- a, Tympanotonos involutus a G.P. Deshayes, 1833 - (POTAMIDIDAE)
- Aa, Subgenus Philonesia (Aa) H.B. Baker, 1940 (EUCONULIDAE)
- Aaadonta, Genus Aaadonta G.A. Solem, 1976 (ENDODONTIDAE)
- aages, Bathymophila aages C. Vilvens, 2009 - (SOLARIELLIDAE)
- Aaleniella, Genus Aaleniella Conti & Fischer, 1981 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- aalensis, Pleydellia aalensis Zieten, 1830 † - (HILDOCERATIDAE) (FOSSIL)
- aalensis, Loligosepia aalensis (Schübler in Zieten, 1832 †) - (LOLIGOSEPIIDAE) (FOSSIL)
- aalensis, Megateuthis aalensis Voltz † - (MEGATEUTHIDIDAE) (FOSSIL)
- aapta, Coluzea aapta M.G. Harasewych, 1986 - (TURBINELLIDAE)
- Aaptochiton, Genus Aaptochiton Hoare & Karasawa, 2008 † (GRYPHOCHITONIDAE) (FOSSIL)
- aardahli, Pyrgulopsis aardahli R. Hershler, 1989 - (HYDROBIIDAE)
- aarica, Paffrathia aarica Heidelberger, 2001 † - (PLATYCERATIDAE) (FOSSIL)
- Aaronia, syn of: Genus Hexaplex G. Perry, 1811 (MURICIDAE)
- aaronsohni, Melanopsis aaronsohni Blanckenhorn in Blanckenhorn & P. Oppenheim, 1927 † - (MELANOPSIDAE) (FOSSIL)
- aartseni, Bornia aartseni S. Gofas, 2012 - (KELLIIDAE)
- aartseni, Odostomia aartseni I. Nofroni, 1988 - (PYRAMIDELLIDAE)
- aartseni, Polemicella aartseni E. Robba, S.I. Di Geronimo & al., 2004 - (PYRAMIDELLIDAE)
- aartseni, Turbonilla aartseni C.F.C. Schander, 1994 - syn of: Turbonilla melvilli (P. Dautzenberg, 1912) - (PYRAMIDELLIDAE)
- aartseni, Crisilla aartseni (A. Verduin, 1984) - (RISSOIDAE)
- aartseni, Alvania aartseni A. Verduin, 1986 - (RISSOIDAE)
- aartseni, Rissoa aartseni A. Verduin, 1985 - (RISSOIDAE)
- aartseni, Setia aartseni A. Verduin, 1984 - syn of: Crisilla aartseni (A. Verduin, 1984) - (RISSOIDAE)
- Aartsenia, Genus Aartsenia A. Warén, 1991 (PYRAMIDELLIDAE)
- abacocubensis, Schwartziella abacocubensis J. Espinosa & J.A. Ortea, 2002 - (ZEBINIDAE)
- abacoellus, Opisthosiphon bahamiense abacoellus P. Bartsch, 1946 - (POMATIIDAE)
- abacoensis, Cerion abacoensis H.A. Pilsbry & E.G. Vanatta, 1895 - (CERIONIDAE)
- abacoensis, Opisthosiphon simpsoni abacoensis P. Bartsch, 1946 - (POMATIIDAE)
- abacoensis, Rissoella abacoensis G.M. Caballer, J.A. Ortea & C. Redfern, 2014 - (RISSOELLIDAE)
- abacoensis, Triphora abacoensis E. Rolán & C. Redfern, 2008 - (TRIPHORIDAE)
- abacoides, Unio abacoides S.S. Haldeman, 1846 - syn of: Dromus dromas (I. Lea, 1834) - (UNIONIDAE)
- abaconis, Tivela abaconis W.H. Dall, 1902 - syn of: Tivela trigonella (J.B.P.A. Lamarck, 1818) - (VENERIDAE)
- abacophora, Strigatella abacophora J.C. Melvill, 1888 - (MITRIDAE)
- abaculus, Abdopus abaculus (M.D. Norman & M.J. Sweeney, 1997) - (OCTOPODIDAE)
- abadi, Xeroleuca abadi J. Ahuir, 2014 - (HYGROMIIDAE)
- abadiensis, Aulacomyella abadiensis S. Freneix & Quesne, 1985 † - (AULACOMYELLIDAE) (FOSSIL)
- abadiensis, Perisphinctes abadiensis Choffat, 1893 † - (PERISPHINCTIDAE) (FOSSIL)
- abaeratum, Almaloceras abaeratum P.A. Zhuravleva, 1974 † - (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- Abakaniella, Genus Abakaniella Betekhtina, 1966 † (PROKOPIEVSKIIDAE) (FOSSIL)
- abakcheutos, Eucithara abakcheutos R.N. Kilburn, 1992 - (MANGELIIDAE)
- abakionigraphis, Smaragdia abakionigraphis J. Drivas & M. Jay, 1989 - syn of: Smaragdia tragena (T. Iredale, 1936) - (NERITIDAE)
- abakumovae, Opisthorchophorus abakumovae S.I. Andreeva & Y.I. Starobogatov, 2001 - (BITHYNIIDAE)
- abaliena, Cribrarula abaliena C. P. Meyer & Lorenz, 2017 - (CYPRAEIDAE)
- abaliena, Cribrarula cribraria abaliena F.Jr. Lorenz, 1989 - (CYPRAEIDAE)
- abancayensis, Bostryx abancayensis H.A. Pilsbry, 1944 - (BULIMULIDAE)
- abancayensis rudistriatus, Bostryx abancayensis rudistriatus F. Haas, 1955 - (BULIMULIDAE)
- abandus, Jujubinus abandus G.D. Chiereghini - syn of: Jujubinus montagui (W. Wood, 1828) - (TROCHIDAE)
- abanteus, Jujubinus abanteus G.D. Nardo, 1847 - syn of: Jujubinus montagui (W. Wood, 1828) - (TROCHIDAE)
- abanti, Strumosa abanti (R.A.M. Brandt, 1961) - (CLAUSILIIDAE)
- abanti alamellata, Strumosa abanti alamellata E. Neubert, 1993 - (CLAUSILIIDAE)
- abanti schnelli, Strumosa abanti schnelli H. Nordsieck, 1984 - (CLAUSILIIDAE)
- abarbarea, Borsonella abarbarea W.H. Dall, 1919 - syn of: Antiplanes abarbarea (W.H. Dall, 1919) - (BORSONIIDAE)
- abarbarea, Antiplanes abarbarea (W.H. Dall, 1919) - (PSEUDOMELATOMIDAE)
- Abarbatia, syn of: Genus Barbatia J.E. Gray, 1847 (ARCIDAE)
- abarquense, Araxoceras abarquense Zakharov & Moussavi Abnavi, 2010 † - (ARAXOCERATIDAE) (FOSSIL)
- abarriana, Xerosecta abarriana P.M. Pallary, 1923 - (HYGROMIIDAE)
- abasolensis, Venericor abasolensis (Camacho & C. Fernández, 1956 †) - (CARDITIDAE) (FOSSIL)
- abavia, Cincinna abavia Huckriede, 1967 † - (VALVATIDAE) (FOSSIL)
- Abavopsis, Genus Abavopsis L. Salvini-Plawén, 1973 (PHILINOGLOSSIDAE)
- abavus, Amastra abavus A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- abax, Pararhytida abax (É. Marie, 1870) - (CHAROPIDAE)
- abax, Rhytida abax É. Marie, 1870 - syn of: Pararhytida abax (É. Marie, 1870) - (RHYTIDIDAE)
- abaxoides, Granallodiscus abaxoides B.A. Marshall & G.M. Barker, 2008 - (CHAROPIDAE)
- Abbadia, syn of: Genus Macroptychia O. Böttger, 1877 (CLAUSILIIDAE)
- abbadiana, Soleilletia abbadiana J.R. Bourguignat, 1885 - (MESODESMATIDAE)
- abbae, Mimospira abbae Peel, 1975 † - (CLISOSPIRIDAE) (FOSSIL)
- abbas, Cerithium abbas W.H. Hudleston, 1889 † - (CERITHIIDAE) (FOSSIL)
- abbas, Cylinder abbas (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- abbas, Ambercyclus ornatus abbas Hudleston † - (EUCYCLIDAE) (FOSSIL)
- abbas, Turritelloidea abbas (Hudleston, 1892 †) - (GORDENELLIDAE) (FOSSIL)
- abbas, Abbasites abbas Buckman † - (HAMMATOCERATIDAE) (FOSSIL)
- abbas, Neritopsis philea abbas Hudleston † - (NERITOPSIDAE) (FOSSIL)
- abbas, Pleurotomaria rotundata abbas Hudleston † - (PLEUROTOMARIIDAE) (FOSSIL)
- abbas grisea, Conus abbas grisea P. Dautzenberg, 1937 - syn of: Cylinder abbas (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- abbasi, Hemiplecta abbasi W.J.M. Maassen, 2009 - (ARIOPHANTIDAE)
- abbasi, Papuina abbasi N.N. Thach, 2016 - (CAMAENIDAE)
- abbasi, Amphidromus abbasi G.L. Chan & S.K. Tan, 2008 - (CAMAENIDAE)
- abbasi, Comarmondia abbasi Thach, 2017 - (CLATHURELLIDAE)
- abbasi, Leptopoma abbasi Thach, 2017 - (CYCLOPHORIDAE)
- abbasi, Oliva tricolor abbasi (N.N. Thach & D.P. Berschauer, 2016) - (OLIVIDAE)
- abbasi, Bellardiella abbasi N.N. Thach, 2017 - (PUPINIDAE)
- abbasi, Tylotoechus abbasi N.N. Thach, 2017 - syn of: Bellardiella abbasi N.N. Thach, 2017 - (PUPINIDAE)
- Abbasites, Genus Abbasites Buckman, 1921 † (HAMMATOCERATIDAE) (FOSSIL)
- Abbasitoides, Subgenus Erycites (Abbasitoides) Gemmellaro, 1886 † (HAMMATOCERATIDAE) (FOSSIL)
- abbasorum, Amphidromus abbasorum Thach, 2017 - (CAMAENIDAE)
- abbassi, Torquesia abbassi Awad & Abed, 1967 † - (TURRITELLIDAE) (FOSSIL)
- abbatis, Mitra abbatis G. Perry, 1811 - syn of: Tiarella stictica (J.H.F. Link, 1807) - (MITRIDAE)
- abbatis, Mitra abbatis L.W. Dillwyn, 1817 - syn of: Nebularia contracta (W.J. Swainson, 1820) - (MITRIDAE)
- abbatis, Turritella abbatis E.A.L. Kittl, 1892 † - (TURRITELLIDAE) (FOSSIL)
- abbessensis, Zonarina abbessensis L. Dolin & P. Lozouet, 2004 † - (CYPRAEIDAE) (FOSSIL)
- abbevillensis, Unio abbevillensis I. Lea, 1857 - (UNIONIDAE)
- abbeyense, Semiannuloceras abbeyense J. Evans, 2005 † - (BALTOCERATIDAE) (FOSSIL)
- abboti, Sassia abboti (Tenison Woods, 1876 †) - (RANELLIDAE) (FOSSIL)
- Abbottella, Genus Abbottella J. Henderson & P. Bartsch, 1920 (POMATIIDAE)
- abbotthuberorum, Amphidromus abbotthuberorum Thach, 2017 - (CAMAENIDAE)
- abbotti, Armina wattla abbotti T.E. Thompson, G. Cattaneo & Y.M. Wong, 1990 - (ARMINIDAE)
- abbotti, Cassis abbotti P. Bouchet, 1988 - (CASSIDAE)
- abbotti, Strophiops abbotti W.J. Clench, 1961 - (CERIONIDAE)
- abbotti, Leptoconus abbotti W.J. Clench, 1942 - syn of: Purpuriconus jucundus (G.B. III Sowerby, 1887) - (CONIDAE)
- abbotti, Plesiocystiscus abbotti (D. De Jong & H.E. Coomans, 1988) - (CYSTISCIDAE)
- abbotti, Opalia abbotti W.J. Clench & H. Turner, 1952 - (EPITONIIDAE)
- abbotti, Polygona abbotti (M.A. Snyder, 2003) - (FASCIOLARIIDAE)
- abbotti, Helicina abbotti E.G. Vanatta, 1920 - (HELICINIDAE)
- abbotti, Mactromeris abbotti Wiedley, 1928 † - (MACTRIDAE) (FOSSIL)
- abbotti, Crenella abbotti C.O. Van Regteren Altena, 1968 - (MYTILIDAE)
- abbotti, Leiosolenus abbotti H.N. Lowe, 1935 - syn of: Leiosolenus spatiosus (P.P. Carpenter, 1857) - (MYTILIDAE)
- abbotti, Lithophaga abbotti H.N. Lowe, 1935 - syn of: Leiosolenus spatiosus (P.P. Carpenter, 1857) - (MYTILIDAE)
- abbotti, Pseudocyphoma abbotti C.N. Cate, 1973 - syn of: Cyphoma intermedium (G.B. I Sowerby, 1828) - (OVULIDAE)
- abbotti, Abbottella abbotti P. Bartsch, 1946 - (POMATIIDAE)
- abbotti, Ividella abbotti (A.A. Olsson & J.T.L. McGinty, 1958) - (PYRAMIDELLIDAE)
- abbotti, Turbonilla abbotti (E. Robba, S.I. Di Geronimo & al., 2004) - (PYRAMIDELLIDAE)
- abbotti, Chemnitzia abbotti E. Robba, S.I. Di Geronimo & al., 2004 - syn of: Turbonilla abbotti (E. Robba, S.I. Di Geronimo & al., 2004) - (PYRAMIDELLIDAE)
- abbotti, Sassia abbotti Woods, 1874 † - (RANELLIDAE) (FOSSIL)
- abbotti, Zebinella abbotti (H.S. Ladd, 1966 †) - (RISSOINIDAE) (FOSSIL)
- abbotti, Dolomena abbotti A.M. Dekkers & V. Liverani, 2011 - (STROMBIDAE)
- abbotti, Viriola abbotti (F. Baker & V.D.P. Spicer, 1935) - (TRIPHORIDAE)
- abbottiana, Blandia abbottiana E. Chitty, 1857 - (HELICINIDAE)
- abbreviata, Tornatellaria abbreviata (C.M.F. Ancey, 1903) - (ACHATINELLIDAE)
- abbreviata, Achatinella abbreviata L.A. Reeve, 1850 - (ACHATINELLIDAE)
- abbreviata, Atropis abbreviata (W.H. Pease, 1865) - (ASSIMINEIDAE)
- abbreviata, Astarte abbreviata G.B. II Sowerby, 1874 - syn of: Astarte montagui (L.W. Dillwyn, 1817) - (ASTARTIDAE)
- abbreviata, Placostylus porphyrostomus abbreviata (J. Gassies, 1871) - (BOTHRIEMBRYONTIDAE)
- abbreviata, Bythinella abbreviata (A. Michaud, 1831) - (BYTHINELLIDAE)
- abbreviata, Pleuromeris abbreviata G.B. Sowerby, 1903 - syn of: Pleuromeris pygmaea (J.T. Kuroda & T. Habe, 1951) - (CARDITIDAE)
- abbreviata, Cassis abbreviata T.A. de M. Monterosato, 1878 - syn of: Semicassis saburon (J.G. Bruguière, 1792) - (CASSIDAE)
- abbreviata, Phalium abbreviata J.B.P.A. Lamarck, 1822 - syn of: Semicassis granulata (I. von Born, 1778) - (CASSIDAE)
- abbreviata, Oospira abbreviata (E.C. Von Martens, 1867) - (CLAUSILIIDAE)
- abbreviata, Potamocorbula abbreviata (H.B. Preston, 1907) - (CORBULIDAE)
- abbreviata, Salaputium abbreviata (R. Tate, 1886 †) - (CRASSATELLIDAE) (FOSSIL)
- abbreviata, Tropidomya abbreviata (E. Forbes, 1843) - (CUSPIDARIIDAE)
- abbreviata, Bistolida abbreviata P. Dautzenberg, 1903 - syn of: Bistolida hirundo neglecta (J.E. Gray in G.B. II Sowerby, 1832) - (CYPRAEIDAE)
- abbreviata, Diplommatina abbreviata P.M. Heude, 1890 - (DIPLOMMATINIDAE)
- abbreviata, Coccoderma abbreviata (A.R.J.B. Bavay & P. Dautzenberg, 1915) - (ENIDAE)
- abbreviata, Cirsotrema abbreviata G.B. II Sowerby, 1874 - syn of: Cirsotrema varicosa (J.B.P.A. Lamarck, 1822) - (EPITONIIDAE)
- abbreviata, Batheulima abbreviata (J.G. Jeffreys, 1884) - (EULIMIDAE)
- abbreviata, Gastrocopta abbreviata V. Sterki, 1909 - (GASTROCOPTIDAE)
- abbreviata, Glossus subtransversa abbreviata F. Sacco, 1900 † - (GLOSSIDAE) (FOSSIL)
- abbreviata, Austroharpa abbreviata (R. Tate, 1889 †) - (HARPIDAE) (FOSSIL)
- abbreviata, Panopea abbreviata A. Valenciennes, 1839 - (HIATELLIDAE)
- abbreviata, Caspia abbreviata Roshka, 1973 † - (HYDROBIIDAE) (FOSSIL)
- abbreviata, Hydrobia abbreviata (J.P.S. Grateloup, 1827 †) - (HYDROBIIDAE) (FOSSIL)
- abbreviata, Leiostyla abbreviata R.T. Lowe, 1852 - (LAURIIDAE)
- abbreviata, Realia abbreviata W.H. Pease, 1865 - syn of: Atropis abbreviata (W.H. Pease, 1865) - (LIAREIDAE)
- abbreviata, Lophospira abbreviata J.W. Hall, 1847 † - syn of: Lophospira perangulata (J.W. Hall, 1847 †) - (LOPHOSPIRIDAE) (FOSSIL)
- abbreviata, Mactra abbreviata J.B.P.A. Lamarck, 1818 - (MACTRIDAE)
- abbreviata, Eucithara abbreviata (A. Garrett, 1873) - (MANGELIIDAE)
- abbreviata, Volvarina abbreviata (C.B. Adams, 1850) - (MARGINELLIDAE)
- abbreviata, Marginella abbreviata C.B. Adams, 1850 - syn of: Volvarina abbreviata (C.B. Adams, 1850) - (MARGINELLIDAE)
- abbreviata, Volvarina abbreviata C.B. Adams, 1850 - syn of: Volvarina abbreviata (C.B. Adams, 1850) - (MARGINELLIDAE)
- abbreviata, Melanopsis abbreviata Š. Brusina, 1874 † - (MELANOPSIDAE) (FOSSIL)
- abbreviata, Pyrula abbreviata J.B.P.A. Lamarck, 1816 - syn of: Coralliophila erosa (P.F. Röding, 1798) - (MELONGENIDAE)
- abbreviata, Mitra abbreviata G.B. II Sowerby, 1874 - syn of: Vexillum oleaceum (L.A. Reeve, 1844) - (MITRIDAE)
- abbreviata, Coralliophila abbreviata L.C. Kiener, 1836 - syn of: Coralliophila galea (L.W. Dillwyn, 1823) - (MURICIDAE)
- abbreviata, Coralliophila abbreviata J.B.P.A. Lamarck, 1816 - syn of: Coralliophila erosa (P.F. Röding, 1798) - (MURICIDAE)
- abbreviata, Demoulia abbreviata (J.F. Gmelin, 1791) - (NASSARIIDAE)
- abbreviata, Samoana abbreviata (A. Mousson, 1869) - (PARTULIDAE)
- abbreviata, Pholadomya abbreviata Hupe, 1854 † - syn of: Pholadomya fidicula Sowerby, 1826 † - (PHOLADOMYIDAE) (FOSSIL)
- abbreviata, Planaxis abbreviata W.H. Pease, 1865 - syn of: Supplanaxis niger (J.R.C. Quoy & J.P. Gaimard, 1833) - (PLANAXIDAE)
- abbreviata, Eoptychia abbreviata (de Koninck, 1881 †) - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- abbreviata, Pyrgulina abbreviata T.A. de M. Monterosato, 1884 - syn of: Turbonilla amoena (T.A. de M. Monterosato, 1878) - (PYRAMIDELLIDAE)
- abbreviata, Sassia abbreviata (T.A. Conrad, 1848 †) - (RANELLIDAE) (FOSSIL)
- abbreviata, Buccinaria abbreviata (M.M. Schepman, 1913) - (RAPHITOMIDAE)
- abbreviata, Cryptodaphne abbreviata M.M. Schepman, 1913 - syn of: Buccinaria abbreviata (M.M. Schepman, 1913) - (RAPHITOMIDAE)
- abbreviata, Pleurotomella abbreviata M.M. Schepman, 1913 - syn of: Buccinaria abbreviata (M.M. Schepman, 1913) - (RAPHITOMIDAE)
- abbreviata, Ringicula abbreviata G. Nevill, 1875 - (RINGICULIDAE)
- abbreviata, Rissoa abbreviata A.A. Baudon, 1853 † - (RISSOIDAE) (FOSSIL)
- abbreviata, Solemya abbreviata Frech, 1904 † - (SOLEMYIDAE) (FOSSIL)
- abbreviata, Singleya mazatlanica abbreviata (E.C. Von Martens, 1891) - (SPIRAXIDAE)
- abbreviata, Succinea abbreviata P.M.A. Morelet, 1845 - syn of: Succinella oblonga (J.P.R. Draparnaud, 1801) - (SUCCINEIDAE)
- abbreviata, Melania abbreviata Terquem, 1855 † - (THIARIDAE) (FOSSIL)
- abbreviata, Melania abbreviata Klipstein, 1843 † - syn of: Prostylifer paludinaris (Münster, 1841 †) - (THIARIDAE) (FOSSIL)
- abbreviata, Lophiotoma abbreviata (L.A. Reeve, 1843) - (TURRIDAE)
- abbreviata, Cycladicama abbreviata (A.A. Gould, 1861) - (UNGULINIDAE)
- abbreviata, Lithodomina abbreviata L. Waagen, 1881 † - (UNIONIDAE) (FOSSIL)
- abbreviata, Cylindrella abbreviata G.P. Deshayes, 1851 - syn of: Urocoptis brevis (L. Pfeiffer, 1841) - (UROCOPTIDAE)
- abbreviata, Cincinna sorensis abbreviata W.A. Lindholm, 1909 - (VALVATIDAE)
- abbreviata, Yoldia abbreviata G.B. II Sowerby, 1871 - syn of: Yoldia eightsii (J.C. Jay, 1839) - (YOLDIIDAE)
- abbreviata bacca, Achatinella abbreviata bacca L.A. Reeve, 1850 - (ACHATINELLIDAE)
- abbreviata cossmanni, Melanopsis abbreviata cossmanni P.M. Pallary, 1916 † - (MELANOPSIDAE) (FOSSIL)
- abbreviata glabra, Melanopsis abbreviata glabra Š. Brusina, 1874 † - (MELANOPSIDAE) (FOSSIL)
- abbreviata hawaiiensis, Tornatellaria abbreviata hawaiiensis H.A. Pilsbry & C.M. Cooke, 1916 - (ACHATINELLIDAE)
- abbreviata lifuensis, Lophiotoma abbreviata lifuensis (G.B. III Sowerby, 1907) - (TURRIDAE)
- abbreviata major, Rissoa abbreviata major A.A. Baudon, 1853 † - (RISSOIDAE) (FOSSIL)
- abbreviata meritriciformis, Mactra abbreviata meritriciformis L.A. Reeve, 1854 - (MACTRIDAE)
- abbreviata nodosula, Melanopsis abbreviata nodosula W.A. Wenz, 1928 † - (MELANOPSIDAE) (FOSSIL)
- abbreviata obesa, Mactra abbreviata obesa L.A. Reeve, 1854 - (MACTRIDAE)
- abbreviata ustulata, Lophiotoma abbreviata ustulata (L.A. Reeve, 1846) - (TURRIDAE)
- abbreviatum, Buccinum abbreviatum É. Lamy, 1913 - syn of: Buccinum polare J.E. Gray, 1839 - (BUCCINIDAE)
- abbreviatum, Buccinum abbreviatum J.F. Gmelin, 1791 - syn of: Demoulia abbreviata (J.F. Gmelin, 1791) - (BUCCINIDAE)
- abbreviatum, Cerithium abbreviatum J. Leckenby, 1859 † - (CERITHIIDAE) (FOSSIL)
- abbreviatum, Cerithium abbreviatum J.W. Brazier, 1877 - syn of: Ataxocerithium brazieri A.E.M. Cossmann, 1906 - (CERITHIIDAE)
- abbreviatum, Loxonema abbreviatum de Koninck, 1881 † - syn of: Eoptychia abbreviata (de Koninck, 1881 †) - (LOXONEMATIDAE) (FOSSIL)
- abbreviatum, Prunum abbreviatum C.B. Adams, 1850 - syn of: Volvarina abbreviata (C.B. Adams, 1850) - (MARGINELLIDAE)
- abbreviatum, Ataxocerithium abbreviatum J.W. Brazier, 1877 - syn of: Ataxocerithium brazieri A.E.M. Cossmann, 1906 - (NEWTONIELLIDAE)
- abbreviatum, Pachtoceras abbreviatum (Gurich, 1901 †) - (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- abbreviatum, Monoplex abbreviatum L.M.D. Bellardi, 1873 - syn of: Monoplex parthenopeus (C.U.A. von Salis-Marschlins, 1793) - (RANELLIDAE)
- abbreviatus, Buliminopsis abbreviatus A.R.J.B. Bavay & P. Dautzenberg, 1915 - syn of: Coccoderma abbreviata (A.R.J.B. Bavay & P. Dautzenberg, 1915) - (BRADYBAENIDAE)
- abbreviatus, Bulimus abbreviatus J. Gassies, 1871 - (BULIMULIDAE)
- abbreviatus, Plicolumna abbreviatus (J.G. Cooper, 1892) - (BULIMULIDAE)
- abbreviatus, Joculator abbreviatus (K.H.J. Thiele, 1930) - (CERITHIOPSIDAE)
- abbreviatus, Miliariconus abbreviatus (L.A. Reeve, 1843) - (CONIDAE)
- abbreviatus, Donax abbreviatus J.B.P.A. Lamarck, 1818 - (DONACIDAE)
- abbreviatus, Scalenostoma abbreviatus O.A.L. Mörch, 1875 - syn of: Scalenostoma subulatum (W.J. Broderip, 1832) - (EULIMIDAE)
- abbreviatus, Latirus abbreviatus (J.B.P.A. Lamarck, 1803 †) - (FASCIOLARIIDAE) (FOSSIL)
- abbreviatus, Lepidopleurus abbreviatus W.H. Dall, 1908 - syn of: Leptochiton alveolus (S.L. Lovén, 1846) - (LEPTOCHITONIDAE)
- abbreviatus, Antiguraleus abbreviatus Powell, 1944 † - (MANGELIIDAE) (FOSSIL)
- abbreviatus, Megalobulimus abbreviatus J.C. Bequaert - (MEGALOBULIMIDAE)
- abbreviatus, Mytilus abbreviatus J.B.P.A. Lamarck, 1819 - syn of: Mytilus edulis C. Linnaeus, 1758 - (MYTILIDAE)
- abbreviatus, Azorinus abbreviatus (A.A. Gould, 1861) - (SOLECURTIDAE)
- abbreviatus, Solecurtus abbreviatus A.A. Gould, 1861 - syn of: Azorinus abbreviatus (A.A. Gould, 1861) - (SOLECURTIDAE)
- abbreviatus, Solen abbreviatus R.A. Philippi, 1843 - syn of: Solen marginatus R. Pulteney, 1799 - (SOLENIDAE)
- abbreviatus, Strophocheilus granulosus abbreviatus J.C. Bequaert, 1948 - (STROPHOCHEILIDAE)
- abbreviatus, Lamellaxis mexicanus abbreviatus (E.C. Von Martens, 1898) - (SUBULINIDAE)
- abbreviatus, Cyrtospira abbreviatus (J.W. Hall, 1852 †) - (SUBULITIDAE) (FOSSIL)
- abbreviatus, Turbo abbreviatus Klipstein, 1843 † - (TURBINIDAE) (FOSSIL)
- abbreviatus, Unio abbreviatus C.A. Westerlund, 1897 - syn of: Nodularia douglasiae (J.E. Gray in E. Griffith & E. Pidgeon, 1834) - (UNIONIDAE)
- abbreviatus, Microceramus abbreviatus (L. Pfeiffer) - (UROCOPTIDAE)
- abbreviatus, Pitar abbreviatus C.F.F. von Krauss, 1848 - syn of: Pitar hebraeus (J.B.P.A. Lamarck, 1818) - (VENERIDAE)
- abbreviatus, Phyllocaulis abbreviatus H.R. Simroth, 1914 - syn of: Phyllocaulis tuberculosus (E.C. Von Martens, 1868) - (VERONICELLIDAE)
- abchasica, Belgrandiella abchasica Y.I. Starobogatov, 1962 - (HYDROBIIDAE)
- abchasica, Caucasigena abchasica W.A. Lindholm, 1927 - (HYGROMIIDAE)
- abchasica, Tinnyea abchasica (Seninski, 1905 †) - (PACHYCHILIDAE) (FOSSIL)
- abchasica, Vitrea abchasica O. von Retowski, 1914 - syn of: Vitrea contracta (C.A. Westerlund, 1871) - (PRISTILOMATIDAE)
- abchasicaformis, Viviparus abchasicaformis Datsenko in Gozhik & Datsenko, 2007 † - (VIVIPARIDAE) (FOSSIL)
- abchasicus, Viviparus abchasicus Taboyakova, 1964 † - (VIVIPARIDAE) (FOSSIL)
- abchasicus moquicus, Viviparus abchasicus moquicus Taboyakova, 1964 † - (VIVIPARIDAE) (FOSSIL)
- abchasiensis, Macroscaphites abchasiensis Kakabadze, 2004 † - (MACROSCAPHITIDAE) (FOSSIL)
- Abchasohela, Subgenus Circassina (Abchasohela) V. Hüdec & G.I. Lezhawa, 1971 (HYGROMIIDAE)
- abcisum, Cryptaulax abcisum Terquem & L.É.S. Piette, 1868 † - (CRYPTAULACIDAE) (FOSSIL)
- abdera, Clavus abdera W.H. Dall, 1919 - syn of: Crassispira abdera (W.H. Dall, 1919) - (DRILLIIDAE)
- abdera, Elaeocyma abdera W.H. Dall, 1919 - syn of: Crassispira abdera (W.H. Dall, 1919) - (DRILLIIDAE)
- abdera, Crassispira abdera (W.H. Dall, 1919) - (PSEUDOMELATOMIDAE)
- abdera, Dallspira abdera W.H. Dall, 1919 - syn of: Crassispira abdera (W.H. Dall, 1919) - (PSEUDOMELATOMIDAE)
- abdere, Tambja abdere M. Farmer, 1978 - (POLYCERIDAE)
- abdere fusca, Tambja abdere fusca M. Farmer, 1978 - (POLYCERIDAE)
- Abderospira, Genus Abderospira Dall, 1896 † (CYLICHNIDAE) (FOSSIL)
- Abderospira, syn of: Genus Roxania W.E. Leach in J.E. Gray, 1847 (SCAPHANDRIDAE)
- abdieli, Volvarina abdieli J. Espinosa, J.A. Ortea & Y.L. Diez, 2015 - (MARGINELLIDAE)
- abdii, Vaceuchelus abdii G.T. Poppe, S.P. Tagaro & H. Dekker, 2006 - (CHILODONTIDAE)
- abdiplex, Semeloidea abdiplex (J. Marwick, 1931 †) - (LASAEIDAE) (FOSSIL)
- abdita, Acar abdita P.G. Oliver & H.C.G. Chesney, 1994 - (ARCIDAE)
- abdita, Vestia turgida abdita (M. von Kimakowicz, 1883) - (CLAUSILIIDAE)
- abdita, Splendrillia abdita P.J. Fallon, 2016 - (DRILLIIDAE)
- abdita, Oocerina abdita (Barrande, 1877 †) - (ONCOCERATIDAE) (FOSSIL)
- abdita, Eulimella abdita A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- abdita, Cyclas abdita S.S. Haldeman, 1841 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- abdita, Subulina abdita F. Poey, 1857 - syn of: Lamellaxis striosus (C.B. Adams, 1849) - (SUBULINIDAE)
- abdita, Terebra abdita G.P. Deshayes, 1859 - syn of: Duplicaria bernardii (G.P. Deshayes, 1857) - (TEREBRIDAE)
- abdita, Callocoptis abdita (R. Arango, 1880) - (UROCOPTIDAE)
- abdita, Valvata abdita Š. Brusina, 1902 † - (VALVATIDAE) (FOSSIL)
- abditinoda, Ehlersina abditinoda E.G. Linsley, 1968 † - (GOSSELETINIDAE) (FOSSIL)
- abditum, Cerithium abditum R.S. Houbrick, 1992 - (CERITHIIDAE)
- abditum, Tibichoanoceras abditum (I. Balashov & Kiselev, 1968 †) - (ORTHOCERATIDAE) (FOSSIL)
- abditum, Teinostoma abditum E. Rolán, F. Rubio & P. Ryall, 2000 - (TORNIDAE)
- abditum huachucanum, Pisidium abditum huachucanum H.A. Pilsbry & J.H. Ferriss, 1906 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- abditum lacteum, Pisidium abditum lacteum V. Sterki, 1916 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- abditus, Pyrgodomus microdinus abditus H.B. Baker, 1928 - (HELICINIDAE)
- abditus, Sibyllonautilus abditus E.S. Sobolev, 1998 † - (TAINOCERATIDAE) (FOSSIL)
- abdoi, Ancillus abdoi Awad & Abed, 1967 † - (ANCILLARIIDAE) (FOSSIL)
- abdominalis, Trigonodus abdominalis Jelen, 1989 † - (PACHYCARDIIDAE) (FOSSIL)
- abdominiformis, Ovactaeonina abdominiformis Schröder, 1995 † - (ACTEONINIDAE) (FOSSIL)
- Abdopus, Genus Abdopus M.D. Norman & J. Finn, 2001 (OCTOPODIDAE)
- abdoui, Dicharax abdoui Páll-Gergely, 2017 - (CYCLOPHORIDAE)
- abducta, Sigatica abducta (G.P. Deshayes, 1864 †) - (NATICIDAE) (FOSSIL)
- abducta, Orthalicus abducta (R.J. Shuttleworth, 1856) - (ORTHALICIDAE)
- abducta, Venus abducta A. Römer, 1858 - syn of: Circe scripta (C. Linnaeus, 1758) - (VENERIDAE)
- abebaia, Monacha abebaia J.R. Bourguignat - syn of: Eutheba cantiana (G. Montagu, 1803) - (HYGROMIIDAE)
- abedi, Digitolabrum abedi Abbass, 1967 † - (APORRHAIDAE) (FOSSIL)
- abei, Hemiphaedusa abei J.T. Kuroda, 1980 - (CLAUSILIIDAE)
- abei, Alycaeus abei J.T. Kuroda, 1951 - (CYCLOPHORIDAE)
- abei, Diplommatina tosanella abei J.T. Kuroda, 1980 - (DIPLOMMATINIDAE)
- abei, Flabellina abei (K. Baba, 1987) - (FLABELLINIDAE)
- abei, Elysia abei K. Baba, 1955 - (PLAKOBRANCHIDAE)
- abei, Polycera abei (K. Baba, 1960) - (POLYCERIDAE)
- abei, Trabecula abei (S. Nomura, 1938) - (PYRAMIDELLIDAE)
- abeillei, Philonesia abeillei (C.M.F. Ancey, 1889) - (EUCONULIDAE)
- abelai, Clathropsis abelai A. Cecalupo & I. Perugia, 2014 - (CERITHIOPSIDAE)
- abelai, Thala abelai G. Rosenberg & R. Salisbury, 2014 - (COSTELLARIIDAE)
- abeli, Neritilia abeli Espinosa, Ortea & Diez-García, 2017 - (NERITILIIDAE)
- abeli, Pachyclymenia abeli Schindewolf, 1937 † - (PACHYCLYMENIIDAE) (FOSSIL)
- abelii, Pongo abelii R.P. Lesson, 1827 - (Hominidae)
- abendanoni, Eccyliopterus abendanoni (Frech, 1911 †) - (LESUEURILLIDAE) (FOSSIL)
- abendanoni, Ecculiomphalus abendanoni Frech, 1911 † - syn of: Eccyliopterus abendanoni (Frech, 1911 †) - (OPHILETIDAE) (FOSSIL)
- abendanoni, Tylomelania abendanoni (J.H. Kruimel, 1913) - (PACHYCHILIDAE)
- abendanoni, Melania abendanoni J.H. Kruimel, 1913 - syn of: Tylomelania abendanoni (J.H. Kruimel, 1913) - (THIARIDAE)
- abercrombiei, Raeta abercrombiei J.C. Melvill, 1893 - syn of: Raeta pellicula (L.A. Reeve, 1854) - (MACTRIDAE)
- abercrombiei, Turbonilla abercrombiei J.C. Melvill, 1896 - (PYRAMIDELLIDAE)
- abercrombiensis, Austropyrgus abercrombiensis A. Clark, W.B. Miller & W.F. Ponder, 2003 - (HYDROBIIDAE)
- aberdarensis, Chlamydarion aberdarensis G.A. de Mol, 1970 - (UROCYCLIDAE)
- Aberdaria, syn of: Genus Gulella L. Pfeiffer, 1856 (STREPTAXIDAE)
- aberlei, Zuluiceras aberlei Redtenbacher, 1873 † - (COLLIGNONICERATIDAE) (FOSSIL)
- abernethyi, Semicassis abernethyi R.K. Dell, 1956 - syn of: Semicassis pyrum (J.B.P.A. Lamarck, 1822) - (CASSIDAE)
- abernethyi, Antiguraleus abernethyi R.K. Dell, 1956 - (MANGELIIDAE)
- aberrans, Lotzeites aberrans (Kossmat, 1895 †) - (ACANTHOCERATIDAE) (FOSSIL)
- aberrans, Craspedochiton aberrans (N.H. Odhner, 1919) - (ACANTHOCHITONIDAE)
- aberrans, Achatina aberrans L. Pfeiffer, 1846 - syn of: Sigmataxis laeviusculus (C.B. Adams, 1845) - (ACHATINIDAE)
- aberrans, Baidiostraca aberrans H. Guo, 1988 † - (BAIDIOSTRACIDAE) (FOSSIL)
- aberrans, Pomahakia aberrans Finlay, 1927 † - (BUCCINIDAE) (FOSSIL)
- aberrans, Calyptraea aberrans C.B. Adams, 1852 - syn of: Anomia peruviana A.V.M.D. D'Orbigny, 1846 - (CALYPTRAEIDAE)
- aberrans, Metaphaedusa pseudobensoni aberrans H. Nordsieck, 2003 - (CLAUSILIIDAE)
- aberrans, Parapenascoceras aberrans (Miller & Unklesbay, 1942 †) - (DOMATOCERATIDAE) (FOSSIL)
- aberrans, Drillia aberrans A. von Koenen † - (DRILLIIDAE) (FOSSIL)
- aberrans, Pyramidelloides aberrans C.B. Adams, 1850 - syn of: Stosicia aberrans (C.B. Adams, 1850) - (EULIMIDAE)
- aberrans, Gadila aberrans (J.J.F. Whiteaves, 1887) - (GADILIDAE)
- aberrans, Helicarion aberrans T. Iredale, 1944 - (HELICARIONIDAE)
- aberrans, Cleogastroplites aberrans Jeletzky, 1980 † - (HOPLITIDAE) (FOSSIL)
- aberrans, Turricaspia aberrans (N.I. Andrusov, 1890 †) - (HYDROBIIDAE) (FOSSIL)
- aberrans, Helicella aberrans (A. Mousson, 1863) - (HYGROMIIDAE)
- aberrans, Littoraria aberrans (R.A. Philippi, 1846) - (LITTORINIDAE)
- aberrans, Ruedemannia aberrans (J. Perner, 1903 †) - (LOPHOSPIRIDAE) (FOSSIL)
- aberrans, Loripes aberrans (P. Dautzenberg, 1910) - (LUCINIDAE)
- aberrans, Lymnaea aberrans (C.A. Westerlund, 1897) - (LYMNAEIDAE)
- aberrans, Trophonopsis aberrans (R. Houart, 1991) - (MURICIDAE)
- aberrans, Coralliophila aberrans (C.B. Adams, 1850) - (MURICIDAE)
- aberrans, Trophon aberrans R. Houart, 1991 - syn of: Trophonopsis aberrans (R. Houart, 1991) - (MURICIDAE)
- aberrans, Onchidium aberrans C.G. Semper, 1885 - (ONCHIDIIDAE)
- aberrans, Annularisca aberrans C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- aberrans, Pernericirrus aberrans (E.F.R.K. Koken, 1889 †) - (PORCELLIIDAE) (FOSSIL)
- aberrans, Proptychites aberrans (L. Waagen, 1895 †) - (PROPTYCHITIDAE) (FOSSIL)
- aberrans, Pseudaspidites aberrans Chao, 1959 † - syn of: Pseudaspidites muthianus (Krafft & Diener, 1909 †) - (PROPTYCHITIDAE) (FOSSIL)
- aberrans, Sangzhites aberrans J.K. Zhao & Zheng, 1977 † - (PSEUDOHALORITIDAE) (FOSSIL)
- aberrans, Pulsellum aberrans J.J.F. Whiteaves, 1887 - syn of: Gadila aberrans (J.J.F. Whiteaves, 1887) - (PULSELLIDAE)
- aberrans, Rissoa aberrans C.B. Adams, 1850 - syn of: Stosicia aberrans (C.B. Adams, 1850) - (RISSOIDAE)
- aberrans, Sphenodiscus aberrans Böse, 1928 † - (SPHENODISCIDAE) (FOSSIL)
- aberrans, Spiraxis aberrans C.B. Adams, 1850 - syn of: Sigmataxis laeviusculus (C.B. Adams, 1845) - (SPIRAXIDAE)
- aberrans, Metacoceras aberrans Miller & Unklesbay, 1942 † - syn of: Parapenascoceras aberrans (Miller & Unklesbay, 1942 †) - (TAINOCERATIDAE) (FOSSIL)
- aberrans, Unio aberrans I. Lea, 1863 - syn of: Unio abbevillensis I. Lea, 1857 - (UNIONIDAE)
- aberrans, Aphanotylus aberrans Bukowski, 1895 † - (VALVATIDAE) (FOSSIL)
- aberrans, Microconchus aberrans Hohenstein, 1913 † - (VIRIATELLIDAE) (FOSSIL)
- aberrans, Stosicia aberrans (C.B. Adams, 1850) - (ZEBINIDAE)
- aberrans kundukensis, Turricaspia aberrans kundukensis (Roshka, 1973 †) - (HYDROBIIDAE) (FOSSIL)
- aberrans unicolor, Spiraxis aberrans unicolor C.B. Adams, 1851 - syn of: Sigmataxis laeviusculus (C.B. Adams, 1845) - (SPIRAXIDAE)
- aberrata, Ledella aberrata J.A. Allen & A. Sanders, 1996 - (NUCULANIDAE)
- aberrata, Perrottetia aberrata (L.F.A. Souleyet, 1852) - (STREPTAXIDAE)
- aberrata, Nototrigonia aberrata Skwarko, 1963 † - (TRIGONIIDAE) (FOSSIL)
- aberratus, Obtusoconus aberratus Esakova & H. Zhegallo, 1996 † - syn of: Obtusoconus honorabilis (Z.X. Qian & al., 1979 †) - (HELCIONELLIDAE) (FOSSIL)
- aberti, Cyprogenia aberti (T.A. Conrad, 1850) - (UNIONIDAE)
- abeshinaiensis, Homalopoma abeshinaiensis A. Kaim, B.W. Jenkins & Hikida, 2009 † - (COLLONIIDAE) (FOSSIL)
- abesinaiensis, Cyclocardia abesinaiensis Y. Otuka, 1940 † - (CARDITIDAE) (FOSSIL)
- Abeskunus, Subgenus Pseudamnicola (Abeskunus) C.M. Kolesnikov, 1976 (HYDROBIIDAE)
- abessensis, Alocospira abessensis P. Lozouet, 1992 † - (ANCILLARIIDAE) (FOSSIL)
- abessensis, Plaziatia abessensis L. Dolin & P. Lozouet 2004 † - (CYPRAEIDAE) (FOSSIL)
- abessensis, Ponderia abessensis P. Lozouet, 1998 - (MURICIDAE)
- abessinicum, Deroceras abessinicum (H.R. Simroth, 1904) - (AGRIOLIMACIDAE)
- abeuensis, Mujanaia abeuensis G. Delvene, M. Munt & al., 2016 † - (UNIONIDAE) (FOSSIL)
- abichi, Cicatrites abichi (Anthula, 1900 †) - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- abichi, Paradacna abichi Hornes † - (CARDIIDAE) (FOSSIL)
- abichi, Abichites abichi Shevyrev, 1965 † - (DZHULFITIDAE) (FOSSIL)
- abichi, Hyattoceras abichi C. Gemmellaro, 1887 † - (HYATTOCERATIDAE) (FOSSIL)
- abichi, Pyrgula abichi B.M. Logvinenko & Y.I. Starobogatov, 1968 - (HYDROBIIDAE)
- abichi, Tamaragonia abichi (Anthula, 1899 †) - (IOTRIGONIIDAE) (FOSSIL)
- abichi, Alexandronautilus abichi (N.D. Kruglov, 1928 †) - (LIROCERATIDAE) (FOSSIL)
- abichi, Lytoceras abichi Anthula, 1900 † - syn of: Cicatrites abichi (Anthula, 1900 †) - (LYTOCERATIDAE) (FOSSIL)
- abichi, Melanopsis abichi Calvert & M. von Neumayr, 1880 † - (MELANOPSIDAE) (FOSSIL)
- abichi, Partschiceras abichi (Uhlig †) - (PHYLLOCERATIDAE) (FOSSIL)
- abichi, Hippochrenes abichi Alekseev, 1963 † - (ROSTELLARIIDAE) (FOSSIL)
- abichi, Viriatella abichi Dorodnova, 1993 † - (VIRIATELLIDAE) (FOSSIL)
- Abichia, syn of: Genus Hyattoceras Gemmellaro , 1887 † (HYATTOCERATIDAE) (FOSSIL)
- abichianum, Gastrioceras abichianum Moeller, 1879 † - syn of: Pseudogastrioceras abichianum (H.P.C. Møller, 1879 †) - (GASTRIOCERATIDAE) (FOSSIL)
- abichianum, Pseudogastrioceras abichianum (H.P.C. Møller, 1879 †) - (PARAGASTRIOCERATIDAE) (FOSSIL)
- abichii, Pseudocrioceras abichii (Batsevich, 1873 †) - (ANCYLOCERATIDAE) (FOSSIL)
- abichii, Scaphites abichii Batsevich, 1873 † - syn of: Pseudocrioceras abichii (Batsevich, 1873 †) - (SCAPHITIDAE) (FOSSIL)
- abichii africanum, Pseudocrioceras abichii africanum (Kilian, 1902 †) - (ANCYLOCERATIDAE) (FOSSIL)
- Abichites, Genus Abichites Shevyrev , 1965 † (DZHULFITIDAE) (FOSSIL)
- Abida, Genus Abida W.E. Leach in W.H. Turton, 1831 (CHONDRINIDAE)
- abida, Melanella abida W.H. Dall, 1927 - (EULIMIDAE)
- abidjanense, Chaetoderma abidjanense A.H. Scheltema, 1976 - (CHAETODERMATIDAE)
- abiehanum, Heteroceras abiehanum A.V.M.D. D'Orbigny, 1851 † - syn of: Kutatissites abiehanus (A.V.M.D. D'Orbigny, 1851 †) - (HETEROCERATIDAE) (FOSSIL)
- abiehanus, Kutatissites abiehanus (A.V.M.D. D'Orbigny, 1851 †) - (ANCYLOCERATIDAE) (FOSSIL)
- Abiella, Genus Abiella Khalfin, 1950 † (PROKOPIEVSKIIDAE) (FOSSIL)
- abies, Ponderia abies R. Houart, 1986 - (MURICIDAE)
- abiesiana, Diplommatina abiesiana Budha & Naggs, 2017 - (DIPLOMMATINIDAE)
- abietina, Clausilia abietina D. Dupuy, 1850 - syn of: Clausilia bidentata abietina (D. Dupuy, 1850) - (CLAUSILIIDAE)
- abietina, Clausilia bidentata abietina (D. Dupuy, 1850) - (CLAUSILIIDAE)
- abietina, Clausilia rugosa abietina D. Dupuy, 1850 - (CLAUSILIIDAE)
- abietinus, Gonyodiscus abietinus J.R. Bourguignat, 1864 - syn of: Gonyodiscus rotundatus (O.F. Müller, 1774) - (DISCIDAE)
- abietis, Argopecten abietis H.K. Jordan & L.G. Hertlein, 1926 - (PECTINIDAE)
- abietum, Radiodiscus abietum H.B. Baker, 1930 - (HELICODISCIDAE)
- abildgaardi, Colga abildgaardi A. Pruvot-Fol, 1954 - syn of: Colga pacifica (L.S.R. Bergh, 1894) - (POLYCERIDAE)
- abildgaardiana, Gastrana abildgaardiana (L. Spengler, 1798) - (TELLINIDAE)
- Abinaria, syn of: Genus Albinaria W. von Vest, 1867 (CLAUSILIIDAE)
- Abisa, syn of: Genus Vulsella P.F. Röding, 1798 (PTERIIDAE)
- abjecta, Cerithiopsis abjecta H.B. Preston, 1905 - (CERITHIOPSIDAE)
- abjecta, Echinolittorina abjecta A. Adams, 1852 - syn of: Echinolittorina atrata (A. Adams, 1852) - (LITTORINIDAE)
- abjecta, Dicathais abjecta (R. Tate, 1888 †) - (MURICIDAE) (FOSSIL)
- abjecta, Semilaoma abjecta T. Iredale, 1944 - (PUNCTIDAE)
- abjecta, Sayella abjecta (C. Hedley, 1909) - (PYRAMIDELLIDAE)
- abjecta, Setia abjecta (R.B. Watson, 1873) - (RISSOIDAE)
- abjectus, Helix abjectus R.T. Lowe, 1851 - syn of: Caseolus abjectus (R.T. Lowe, 1851) - (HELICIDAE)
- abjectus, Caseolus abjectus (R.T. Lowe, 1851) - (HYGROMIIDAE)
- abjectus, Fossarus abjectus (C.B. Adams, 1852) - (PLANAXIDAE)
- abjectus candisatus, Caseolus abjectus candisatus (L. Pfeiffer, 1846) - (HYGROMIIDAE)
- abjectus nesiotes, Helix abjectus nesiotes T.V. Wollaston, 1878 - syn of: Caseolus abjectus nesiotes (T.V. Wollaston, 1878) - (HELICIDAE)
- abjectus nesiotes, Caseolus abjectus nesiotes (T.V. Wollaston, 1878) - (HYGROMIIDAE)
- abjunctus, Pyrgiscus abjunctus C.R. Laws, 1937 † - (PYRAMIDELLIDAE) (FOSSIL)
- ableptis, Naticopsis ableptis Batten, 1974 † - (DELPHINULOPSIDAE) (FOSSIL)
- abletti, Austenia abletti Thach, 2017 - (ARIOPHANTIDAE)
- abletti, Rhiostoma abletti Thach, 2016 - (CYCLOPHORIDAE)
- ablita, Gibberula ablita (C.F. Laseron, 1957) - (CYSTISCIDAE)
- abludens, Trochulus striolatus abludens (É.A.A. Locard, 1888) - (HYGROMIIDAE)
- abnatum, Chondropoma abnatum (J. Gundlach in L. Pfeiffer, 1858) - (POMATIIDAE)
- abnobae, Bythiospeum abnobae (D. Geyer, 1905) - (HYDROBIIDAE)
- abnorma, Marginodostomia abnorma (S. Nomura, 1937) - (PYRAMIDELLIDAE)
- abnormale, Caecum abnormale P.P. Carpenter, 1857 - (CAECIDAE)
- abnormale, Ataxocerithium abnormale (G.B. III Sowerby, 1903) - (NEWTONIELLIDAE)
- abnormalis, Pododesmus abnormalis J.E. Gray, 1850 - syn of: Pododesmus rudis (W.J. Broderip, 1834) - (ANOMIIDAE)
- abnormalis, Pettersia abnormalis (Olsson 1944) † - (GLYCYMERIDIDAE) (FOSSIL)
- abnormalis, Proptychites abnormalis Chao, 1959 † - syn of: Pseudaspidites muthianus (Krafft & Diener, 1909 †) - (PROPTYCHITIDAE) (FOSSIL)
- abnormalis, Bizarrus abnormalis (B. Wade, 1926 †) - (PUGNELLIDAE) (FOSSIL)
- abnormalis, Stosicia abnormalis G. Nevill, 1875 - syn of: Stosicia abnormis (G. Nevill & H. Nevill, 1875) - (ZEBINIDAE)
- abnorme, Protocycloceras abnorme Ulrich & al., 1944 † - (PROTOCYCLOCERATIDAE) (FOSSIL)
- abnorme, Teinostoma abnorme E.A. Smith, 1890 - (TORNIDAE)
- abnormis, Cancellaria abnormis J.E. Gray, 1847 - (CANCELLARIIDAE)
- abnormis, Loxotaphrus abnormis (J.F. Bayan, 1870 †) - (CANCELLARIIDAE) (FOSSIL)
- abnormis, Admete abnormis F.W. Harmer, 1918 - syn of: Admete viridula (O. Fabricius, 1780) - (CANCELLARIIDAE)
- abnormis, Cardita abnormis É.A.A. Locard, 1889 † - (CARDITIDAE) (FOSSIL)
- abnormis, Morio abnormis J.F. Bayan, 1870 † - syn of: Loxotaphrus abnormis (J.F. Bayan, 1870 †) - (CASSIDAE) (FOSSIL)
- abnormis, Ectenolites abnormis B.Z. Li, 1984 † - (ELLESMEROCERATIDAE) (FOSSIL)
- abnormis, Latirus abnormis Sowerby, 1894 - (FASCIOLARIIDAE)
- abnormis, Fusus abnormis E.A. Smith, 1878 - syn of: Coralliophila abnormis (E.A. Smith, 1878) - (FASCIOLARIIDAE)
- abnormis, Emarginula abnormis Stoppani, 1858 † - (FISSURELLIDAE) (FOSSIL)
- abnormis, Scutus abnormis G. Nevill & H. Nevill, 1874 - syn of: Pholas orientalis J.F. Gmelin, 1791 - (FISSURELLIDAE)
- abnormis, Helix abnormis L. Pfeiffer, 1855 - syn of: Pleurodonte lucerna (O.F. Müller, 1774) - (HELICIDAE)
- abnormis, Lophospira abnormis Ulrich & Scofield, 1897 † - (LOPHOSPIRIDAE) (FOSSIL)
- abnormis, Antiguraleus abnormis (F.W. Hutton, 1885 †) - (MANGELIIDAE) (FOSSIL)
- abnormis, Coralliophila abnormis (E.A. Smith, 1878) - (MURICIDAE)
- abnormis, Nassa abnormis G.S. Coen, 1914 - syn of: Nassarius nitidus (J.G. Jeffreys, 1867) - (NASSARIIDAE)
- abnormis, Theodoxus abnormis (B.W. Jenkins, 1864 †) - (NERITIDAE) (FOSSIL)
- abnormis, Comitas abnormis L. C. King, 1933 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- abnormis, Rissoina abnormis G. Nevill & H. Nevill, 1875 - syn of: Stosicia abnormis (G. Nevill & H. Nevill, 1875) - (RISSOINIDAE)
- abnormis, Solemya abnormis Howse, 1848 † - syn of: Janeia biarmica (de Verneuil, 1845 †) - (SOLEMYIDAE) (FOSSIL)
- abnormis, Sonninia abnormis Buckman † - (SONNINIIDAE) (FOSSIL)
- abnormis, Unio abnormis P.W. Parmalee & A. Bogan, 1998 - syn of: Epioblasma torulosa (C.S. Rafinesque, 1820) - (UNIONIDAE)
- abnormis, Steatocoptis abnormis (J. Gundlach in H.A. Pilsbry, 1903) - (UROCOPTIDAE)
- abnormis, Stosicia abnormis (G. Nevill & H. Nevill, 1875) - (ZEBINIDAE)
- abnormis cretensis, Theodoxus abnormis cretensis Willmann, 1980 † - (NERITIDAE) (FOSSIL)
- abolescens, Plocezyga abolescens Knight, 1930 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- aboreensis, Marshallopsis aboreensis Cecalupo & Perugia, 2017 - (CERITHIOPSIDAE)
- aborensis, Montiphaedusa annandalei aborensis (H.H. Godwin-Austen, 1918) - (CLAUSILIIDAE)
- aborensis, Endothyrella aborensis (G.P.L.K. Gude, 1915) - (PLECTOPYLIDAE)
- aborensis, Raphaulus aborensis H.H. Godwin-Austen, 1917 - (PUPINIDAE)
- aboriginalis, Acroteuthis aboriginalis F.M. Anderson, 1938 † - (PASSALOTEUTHIDIDAE) (FOSSIL)
- aboriginea, Diminovula aboriginea (C.N. Cate, 1973) - (OVULIDAE)
- aborlanensis, Amphidromus quadrasi aborlanensis P. Bartsch, 1946 - (CAMAENIDAE)
- abortiva, Acroptychia metableta abortiva E. Fischer-Piette & A.M. Testud, 1973 - (MEGALOMASTOMIDAE)
- abortivum, Actinoceras abortivum Flower, 1957 † - (ACTINOCERATIDAE) (FOSSIL)
- abortivum, Pisidium abortivum V. Sterki, 1916 - syn of: Pisidium conventus S. Clessin, 1877 - (SPHAERIIDAE)
- abortivum exiguum, Pisidium abortivum exiguum V. Sterki, 1916 - syn of: Pisidium conventus S. Clessin, 1877 - (SPHAERIIDAE)
- aboula, Corbicula aboula P.M. Pallary, 1909 - syn of: Corbicula fluminalis (O.F. Müller, 1774) - (CYRENIDAE)
- aboussalamae, Paragattendorfia aboussalamae Bockwinkel & Ebbighausen, 2006 † - (PRIONOCERATIDAE) (FOSSIL)
- aboventrosa, Mangelia multilineolata aboventrosa F. Nordsieck, 1977 - (MANGELIIDAE)
- abowsheri, Cancelloplatyceras abowsheri Cook & al., 2003 † - (PLATYCERATIDAE) (FOSSIL)
- Abra, Genus Abra J.B.P.A. Lamarck, 1818 (SEMELIDAE)
- Abrachlamys, Genus Abrachlamys Beu & Darragh, 2001 † (PECTINIDAE) (FOSSIL)
- abradeta, Opacuincola abradeta M. Haase, 2008 - (TATEIDAE)
- abraea, Helix abraea J.F. Mabille, 1867 - syn of: Murella muralis (O.F. Müller, 1774) - (HELICIDAE)
- abraensis, Microceramus abraensis C. de la Torre & P. Bartsch, 2008 - (UROCOPTIDAE)
- abraensis, Callocoptis abraensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- abraensis, Tomelasmus irroratus abraensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- abrahamiana, Melanopsis mesopotamica abrahamiana P.M. Pallary, 1939 - (MELANOPSIDAE)
- Abralia, Genus Abralia J.E. Gray, 1849 (ENOPLOTEUTHIDAE)
- Abraliopsis, Genus Abraliopsis L.M.A.O.E. Joubin, 1896 (ENOPLOTEUTHIDAE)
- abramovi, Neoglyphioceras abramovi A.M. Popov, 1964 † - (GONIATITIDAE) (FOSSIL)
- abramovi, Gissaromya abramovi Repin, 2008 † - (PACHYDOMIDAE) (FOSSIL)
- abramowi, Gigantomilax abramowi H.R. Simroth, 1910 - syn of: Turcomilax nanus H.R. Simroth, 1901 - (LIMACIDAE)
- Abranchaea, Genus Abranchaea S. Zhang, 1964 (PNEUMODERMATIDAE)
- Abranda, Subgenus Tellina (Abranda) T. Iredale, 1924 (TELLINIDAE)
- abrantesianus, Unio abrantesianus É.A.A. Locard, 1899 - (UNIONIDAE)
- abrardi, Pyrgiscus abrardi (E. Fischer-Piette & M. Nicklés, 1946) - (PYRAMIDELLIDAE)
- abrardi, Turbonilla abrardi E. Fischer-Piette & M. Nicklés, 1946 - syn of: Pyrgiscus abrardi (E. Fischer-Piette & M. Nicklés, 1946) - (PYRAMIDELLIDAE)
- abrardi, Ailinzebina abrardi (H.S. Ladd, 1966) - (RISSOINIDAE)
- abrardi, Rissoina abrardi H.S. Ladd, 1966 - syn of: Ailinzebina abrardi (H.S. Ladd, 1966) - (RISSOINIDAE)
- abrejosensis, Oceanida abrejosensis (P. Bartsch, 1917) - (EULIMIDAE)
- abrekensis, Dicellonema abrekensis A. Kaim, 2009 † - (BELLEROPHONTIDAE) (FOSSIL)
- abrekensis, Ussuriflemingites abrekensis Y. Shigeta & Zakharov, 2009 † - (FLEMINGITIDAE) (FOSSIL)
- abrekensis, Xiaohenautilus abrekensis Y. Shigeta & Zakharov, 2009 † - (GRYPOCERATIDAE) (FOSSIL)
- abrekensis, Radioprionites abrekensis Y. Shigeta & Zakharov, 2009 † - (PRIONITIDAE) (FOSSIL)
- Abrekites, Genus Abrekites Shigeta & Zakharov, 2009 † (MEEKOCERATIDAE) (FOSSIL)
- Abrekopsis, Genus Abrekopsis Kaim , 2009 † (NATICOPSIDAE) (FOSSIL)
- abreojensis, Cerithiopsis abreojensis P. Bartsch, 1911 - (CERITHIOPSIDAE)
- abreojensis, Turbonilla abreojensis W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- abreojosensis, Cerithiopsis abreojosensis P. Bartsch, 1911 - syn of: Cerithiopsis abreojensis P. Bartsch, 1911 - (CERITHIOPSIDAE)
- abreojosensis, Melanella abreojosensis P. Bartsch, 1917 - (EULIMIDAE)
- Abretiella, syn of: Genus Perirhoe W.H. Dall, 1908 (TEREBRIDAE)
- abreui, Sulawesidrobia abreui S. Zielske, M. Glaubrecht & M. Haase, 2011 - (HYDROBIIDAE)
- abreui, Liostomia abreui A. Peñas, E. Rolán & F. Swinnen, 2015 - (PYRAMIDELLIDAE)
- abreui, Turbonilla abreui A. Peñas & E. Rolán, 2000 - (PYRAMIDELLIDAE)
- abreviata, Volvarina abreviata S.A.A. Petit De La Saussaye, 1851 - syn of: Volvarina abbreviata (C.B. Adams, 1850) - (MARGINELLIDAE)
- abreviatum, Caecum abreviatum L. de Folin, 1870 - (CAECIDAE)
- Abrina, syn of: Genus Abra J.B.P.A. Lamarck, 1818 (SEMELIDAE)
- abrodiaetus, Gibbula abrodiaetus G.D. Nardo, 1847 - syn of: Gibbula adriatica (R.A. Philippi, 1844) - (TROCHIDAE)
- abrolena, Otala abrolena (J.R. Bourguignat, 1864) - (HELICIDAE)
- abrolena, Archelix abrolena J.R. Bourguignat, 1864 - syn of: Otala abrolena (J.R. Bourguignat, 1864) - (HELICIDAE)
- abrolhense, Acrosterigma abrolhense E. Vidal, 1999 - syn of: Acrosterigma cygnorum (G.P. Deshayes, 1855) - (CARDIIDAE)
- abrolhensis, Cribrarula exmouthensis abrolhensis F.Jr. Lorenz, 2002 - (CYPRAEIDAE)
- abrolhosense, Stephopoma abrolhosense R. Bieler, 1997 - (VERMETIDAE)
- abrolhosensis, Poremskiconus abrolhosensis (E.J. Petuch, 1987) - (CONIDAE)
- abrolhosensis, Lottia abrolhosensis (E.J. Petuch, 1979) - (LOTTIIDAE)
- abromia, Helix abromia J.F. Mabille, 1867 - syn of: Murella muralis (O.F. Müller, 1774) - (HELICIDAE)
- abronensis, Chondrothyrella assimilis abronensis C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- abronia, Cratena abronia F.M. MacFarland, 1966 - syn of: Cuthona abronia (F.M. MacFarland, 1966) - (FACELINIDAE)
- abronia, Cuthona abronia (F.M. MacFarland, 1966) - (FIONIDAE)
- abropenus, Lataxiena abropenus R. Houart, 1999 - syn of: Lataxiena habropenos R. Houart, 1995 - (MURICIDAE)
- abrotona, Euthria abrotona K. Fraussen & E. Rolán, 2003 - (BUCCINIDAE)
- abrupta, Anchura abrupta T.A. Conrad, 1860 † - (APORRHAIDAE) (FOSSIL)
- abrupta, Arca abrupta E. Forbes, 1846 - (ARCIDAE)
- abrupta, Borsonella abrupta J.H. McLean & L.H. Poorman, 1971 - (BORSONIIDAE)
- abrupta, Agathylla abrupta (H.C. Küster, 1845) - (CLAUSILIIDAE)
- abrupta, Chattina abrupta (G.B. III Sowerby, 1904) - (CRASSATELLIDAE)
- abrupta, Rhinoclama abrupta (J.A. Allen & R.E. Morgan, 1981) - (CUSPIDARIIDAE)
- abrupta, Austroneaera abrupta J.A. Allen & R.E. Morgan, 1981 - syn of: Rhinoclama abrupta (J.A. Allen & R.E. Morgan, 1981) - (CUSPIDARIIDAE)
- abrupta, Vanuxemia abrupta Ulrich, 1894 † - (CYRTODONTIDAE) (FOSSIL)
- abrupta, Paraliospira abrupta (Ulrich & Scofield, 1897 †) - (EOTOMARIIDAE) (FOSSIL)
- abrupta, Curveulima abrupta C.F. Laseron, 1955 - (EULIMIDAE)
- abrupta, Leptostega abrupta (Shaler & Foerste, 1888 †) - (HELCIONELLIDAE) (FOSSIL)
- abrupta, Lophonema abrupta (Billings, 1859 †) - (HELICOTOMIDAE) (FOSSIL)
- abrupta, Panopea abrupta (T.A. Conrad, 1849) - (HIATELLIDAE)
- abrupta, Saxicava abrupta T.A. Conrad, 1855 - syn of: Petricola carditoides (T.A. Conrad, 1837) - (HIATELLIDAE)
- abrupta, Barrandeicardia abrupta (Barrande, 1881 †) - (HIPPOCARDIIDAE) (FOSSIL)
- abrupta, Hippocardia abrupta Barrande, 1881 † - syn of: Barrandeicardia abrupta (Barrande, 1881 †) - (HIPPOCARDIIDAE) (FOSSIL)
- abrupta, Malletia abrupta (T.A. Conrad, 1848 †) - (MALLETIIDAE) (FOSSIL)
- abrupta, Margaritaria abrupta (T.A. Conrad, 1832 †) - (MARGARITARIIDAE) (FOSSIL)
- abrupta, Hemithecella abrupta Stinchcomb & Darrough, 1995 † - (MATTHEVIIDAE) (FOSSIL)
- abrupta, Mya abrupta T.A. Conrad, 1849 - syn of: Panopea abrupta (T.A. Conrad, 1849) - (MYIDAE)
- abrupta, Polidevcia abrupta (J.B.M. Dana, 1847 †) - (NUCULANIDAE) (FOSSIL)
- abrupta, Nuculana abrupta J.B.M. Dana, 1847 † - syn of: Polidevcia abrupta (J.B.M. Dana, 1847 †) - (NUCULANIDAE) (FOSSIL)
- abrupta, Nucula abrupta J.B.M. Dana, 1847 † - syn of: Polidevcia abrupta (J.B.M. Dana, 1847 †) - (NUCULIDAE) (FOSSIL)
- abrupta, Nucula abrupta T.A. Conrad, 1848 † - syn of: Malletia abrupta (T.A. Conrad, 1848 †) - (NUCULIDAE) (FOSSIL)
- abrupta, Abruptolopha abrupta (d'Orbigny 1842) † - (OSTREIDAE) (FOSSIL)
- abrupta, Clastoteuthis abrupta H.G. Lang, 1928 † - (PASSALOTEUTHIDIDAE) (FOSSIL)
- abrupta, Pholadomya abrupta T.A. Conrad, 1832 † - syn of: Margaritaria abrupta (T.A. Conrad, 1832 †) - (PHOLADOMYIDAE) (FOSSIL)
- abrupta, Praenucula abrupta Kríž & Steinová, 2009 † - (PRAENUCULIDAE) (FOSSIL)
- abrupta, Psammobia abrupta G.P. Deshayes, 1855 - syn of: Gari pulcherrima (G.P. Deshayes, 1855) - (PSAMMOBIIDAE)
- abrupta, Turbonilla abrupta K.J. Bush, 1899 - (PYRAMIDELLIDAE)
- abrupta, Alvania abrupta (R.K. Dell, 1956) - (RISSOIDAE)
- abrupta, Schizopea abrupta Ulrich & al., 1931 † - (SINUOPEIDAE) (FOSSIL)
- abrupta, Melania abrupta I. Lea, 1845 - (THIARIDAE)
- abrupta, Triphora abrupta (W.H. Dall, 1881) - (TRIPHORIDAE)
- abrupta, Metaxia abrupta R.B. Watson, 1880 - syn of: Metaxia metaxa (S. Delle Chiaje, 1828) - (TRIPHORIDAE)
- abrupta, Turritella abrupta E.M. Spieker, 1922 † - (TURRITELLIDAE) (FOSSIL)
- abrupta, Lampsilis abrupta T. Say, 1831 - (UNIONIDAE)
- abruptoinflata, Gadila abruptoinflata (M. Boissevain, 1906) - (GADILIDAE)
- Abruptolopha, Genus Abruptolopha Vialov, 1936 † (OSTREIDAE) (FOSSIL)
- abruptum, Cerithiopsis abruptum R.B. Watson, 1880 - (CERITHIOPSIDAE)
- abruptum, Conocardium abruptum Barrande, 1881 † - syn of: Hindsiclava henekeni (Sowerby, 1850 †) - (CONOCARDIIDAE) (FOSSIL)
- abruptum, Onychochilus abruptum Foerste, 1893 † - (ONYCHOCHILIDAE) (FOSSIL)
- abruptum, Trochonema abruptum Billings, 1859 † - syn of: Lophonema abrupta (Billings, 1859 †) - (TROCHONEMATIDAE) (FOSSIL)
- abruptum, Kheraiceras abruptum Imlay 1953 † - (TULITIDAE) (FOSSIL)
- abruptus, Drymaeus abruptus H. Rolle, 1905 - (BULIMULIDAE)
- abruptus, Conus abruptus P. Marshall, 1918 † - (CONIDAE) (FOSSIL)
- abruptus, Seymourites abruptus McLearn, 1929 † - (KOSMOCERATIDAE) (FOSSIL)
- abruptus, Benthoctopus abruptus (M. Sasaki, 1920) - (OCTOPODIDAE)
- abruptus, Schizodus abruptus Girty, 1915 † - syn of: Schizodus depressus A.H. Worthen, 1884 † - (SCHIZODIDAE) (FOSSIL)
- abruptus, Iniskinites abruptus (Imlay, 1953 †) - (SPHAEROCERATIDAE) (FOSSIL)
- Abrytasites, syn of: Genus Abrytusites Nikolov & Brekoviski, 1969 † (DESMOCERATIDAE) (FOSSIL)
- Abrytusites, Genus Abrytusites Nikolov & Brekoviski, 1969 † (DESMOCERATIDAE) (FOSSIL)
- absalaoi, Aegires absalaoi F.J. García, J.S. Troncoso & M. Domínguez, 2002 - (AEGIRIDAE)
- abscabra, Epifungium abscabra E. Gittenberger, 2005 - syn of: Epifungium adscabra E. Gittenberger & A. Gittenberger, 2005 - (EPITONIIDAE)
- abscedens, Formosana abscedens Hunyadi & Szekeres, 2016 - (CLAUSILIIDAE)
- Abscindostoma, syn of: Genus Eatoniella W.H. Dall, 1876 (EATONIELLIDAE)
- abscisa, Divarilima abscisa (K.H. Barnard, 1964) - (LIMIDAE)
- abscissa, Lyonsiella abscissa J.P.L. Pelseneer, 1911 - (LYONSIELLIDAE)
- abscissum, Conocardium abscissum E.M. Fletcher, 1943 † - syn of: Hippocardia monroica Sherzer & A.W. Grabau, 1910 † - (CONOCARDIIDAE) (FOSSIL)
- abscissum, Hippocardia abscissum E.M. Fletcher, 1943 † - syn of: Hippocardia mundula (E.M. Fletcher, 1943 †) - (HIPPOCARDIIDAE) (FOSSIL)
- abscissus, Drymaeus abscissus L. Pfeiffer, 1855 - (BULIMULIDAE)
- abscisus, Tropicolpus abscisus (H.H. Suter, 1971 †) - (TURRITELLIDAE) (FOSSIL)
- abscondita, Ampullina abscondita (G.P. Deshayes, 1864 †) - (AMPULLINIDAE) (FOSSIL)
- abscondita, Tomura abscondita E. Rolán & F. Rubio, 1999 - (CORNIROSTRIDAE)
- abscondita, Fenimorea abscondita P.J. Fallon, 2016 - (DRILLIIDAE)
- abscondita, Modiolus abscondita A. Aradas, 1847 - syn of: Lioberus agglutinans (F.J. Cantraine, 1835) - (MYTILIDAE)
- abscondita, Amygdalum abscondita A. Aradas, 1847 - syn of: Lioberus agglutinans (F.J. Cantraine, 1835) - (MYTILIDAE)
- abscondita, Talochlamys abscondita (P. Fischer in É.A.A. Locard, 1898) - (PECTINIDAE)
- absconditus, Nassarius absconditus C. Gili, 2015 - (NASSARIIDAE)
- abseida, Turbonilla abseida W.H. Dall & P. Bartsch, 1906 - (PYRAMIDELLIDAE)
- absida, Mellopegma absida Li & Ding, 1996 † - syn of: Stenotheca drepanoida He & al., 1984 † - (STENOTHECIDAE) (FOSSIL)
- absidata, Candidula absidata É.A.A. Locard, 1899 - syn of: Candidula belemensis (G. Servain, 1880) - (HYGROMIIDAE)
- absidata, Paramoria absidata (B.C. Cotton, 1949 †) - (VOLUTIDAE) (FOSSIL)
- Absidaticonus, Genus Absidaticonus He & Yang, 1982 † (HELCIONELLIDAE) (FOSSIL)
- absidatus, Allodiscus absidatus B.A. Marshall & G.M. Barker, 2008 - (CHAROPIDAE)
- absoloni, Iglica absoloni (A.J. Wagner, 1914) - (HYDROBIIDAE)
- absoloni, Oxychilus absoloni (A.J. Wagner, 1914) - (OXYCHILIDAE)
- absoloni, Hyalinia absoloni A.J. Wagner, 1914 - syn of: Oxychilus absoloni (A.J. Wagner, 1914) - (ZONITIDAE)
- absoluta, Maitaia absoluta Astafieva, 1989 † - (ATOMODESMATIDAE) (FOSSIL)
- absoluta, Stylonema absoluta (G.A. Goldfuss, 1844 †) - (LOXONEMATIDAE) (FOSSIL)
- absolutiformis, Belemnites absolutiformis Sinzow, 1877 † - syn of: Aulacoteuthis absolutiformis (Sinzow, 1877 †) - (BELEMNITELLIDAE) (FOSSIL)
- absolutiformis, Aulacoteuthis absolutiformis (Sinzow, 1877 †) - (BELEMNITIDA (UNASSIGNED)) (FOSSIL)
- absona, Beddomeia acheronensis absona W.F. Ponder & K.B. Clark, 1993 - (HYDROBIIDAE)
- absona, Favartia absona (G.J. De Cristofori & G. Jan, 1832 †) - (MURICIDAE) (FOSSIL)
- absonun, Tenuicerithium absonun R.C. Hoerle, 1972 † - (CERITHIIDAE) (FOSSIL)
- absscissa, Stereomactra absscissa (Gabb 1869) † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- abstans, Pleuroxia abstans T. Iredale, 1939 - (CAMAENIDAE)
- abstersa, Alvania abstersa J. van der Linden & J.J. Van Aartsen, 1994 - (RISSOIDAE)
- abstrusa, Paryphantopsis abstrusa J. Slapcinsky, 2005 - (CHAROPIDAE)
- abstrusa, Oospira abstrusa (M. Szekeres, 1970) - (CLAUSILIIDAE)
- abstrusa, Puposyrnola abstrusa A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- absumptus, Latipes absumptus (G. Colosi, 1921) - (VERONICELLIDAE)
- absyrtidum, Melanopsis absyrtidum Stache, 1871 † - (MELANOPSIDAE) (FOSSIL)
- absyrtus, Argonauta absyrtus Martill & G.M. Barker, 2006 † - (ARGONAUTIDAE) (FOSSIL)
- abtiana, Tudora abtiana (L. Pfeiffer, 1862) - (POMATIIDAE)
- abubekri, Nicomedites abubekri F. Toula, 1896 † - syn of: Nicomedites osmani F. Toula, 1896 † - (BEYRICHITIDAE) (FOSSIL)
- abuhabili, Melanoides abuhabili Alhejoj & K. Bandel, 2013 † - (THIARIDAE) (FOSSIL)
- abukumaense, Tainoceras abukumaense I. Hayasaka, 1957 † - (TAINOCERATIDAE) (FOSSIL)
- abulati, Uroteuthis abulati (W. Adam, 1955) - (LOLIGINIDAE)
- abulati, Photololigo abulati W. Adam, 1955 - syn of: Uroteuthis abulati (W. Adam, 1955) - (LOLIGINIDAE)
- abulatti, Diodora ruppelli abulatti J.M.J. Christiaens, 1987 - (FISSURELLIDAE)
- abunaensis, Streptartemon abunaensis (F.C. Baker, 1913) - (STREPTAXIDAE)
- abundans, Gresslya abundans Kurushin, 1998 † - (CERATOMYIDAE) (FOSSIL)
- abundans, Chondrina arcadica abundans (C.A. Westerlund, 1894) - (CHONDRINIDAE)
- abundans, Diplommatina abundans W.J.M. Maassen, 2002 - (DIPLOMMATINIDAE)
- abundans, Mastus abundans W.J.M. Maassen, 1995 - (ENIDAE)
- abundans, Alveinus abundans A.A. Olsson, 1964 † - syn of: Alveinus rotundus W.H. Dall, 1900 † - (KELLIELLIDAE) (FOSSIL)
- abundans, Orthonychia abundans J. Wanner, 1922 † - syn of: Platyceras abundans (J. Wanner, 1922 †) - (ORTHONYCHIIDAE) (FOSSIL)
- abundans, Platyceras abundans (J. Wanner, 1922 †) - (PLATYCERATIDAE) (FOSSIL)
- abundans, Cyclopites abundans P.A. Zhuravleva, 1972 † - syn of: Evlanoceras evlanense (Nalivkin, 1947 †) - (POLYELASMOCERATIDAE) (FOSSIL)
- abundans, Crassispira abundans T.A. Conrad, 1840 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- abundanta, Ringicula abundanta S. Kiel & K. Bandel, 2001 † - (RINGICULIDAE) (FOSSIL)
- abundata, Schwartziella abundata E. Rolán & L. Luque, 2000 - (ZEBINIDAE)
- abundum, Stenopoceras abundum (Miller & A. Thomas, 1936 †) - (GRYPOCERATIDAE) (FOSSIL)
- abundum, Knightoceras abundum Miller & A. Thomas, 1936 † - syn of: Stenopoceras abundum (Miller & A. Thomas, 1936 †) - (KONINCKIOCERATIDAE) (FOSSIL)
- abunkumensis, Somarctica abunkumensis Tamura 1960 † - (ARCTICIDAE) (FOSSIL)
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