta (Seeley, 1861 †) - (CALYPTRAEIDAE) (FOSSIL)
- alta, Amplirhagada alta G.A. Solem, 1981 - (CAMAENIDAE)
- alta, Capulus alta J.B.M. Dana, 1849 † - syn of: Rhabdocantha alta (J.B.M. Dana, 1849 †) - (CAPULIDAE) (FOSSIL)
- alta, Nihonia alta C. Nielsen, 2003 † - (COCHLESPIRIDAE) (FOSSIL)
- alta, Crassatella alta T.A. Conrad, 1832 † - (CRASSATELLIDAE) (FOSSIL)
- alta, Ctenodonta alta J.W. Hall † - (CTENODONTIDAE) (FOSSIL)
- alta, Cucullaea alta Sowerby, 1846 † - (CUCULLAEIDAE) (FOSSIL)
- alta, Rhinoclama alta (J.C. Verco, 1908) - (CUSPIDARIIDAE)
- alta, Congeria alta Š. Brusina, 1989 † - (DREISSENIDAE) (FOSSIL)
- alta, Eopteria alta T. Kobayashi, 1933 † - (EOPTERIIDAE) (FOSSIL)
- alta, Falsicolus alta (P. Marshall, 1919 †) - (FASCIOLARIIDAE) (FOSSIL)
- alta, Diodora alta (C.B. Adams, 1852) - (FISSURELLIDAE)
- alta, Stegocoelia alta Licharev, 1975 † - (GONIASMATIDAE) (FOSSIL)
- alta, Hampilina alta Kobayashi, 1958 † - (HELCIONELLIDAE) (FOSSIL)
- alta, Alcadia alta (G.B. Sowerby, 1866) - (HELICINIDAE)
- alta, Kirengella alta (R.P. Whitfield, 1889 †) - (KIRENGELLIDAE) (FOSSIL)
- alta, Liarea hochstetteri alta A.W.B. Powell, 1954 - (LIAREIDAE)
- alta, Laevilitorina alta (A.W.B. Powell, 1940) - (LITTORINIDAE)
- alta, Notoacmea alta W.R.B. Oliver, 1926 - (LOTTIIDAE)
- alta, Gonimyrtea alta J. Marwick, 1965 † - (LUCINIDAE) (FOSSIL)
- alta, Lanx alta (G.W. Tryon, 1865) - (LYMNAEIDAE)
- alta, Radix alta Macale?, 2000 † - (LYMNAEIDAE) (FOSSIL)
- alta, Mactra alta G.P. Deshayes, 1855 - (MACTRIDAE)
- alta, Tambanella alta H. Guo, 1985 † - (MALLEIDAE) (FOSSIL)
- alta, Dentimargo alta (R.B. Watson, 1886) - (MARGINELLIDAE)
- alta, Metoptoma alta R.P. Whitfield, 1889 † - syn of: Kirengella alta (R.P. Whitfield, 1889 †) - (METOPTOMATIDAE) (FOSSIL)
- alta, Modiomorpha alta (T.A. Conrad, 1841 †) - (MODIOMORPHIDAE) (FOSSIL)
- alta, Trophon alta Wood, 1842 † - (MURICIDAE) (FOSSIL)
- alta, Ocenebra alta W.H. Dall, 1890 - syn of: Favartia cellulosa (T.A. Conrad, 1846) - (MURICIDAE)
- alta, Favartia alta W.H. Dall, 1890 - syn of: Favartia cellulosa (T.A. Conrad, 1846) - (MURICIDAE)
- alta, Myophoria alta W.M. Gabb, 1864 † - syn of: Guineana alta (W.M. Gabb, 1864 †) - (MYOPHORIIDAE) (FOSSIL)
- alta, Nuculopsis alta Termier & Termier, 1959 † - (NUCULIDAE) (FOSSIL)
- alta, Peronina alta H.P. Plate, 1893 - (ONCHIDIIDAE)
- alta, Hypergonia alta J. Donald 1892 † - (ORTHONEMIDAE) (FOSSIL)
- alta, Chlamys alta (L.A. Reeve, 1853) - (PECTINIDAE)
- alta, Pectinodonta alta M.M. Schepman, 1908 - (PECTINODONTIDAE)
- alta, Siliqua alta (W.J. Broderip & G.B. I Sowerby, 1829) - (PHARIDAE)
- alta, Atrina alta G.B. Sowerby, 1835 - syn of: Cyrtopinna seminuda (J.B.P.A. Lamarck, 1819) - (PINNIDAE)
- alta, Ancylastrum alta H.A. Pilsbry & C.E. Beecher, 1927 - (PLANORBIDAE)
- alta, Rhabdocantha alta (J.B.M. Dana, 1849 †) - (PLATYCERATIDAE) (FOSSIL)
- alta, Cecina alta L.A. Prozorova, 1996 - (POMATIOPSIDAE)
- alta, Liopistha alta (F.A. Roemer, 1852 †) - (POROMYIDAE) (FOSSIL)
- alta, Schistoloma alta P. Bartsch - (PUPINIDAE)
- alta, Turbonilla alta S. Clessin, 1902 - (PYRAMIDELLIDAE)
- alta, Basilissa alta R.B. Watson, 1879 - syn of: Hadroconus altus (R.B. Watson, 1879) - (SEGUENZIIDAE)
- alta, Callomphala alta C.F. Laseron, 1954 - syn of: Callomphala lucida (A. Adams & G.F. Angas, 1864) - (SKENEIDAE)
- alta, Psammotreta obesa alta (T.A. Conrad, 1837) - (TELLINIDAE)
- alta, Thracia alta Lutkevitch & Lobanova, 1960 † - syn of: Myomedia carinata (Morris, 1845 †) - (THRACIIDAE) (FOSSIL)
- alta, Thyasira alta A.E. Verrill & K.J. Bush, 1898 - (THYASIRIDAE)
- alta, Guineana alta (W.M. Gabb, 1864 †) - (TRIGONIIDAE) (FOSSIL)
- alta, Gregoia alta Fehse, 2017 - (TRIVIIDAE)
- alta, Parasyrinx alta (G.F. Harris, 1897 †) - (TURRIDAE) (FOSSIL)
- alta, Diplodonta alta W.H. Dall, 1890 † - (UNGULINIDAE) (FOSSIL)
- alta, Valvata alta G.P. Deshayes, 1862 † - (VALVATIDAE) (FOSSIL)
- alta, Cyprimeria alta T.A. Conrad, 1875 † - (VENERIDAE) (FOSSIL)
- alta, Gouldia alta W.H. Dall, 1903 † - (VENERIDAE) (FOSSIL)
- alta, Dosinia alta (R.W. Dunker, 1849) - (VENERIDAE)
- alta, Adelomelon alta (Sowerby, 1846 †) - (VOLUTIDAE) (FOSSIL)
- alta, Voluta alta R.A. Philippi, 1887 † - syn of: Adelomelon curiniancui C. Nielsen, 2003 † - (VOLUTIDAE) (FOSSIL)
- alta acanthica, Angaria alta acanthica W.H. Hudleston † - (ANGARIIDAE) (FOSSIL)
- alta bicarinata, Angaria alta bicarinata W.H. Hudleston † - (ANGARIIDAE) (FOSSIL)
- alta crystalla, Amplirhagada alta crystalla G.A. Solem, 1981 - (CAMAENIDAE)
- alta intermedia, Amplirhagada alta intermedia G.A. Solem, 1981 - (CAMAENIDAE)
- alta oxytoma, Basilissa alta oxytoma R.B. Watson, 1879 - syn of: Hadroconus altus (R.B. Watson, 1879) - (SEGUENZIIDAE)
- alta sibuyanica, Schistoloma alta sibuyanica P. Bartsch, 1915 - (PUPINIDAE)
- altacostatum, Hornyzyga altacostatum (Tassell, 1982 †) - (PALAEOZYGOPLEURIDAE) (FOSSIL)
- Altadema, Genus Altadema Kues, 2002 (MURCHISONIIDAE) (FOSSIL)
- altadema, Altadema altadema Mazaev, 2003 † - (MURCHISONIIDAE) (FOSSIL)
- altaica, Kirchneriella altaica (Murchison & al., 1845 †) - (GOSSELETINIDAE) (FOSSIL)
- altaica, Ginella altaica C. Chen & al., 1981 † - (HELCIONELLIDAE) (FOSSIL)
- altaica, Lindholmomneme altaica (C.A. Westerlund, 1896) - (HYGROMIIDAE)
- altaica, Pupilla altaica S. Meng & M.H. Hoffmann, 2008 - (PUPILLIDAE)
- altaica, Novisuccinea altaica (E.C. Von Martens, 1871) - (SUCCINEIDAE)
- altaica, Cincinna altaica Popova & Y.I. Starobogatov, 1981 † - (VALVATIDAE) (FOSSIL)
- Altaicola, syn of: Genus Chilanodon C.A. Westerlund, 1897 (HYGROMIIDAE)
- ALTAICORNIDAE Sysoev, 1970 - Family (HYOLITHA-HYOLITHIDA [Order]) (FOSSIL)
- altaicum, Stroggyloceras altaicum P.A. Zhuravleva, 1972 † - syn of: Sophoceras strenuum P.A. Zhuravleva, 1972 † - (DISCOSORIDA (unassigned)) (FOSSIL)
- altaicum, Ponticeras altaicum Bogoslovsky, 1958 † - (PONTICERATIDAE) (FOSSIL)
- altaicum, Neopisidium altaicum L.V. Krivosheina, 1979 - syn of: Pisidium subtruncatum A.W. Malm, 1855 - (SPHAERIIDAE)
- altaicus, Agriolimax altaicus H.R. Simroth, 1886 - (AGRIOLIMACIDAE)
- altaicus, Crickites altaicus Bogoslovsky, 1958 † - (GEPHUROCERATIDAE) (FOSSIL)
- altaicus, Diallagites altaicus (Bogoslovsky, 1958 †) - (WERNEROCERATIDAE) (FOSSIL)
- altaicus transitorius, Agriolimax altaicus transitorius H.W. Waldén, 1957 - syn of: Agriolimax altaicus H.R. Simroth, 1886 - (AGRIOLIMACIDAE)
- Altaipecten, Genus Altaipecten Yang & Chen, 1985 (PTERIIDA (UNASSIGNED)) (FOSSIL)
- altamirai, Suboestophora altamirai A. Ortiz De Zárate, 1962 - syn of: Suboestophora altimirai (A. Ortiz De Zárate, 1962) - (HYGROMIIDAE)
- altapex, Syrnola altapex A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- altarata, Aelga altarata L. Krishtofovich, 1957 † - (PERIPLOMATIDAE) (FOSSIL)
- Altarianta, syn of: Genus Arianta W.E. Leach in W.H. Turton, 1831 (HELICIDAE)
- altaspira, Crisilla perminima altaspira F. Nordsieck, 1972 - (RISSOIDAE)
- Altaspiratella, Genus Altaspiratella Korobkov, 1966 (LIMACINIDAE) (FOSSIL)
- altaspissus, Crassatella altaspissus W.P. Woodring, 1925 † - (CRASSATELLIDAE) (FOSSIL)
- altatae, Olivella altatae J.Q. Burch & G.B. Campbell, 1963 - (OLIVELLIDAE)
- altavillae, Cancellaria altavillae (I. Libassi, 1859 †) - (CANCELLARIIDAE) (FOSSIL)
- altavillense, Cardium altavillense A.E.M. Cossmann & G. Pissarro † - (CARDIIDAE) (FOSSIL)
- altavillensis, Craspedochiton altavillensis Seguenza, 1876 † - (ACANTHOCHITONIDAE) (FOSSIL)
- altavillensis, Bicorbula altavillensis (J.L.M. Defrance, 1818 †) - (CORBULIDAE) (FOSSIL)
- altavillensis, Epitonium altavillensis M.E.A. de Boury † - (EPITONIIDAE) (FOSSIL)
- altavillensis, Tectonatica burtoni altavillensis E. Robba, Pedriali & E. Quaggiotto, 2016 † - (NATICIDAE) (FOSSIL)
- altavillensis, Tomostoma altavillensis A.E.M. Cossmann & G. Pissarro † - (NERITIDAE) (FOSSIL)
- altavillensis, Scaphander altavillensis G.P. Deshayes, 1861 † - (SCAPHANDRIDAE) (FOSSIL)
- altavillensis, Turritella altavillensis A.E.M. Cossmann & G. Pissarro † - (TURRITELLIDAE) (FOSSIL)
- altavillensis neritoides, Tomostoma altavillensis neritoides G.P. Deshayes, 1825 † - (NERITIDAE) (FOSSIL)
- altayensis, Kochia altayensis Yang, 1983 † - (KOCHIIDAE) (FOSSIL)
- altdorfensis, Belemnopsis altdorfensis H.M.D. de Blainville, 1825 † - syn of: Belemnites beaumontianus A.V.M.D. D'Orbigny, 1842 † - (BELEMNOPSEIDAE) (FOSSIL)
- alte, Eleutherocaulis alte (A.E.J. Férussac, 1821) - (VERONICELLIDAE)
- altecara, Parthenina altecara Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- altecarinatus, Gevanites altecarinatus Parnes, 1975 † - (HUNGARITIDAE) (FOSSIL)
- altecarinatus, Viviparus altecarinatus Š. Brusina, 1874 † - (VIVIPARIDAE) (FOSSIL)
- altecinctum, Tragolytoceras altecinctum J. Von Hauer, 1866 † - (LYTOCERATIDAE) (FOSSIL)
- altecostata, Albinaria caerulea altecostata (L. Pfeiffer, 1866) - (CLAUSILIIDAE)
- altemontanus, Sphaerocyclus altemontanus Spitz, 1907 † - (BELLEROPHONTIDAE) (FOSSIL)
- altemontanus, Collina altemontanus Spitz, 1907 † - (DACTYLIOCERATIDAE) (FOSSIL)
- altena, Calliostoma altena J. Knudsen, 1970 - (CALLIOSTOMATIDAE)
- Altenaeum, Genus Altenaeum G. Spaink, 1972 (MONTACUTIDAE)
- altenai, Drymaeus altenai A.S.H. Breure, 1976 - (BULIMULIDAE)
- altenai, Rhinoclavis altenai G.G. Wissema, 1947 † - syn of: Indocerithium taeniatum (J.R.C. Quoy & J.P. Gaimard, 1834 †) - (CERITHIIDAE) (FOSSIL)
- altenai, Indocerithium altenai G.G. Wissema, 1947 † - syn of: Indocerithium taeniatum (J.R.C. Quoy & J.P. Gaimard, 1834 †) - (CERITHIIDAE) (FOSSIL)
- altenai, Chelyconus altenai A.W. Janssen, 1972 † - (CONIDAE) (FOSSIL)
- altenai, Cuspidaria altenai J. Knudsen, 2005 - (CUSPIDARIIDAE)
- altenai, Fusiturricula altenai O. Macsotay & B. Campos, 2001 † - syn of: Fusiturricula springvaleensis (W.C. Mansfield, 1925 †) - (DRILLIIDAE) (FOSSIL)
- altenai, Imparietula altenai E. Gittenberger, 1967 - (ENIDAE)
- altenai, Xerotricha altenai L. Gasull, 1974 - syn of: Xerotricha vatonniana (J.R. Bourguignat, 1877) - (HYGROMIIDAE)
- altenai, Limax altenai A.V. Grossu & D. Lupu, 1960 - syn of: Limax maximus C. Linnaeus, 1758 - (LIMACIDAE)
- altenai, Mangelia altenai Brackman, 1938 - syn of: Mangelia costulata A. Risso, 1826 - (MANGELIIDAE)
- altenai, Paphies altenai (L.A. de Rooij-Schuiling, 1972) - (MESODESMATIDAE)
- altenai, Milax altenai L. Forcart, 1972 - (MILACIDAE)
- altenai, Theodoxus altenai (H. Schütt, 1965) - (NERITIDAE)
- altenai, Arcopsis altenai C. Beets, 1986 † - (NOETIIDAE) (FOSSIL)
- altenai, Knefastia altenai O. Macsotay & B. Campos, 2001 - (PSEUDOMELATOMIDAE)
- altenai, Pyrgiscus altenai J.J. Van Aartsen & J.X. Corgan, 1996 - (PYRAMIDELLIDAE)
- altenai, Alvania altenai J.J. Van Aartsen, H.P.M.G. Menkhorst & E. Gittenberger, 1984 - syn of: Alvania tomentosa (P.M. Pallary, 1920) - (RISSOIDAE)
- altenai, Rissoina altenai C. Beets, 1942 † - (RISSOINIDAE) (FOSSIL)
- altenai, Thracia altenai M. Glibert & L. van de Poel, 1966 † - (THRACIIDAE) (FOSSIL)
- altenai, Dosinia altenai E. Fischer-Piette & D. Delmas, 1967 - syn of: Dosinia circularis A. Römer, 1862 - (VENERIDAE)
- altenai, Gouldia altenai E. Fischer-Piette, M. Kempf & A.M. Testud, 1970 - syn of: Gouldia cerina (Adams, 1845) - (VENERIDAE)
- altenai, Xylopholas altenai H. Turner, 1972 - (XYLOPHAGAIDAE)
- Altenaia, Genus Altenaia A. Zilch, 1972 (CERASTUIDAE)
- altenburgensis, Faustina altenburgensis (E.E. Binder, 1977 †) - (HELICIDAE) (FOSSIL)
- altenburgensis, Klikia altenburgensis E.E. Binder, 1977 † - syn of: Faustina altenburgensis (E.E. Binder, 1977 †) - (HELICIDAE) (FOSSIL)
- altenburgensis, Turbonilla altenburgensis H.B. Geinitz, 1848 † - (PYRAMIDELLIDAE) (FOSSIL)
- altenense, Physodoceras altenense (A.V.M.D. D'Orbigny, 1848 †) - (ASPIDOCERATIDAE) (FOSSIL)
- Alteniella, Subgenus Cernuella (Alteniella) J.P.M. Clerx & E. Gittenberger, 1977 (HYGROMIIDAE)
- alter, Kittlistylus alter F. Haas, 1953 † - (EULIMIDAE) (FOSSIL)
- alter, Chumazites alter Ruzhencev & Bogoslovskaya, 1978 † - (RHYMMOCERATIDAE) (FOSSIL)
- alter, Prostacheoceras alter Leonova, 1989 † - (VIDRIOCERATIDAE) (FOSSIL)
- altera, Holopella altera J. Perner, 1903 † - (LOXONEMATIDAE) (FOSSIL)
- altera, Sinistracirsa altera (J. Perner, 1903 †) - (ONYCHOCHILIDAE) (FOSSIL)
- altera, Donaldia altera J. Perner, 1903 † - syn of: Sinistracirsa altera (J. Perner, 1903 †) - (ONYCHOCHILIDAE) (FOSSIL)
- altera, Limarca altera (G.P. Deshayes, 1858 †) - (PHILOBRYIDAE) (FOSSIL)
- altera, Bertinella altera (G.P. Deshayes, 1857 †) - (TELLINIDAE) (FOSSIL)
- alteralbus, Monophorus alteralbus E. Rolán, 1994 - syn of: Monophorus ateralbus E. Rolán & R. Fernández-Garcés, 1994 - (TRIPHORIDAE)
- alterammonoides, Proptychites alterammonoides (Krafft, 1909 †) - (PROPTYCHITIDAE) (FOSSIL)
- alterans, Monia alterans (Sowerby, 1846 †) - (ANOMIIDAE) (FOSSIL)
- alterata, Aelga alterata L. Krishtofovich, 1957 † - syn of: Aelga altarata L. Krishtofovich, 1957 † - (PERIPLOMATIDAE) (FOSSIL)
- alterna, Westraltrachia alterna T. Iredale, 1939 - (CAMAENIDAE)
- alterna, Platyclymenia alterna B.W. Jenkins, 1968 † - (PLATYCLYMENIIDAE) (FOSSIL)
- alternans, Mantelliceras alternans M. Collignon, 1964 † - syn of: Mantelliceras mantelli (J. de C. Sowerby, 1814 †) - (ACANTHOCERATIDAE) (FOSSIL)
- alternans, Acrochordiceras alternans Smith, 1914 † - syn of: Acrochordiceras hyatti F.B. Meek, 1877 † - (ACROCHORDICERATIDAE) (FOSSIL)
- alternans, Aphanitoma alternans Nordsieck, 1972 † - (BORSONIIDAE) (FOSSIL)
- alternans, Drymaeus alternans H.H. Beck, 1837 - syn of: Mesembrinus translucens alternans (H.H. Beck, 1837) - (BULIMULIDAE)
- alternans, Mesembrinus translucens alternans (H.H. Beck, 1837) - (BULIMULIDAE)
- alternans, Amoeboceras alternans (von Buch, 1831 †) - (CARDIOCERATIDAE) (FOSSIL)
- alternans, Cystiscus alternans (G.B. Pritchard & J.H. Gatliff, 1899) - (CYSTISCIDAE)
- alternans, Dentalium alternans M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1891 - syn of: Antalis inaequicostata (P. Dautzenberg, 1891) - (DENTALIIDAE)
- alternans, Epirobia swiftiana alternans F.G. Thompson, 1976 - (EPIROBIIDAE)
- alternans, Provermicularia alternans (Böhm, 1895 †) - (EULIMIDAE) (FOSSIL)
- alternans, Corongoceras alternans (Gerth, 1925 †) - (HIMALAYITIDAE) (FOSSIL)
- alternans, Lophospira alternans E.F.R.K. Koken & J. Perner, 1925 † - (LOPHOSPIRIDAE) (FOSSIL)
- alternans, Marginella alternans G.B. Pritchard & J.H. Gatliff, 1899 - syn of: Cystiscus alternans (G.B. Pritchard & J.H. Gatliff, 1899) - (MARGINELLIDAE)
- alternans, Nerita alternans R. Tate, 1876 † - (NERITIDAE) (FOSSIL)
- alternans, Cyrtoceras alternans (Tietze, 1870 †) - (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- alternans, Lopha alternans Cragin, 1893 † - (OSTREIDAE) (FOSSIL)
- alternans, Pecten alternans Münster, 1841 † - syn of: Pecten subalternans d'Orbigny, 1849 † - (PECTINIDAE) (FOSSIL)
- alternans, Philine alternans J. van der Linden, 1995 - (PHILINIDAE)
- alternans, Avicula alternans Münster, 1841 † - (PTERIIDAE) (FOSSIL)
- alternans, Pseudodaphnella alternans (E.A. Smith, 1882) - (RAPHITOMIDAE)
- alternans, Raphitoma alternans (T.A. de M. Monterosato, 1884) - (RAPHITOMIDAE)
- alternans, Pleurotoma alternans E.A. Smith, 1882 - syn of: Pseudodaphnella alternans (E.A. Smith, 1882) - (TURRIDAE)
- alternans, Cochlodinella alternans C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- alternans honduranus, Drymaeus alternans honduranus L. Pfeiffer, 1846 - syn of: Mesembrinus hondurasanus (L. Pfeiffer, 1846) - (BULIMULIDAE)
- alternans juquilensis, Drymaeus alternans juquilensis H.A. Pilsbry, 1899 - syn of: Mesembrinus translucens juquilensis H.A. Pilsbry, 1899 - (BULIMULIDAE)
- alternata, Opisthoptera alternata Ulrich, 1895 † - (AMBONYCHIIDAE) (FOSSIL)
- alternata, Calloarca alternata (G.B. I Sowerby, 1833) - (ARCIDAE)
- alternata, Barbatia alternata (G.B. I Sowerby, 1833) - syn of: Calloarca alternata (G.B. I Sowerby, 1833) - (ARCIDAE)
- alternata, Siphonalia alternata R.A. Philippi, 1847 - syn of: Austrofusus fontainei (A.V.M.D. D'Orbigny, 1841) - (BUCCINIDAE)
- alternata, Cancellaria alternata T.A. Conrad, 1834 † - (CANCELLARIIDAE) (FOSSIL)
- alternata, Agnocardia alternata (Hubbard, 1920 †) - (CARDIIDAE) (FOSSIL)
- alternata, Clathropsis alternata (C.F. Laseron, 1951) - (CERITHIOPSIDAE)
- alternata, Horologica alternata A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- alternata, Chromodoris alternata (R.F. Burn, 1957) - (CHROMODORIDIDAE)
- alternata, Zafra alternata (A.A. Gould, 1860) - (COLUMBELLIDAE)
- alternata, Cardiomya alternata (A.V.M.D. D'Orbigny, 1853) - (CUSPIDARIIDAE)
- alternata, Anguispira alternata (T. Say, 1816) - (DISCIDAE)
- alternata, Fissurella alternata T. Say, 1822 - syn of: Diodora cayenensis J.B.P.A. Lamarck, 1822 - (FISSURELLIDAE)
- alternata, Flabellina alternata J.A. Ortea & J. Espinosa, 1998 - (FLABELLINIDAE)
- alternata, Haliotis alternata G.B. II Sowerby, 1882 - syn of: Haliotis rugosa J.B.P.A. Lamarck, 1822 - (HALIOTIDAE)
- alternata, Nuttallina alternata (G.B. Sowerby, 1840) - (LEPIDOCHITONIDAE)
- alternata, Euguraleus alternata J.E. Tenison-Woods, 1879 - syn of: Guraleus tasmanicus (J.E. Tenison-Woods, 1876) - (MANGELIIDAE)
- alternata, Tuba alternata (H.C. Lea, 1833 †) - (MATHILDIDAE) (FOSSIL)
- alternata, Mathilda alternata H.C. Lea, 1833 † - syn of: Tuba alternata (H.C. Lea, 1833 †) - (MATHILDIDAE) (FOSSIL)
- alternata, Palaeoscurria alternata Ríha, 1938 † - (METOPTOMATIDAE) (FOSSIL)
- alternata, Typhina alternata Lea, 1833 † - syn of: Laevityphis gracilis (T.A. Conrad, 1833 †) - (MURICIDAE) (FOSSIL)
- alternata, Sphenia alternata D'Orbigny, 1853 - syn of: Cardiomya alternata (A.V.M.D. D'Orbigny, 1853) - (MYIDAE)
- alternata, Partula alternata (W.H. Pease, 1850) - (PARTULIDAE)
- alternata, Siphonaria alternata (T. Say, 1826) - (SIPHONARIIDAE)
- alternata, Sonninia alternata Buckman † - (SONNINIIDAE) (FOSSIL)
- alternata, Eurytellina alternata (T. Say, 1822) - (TELLINIDAE)
- alternata, Euthymella alternata C.F. Laseron, 1958 - (TRIPHORIDAE)
- alternata, Triphora alternata C.B. Adams, 1852 - (TRIPHORIDAE)
- alternata, Triphora alternata W.H. Pease, 1861 - syn of: Triphora bicolor W.H. Pease, 1868 - (TRIPHORIDAE)
- alternata, Thalotia alternata (Tenison Woods, 1877 †) - (TROCHIDAE) (FOSSIL)
- alternata, Turritella alternata T. Say, 1822 - syn of: Bittiolum alternatum (T. Say, 1822) - (TURRITELLIDAE)
- alternata, Lamelliconcha alternata (W.J. Broderip, 1835) - (VENERIDAE)
- alternata chibana, Tellina alternata chibana M. Yokoyama, 1922 † - syn of: Megangulus venulosus (L. von Schrenck, 1861 †) - (TELLINIDAE) (FOSSIL)
- alternata strongylodes, Anguispira alternata strongylodes (L. Pfeiffer, 1854) - (DISCIDAE)
- alternata tayloriana, Tellina alternata tayloriana (G.B. Sowerby, 1867) - syn of: Tellina tayloriana (G.B. Sowerby, 1867) - (TELLINIDAE)
- alternatisculpta, Anatoma alternatisculpta D.L. Geiger & J.H. McLean, 2010 - (ANATOMIDAE)
- alternatoplicatus, Anshunopecten alternatoplicatus F.S. Xu & C.K. Chang, 1980 † - (PECTINIDA (UNASSIGNED)) (FOSSIL)
- alternatum, Brancoceras alternatum J. Kennedy, 2004 † - (BRANCOCERATIDAE) (FOSSIL)
- alternatum, Calliostoma alternatum J.F. Quinn, 1992 - syn of: Calliostoma alternum J.F. Quinn, 1992 - (CALLIOSTOMATIDAE)
- alternatum, Trachycardium alternatum G.B. II Sowerby, 1841 - syn of: Vasticardium angulatum (J.B.P.A. Lamarck, 1819) - (CARDIIDAE)
- alternatum, Bittiolum alternatum (T. Say, 1822) - (CERITHIIDAE)
- alternatum, Cerithium alternatum G.B. II Sowerby, 1855 - syn of: Cerithium zonatum (W. Wood, 1828) - (CERITHIIDAE)
- alternatum, Cerithium alternatum F.W. Hutton, 1873 - syn of: Batillaria australis (J.R.C. Quoy & J.P. Gaimard, 1834) - (CERITHIIDAE)
- alternatum, Diastoma alternatum T. Say, 1822 - syn of: Bittiolum alternatum (T. Say, 1822) - (DIASTOMATIDAE)
- alternatum, Cameroceras alternatum Flower, 1968 † - (ENDOCERATIDAE) (FOSSIL)
- alternatum, Mimimitoceras alternatum W. Korn, 1992 † - syn of: Mimimitoceras alternum W. Korn, 1992 † - (PRIONOCERATIDAE) (FOSSIL)
- alternatus, Ammonites alternatus C.T. Simpson, 1843 † - syn of: Harpoceras serpentinum (von Schlotheim, 1813 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- alternatus, Aviculopecten alternatus R.M. Branson, 1930 † - syn of: Cyrtorostra varicostata R.M. Branson, 1930 † - (AVICULOPECTINIDAE) (FOSSIL)
- alternatus, Rabdotus alternatus (T. Say, 1830) - (BULIMULIDAE)
- alternatus, Lithoconus alternatus J.H.F. Link, 1807 - syn of: Tesselliconus eburneus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- alternatus, Melampus alternatus C.A. Davis, 1904 - syn of: Melampus bidentatus T. Say, 1822 - (ELLOBIIDAE)
- alternatus, Fusinus alternatus G. Buzzurro & P. Russo, 2007 - (FASCIOLARIIDAE)
- alternatus, Fusus alternatus R.A. Philippi, 1847 - syn of: Austrofusus fontainei (A.V.M.D. D'Orbigny, 1841) - (FASCIOLARIIDAE)
- alternatus, Hamites alternatus (Sowerby, 1814 †) - (HAMITIDAE) (FOSSIL)
- alternatus, Antiguraleus alternatus (C.F. Laseron, 1954) - (MANGELIIDAE)
- alternatus, Nostoceras alternatus (M. Tuomey, 1854 †) - (NOSTOCERATIDAE) (FOSSIL)
- alternatus, Liguus fasciatus alternatus C.T. Simpson, 1920 - (ORTHALICIDAE)
- alternatus, Strobeus alternatus Radabaugh, 1942 † - (SOLENISCIDAE) (FOSSIL)
- Alternatus, Genus Alternatus Lyashenko, 1969 (UNICONIDAE) (FOSSIL)
- alternatus albidus, Rabdotus alternatus albidus T.D.A. Cockerell, 1891 - (BULIMULIDAE)
- alternatus hesperius, Bulimulus alternatus hesperius H.A. Pilsbry & J.H. Ferriss, 1924 - syn of: Rabdotus schiedeanus (L. Pfeiffer, 1841) - (BULIMULIDAE)
- alternatus mariae, Rabdotus alternatus mariae J.A. Albers, 1850 - (BULIMULIDAE)
- alternatus nigromontanus, Bulimulus alternatus nigromontanus W.H. Dall, 1897 - syn of: Bulimulus nigromontanus W.H. Dall, 1897 - (BULIMULIDAE)
- alternestriatum, Gorbyoceras alternestriatum (E. Strand, 1934 †) - (PROTEOCERATIDAE) (FOSSIL)
- alternestriatum, Spyroceras alternestriatum E. Strand, 1935 † - (SPYROCERATIDAE) (FOSSIL)
- alternicostata, Patella alternicostata C.L.F. von Sandberger, 1859 † - (PATELLIDAE) (FOSSIL)
- alternidentata, Tellina alternidentata W.J. Broderip & G.B. I Sowerby, 1829 † - syn of: Megangulus luteus (W. Wood, 1828 †) - (TELLINIDAE) (FOSSIL)
- alternilineatus, Delectopecten alternilineatus (Clark, 1918 †) - (PECTINIDAE) (FOSSIL)
- alternistriata, Aphelakardia alternistriata (Herrick, 1888 †) - (CONOCARDIIDAE) (FOSSIL)
- alternodosa, Cymatospira alternodosa (R.P. Whitfield, 1882 †) - (KNIGHTITIDAE) (FOSSIL)
- alternotuberculatum, Protanisoceras alternotuberculatum (Leymerie, 1841 †) - (ANISOCERATIDAE) (FOSSIL)
- alternum, Calliostoma alternum J.F. Quinn, 1992 - (CALLIOSTOMATIDAE)
- alternum, Mimimitoceras alternum W. Korn, 1992 † - (PRIONOCERATIDAE) (FOSSIL)
- alterutra, Helix alterutra T.A. de M. Monterosato, 1892 - syn of: Murella muralis costulata (L. Benoit, 1857) - (HELICIDAE)
- altesinuata, Hormotoma altesinuata E.F.R.K. Koken & J. Perner, 1925 † - (MURCHISONIIDAE) (FOSSIL)
- altevittata, Morania altevittata (Spitz, 1907 †) - (MURCHISONIIDAE) (FOSSIL)
- althea, Cerithiopsis althea W.H. Dall, 1927 - (CERITHIOPSIDAE)
- althoffi, Cleistosphinctes althoffi (Wetzel †) - (PERISPHINCTIDAE) (FOSSIL)
- althorpensis, Oenopota althorpensis W.H. Dall, 1919 - (MANGELIIDAE)
- althorpensis, Margarites althorpensis W.H. Dall, 1919 - (MARGARITIDAE)
- althorpi, Mangelia althorpi W.H. Dall, 1919 - (MANGELIIDAE)
- althothae, Xenodiscus althothae Diener, 1913 † - syn of: Glyptophiceras sinuatum (L. Waagen, 1895 †) - (MEEKOCERATIDAE) (FOSSIL)
- althusii, Natica althusii Klipstein, 1843 † - syn of: Hologyra cassiana (Wissmann, 1841 †) - (NATICIDAE) (FOSSIL)
- altiapica, Opanara altiapica G.A. Solem, 1976 - (ENDODONTIDAE)
- altica, Cylindritopsis altica Wang, 1980 † - (SOLENISCIDAE) (FOSSIL)
- alticallosa, Natica alticallosa W.H. Dall, 1892 † - (NATICIDAE) (FOSSIL)
- alticarinata, Patellilabia alticarinata Wang, 1980 † - (KNIGHTITIDAE) (FOSSIL)
- alticarinata, Worthenia alticarinata Batten, 1989 † - (LOPHOSPIRIDAE) (FOSSIL)
- alticarinatum, Oxytropidoceras alticarinatum Stieler 1920 † - (BRANCOCERATIDAE) (FOSSIL)
- alticarinatum, Amoebites alticarinatum Mesezhnikov & Romm, 1973 † - (CARDIOCERATIDAE) (FOSSIL)
- alticarinatum, Budaiceras alticarinatum A.T. Young, 1979 † - (LYELLICERATIDAE) (FOSSIL)
- alticarinatus, Brodieia alticarinatus Merla 1932 † - (PHYMATOCERATIDAE) (FOSSIL)
- alticincta, Iredalula alticincta (R. Murdoch & H.H. Suter, 1906) - (COLUBRARIIDAE)
- Alticlavatula, syn of: Genus Paradrillia J. Makiyama, 1940 (HORAICLAVIDAE)
- alticola, Pupa alticola E. Ingersoll, 1875 - syn of: Pupilla alticola (E. Ingersoll, 1875) - (ACTEONIDAE)
- alticola, Plekocheilus fulminans alticola F. Haas, 1955 - (AMPHIBULIMIDAE)
- alticola, Gabbia alticola T.N. Annandale, 1918 - (BITHYNIIDAE)
- alticola, Fruticicola scalaris alticola (Y. Tzvetkov, 1941) - (BRADYBAENIDAE)
- alticola, Amphidromus alticola H.C. Fulton, 1896 - (CAMAENIDAE)
- alticola, Oospira alticola E.C. Von Martens, 1892 - (CLAUSILIIDAE)
- alticola, Inchoatia haussknechti alticola (H. Nordsieck, 1974) - (CLAUSILIIDAE)
- alticola, Alinda biplicata alticola (J. Urbanski, 1960) - (CLAUSILIIDAE)
- alticola, Dicharax alticola Páll-Gergely & Hunyadi, 2017 - (CYCLOPHORIDAE)
- alticola, Alycaeus alticola Foon & Liew, 2017 - (CYCLOPHORIDAE)
- alticola, Japonia alticola F.F. Laidlaw, 1937 - syn of: Japonia borneensis (E.A. Smith, 1894) - (CYCLOPHORIDAE)
- alticola, Helix alticola W. Kobelt, 1903 - syn of: Ambigua fuscolabiata gauri (W. Kobelt, 1903) - (HELICIDAE)
- alticola, Xeromunda alticola B. Hausdorf, 1995 - (HYGROMIIDAE)
- alticola, Lymnaea alticola Z.I. Izzatullaev, N.D. Kruglov & Y.I. Starobogatov, 1983 - (LYMNAEIDAE)
- alticola, Fluvinerita alticola H.A. Pilsbry, 1932 - (NERITIDAE)
- alticola, Pallifera costaricensis alticola H.B. Baker, 1930 - (PHILOMYCIDAE)
- alticola, Pupilla alticola (E. Ingersoll, 1875) - (PUPILLIDAE)
- alticola, Sphaerium alticola W. Kobelt, 1913 - (SPHAERIIDAE)
- alticola, Proameria alticola (H.A. Pilsbry, 1903) - (SPIRAXIDAE)
- alticola, Columella columella alticola (E. Ingersoll, 1875) - (VERTIGINIDAE)
- alticonica, Conus alticonica P.M. Pallary, 1904 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- alticonica, Ananias alticonica (Wang, 1980 †) - (GOSSELETINIDAE) (FOSSIL)
- alticonica, Peruvispira alticonica Wang, 1980 † - (GOSSELETINIDAE) (FOSSIL)
- alticonica, Guizhouspira alticonica Wang, 1980 † - syn of: Ananias alticonica (Wang, 1980 †) - (GOSSELETINIDAE) (FOSSIL)
- alticonus, Roemeriella alticonus Cook & al., 2003 † - (PSEUDOPHORIDAE) (FOSSIL)
- alticosta, Fissuridea alticosta (T.A. Conrad, 1834 †) - (FISSURELLIDAE) (FOSSIL)
- alticosta, Hipponix alticosta A.E.M. Cossmann † - (HIPPONICIDAE) (FOSSIL)
- alticosta, Limea alticosta R. Tate, 1886 † - (LIMIDAE) (FOSSIL)
- alticosta, Garantiana alticosta Wetzel, 1911 † - (PARKINSONIIDAE) (FOSSIL)
- alticostata, Claibornicardia alticostata (T.A. Conrad, 1833 †) - (CARDITIDAE) (FOSSIL)
- alticostata, Glyptoactis alticostata (T.A. Conrad, 1833 †) - (CARDITIDAE) (FOSSIL)
- alticostata, Venericardia alticostata T.A. Conrad, 1833 † - syn of: Claibornicardia alticostata (T.A. Conrad, 1833 †) - (CARDITIDAE) (FOSSIL)
- alticostata, Splendrillia alticostata P.J. Fallon, 2016 - (DRILLIIDAE)
- alticostata, Patelloida alticostata (G.F. Angas, 1865) - (LOTTIIDAE)
- alticostata, Patelloida alticostata T. Iredale, 1924 - syn of: Patelloida alticostata (G.F. Angas, 1865) - (LOTTIIDAE)
- alticostata, Pseudorhaphitoma alticostata (G.B. III Sowerby, 1896) - (MANGELIIDAE)
- alticostata, Cellana alticostata G.F. Angas, 1865 - syn of: Patelloida alticostata (G.F. Angas, 1865) - (NACELLIDAE)
- alticostata, Turritella alticostata T.A. Conrad, 1834 † - (TURRITELLIDAE) (FOSSIL)
- alticostata, Livonia alticostata R. Tate, 1889 † - (VOLUTIDAE) (FOSSIL)
- alticostatus, Seymourites alticostatus Imlay, 1953 † - (KOSMOCERATIDAE) (FOSSIL)
- alticostus, Arctocephalites alticostus Imlay, 1962 † - (CADOCERATIDAE) (FOSSIL)
- Altidelos, Genus Altidelos J. Stanisic, 2010 (RHYTIDIDAE)
- altidorsata, Semicorallidomus altidorsata Isberg, 1934 † - (MODIOMORPHIDAE) (FOSSIL)
- altidorsatum, Phragmoceras altidorsatum Foerste, 1929 † - (PHRAGMOCERATIDAE) (FOSSIL)
- altidorsatus, Sanguinolites altidorsatus Easton, 1962 † - (SANGUINOLITIDAE) (FOSSIL)
- altifluminis, Inoceramus altifluminis McLearn, 1943 † - (INOCERAMIDAE) (FOSSIL)
- altiformis, Achatinella mustelina altiformis D.A. Welch, 1938 - (ACHATINELLIDAE)
- altiformis, Ectocentrites altiformis Bonarelli, 1899 † - (LYTOCERATIDAE) (FOSSIL)
- altifrons, Peristernia altifrons R. Tate, 1888 † - (FASCIOLARIIDAE) (FOSSIL)
- altifrons, Eutrephoceras altifrons A.C. Chapman, 1915 † - (NAUTILIDAE) (FOSSIL)
- altijugatus, Modiolus altijugatus J. Marwick, 1931 † - (MYTILIDAE) (FOSSIL)
- altilabra, Mesoginella altilabra (W.L. May, 1911) - (MARGINELLIDAE)
- altile, Buccinanops altile T.A. Conrad, 1832 † - syn of: Bullia altilis (T.A. Conrad, 1832 †) - (NASSARIIDAE) (FOSSIL)
- altilira, Bactrospira altilira (T.A. Conrad, 1857 †) - (TURRITELLIDAE) (FOSSIL)
- altilira chiriquiensis, Bactrospira altilira chiriquiensis (A.A. Olsson, 1922 †) - (TURRITELLIDAE) (FOSSIL)
- altilira costaricensis, Bactrospira altilira costaricensis (A.A. Olsson, 1922 †) - (TURRITELLIDAE) (FOSSIL)
- altilira praecellens, Bactrospira altilira praecellens (H.A. Pilsbry & J. Brown, 1917 †) - (TURRITELLIDAE) (FOSSIL)
- altilira tornata, Bactrospira altilira tornata (R.J.L. Guppy, 1917 †) - (TURRITELLIDAE) (FOSSIL)
- altilirata, Turritella altilirata Grzybowski, 1899 † - (TURRITELLIDAE) (FOSSIL)
- altilis, Ancilla altilis T.A. Conrad, 1832 † - syn of: Bullia altilis (T.A. Conrad, 1832 †) - (ANCILLARIIDAE) (FOSSIL)
- altilis, Ptychosalpinx altilis (T.A. Conrad, 1832 †) - (BUCCINIDAE) (FOSSIL)
- altilis, Ceratites altilis Smith, 1914 † - syn of: Frechites occidentalis (Smith, 1914 †) - (CERATITIDAE) (FOSSIL)
- altilis, Polymesoda altilis A.A. Gould, 1853 - syn of: Polymesoda mexicana (W.J. Broderip & G.B. I Sowerby, 1829) - (CYRENIDAE)
- altilis, Cyrena altilis A.A. Gould, 1853 - syn of: Polymesoda mexicana (W.J. Broderip & G.B. I Sowerby, 1829) - (CYRENIDAE)
- altilis, Emarginula altilis A.A. Gould, 1859 - syn of: Variegemarginula punctata (A. Adams, 1852) - (FISSURELLIDAE)
- altilis, Gillia altilis (I. Lea, 1841) - (LITHOGLYPHIDAE)
- altilis, Bullia altilis (T.A. Conrad, 1832 †) - (NASSARIIDAE) (FOSSIL)
- altilis, Pagodulina pagodula altilis M. Klemm, 1939 - (ORCULIDAE)
- altilis, Orthaulax altilis H.A. Pilsbry, 1922 † - (STROMBIDAE) (FOSSIL)
- altilis, Asklepioceras altilis Tozer, 1994 † - (TRACHYCERATIDAE) (FOSSIL)
- altilis, Hamiota altilis (T.A. Conrad, 1834) - (UNIONIDAE)
- altilobatum, Metacoceras altilobatum Ruzhentsev & Shimanskiy, 1954 † - (TAINOCERATIDAE) (FOSSIL)
- altilunula, Cyclomactra altilunula (J. Marwick, 1927 †) - (MACTRIDAE) (FOSSIL)
- altimasta, Pleuroploca altimasta T. Iredale, 1930 - syn of: Filifusus filamentosus (P.F. Röding, 1798) - (FASCIOLARIIDAE)
- altiminima, Pyrgulina altiminima Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- altimirai, Deroceras altimirai C.O. Van Regteren Altena, 1969 - (AGRIOLIMACIDAE)
- altimirai, Chondrina altimirai E. Gittenberger, 1973 - (CHONDRINIDAE)
- altimirai, Eulima altimirai F. Nordsieck, 1977 - syn of: Melanella polita (C. Linnaeus, 1758) - (EULIMIDAE)
- altimirai, Suboestophora altimirai (A. Ortiz De Zárate, 1962) - (HYGROMIIDAE)
- altimirai, Ceratia altimirai F. Nordsieck, 1982 - (IRAVADIIDAE)
- altimirai, Ortizius altimirai F. Riedel, 1972 - (OXYCHILIDAE)
- altimirai, Oestophora altimirai A. Ortiz De Zárate, 1962 - syn of: Suboestophora altimirai (A. Ortiz De Zárate, 1962) - (TRISSEXODONTIDAE)
- altimirai, Gibbula altimirai F. Nordsieck, 1982 - syn of: Gibbula nivosa A. Adams, 1853 - (TROCHIDAE)
- altina, Odostomia altina W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- altina, Xanthodaphne agonia altina (W.H. Dall, 1908) - (RAPHITOMIDAE)
- altineri, Parainoceramya altineri (L.F. Conti & Monari, 1991 †) - (INOCERAMIDAE) (FOSSIL)
- altinodosa, Parthenina altinodosa Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- altior, Cerastoderma glaucum altior M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1889 - (CARDIIDAE)
- altior, Dentherona altior (T. Iredale, 1941) - (CHAROPIDAE)
- altior, Amphissa columbiana altior W.H. Dall, 1916 - (COLUMBELLIDAE)
- altior, Iphigenia altior (G.B. I Sowerby, 1833) - (DONACIDAE)
- altior, Altrix altior (Meyer & T.H. Aldrich, 1886 †) - (FISSURELLIDAE) (FOSSIL)
- altior, Fissurella altior Meyer & T.H. Aldrich, 1896 † - syn of: Altrix altior (Meyer & T.H. Aldrich, 1886 †) - (FISSURELLIDAE) (FOSSIL)
- altior, Jujubinus altior G.S. Coen, 1937 - syn of: Jujubinus striatus (C. Linnaeus, 1758) - (TROCHIDAE)
- altior, Dosinia altior G.P. Deshayes, 1853 - (VENERIDAE)
- altior, Viviparus altior H.A. Pilsbry, 1892 - (VIVIPARIDAE)
- altiplano, Notonucula altiplano Farjat 2005 † - (NUCULIDA (UNASSIGNED)) (FOSSIL)
- altiplectus, Pecten altiplectus T.A. Conrad, 1857 - syn of: Chlamys hastata (G.B. II Sowerby, 1842) - (PECTINIDAE)
- altiplicatus, Pecten altiplicatus T.A. Conrad, 1857 - syn of: Chlamys hastata (G.B. II Sowerby, 1842) - (PECTINIDAE)
- altirostrata, Allorisma altirostrata F.B. Meek & Hayden, 1858 † - (EDMONDIIDAE) (FOSSIL)
- altirostratus, Exochorhynchus altirostratus (F.B. Meek & Hayden, 1858 †) - (SANGUINOLITIDAE) (FOSSIL)
- altirostris, Corbula altirostris Li, 1930 - syn of: Mulinia pallida (W.J. Broderip & G.B. I Sowerby, 1829) - (CORBULIDAE)
- altirostris, Mulinia altirostris C.C. Li, 1930 - syn of: Mulinia pallida (W.J. Broderip & G.B. I Sowerby, 1829) - (MACTRIDAE)
- altisellatum, Centroceras altisellatum Wedekind, 1908 † - syn of: Torleyoceras altisellatum (Wedekind, 1908 †) - (CENTROCERATIDAE) (FOSSIL)
- altisellatum, Torleyoceras altisellatum (Wedekind, 1908 †) - (CHEILOCERATIDAE) (FOSSIL)
- altisellatum, Cheiloceras altisellatum Wedekind, 1908 † - syn of: Torleyoceras altisellatum (Wedekind, 1908 †) - (CHEILOCERATIDAE) (FOSSIL)
- altisellatum, Imitoceras altisellatum Schindewolf, 1923 † - syn of: Mimimitoceras pompeckji (Schindewolf, 1923 †) - (PRIONOCERATIDAE) (FOSSIL)
- altisiphites, Cenoceras altisiphites Prinz, 1906 † - (CENOCERATIDAE) (FOSSIL)
- Altispecula, Genus Altispecula A. Powell, 1930 (NEWTONIELLIDAE)
- altispira, Neptunea altispira W.M. Gabb, 1869 † - (BUCCINIDAE) (FOSSIL)
- altispira, Oxychona altispira E.C. Von Martens, 1892 - syn of: Dryotrochus altispira (E.C. Von Martens, 1892) - (BULIMULIDAE)
- altispira, Cassis altispira A.G. Beu, 2010 † - (CASSIDAE) (FOSSIL)
- altispira, Zafra altispira L. Bozzetti, 2008 - (COLUMBELLIDAE)
- altispira, Drillia altispira A.V. Sysoev, 1996 - (DRILLIIDAE)
- altispira, Ficus altispira (G.B. Pritchard, 1896 †) - (FICIDAE) (FOSSIL)
- altispira, Helix altispira C.de Paiva, 1867 - syn of: Theba pisana (O.F. Müller, 1774) - (HELICIDAE)
- altispira, Melongena altispira H.A. Pilsbry & E.G. Vanatta, 1934 - syn of: Melongena corona altispira H.A. Pilsbry & E.G. Vanatta, 1934 - (MELONGENIDAE)
- altispira, Melongena corona altispira H.A. Pilsbry & E.G. Vanatta, 1934 - (MELONGENIDAE)
- altispira, Murex altispira W.F. Ponder & E.H. Vokes, 1988 - (MURICIDAE)
- altispira, Stenotrema altispira H.A. Pilsbry, 1894 - (POLYGYRIDAE)
- altispira, Rissopsetia altispira W.F. Ponder, 1974 - (PYRAMIDELLIDAE)
- altispira, Gymnobela altispira A.V. Sysoev & D.L. Ivanov, 1985 - (RAPHITOMIDAE)
- altispira, Euglandina altispira W.K. Weyrauch, 1960 - (SPIRAXIDAE)
- altispira, Gibbula altispira A.E.M. Cossmann & M.A. Peyrot, 1916 † - (TROCHIDAE) (FOSSIL)
- altispira, Turris altispira (W.L. May, 1922 †) - (TURRIDAE) (FOSSIL)
- altispira, Cymbiola magnifica altispira A. Maybloom, 1951 - (VOLUTIDAE)
- altispira, Dryotrochus altispira (E.C. Von Martens, 1892) - (XANTHONYCHIDAE)
- altispiralis, Gyronema altispiralis A.W. Grabau, 1922 † - (LOPHOSPIRIDAE) (FOSSIL)
- altispiralis, Shansiella altispiralis (A.W. Grabau, 1922 †) - (PORTLOCKIELLIDAE) (FOSSIL)
- altispiralis, Liratina altispiralis Yü, 1982 † - (VALVATIDAE) (FOSSIL)
- altispiratum, Pentagoniostoma altispiratum R.M. Branson, 1935 † - (PLANORBIDAE) (FOSSIL)
- altispiratus, Sciteconus altispiratus G.B. II Sowerby, 1873 - syn of: Sciteconus mozambicus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- altispirus, Alycaeus perakensis altispirus O.F. von Möllendorff, 1902 - (CYCLOPHORIDAE)
- altispirus, Pupinidius pupinella altispirus (O.F. von Möllendorff, 1902) - (ENIDAE)
- altissima, Astarte altissima L.R. Cox, 1935 † - (ASTARTIDAE) (FOSSIL)
- altissima, Notoseila altissima (A.N. Golikov & V.V. Gulbin, 1978) - (CERITHIOPSIDAE)
- altissima, Corbicula altissima J.P.J. Ravn, 1922 † - (CYRENIDAE) (FOSSIL)
- altissima, Terraia altissima (Holdhaus, 1918 †) - (MYOPHORICARDIIDAE) (FOSSIL)
- altissima, Tellina altissima E.A. Smith, 1906 - (TELLINIDAE)
- altissimum, Calliscaphites altissimum (M. Collignon, 1950 †) - (LABECERATIDAE) (FOSSIL)
- altissimus, Gyraulus altissimus (F.C. Baker, 1919) - (PLANORBIDAE)
- altisulcatum, Proturritella altisulcatum Hudson, 1905 † - syn of: Proturritella historicum Hudson, 1905 † - (LOPHOSPIRIDAE) (FOSSIL)
- altisuturatum, Vexillum altisuturatum M. Chino & M. Herrmann, 2014 - (COSTELLARIIDAE)
- altitropis, Pharkidonotus altitropis Kulas & Batten, 1997 † - (BELLEROPHONTIDAE) (FOSSIL)
- altitudinaria, Bruggenina altitudinaria (T.E. Crowley & T. Pain, 1961) - (ACHATINIDAE)
- altiumbonata, Casertiana altiumbonata Y.I. Starobogatov & L.L. Budnikova, 1985 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- altius, Hypselostoma annamiticum altius H.A. Pilsbry, 1917 - (HYPSELOSTOMATIDAE)
- altius, Syringoceras altius Mojsisovics, 1902 † - (SYRINGONAUTILIDAE) (FOSSIL)
- altiuscula, Solariella altiuscula R.J.L. Guppy, 1896 † - (SOLARIELLIDAE) (FOSSIL)
- altivaga, Systrophiella altivaga A.J. Crawford, 1939 - (SCOLODONTIDAE)
- altivagus, Anadenus altivagus (W. Theobald, 1862) - (ANADENIDAE)
- altivagus, Cyclophorus altivagus W.H. Benson, 1854 - (CYCLOPHORIDAE)
- altivagus, Akromesodon altivagus (H.A. Pilsbry, 1900) - (POLYGYRIDAE)
- altivapicana, Ampullinopsis altivapicana F.E. Eames, 1952 † - (AMPULLINIDAE) (FOSSIL)
- Altivasum, Subgenus Vasum (Altivasum) C. Hedley, 1914 (TURBINELLIDAE)
- altivolvis, Loxonema altivolvis J.J.F. Whiteaves, 1892 † - syn of: Bensbergia altivolvis (J.J.F. Whiteaves, 1892 †) - (LOXONEMATIDAE) (FOSSIL)
- altivolvis, Bensbergia altivolvis (J.J.F. Whiteaves, 1892 †) - (SOLENISCIDAE) (FOSSIL)
- alto, Scissurella alto D.L. Geiger, 2003 - (SCISSURELLIDAE)
- altocanalis, Ringicula altocanalis R.K. Dell, 1952 † - (RINGICULIDAE) (FOSSIL)
- altocanalis, Coluzea altocanalis R.K. Dell, 1956 - (TURBINELLIDAE)
- altoensis, Scutalus phaeocheilus altoensis A.S.H. Breure & V. Mogollón Avilla, 2010 - (BULIMULIDAE)
- Altomarginula, Subgenus Emarginula (Altomarginula) Haber, 1932 (FISSURELLIDAE) (FOSSIL)
- altonagai, Papilloderma altonagai A. Wiktor, R. Martín & J. Castillejo, 1990 - (PAPILLODERMATIDAE)
- altonensis, Naticopsis altonensis Norwood & Pratten, 1855 † - syn of: Jedria meeki (Knight, 1933 †) - (DELPHINULOPSIDAE) (FOSSIL)
- altonensis, Natica altonensis McChesney, 1865 † - syn of: Jedria ventrica (Norwood & Pratten, 1855 †) - (NATICIDAE) (FOSSIL)
- altonensis, Soleniscus altonensis McChesney, 1865 † - (SOLENISCIDAE) (FOSSIL)
- altoni, Naticopsis altoni E.A.L. Kittl, 1892 † - (DELPHINULOPSIDAE) (FOSSIL)
- altonmoui, Umbilidelos altonmoui J. Stanisic, 2010 - (RHYTIDIDAE)
- altoperuvianus, Neopetraeus altoperuvianus (L.A. Reeve, 1849) - (BULIMULIDAE)
- altoperuvianus gracilior, Neopetraeus altoperuvianus gracilior H.A. Pilsbry, 1898 - (BULIMULIDAE)
- altopontense, Actinoceras altopontense Foerste & Teichert, 1930 † - (ACTINOCERATIDAE) (FOSSIL)
- altoprimus, Corrugopecten altoprimus C.O. Waterhouse, 1982 † - (DELTOPECTINIDAE) (FOSSIL)
- altora, Systrophia altora W.K. Weyrauch, 1967 - (SCOLODONTIDAE)
- altorum, Drymaeus expansus altorum W.K. Weyrauch, 1958 - (BULIMULIDAE)
- altorum, Scutalus revinctus altorum F. Haas, 1951 - (BULIMULIDAE)
- altosongoensis, Gongylostomella strigis altosongoensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- altoumbonatum, Pitar altoumbonatum (T. Nagao, 1928 †) - (VENERIDAE) (FOSSIL)
- Altrix, Genus Altrix K.V.W. Palmer, 1942 (FISSURELLIDAE)
- altsia, Lacunospira altsia Batten, 1958 † - (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- altudense, Gastrioceras altudense Böse, 1919 † - syn of: Altudoceras altudense (Böse, 1919 †) - (GASTRIOCERATIDAE) (FOSSIL)
- altudense, Altudoceras altudense (Böse, 1919 †) - (PARAGASTRIOCERATIDAE) (FOSSIL)
- altudensis, Paraceltites altudensis (Böse, 1919 †) - (PARACELTITIDAE) (FOSSIL)
- altudensis, Paralecanites altudensis Böse, 1919 † - syn of: Paraceltites altudensis (Böse, 1919 †) - (PARACELTITIDAE) (FOSSIL)
- Altudoceras, Genus Altudoceras Ruzhencev , 1940 (PARAGASTRIOCERATIDAE) (FOSSIL)
- altum, Proaustraliceras altum (Glazunova, 1973 †) - (ANCYLOCERATIDAE) (FOSSIL)
- altum, Cardium altum E. Forbes, 1846 - (CARDIIDAE)
- altum, Conocardium altum Keyes, 1888 † - (CONOCARDIIDAE) (FOSSIL)
- altum, Leptopoma altum O.F. von Möllendorff, 1897 - (CYCLOPHORIDAE)
- altum, Eurydesma altum Harrington, 1955 † - (EURYDESMATIDAE) (FOSSIL)
- altum, Bembicium altum (R. Tate, 1894 †) - (LITTORINIDAE) (FOSSIL)
- altum, Exomiloceras altum (J. Von Hauer, 1856 †) - (LYTOCERATIDAE) (FOSSIL)
- altum, Phragmoceras altum Foerste, 1936 † - (PHRAGMOCERATIDAE) (FOSSIL)
- altum, Plicacerithium altum A.V. Guzhov, 2002 † - (PROCERITHIIDAE) (FOSSIL)
- altum, Teinostoma altum H.A. Pilsbry, 1953 - (TORNIDAE)
- altum, Trochonema altum Ulrich & Scofield, 1897 † - (TROCHONEMATIDAE) (FOSSIL)
- altum, Pleurobema altum T.A. Conrad, 1854 - (UNIONIDAE)
- altum, Spirostemma altum (G.B. Sowerby, 1875) - (UROCOPTIDAE)
- altum, Placamen altum (G.B. II Sowerby, 1853) - (VENERIDAE)
- altum, Gafrarium altum W.H. Dall, 1903 † - syn of: Gouldia alta W.H. Dall, 1903 † - (VENERIDAE) (FOSSIL)
- altumincile, Parthenina altumincile Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- altunense, Agathiceras altunense Wang, 1983 † - syn of: Agathiceras mediterraneum Toumanskaya, 1949 † - (AGATHICERATIDAE) (FOSSIL)
- alturensis, Ophileta alturensis Sardeson, 1896 † - (OPHILETIDAE) (FOSSIL)
- altus, Aviculopecten altus White, 1879 † - (AVICULOPECTINIDAE) (FOSSIL)
- altus, Anomalisipho altus (S.V. Wood, 1848) - (BUCCINIDAE)
- altus, Naesiotus altus (W.H. Dall, 1893) - (BULIMULIDAE)
- altus, Cylindrites altus Morris & J. Lycett, 1851 † - syn of: Rugalindrites altus (Morris & J. Lycett 1851 †) - (CEPHALASPIDAE) (FOSSIL)
- altus, Pachydon altus T.A. Conrad, 1871 † - (CORBULIDAE) (FOSSIL)
- altus, Rugalindrites altus (Morris & J. Lycett 1851 †) - (CYLINDROBULLINIDAE) (FOSSIL)
- altus, Colpomphalus altus (A.V.M.D. D'Orbigny, 1853 †) - (DISCOHELICIDAE) (FOSSIL)
- altus, Straparollus altus A.V.M.D. D'Orbigny, 1853 † - syn of: Colpomphalus altus (A.V.M.D. D'Orbigny, 1853 †) - (EUOMPHALIDAE) (FOSSIL)
- altus, Galericulus altus Seeley, 1861 † - (GASTROPODA INCERTAE SEDIS) (FOSSIL)
- altus, Allochiton altus Fucini, 1912 † - (ISCHNOCHITONIDAE) (FOSSIL)
- altus, Valenciennius altus (Gorjanovic-Kramberger, 1901 †) - (LYMNAEIDAE) (FOSSIL)
- altus, Maclurites altus Wilson, 1931 † - (MACLURITIDAE) (FOSSIL)
- altus, Trophon altus S.V. Wood, 1848 - syn of: Anomalisipho altus (S.V. Wood, 1848) - (MURICIDAE)
- altus, Polinices altus R. Arnold, 1903 - syn of: Neverita reclusiana (G.P. Deshayes, 1839) - (NATICIDAE)
- altus, Schizodus altus Newell & Boyd, 1975 † - (SCHIZODIDAE) (FOSSIL)
- altus, Hadroconus altus (R.B. Watson, 1879) - (SEGUENZIIDAE)
- altus, Subolenekites altus (Mojsisovics, 1886 †) - (SIBIRITIDAE) (FOSSIL)
- altus, Trochus altus R.A. Philippi, 1851 - syn of: Tectus conus (J.F. Gmelin, 1791) - (TROCHIDAE)
- altus, Trochus altus G. Perry, 1811 - syn of: Tectus conus (J.F. Gmelin, 1791) - (TROCHIDAE)
- altus, Discostyrites altus (Mojsisovics, 1893 †) - (TROPICELTITIDAE) (FOSSIL)
- altus, Vanikoro altus A.E.M. Cossmann, 1888 † - (VANIKORIDAE) (FOSSIL)
- altus, Viviparus altus M. von Neumayr in Herbich & M. von Neumayr, 1875 † - (VIVIPARIDAE) (FOSSIL)
- altusiformis, Inoceramus altusiformis Walaszczyk, Cobban & Harries, 2001 † - (INOCERAMIDAE) (FOSSIL)
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