- Afsharius, Genus Afsharius M. Huber, Langleit & Kreipl, 2015 (TELLINIDAE)
- afthonodontia, Discartemon afthonodontia T. Siriboon & S. Panha, 2014 - (STREPTAXIDAE)
- afzelii, Liostomia afzelii A. Warén, 1991 - (PYRAMIDELLIDAE)
- agachada, Bactrocythara agachada E. Rolán, J. Otero-Schmidt & F. Fernandes, 1994 - (MANGELIIDAE)
- agadesensis, Tuaregunio agadesensis (D. Mongin, 1963 †) - (UNIONIDAE) (FOSSIL)
- agadesensis, Lampsilis agadesensis D. Mongin, 1963 † - syn of: Tuaregunio agadesensis (D. Mongin, 1963 †) - (UNIONIDAE) (FOSSIL)
- agadirensis, Fusinus agadirensis R. Hadorn & E. Rolán, 1999 - (FASCIOLARIIDAE)
- agadirensis, Maroccopsis agadirensis M. Ghamizi, 1998 - (HYDROBIIDAE)
- agaetana, Hemicycla agaetana J.F. Mabille, 1883 - syn of: Hemicycla psathyra temperata (A. Mousson, 1872) - (HELICIDAE)
- Agagus, Genus Agagus F.P. Jousseaume, 1894 (TROCHIDAE)
- agagus, Agagus agagus F.P. Jousseaume, 1894 - (TROCHIDAE)
- Agalactochilus, Genus Agalactochilus Kadolsky, H. Binder & Neubauer, 2016 † (HELICIDAE) (FOSSIL)
- agalma, Pollia agalma E.A. Smith, 1906 - syn of: Pollia delicata (E.A. Smith, 1899) - (BUCCINIDAE)
- Agalma, syn of: Genus Polydontes P.D. Montfort, 1810 (CAMAENIDAE)
- agalma, Cancellaria agalma J.C. Melvill & R. Standen, 1901 - (CANCELLARIIDAE)
- agalma, Paradrillia agalma (E.A. Smith, 1906) - (HORAICLAVIDAE)
- agamedea, Spirotropis agamedea (W.H. Dall, 1919) - (DRILLIIDAE)
- agamedea, Antiplanes agamedea W.H. Dall, 1919 - syn of: Spirotropis agamedea (W.H. Dall, 1919) - (PSEUDOMELATOMIDAE)
- agamemnon, Austrochloritis agamemnon G.P.L.K. Gude, 1906 - (CAMAENIDAE)
- agana, Miralda agana (P. Bartsch, 1915) - (PYRAMIDELLIDAE)
- aganactica, Spirotropis aganactica (R.B. Watson, 1886) - (DRILLIIDAE)
- aganactica, Pleurotoma aganactica R.B. Watson, 1886 - syn of: Spirotropis aganactica (R.B. Watson, 1886) - (TURRIDAE)
- aganea, Syrnola aganea (P. Bartsch, 1915) - (PYRAMIDELLIDAE)
- aganea, Pyramidella aganea P. Bartsch, 1915 - syn of: Syrnola aganea (P. Bartsch, 1915) - (PYRAMIDELLIDAE)
- Aganides, Genus Aganides de Montfort, 1808 † (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- aganiticus, Nautilus aganiticus Schlotheim, 1820 † - syn of: Pseudaganides aganiticus (Schlotheim, 1820 †) - (NAUTILIDAE) (FOSSIL)
- aganiticus, Pseudaganides aganiticus (Schlotheim, 1820 †) - (PSEUDONAUTILIDAE) (FOSSIL)
- agapea, Jupiteria agapea (W.H. Dall, 1908) - (NUCULANIDAE)
- agapea, Jupiteria agapea W.H. Dall, 1908 - syn of: Jupiteria agapea (W.H. Dall, 1908) - (NUCULANIDAE)
- Agapella, Genus Agapella Hayami, 1965 † (ARCTICIDAE) (FOSSIL)
- agapeta, Gibberula agapeta (R.B. Watson, 1886) - (CYSTISCIDAE)
- agapeta, Marginella agapeta R.B. Watson, 1886 - syn of: Gibberula agapeta (R.B. Watson, 1886) - (MARGINELLIDAE)
- agapeta, Nassa agapeta R.B. Watson, 1882 - syn of: Nassarius agapetus (R.B. Watson, 1882) - (NASSARIIDAE)
- agapeta, Cingula agapeta (E.A. Smith, 1890) - (RISSOIDAE)
- agapeta, Rissoa agapeta E.A. Smith, 1890 - syn of: Cingula agapeta (E.A. Smith, 1890) - (RISSOIDAE)
- agapeta, Minolia agapeta J.C. Melvill & R. Standen, 1896 - syn of: Parminolia apicina (A.A. Gould, 1862) - (SOLARIELLIDAE)
- agapetus, Potamolithus agapetus H.A. Pilsbry, 1911 - (LITHOGLYPHIDAE)
- agapetus, Nassarius agapetus (R.B. Watson, 1882) - (NASSARIIDAE)
- Agapibittium, Genus Agapibittium Harzhauser & Kowalke, 2001 † (CERITHIIDAE) (FOSSIL)
- Agapilia, Genus Agapilia Harzhauser & Kowalke, 2001 † (NERITIDAE) (FOSSIL)
- agardhi, Cochlostoma agardhi N. Pini, 1884 - syn of: Cochlostoma septemspiralis (G.de Razoumowsky, 1789) - (COCHLOSTOMATIDAE)
- agardhi, Anisus agardhi Y.I. Starobogatov in L.A. Prozorova, 2003 - (PLANORBIDAE)
- Agardhia, Genus Agardhia G.P.L.K. Gude, 1911 (ARGNIDAE)
- Agardhia, syn of: Genus Argna A.E.M. Cossmann, 1889 (ARGNIDAE)
- Agardhiella, Subgenus Argna (Agardhiella) P. Hesse, 1923 (ARGNIDAE)
- agardhii, Ponentina agardhii P.M. Pallary, 1898 - syn of: Ponentina subvirescens (J.C. Bellamy, 1839) - (HYGROMIIDAE)
- agarhecta, Marstonia agarhecta F.G. Thompson, 1969 - (HYDROBIIDAE)
- agari, Berghia agari (W.M. Smallwood, 1910) - (AEOLIDIIDAE)
- agari, Facelina agari W.M. Smallwood, 1910 - syn of: Berghia agari (W.M. Smallwood, 1910) - (FACELINIDAE)
- agari, Islamia globulus agari (C. Altimira, 1960) - (HYDROBIIDAE)
- Agaria, syn of: Genus Cardiocardita H.E. Anton, 1838 (CARDITIDAE)
- agarista, Pleurotomaria agarista Billings, 1865 † - (PLEUROTOMARIIDAE) (FOSSIL)
- Agariste, Genus Agariste Monterosato, 1892 † (FISSURELLIDAE) (FOSSIL)
- agaroi, Theba agaroi A. Letourneux & J.R. Bourguignat, 1887 - syn of: Theba pisana (O.F. Müller, 1774) - (HELICIDAE)
- Agaronia, Genus Agaronia J.E. Gray, 1839 (OLIVIDAE)
- agaronia, Oliva agaronia P.L. Duclos, 1844 - syn of: Agaronia hiatula (J.F. Gmelin, 1791) - (OLIVIDAE)
- agasma, Splendrillia agasma B.C. Cotton, 1947 - syn of: Splendrillia woodsi (R.H. Beddome, 1883) - (DRILLIIDAE)
- Agasoma, Genus Agasoma Anderson & Martin, 1915 † (ORTHONEMIDAE) (FOSSIL)
- Agassiceras, Genus Agassiceras Hyatt, 1875 † (ARIETITIDAE) (FOSSIL)
- Agassitula, syn of: Genus Metula H. Adams & A. Adams, 1853 (BUCCINIDAE)
- agassizi, Alexandromenia agassizi H. Heath, 1911 - (AMPHIMENIIDAE)
- agassizi, Dolabella agassizi F.M. MacFarland, 1918 - syn of: Dolabella auricularia (J. Lightfoot, 1786) - (APLYSIIDAE)
- agassizi, Metula agassizi W.J. Clench & C.G. Aguayo, 1941 - syn of: Bartschia agassizi (W.J. Clench & C.G. Aguayo, 1941) - (BUCCINIDAE)
- agassizi, Bartschia agassizi (W.J. Clench & C.G. Aguayo, 1941) - (COLUBRARIIDAE)
- agassizi, Erosaria agassizi H.S. Ladd, 1934 - syn of: Erosaria helvola (C. Linnaeus, 1758) - (CYPRAEIDAE)
- agassizi, Dentalium agassizi H.A. Pilsbry & B. Sharp, 1897 - (DENTALIIDAE)
- agassizi, Columenoceras agassizi (Barrande, 1866 †) - (GEISONOCERATIDAE) (FOSSIL)
- agassizi, Meiocardia agassizi W.H. Dall, 1886 † - (GLOSSIDAE) (FOSSIL)
- agassizi, Cardiolucina agassizi (O.G. Michelotti, 1839 †) - (LUCINIDAE) (FOSSIL)
- agassizi, Cinctoceras agassizi (Barrande, 1865 †) - (MANDALOCERATIDAE) (FOSSIL)
- agassizi, Aperostoma agassizi C. de la Torre, P. Bartsch & J.P.E. Morrison, 1942 - (NEOCYCLOTIDAE)
- agassizi, Orthoceras agassizi Barrande, 1866 † - (ORTHOCERATIDAE) (FOSSIL)
- agassizi, Eutudora agassizi (J.G.F. de Charpentier in L. Pfeiffer, 1852) - (POMATIIDAE)
- agassizi, Pyramidella agassizi (H.A. Pilsbry, 1906) - (PYRAMIDELLIDAE)
- agassizi, Pleurotomella agassizi A.E. Verrill & S. Smith, 1880 - syn of: Gymnobela agassizii (A.E. Verrill & S. Smith, 1880) - (RAPHITOMIDAE)
- agassizi, Anamenia agassizi (H. Heath, 1918) - (STROPHOMENIIDAE)
- agassizi, Obeliscus agassizi H.A. Pilsbry, 1906 - (SUBULINIDAE)
- agassizi, Pleurotoma agassizi A.E. Verrill & S. Smith, 1880 - syn of: Gymnobela agassizii (A.E. Verrill & S. Smith, 1880) - (TURRIDAE)
- agassizi permagna, Pleurotomella agassizi permagna W.H. Dall, 1890 - syn of: Gymnobela agassizii (A.E. Verrill & S. Smith, 1880) - (RAPHITOMIDAE)
- agassiziana, Blandia agassiziana (C.B. Adams, 1851) - (HELICINIDAE)
- agassizii, Borsonella agassizii (W.H. Dall, 1908) - (BORSONIIDAE)
- agassizii, Agatrix agassizii (W.H. Dall, 1889) - (CANCELLARIIDAE)
- agassizii, Ensio agassizii (Lycett, 1850) † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- agassizii, Ceratites agassizii (Klipstein, 1843 †) - (CERATITIDAE) (FOSSIL)
- agassizii, Cerion agassizii W.H. Dall, 1894 - (CERIONIDAE)
- agassizii, Felimare agassizii (L.S.R. Bergh, 1894) - (CHROMODORIDIDAE)
- agassizii, Chromodoris agassizii L.S.R. Bergh, 1894 - syn of: Felimare agassizii (L.S.R. Bergh, 1894) - (CHROMODORIDIDAE)
- agassizii, Coccocrater agassizii (W.H. Dall, 1908) - (COCCULINIDAE)
- agassizii, Conus agassizii W.H. Dall, 1886 - syn of: Conasprella mindana (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- agassizii, Gadila agassizii (W.H. Dall, 1881) - (GADILIDAE)
- agassizii, Meiocardia agassizii W.H. Dall, 1886 - syn of: Glossocardia agassizii (W.H. Dall, 1886) - (GLOSSIDAE)
- agassizii, Acesta agassizii W.H. Dall, 1902 - syn of: Acesta patagonica (W.H. Dall, 1902) - (LIMIDAE)
- agassizii, Mastigoteuthis agassizii A.E. Verrill, 1881 - (MASTIGOTEUTHIDAE)
- agassizii, Opisthoteuthis agassizii A.E. Verrill, 1883 - (OPISTHOTEUTHIDAE)
- agassizii, Pleurobranchaea agassizii L.S.R. Bergh, 1897 - (PLEUROBRANCHAEIDAE)
- agassizii, Berthella agassizii (F.M. MacFarland, 1909) - (PLEUROBRANCHIDAE)
- agassizii, Gymnobela agassizii (A.E. Verrill & S. Smith, 1880) - (RAPHITOMIDAE)
- agassizii, Solemya agassizii W.H. Dall, 1908 - syn of: Acharax johnsoni (W.H. Dall, 1891) - (SOLEMYIDAE)
- agassizii, Solemya agassizii W.H. Dall, 1908 - syn of: Acharax johnsoni (W.H. Dall, 1891) - (SOLEMYIDAE)
- agassizii, Glossocardia agassizii (W.H. Dall, 1886) - (TRAPEZIDAE)
- agassizii hatterasensis, Cadulus agassizii hatterasensis B. Sharp & H.A. Pilsbry, 1898 - syn of: Gadila agassizii (W.H. Dall, 1881) - (GADILIDAE)
- agassizii mexicana, Gymnobela agassizii mexicana (W.H. Dall, 1889) - (RAPHITOMIDAE)
- agassizii mexicana, Pleurotomella agassizii mexicana W.H. Dall, 1889 - syn of: Gymnobela agassizii mexicana (W.H. Dall, 1889) - (RAPHITOMIDAE)
- agassizii multiliratus, Conus agassizii multiliratus Böse, 1906 † - syn of: Dauciconus multiliratus (Böse, 1906 †) - (CONIDAE) (FOSSIL)
- agassizii permagna, Gymnobela agassizii permagna W.H. Dall, 1890 - syn of: Gymnobela agassizii (A.E. Verrill & S. Smith, 1880) - (RAPHITOMIDAE)
- agassizzii, Pseudonapaeus agassizzii (H. Milne-Edwards, 1880) - (ENIDAE)
- agastachys, Benthonellania agastachys P. Bouchet & A. Warén, 1993 - (RISSOIDAE)
- agastor, Nipponaphera agastor P. Bouchet & R.E. Petit, 2008 - (CANCELLARIIDAE)
- Agastrioceras, Genus Agastrioceras Schmidt, 1938 † (RETICULOCERATIDAE) (FOSSIL)
- agastyches, Benthonellania agastyches P. Bouchet & A. Warén, 1993 - syn of: Benthonellania agastachys P. Bouchet & A. Warén, 1993 - (RISSOIDAE)
- agata, Volvarina agata C.F. Laseron, 1957 - syn of: Volvarina agatha (C.F. Laseron, 1957) - (MARGINELLIDAE)
- agatha, Mitrella agatha (J.C. Melvill, 1904) - (COLUMBELLIDAE)
- agatha, Iredalea agatha (W.H. Dall, 1918) - (DRILLIIDAE)
- agatha, Fusinus agatha (L.R.L. Simone & D. Abbate, 2005) - (FASCIOLARIIDAE)
- agatha, Volvarina agatha (C.F. Laseron, 1957) - (MARGINELLIDAE)
- Agatha, Subgenus Syrnola (Agatha) A. Adams, 1860 (PYRAMIDELLIDAE)
- agatha, Turbonilla agatha K.H.J. Thiele, 1925 - (PYRAMIDELLIDAE)
- agathe, Agatrix agathe B.M. Landau, R.E. Petit & F. Da Silva, 2012 † - (CANCELLARIIDAE) (FOSSIL)
- agathensis, Trochus agathensis C.A. Récluz, 1843 - syn of: Gibbula umbilicalis (E.M. Da Costa, 1778) - (TROCHIDAE)
- Agathiceras, Genus Agathiceras Gemmellaro , 1887 † (AGATHICERATIDAE) (FOSSIL)
- AGATHICERATIDAE Arthaber, 1911 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-GONIATITIDA [Order]-AGATHICERATOIDEA [Superfamily]) (FOSSIL)
- agathida, Tindariopsis agathida (W.H. Dall, 1890) - (BATHYSPINULIDAE)
- agathida, Malletia agathida W.H. Dall, 1890 - syn of: Tindariopsis agathida (W.H. Dall, 1890) - (MALLETIIDAE)
- agathida, Tindaria agathida W.H. Dall, 1890 - syn of: Tindariopsis agathida (W.H. Dall, 1890) - (TINDARIIDAE)
- agathina, Limicolaria agathina H.A. Pilsbry, 1904 - (ACHATINIDAE)
- Agathina, syn of: Genus Achatina J.B.P.A. Lamarck, 1799 (ACHATINIDAE)
- Agathirses, syn of: Genus Tenagodus J.É. Guettard, 1770 (SILIQUARIIDAE)
- Agathirses, syn of: Genus Tenagodus J.É. Guettard, 1770 (SILIQUARIIDAE)
- Agathistoma, Subgenus Tegula (Agathistoma) A.A. Olsson & A. Harbison, 1953 (TEGULIDAE)
- Agathodonta, Genus Agathodonta Cossmann, 1918 † (CHILODONTIDAE) (FOSSIL)
- agathostoma, Rissoina agathostoma A.E.M. Cossmann, 1919 † - (RISSOINIDAE) (FOSSIL)
- Agathothoma, syn of: Genus Agathotoma A.E.M. Cossmann, 1899 (MANGELIIDAE)
- Agathotoma, Genus Agathotoma A.E.M. Cossmann, 1899 (MANGELIIDAE)
- Agathylla, Genus Agathylla H. Adams & A. Adams, 1855 (CLAUSILIIDAE)
- Agathyllina, Subgenus Agathylla (Agathyllina) H. Nordsieck, 1969 (CLAUSILIIDAE)
- Agatrix, Genus Agatrix R. Petit, 1967 (CANCELLARIIDAE)
- agava, Strophiops neglecta agava C.J. Maynard, 1913 - (CERIONIDAE)
- agavaneglecta, Strophiops agavaneglecta C.J. Maynard, 1913 - syn of: Strophiops neglecta agava C.J. Maynard, 1913 - (CERIONIDAE)
- agave, Raphistomina agave (Billings, 1865 †) - (HOLOPEIDAE) (FOSSIL)
- agavophila, Humboldtiana agavophila W.L. Pratt, 1971 - (HUMBOLDTIANIDAE)
- Agelasina, Genus Agelasina Riedel, 1932 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- agelensis, Cernuella agelensis E. Caziot, 1910 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- agenea, Arene agenea W.H. Dall, 1892 † - (ARENEIDAE) (FOSSIL)
- ageneris, Aegides ageneris L.Y. Jiang, 1980 † - (MAIKHANELLIDAE) (FOSSIL)
- agenna, Otala agenna J.R. Bourguignat, 1883 - syn of: Otala lactea (O.F. Müller, 1774) - (HELICIDAE)
- agenor, Ceratites agenor Münster, 1834 † - syn of: Mojsvarites agenor (Münster, 1834 †) - (CERATITIDAE) (FOSSIL)
- agenor, Mojsvarites agenor (Münster, 1834 †) - (USSURITIDAE) (FOSSIL)
- agenta, Mitrella agenta M. Harzhauser & T. Kowalke, 2002 † - (COLUMBELLIDAE) (FOSSIL)
- Agerchlamys, Genus Agerchlamys Damborenea , 1993 † (PECTINIDAE) (FOSSIL)
- agerensis, Chondrina agerensis C. Altimira, 1967 - syn of: Chondrina farinesii sexplicata A. Bofill, 1886 - (CHONDRINIDAE)
- ageri, Conasprella ageri J.R. Hendricks, 2015 † - (CONIDAE) (FOSSIL)
- ageri, Buccinofusus ageri Abbass, 1967 † - (FASCIOLARIIDAE) (FOSSIL)
- ageri, Turritella ageri Abbass, 1962 † - (TURRITELLIDAE) (FOSSIL)
- Ageria, Genus Ageria Abbass, 1973 † (PROCERITHIIDAE) (FOSSIL)
- Agerostrea, Genus Agerostrea Vialov, 1936 † (OSTREIDAE) (FOSSIL)
- agervallensis, Cerithium agervallensis Dominici & T. Kowalke, 2014 † - (CERITHIIDAE) (FOSSIL)
- agesilaus, Albinaria voithii agesilaus (E.C. Von Martens, 1873) - (CLAUSILIIDAE)
- agger, Cranopsis agger (R.B. Watson, 1883) - (FISSURELLIDAE)
- agger, Granulina agger (R.B. Watson, 1886) - (MARGINELLIDAE)
- aggesta, Quadriplicata aggesta (O. Böttger, 1878) - (CLAUSILIIDAE)
- aggesta praegracilis, Clausilia aggesta praegracilis O.W. Von Rosen, 1914 - syn of: Quadriplicata aggesta (O. Böttger, 1878) - (CLAUSILIIDAE)
- aggesta stauropolitana, Quadriplicata aggesta stauropolitana (O.W. Von Rosen, 1901) - (CLAUSILIIDAE)
- agglutinans, Cyclamastra agglutinans (W. Newcomb, 1853) - (AMASTRIDAE)
- agglutinans, Eufistulana agglutinans (G.P. Deshayes, 1855) - (GASTROCHAENIDAE)
- agglutinans, Geophorus agglutinans (G.B. Sowerby, 1842) - (HELICINIDAE)
- agglutinans, Lioberus agglutinans (F.J. Cantraine, 1835) - (MYTILIDAE)
- agglutinans, Modiolus agglutinans F.J. Cantraine, 1835 - syn of: Lioberus agglutinans (F.J. Cantraine, 1835) - (MYTILIDAE)
- agglutinans, Penicillus agglutinans J.B.P.A. Lamarck, 1818 - syn of: Foegia novaezelandiae (J.G. Bruguière, 1789) - (PENICILLIDAE)
- agglutinans, Melanoides agglutinans J.C. Bequaert & W.J. Clench, 1941 - (THIARIDAE)
- agglutinans, Trochus agglutinans G.L.C.F.D. Cuvier, 1849 - syn of: Xenophora cerea (L.A. Reeve, 1845) - (TROCHIDAE)
- agglutinans, Xenophora agglutinans (J.B.P.A. Lamarck, 1804) - (XENOPHORIDAE)
- agglutinans albocarinata, Geophorus agglutinans albocarinata (O.F. von Möllendorff, 1891) - (HELICINIDAE)
- agglutinans negrosensis, Geophorus agglutinans negrosensis P. Bartsch, 1918 - (HELICINIDAE)
- agglutinans romblonensis, Geophorus agglutinans romblonensis P. Bartsch, 1918 - (HELICINIDAE)
- agglutinans siquijorensis, Geophorus agglutinans siquijorensis P. Bartsch, 1918 - (HELICINIDAE)
- agglutinans tagbilleranus, Geophorus agglutinans tagbilleranus P. Bartsch, 1918 - (HELICINIDAE)
- aggregata, Lophotheca aggregata Z.X. Qian, 1989 † - (GRACILITHECIDAE) (FOSSIL)
- Aghatina, syn of: Genus Achatina J.B.P.A. Lamarck, 1799 (ACHATINIDAE)
- aghdarbandensis, Gymnites aghdarbandensis Krystyn & Tatzreiter, 1991 † - (GYMNITIDAE) (FOSSIL)
- Aghdarbandites, Genus Aghdarbandites Krystyn & Tatzreiter, 1991 † (BEYRICHITIDAE) (FOSSIL)
- agheilensis, Cerastoderma agheilensis H.R. Kaltenbach, 1949 - syn of: Cerastoderma glaucum (J.G. Bruguière, 1789) - (CARDIIDAE)
- agile, Antalis agile G.O. Sars, 1872 - syn of: Antalis agilis (G.O. Sars in G.O. Sars, 1872) - (DENTALIIDAE)
- agilis, Antalis agilis (G.O. Sars in G.O. Sars, 1872) - (DENTALIIDAE)
- agilis, Scintilla agilis C.F. Lützen & C. Nielsen, 2005 - (GALEOMMATIDAE)
- agilis, Miltha agilis Finlay & J. Marwick, 1937 † - (LUCINIDAE) (FOSSIL)
- agilis, Hormotoma agilis Billings, 1865 † - (MURCHISONIIDAE) (FOSSIL)
- agilis, Onykia agilis A.E. Verrill, 1885 - syn of: Onykia carriboea C.A. Lesueur, 1821 - (ONYCHOTEUTHIDAE)
- agilis, Spirostylus agilis (Stoppani, 1858 †) - (SPIROSTYLIDAE) (FOSSIL)
- agilis, Tellina agilis (W. Stimpson, 1857) - (TELLINIDAE)
- agilis, Angulus agilis W. Stimpson, 1857 - syn of: Tellina agilis (W. Stimpson, 1857) - (TELLINIDAE)
- Agina, syn of: Genus Hiatella L.A.G. d'A. Bosc, 1801 (HIATELLIDAE)
- agina, Dallora agina (A.A. Olsson, 1942 †) - (TURRIDAE) (FOSSIL)
- aginensis, Gryphaea aginensis (R. Tournouer, 1880 †) - (GRYPHAEIDAE) (FOSSIL)
- aginnica, Cernuella aginnica (É.A.A. Locard, 1882) - (HYGROMIIDAE)
- Agiosspeleikos, syn of: Genus Tsoukatosia E. Gittenberger, 2000 (CLAUSILIIDAE)
- agitabile, Epitonium agitabile (F.P. Jousseaume, 1912) - (EPITONIIDAE)
- agitata, Pseudoglandina agitata W.K. Weyrauch, 1967 - syn of: Simpulopsis citrinovitrea (S. Moricand, 1836) - (SIMPULOPSIDAE)
- Agladrillia, Genus Agladrillia W.P. Woodring, 1928 (DRILLIIDAE)
- aglae, Volvarina aglae J. Espinosa & J.A. Ortea, 2015 - (MARGINELLIDAE)
- Aglaia, syn of: Genus Aglaja S.A. Renier, 1807 (AGLAJIDAE)
- aglaia, Clavus aglaia (W.H. Dall, 1918) - (DRILLIIDAE)
- aglaia, Everettia aglaia (L. Pfeiffer, 1854) - (DYAKIIDAE)
- aglaia, Opalia aglaia (P. Bartsch, 1915) - (EPITONIIDAE)
- aglaia, Charitodoron aglaia J.R. le B. Tomlin, 1932 - syn of: Charitodoron agulhasensis (K.H.J. Thiele, 1925) - (MITRIDAE)
- Aglaia, syn of: Genus Monadenia H.A. Pilsbry, 1895 (MONADENIIDAE)
- aglaia, Polyspirella aglaia (P. Bartsch, 1915) - (PYRAMIDELLIDAE)
- aglaia, Nisiturris aglaia (P. Bartsch, 1915) - syn of: Polyspirella aglaia (P. Bartsch, 1915) - (PYRAMIDELLIDAE)
- aglaia, Kermia aglaia (J.C. Melvill, 1904) - (RAPHITOMIDAE)
- aglaia, Pleurotoma aglaia W.H. Dall, 1918 - syn of: Clavus aglaia (W.H. Dall, 1918) - (TURRIDAE)
- aglais, Ziba aglais B.Q. Li, S.P. Zhang & X.Z. Li, 2005 - (MITRIDAE)
- Aglaja, Genus Aglaja S.A. Renier, 1807 (AGLAJIDAE)
- aglaja, Macrochlamys aglaja (L. Pfeiffer) - (ARIOPHANTIDAE)
- aglaja, Alvania aglaja C. De Stefani & D. Pantanelli, 1888 † - (RISSOIDAE) (FOSSIL)
- Aglaja, syn of: Genus Lysinoe H. Adams & A. Adams, 1855 (XANTHONYCHIDAE)
- AGLAJIDAE Pilsbry, 1895 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-CEPHALASPIDEA [Order]-PHILINOIDEA [Superfamily])
- Aglaoglypta, Genus Aglaoglypta Knight, 1942 † (BELLEROPHONTIDAE) (FOSSIL)
- aglaometa, Cernuella aglaometa J.F. Mabille, 1882 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- aglaophanes, Clionella aglaophanes (R.B. Watson, 1882) - (CLAVATULIDAE)
- aglaophanes, Globidrillia aglaophanes R.B. Watson, 1882 - syn of: Clionella aglaophanes (R.B. Watson, 1882) - (DRILLIIDAE)
- aglaophanes, Pleurotoma aglaophanes R.B. Watson, 1882 - syn of: Clionella aglaophanes (R.B. Watson, 1882) - (TURRIDAE)
- aglaopheniae, Proneomenia aglaopheniae A. Kowalevsky & A. Marion, 1887 - syn of: Rhopalomenia aglaopheniae (A. Kowalevsky & A. Marion, 1887) - (PRONEOMENIIDAE)
- aglaopheniae, Rhopalomenia aglaopheniae (A. Kowalevsky & A. Marion, 1887) - (RHOPALOMENIIDAE)
- aglaos, Morula aglaos (R. Houart, 1995) - (MURICIDAE)
- aglaos, Habromorula aglaos (R. Houart, 1995) - syn of: Morula aglaos (R. Houart, 1995) - (MURICIDAE)
- aglaurae, Antigona aglaurae A. Brongniart, 1823 † - (VENERIDAE) (FOSSIL)
- aglena, Cecilioides aglena J.R. Bourguignat, 1860 - syn of: Cecilioides acicula (O.F. Müller, 1774) - (FERUSSACIIDAE)
- aglietti, Osilinus aglietti S.A. Renier, 1804 - syn of: Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- aglikitschensis, Glycymerita aglikitschensis Devjatilova, 1981 † - (GLYCYMERIDIDAE) (FOSSIL)
- aglikitschensis, Hataiyoldia aglikitschensis Devjatilova, 1981 † - (SAREPTIDAE) (FOSSIL)
- Aglotrochus, Subgenus Humboldtiana (Aglotrochus) F.G. Thompson, 2006 (HUMBOLDTIANIDAE)
- aglypta, Trochonanina aglypta (W.L.H. Dohrn, 1866) - (UROCYCLIDAE)
- agna, Cardiola agna Barrande, 1881 † - (CARDIOLIDAE) (FOSSIL)
- agna, Hemizaptyx pinto agna (H.A. Pilsbry, 1902) - (CLAUSILIIDAE)
- agna, Cernuella agna P. Hagenmüller in É.A.A. Locard, 1882 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- agna, Pseudorhaphitoma agna (J.C. Melvill & R. Standen, 1896) - (MANGELIIDAE)
- agna, Mangelia agna J.C. Melvill & R. Standen, 1896 - syn of: Pseudorhaphitoma agna (J.C. Melvill & R. Standen, 1896) - (MANGELIIDAE)
- agna figusi, Cardiola agna figusi Kríž & Serpagli, 1993 † - (CARDIOLIDAE) (FOSSIL)
- agnastha, Anadara agnastha W.P. Woodring, 1925 † - (ARCIDAE) (FOSSIL)
- agnata, Bathytoma agnata C. Hedley & W.F. Petterd, 1906 - (BORSONIIDAE)
- agnata, Medora agnata (L. Pfeiffer, 1842) - (CLAUSILIIDAE)
- agnata, Helix agnata M. Paulucci, 1881 - syn of: Cingulifera cingulatum carrarensis (P. von Ströbel, 1852) - (HELICIDAE)
- agnata, Trochoidea agnata B. Ziegler - syn of: Trochoidea pyramidata (J.P.R. Draparnaud, 1805) - (HYGROMIIDAE)
- agnata, Holandriana holandrii agnata C. Pfeiffer, 1828 - (PLEUROCERIDAE)
- agnata cognata, Medora agnata cognata (O. Böttger, 1877) - (CLAUSILIIDAE)
- agnata delimaeformis, Medora agnata delimaeformis H. Nordsieck, 1970 - (CLAUSILIIDAE)
- agnata porcellanea, Medora agnata porcellanea (C.A. Westerlund, 1898) - (CLAUSILIIDAE)
- Agnathodonta, syn of: Genus Agathodonta Cossmann, 1918 † (CHILODONTIDAE) (FOSSIL)
- agnatus, Arcestes agnatus Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- agnatus, Terebralia agnatus J.F. Gmelin, 1791 - syn of: Terebralia palustris (C. Linnaeus, 1767) - (POTAMIDIDAE)
- agnes, Spinosipella agnes L.R.L. Simone & C.M. Cunha, 2008 - (VERTICORDIIDAE)
- agnesae, Dermomurex agnesae E.H. Vokes, 1995 - (MURICIDAE)
- agnesae, Macromphalus agnesae J.M. Pacaud & Pons, 2015 † - (VANIKORIDAE) (FOSSIL)
- agnesia, Buccinulum agnesia H. Strebel, 1905 - syn of: Meteuthria martensi (H. Strebel, 1905) - (BUCCINIDAE)
- agnesia, Pyrene agnesia Auct. non H. Strebel, 1905 - syn of: Amphissa cancellata (Z.J.A. De Castellanos, 1979) - (COLUMBELLIDAE)
- Agnesia, Genus Agnesia de Koninck, 1883 † (PORCELLIIDAE) (FOSSIL)
- agnesiana, Mitrella agnesiana J.C. Melvill & R. Standen, 1901 - syn of: Mitrella cartwrighti (J.C. Melvill, 1897) - (COLUMBELLIDAE)
- agnesiana, Brachypodella agnesiana C.B. Adams, 1849 - (UROCOPTIDAE)
- agnessense, Speetoniceras agnessense Imlay, 1960 † - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- agnevoensis, Ostrea agnevoensis L. Krishtofovich, 1957 ex Lautenschläger MS † - (OSTREIDAE) (FOSSIL)
- agnewi, Roblinella agnewi (C.M.D.E. Legrand, 1871) - (CHAROPIDAE)
- agnewi, Helix agnewi C.M.D.E. Legrand, 1871 - syn of: Roblinella agnewi (C.M.D.E. Legrand, 1871) - (HELICIDAE)
- agnewi, Panopea agnewi J.E. Tenison-Woods, 1876 † - (HIATELLIDAE) (FOSSIL)
- agnewi, Paradrillia agnewi J.E. Tenison-Woods, 1879 - syn of: Vexitomina coxi (G.F. Angas, 1867) - (HORAICLAVIDAE)
- agnewi, Onoba agnewi (J.E. Tenison-Woods, 1877) - (RISSOIDAE)
- Agnewia, Subgenus Thais (Agnewia) J.E. Tenison-Woods, 1878 (MURICIDAE)
- Agniesella, Genus Agniesella Cossmann, 1909 † (PORTLOCKIELLIDAE) (FOSSIL)
- agnitum, Phalium agnitum T. Iredale, 1927 - syn of: Phalium areola (C. Linnaeus, 1758) - (CASSIDAE)
- Agnocardia, Genus Agnocardia C.C. Stewart, 1930 † (CARDIIDAE) (FOSSIL)
- Agnomyax, Genus Agnomyax C.C. Stewart, 1930 (TELLINIDAE)
- agnostica, Pleurotomaria agnostica Beede, 1907 † - syn of: Apachella capertoni (Beede, 1907 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- agonia, Mangilia agonia W.H. Dall, 1890 - syn of: Xanthodaphne agonia (W.H. Dall, 1890) - (MANGELIIDAE)
- agonia, Xanthodaphne agonia (W.H. Dall, 1890) - (RAPHITOMIDAE)
- agonia altina, Xanthodaphne agonia altina (W.H. Dall, 1908) - (RAPHITOMIDAE)
- Agoniatites, Genus Agoniatites Meek , 1877 † (AGONIATITIDAE) (FOSSIL)
- AGONIATITIDA (UNASSIGNED) - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AGONIATITIDA [Order]) (FOSSIL)
- AGONIATITIDAE Holzapfel, 1899 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AGONIATITIDA [Order]-AGONIATITOIDEA [Superfamily]) (FOSSIL)
- agoniatum, Caecum agoniatum L. de Folin, 1867 - (CAECIDAE)
- Agonisca, Genus Agonisca Fleming, 1963 † (MYOPHORIIDAE) (FOSSIL)
- agonistes, Turbo agonistes W.H. Dall & W.H. Ochsner, 1928 - syn of: Turbo scitulus (W.H. Dall, 1919) - (TURBINIDAE)
- agonostoma, Succinea agonostoma H.C. Küster, 1853 - syn of: Succinella oblonga (J.P.R. Draparnaud, 1801) - (SUCCINEIDAE)
- agostinhoensis, Discula polymorpha agostinhoensis H.W. Waldén, 1983 - (HYGROMIIDAE)
- agostinhoi, Drouetia agostinhoi Frias Martins, 1981 - (OXYCHILIDAE)
- agostyani, Simoceras agostyani Fozy & al., 2013 † - (SIMOCERATIDAE) (FOSSIL)
- agraciada, Stegocoelia agraciada B.S. Kues & Batten, 2001 † - (GONIASMATIDAE) (FOSSIL)
- agraciada, Hypergonia agraciada B.S. Kues & Batten, 2001 † - (ORTHONEMIDAE) (FOSSIL)
- Agrafia, Genus Agrafia M. Szarowska & A. Falniowski, 2011 (HYDROBIIDAE)
- agraria, Lirophora agraria White, 1887 † - (VENERIDAE) (FOSSIL)
- Agraulina, syn of: Genus Amphorella R.T. Lowe, 1852 (FERUSSACIIDAE)
- agraulus, Planorbis agraulus J.R. Bourguignat, 1864 - (PLANORBIDAE)
- agrawali, Mantelliceras agrawali M. Collignon, 1964 † - syn of: Mantelliceras saxbii (Sharpe, 1857 †) - (ACANTHOCERATIDAE) (FOSSIL)
- Agrawalimya, Genus Agrawalimya Singh & al., 1982 † (PHOLADOMYIDAE) (FOSSIL)
- agrenon, Anhuiconus agrenon Vendrasco & al., 2010 † - (HELCIONELLIDAE) (FOSSIL)
- agrensis, Cyrena agrensis T. Prime, 1861 - syn of: Corbicula striatella G.P. Deshayes, 1854 - (CYRENIDAE)
- agreste, Agriolimax agreste (C. Linnaeus, 1758) - (AGRIOLIMACIDAE)
- agresticulus, Agriolimax agresticulus H.R. Simroth, 1894 - syn of: Plathystimulus subagreste (H.R. Simroth, 1893) - (AGRIOLIMACIDAE)
- agrestina, Cerion agrestina C.J. Maynard, 1894 - (CERIONIDAE)
- agrestior, Austrofusus glans agrestior C.C. Finlay, 1927 - (BUCCINIDAE)
- agrestis, Agriolimax agrestis Auct. non C. Linnaeus, 1758 - syn of: Deroceras reticulatum (O.F. Müller, 1774) - (AGRIOLIMACIDAE)
- agrestis, Clausilia agrestis A. Moquin-Tandon, 1856 - syn of: Clausilia rugosa reboudii D. Dupuy, 1850 - (CLAUSILIIDAE)
- agrestis, Conus agrestis O.A.L. Mörch, 1850 - syn of: Dendroconus buxeus loroisii L.C. Kiener, 1846 - (CONIDAE)
- agrestis, Keraea agrestis T.V. Wollaston, 1878 - syn of: Keraea garachicoensis (T.V. Wollaston, 1878) - (DISCIDAE)
- agrestis, Austrodrillia agrestis (J.C. Verco, 1909) - (HORAICLAVIDAE)
- agrestis, Xerotricha agrestis E. Caziot, 1910 - syn of: Xerotricha apicina (J.B.P.A. Lamarck, 1822) - (HYGROMIIDAE)
- agrestis, Limax agrestis C. Linnaeus, 1758 - syn of: Agriolimax agreste (C. Linnaeus, 1758) - (LIMACIDAE)
- agrestis, Brotia agrestis (L.A. Reeve, 1860) - (PACHYCHILIDAE)
- agrestis, Troschelvindex agrestis (L. Pfeiffer, 1862) - (POMATIIDAE)
- agrestis, Pyrgiscus agrestis T.H. Aldrich, 1911 † - (PYRAMIDELLIDAE) (FOSSIL)
- agrestis, Melania agrestis L.A. Reeve, 1860 - syn of: Brotia agrestis (L.A. Reeve, 1860) - (THIARIDAE)
- agrestis, Trochus agrestis R.A. Philippi, 1843 - syn of: Calliostoma zizyphinum (C. Linnaeus, 1758) - (TROCHIDAE)
- agrestis, Turbinella agrestis H.E. Anton, 1838 - syn of: Nicema subrostrata (J.E. Gray, 1839) - (TURBINELLIDAE)
- agrestis, Venus agrestis R.A. Philippi, 1845 - syn of: Globivenus fordii (L.G. Yates, 1890) - (VENERIDAE)
- agria, Narona agria W.C. Mansfield, 1930 † - (CANCELLARIIDAE) (FOSSIL)
- agria, Pusia agria C.N. Cate, 1963 - syn of: Pusia approximatum (W.H. Pease, 1860) - (COSTELLARIIDAE)
- agria, Ludwigia agria Buckman † - (GRAPHOCERATIDAE) (FOSSIL)
- agria, Mathilda agria (W.H. Dall, 1889) - (MATHILDIDAE)
- Agria, Genus Agria Matheron, 1878 † (MONOPLEURIDAE) (FOSSIL)
- agria, Peristichia agria W.H. Dall, 1889 - (PYRAMIDELLIDAE)
- agria, Gymnobela blakeana agria (W.H. Dall, 1889) - (RAPHITOMIDAE)
- agria, Moerella agria W.H. Dall, 1900 † - (TELLINIDAE) (FOSSIL)
- agricola, Strophiops agricola C.J. Maynard, 1919 - (CERIONIDAE)
- agricola, Gibberula agricola M.J. Faber, 2005 - (CYSTISCIDAE)
- agricolae, Thisbites agricolae Mojsisovics, 1893 † - (THISBITIDAE) (FOSSIL)
- agricolai, Acteonella agricolai E. Vidal, 1921 † - (ACTEONELLIDAE) (FOSSIL)
- agricolarum, Anodon agricolarum P.M. Heude, 1879 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- agrigentina, Papillifera agrigentina C.A. Westerlund, 1890 - syn of: Papillifera bidens affinis (R.A. Philippi, 1836) - (CLAUSILIIDAE)
- agrigentinum, Calliostoma agrigentinum G.S. Coen, 1936 - syn of: Calliostoma zizyphinum (C. Linnaeus, 1758) - (CALLIOSTOMATIDAE)
- agrillaceus, Tandonia agrillaceus J. Gassies, 1856 - syn of: Tandonia sowerbyi (A.E.J. Férussac, 1823) - (MILACIDAE)
- Agrioceras, Genus Agrioceras Zhuravleva, 1974 † (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- Agriodesma, syn of: Genus Entodesma B. Phillips, 1845 (LYONSIIDAE)
- agrioensis, Eriphyla agrioensis C.S. Weaver, 1931 - (ASTARTIDAE)
- agrioensis, Holcoptychites agrioensis C.S. Weaver, 1931 † - (NEOCOMITIDAE) (FOSSIL)
- agrioensis, Jeannoticeras agrioensis Aguirre-Urreta & Rawson, 2001 † - (OLCOSTEPHANIDAE) (FOSSIL)
- agrioensis, Pholadomya agrioensis C.S. Weaver, 1931 † - (PHOLADOMYIDAE) (FOSSIL)
- agrioensis, Tanzanitrigonia agrioensis (C.S. Weaver, 1931 †) - (RUTITRIGONIIDAE) (FOSSIL)
- agrioensis, Trigonia agrioensis C.S. Weaver, 1931 † - syn of: Tanzanitrigonia agrioensis (C.S. Weaver, 1931 †) - (TRIGONIIDAE) (FOSSIL)
- AGRIOLIMACIDAE H. Wagner, 1935 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-LIMACOIDEA [Superfamily])
- Agriolimax, Genus Agriolimax O.A.L. Mörch, 1865 (AGRIOLIMACIDAE)
- Agriolimax, syn of: Genus Deroceras C.S. Rafinesque, 1820 (AGRIOLIMACIDAE)
- Agriopleura, Genus Agriopleura Kühn, 1832 † (RADIOLITIDAE) (FOSSIL)
- Agriopoma, Subgenus Callocardia (Agriopoma) W.H. Dall, 1902 (VENERIDAE)
- agriorivensis, Cirsocerithium agriorivensis Cataldo, 2017 † - (PROCERITHIIDAE) (FOSSIL)
- agriotes, Cochlostoma crosseanum agriotes (C.A. Westerlund, 1879) - (COCHLOSTOMATIDAE)
- agripetus, Modiolus agripetus T. Iredale, 1939 - syn of: Modiolus auriculatus C.F.F. von Krauss, 1848 - (MYTILIDAE)
- agrius, Eubranchus agrius Er. Marcus, 1959 - (EUBRANCHIDAE)
- agronomica, Adrana agronomica C.J. Maury, 1924 † - (NUCULANIDAE) (FOSSIL)
- agronomica, Argopecten agronomica C.J. Maury, 1924 † - (PECTINIDAE) (FOSSIL)
- aguacalientensis, Sonorella aguacalientensis H.A. Pilsbry & J.H. Ferriss, 1915 - (HELMINTHOGLYPTIDAE)
- aguaclarensis, Hyotissa aguaclarensis (F. Hodson & al., 1927 †) - (GRYPHAEIDAE) (FOSSIL)
- aguaclarensis, Ostrea aguaclarensis F. Hodson & al., 1927 † - syn of: Hyotissa aguaclarensis (F. Hodson & al., 1927 †) - (OSTREIDAE) (FOSSIL)
- aguaclarensis, Amusium aguaclarensis F. Hodson, 1927 † - (PECTINIDAE) (FOSSIL)
- aguaclarensis paraguanensis, Hyotissa aguaclarensis paraguanensis (F. Hodson, 1931) - (GRYPHAEIDAE)
- aguaclarensis paraguanensis, Hyotissa aguaclarensis paraguanensis F. Hodson, 1931 - syn of: Hyotissa aguaclarensis paraguanensis (F. Hodson, 1931) - (GRYPHAEIDAE)
- aguadae, Laevapex aguadae (C. Goodrich & H. Van Der Schalie, 1937) - (PLANORBIDAE)
- aguadica, Scapharca aguadica L.G. Sheldon & C.J. Maury, 1920 † - (ARCIDAE) (FOSSIL)
- aguadillana, Mangilia aguadillana W.H. Dall & C.T. Simpson, 1901 - syn of: Lioglyphostoma aguadillanum (W.H. Dall & C.T. Simpson, 1901) - (MANGELIIDAE)
- aguadillana, Miraclathurella aguadillana (W.H. Dall & W. Stimpson, 1901) - (PSEUDOMELATOMIDAE)
- aguadillanum, Glyphostoma aguadillanum W.H. Dall & C.T. Simpson, 1901 - syn of: Lioglyphostoma aguadillanum (W.H. Dall & C.T. Simpson, 1901) - (CLATHURELLIDAE)
- aguadillanum, Lioglyphostoma aguadillanum (W.H. Dall & C.T. Simpson, 1901) - (PSEUDOMELATOMIDAE)
- aguadillanum minor, Lioglyphostoma aguadillanum minor (W.H. Dall & C.T. Simpson, 1901) - (PSEUDOMELATOMIDAE)
- aguadillensis, Licina aguadillensis (L. Pfeiffer, 1875) - (POMATIIDAE)
- aguadillensis, Orthaulax aguadillensis C.J. Maury, 1920 † - (STROMBIDAE) (FOSSIL)
- aguadillensis penoensis, Licina aguadillensis penoensis H.B. Baker, 1940 - (POMATIIDAE)
- aguadillensis turneri, Licina aguadillensis turneri (W.J. Clench) - (POMATIIDAE)
- aguadoresensis, Macroceramus aguadoresensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- Aguayodiscus, syn of: Genus Spirolaxis T.A. de M. Monterosato, 1913 (ARCHITECTONICIDAE)
- Aguayodiscus, syn of: Genus Spirolaxis T.A. de M. Monterosato, 1913 (ARCHITECTONICIDAE)
- aguayoi, Cerion aguayoi C. de la Torre & W.J. Clench, 1957 - (CERIONIDAE)
- aguayoi, Diodora aguayoi I. Pérez Farfante, 1943 - (FISSURELLIDAE)
- aguayoi, Prunum aguayoi J.A. Ortea & J. Espinosa, 1996 - syn of: Prunum lipei (P.W. Clover, 1990) - (MARGINELLIDAE)
- aguayoi, Farcimen seminudum aguayoi L.O. Alcalde, 1945 - (MEGALOMASTOMIDAE)
- aguayoi, Siratus aguayoi (W.J. Clench & I. Pérez Farfante, 1945) - (MURICIDAE)
- aguayoi, Liguus fasciatus aguayoi W.J. Clench, 1934 - (ORTHALICIDAE)
- aguayoi, Oxynoe aguayoi M.L. Jaume, 1945 - (OXYNOIDAE)
- aguayoi, Xenopoma aguayoi (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- aguayoi, Wrightudora aguayoi (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- aguayoi, Diplopoma architectonica aguayoi M.I. Sánchez Roig, 1951 - (POMATIIDAE)
- aguayoi, Chondrothyrium torrei aguayoi M.L. Jaume & Sánchez De Fuentes, 1943 - (POMATIIDAE)
- aguayoi, Opisthosiphon plicatum aguayoi M.I. Sánchez Roig, 1949 - (POMATIIDAE)
- aguayoi, Pleurotomella aguayoi (A. Carcelles, 1953) - (RAPHITOMIDAE)
- aguayoi, Vitrinella aguayoi (J.X. Corgan, 1968) - (TORNIDAE)
- aguayoi, Microceramus aguayoi C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- aguayoi, Tetrentodon aguayoi C. de la Torre & P. Bartsch, 1948 - (UROCOPTIDAE)
- aguayoi, Torrecoptis columbarii aguayoi C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- aguayoi, Volutifusus aguayoi (W.J. Clench, 1940) - (VOLUTIDAE)
- aguayoi bequaerti, Cerion aguayoi bequaerti C. de la Torre & W.J. Clench, 1932 - (CERIONIDAE)
- aguayoi guaicanamarensis, Wrightudora aguayoi guaicanamarensis (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- aguayoi luacesi, Wrightudora aguayoi luacesi M.I. Sánchez Roig, 1951 - (POMATIIDAE)
- aguayoi najazaensis, Wrightudora aguayoi najazaensis (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- Aguayotudora, Subgenus Tudora (Aguayotudora) C. de la Torre & P. Bartsch, 1941 (POMATIIDAE)
- aguelmousensis, Medioclymenia aguelmousensis W. Korn, 2002 † - (SPHENOCLYMENIIDAE) (FOSSIL)
- aguergourensis, Atlasica atlasica aguergourensis (P.M. Pallary, 1904) - (HELICIDAE)
- agueroi, Peronaeus agueroi W.K. Weyrauch, 1960 - (BULIMULIDAE)
- agueroi belltrani, Peronaeus agueroi belltrani W.K. Weyrauch, 1964 - (BULIMULIDAE)
- aguerreverei, Holospira aguerreverei G.D. Hanna & L.G. Hertlein, 1929 - (UROCOPTIDAE)
- aguila, Hertleinites aguila (Anderson, 1938 †) - (POLYPTYCHITIDAE) (FOSSIL)
- aguilae, Borsonia aguilae C.W. Cooke, 1928 † - (BORSONIIDAE) (FOSSIL)
- aguilari, Bostryx aguilari W.K. Weyrauch, 1967 - (BULIMULIDAE)
- aguilari, Chondrina aguilari C. Altimira, 1967 - syn of: Chondrina farinesii sexplicata A. Bofill, 1886 - (CHONDRINIDAE)
- aguilari, Limopsis aguilari Bose, 1906 † - (LIMOPSIDAE) (FOSSIL)
- Aguilaria, Genus Aguilaria J.D. Taylor & F.E. Wells, 1994 (PSEUDOMELATOMIDAE)
- aguilearae, Hoplites aguilearae Böse, 1923 † - (HOPLITIDAE) (FOSSIL)
- aguilerae, Goodhallites aguilerae (Böse, 1923 †) - (BRANCOCERATIDAE) (FOSSIL)
- aguilerae, Desmoceras aguilerae Böse, 1923 † - syn of: Pseudohaploceras liptoviense (Zeuschner, 1856 †) - (DESMOCERATIDAE) (FOSSIL)
- aguilerae, Schloenbachia aguilerae Böse, 1923 † - syn of: Goodhallites aguilerae (Böse, 1923 †) - (SCHLOENBACHIIDAE) (FOSSIL)
- aguilerae, Turritella aguilerae Bose, 1906 † - (TURRITELLIDAE) (FOSSIL)
- aguilerai, Conus aguilerai Engerrand & Urbina, 1910 † - (CONIDAE) (FOSSIL)
- aguilerai, Tylostoma aguilerai Alencaster de Cserna, 1956 † - (TYLOSTOMATIDAE) (FOSSIL)
- Aguilerella, Genus Aguilerella Chavan, 1951 † (BAKEVELLIIDAE) (FOSSIL)
- Aguileria, Genus Aguileria White, 1887 † (BAKEVELLIIDAE) (FOSSIL)
- aguilerianum, Bermudezsiphona aguilerianum (R. Arango & Y. Molina, 1876) - (POMATIIDAE)
- aguilerianum holguinense, Bermudezsiphona aguilerianum holguinense C.G. Aguayo, 1932 - syn of: Bermudezsiphona aguilerianum (R. Arango & Y. Molina, 1876) - (POMATIIDAE)
- aguilloni, Plagioptychus aguilloni (A.V.M.D. D'Orbigny, 1840 †) - (PLAGIOPTYCHIDAE) (FOSSIL)
- aguilonia, Witchellia aguilonia Imlay, 1964 † - syn of: Euaptetoceras amplectens S.S. Buckman, 1889 † - (HAMMATOCERATIDAE) (FOSSIL)
- aguinaldoi, Chrysallis lignaria aguinaldoi (P. Bartsch, 1919) - (BRADYBAENIDAE)
- aguirrei, Discoleus aguirrei A. Doering, 1884 - syn of: Peronaeus aguirrei (A. Doering, 1884) - (BOTHRIEMBRYONTIDAE)
- aguirrei, Peronaeus aguirrei (A. Doering, 1884) - (BULIMULIDAE)
- aguirrei azulensis, Peronaeus aguirrei azulensis (A. Doering, 1884) - (BULIMULIDAE)
- agujana, Euspira agujana (W.H. Dall, 1908) - (NATICIDAE)
- agujana, Ennucula agujana (W.H. Dall, 1908) - (NUCULIDAE)
- agujanus, Euspira agujanus W.H. Dall, 1908 - syn of: Euspira agujana (W.H. Dall, 1908) - (NATICIDAE)
- agulhaensis, Parviturbo agulhaensis (K.H.J. Thiele, 1925) - (SKENEIDAE)
- agulhasae, Clathrosepta agulhasae (A.H. Clarke, 1961) - (FISSURELLIDAE)
- agulhasae, Choristella agulhasae (A.H. Clarke, 1961) - (LEPETELLIDAE)
- agulhasae, Choristes agulhasae A.H. Clarke, 1961 - syn of: Choristella agulhasae (A.H. Clarke, 1961) - (NATICIDAE)
- agulhasae argentinae, Choristella agulhasae argentinae A.H. Clarke, 1961 - syn of: Trenchia argentinae (A.H. Clarke, 1961) - (LEPETELLIDAE)
- agulhasae argentinae, Choristes agulhasae argentinae A.H. Clarke, 1961 - syn of: Trenchia argentinae (A.H. Clarke, 1961) - (NATICIDAE)
- agulhasense, Dentalium agulhasense H.P. Plate, 1908 - syn of: Dentalium strigatum A.A. Gould, 1859 - (DENTALIIDAE)
- agulhasensis, Anatoma agulhasensis (K.H.J. Thiele, 1925) - (ANATOMIDAE)
- agulhasensis, Ancilla agulhasensis K.H.J. Thiele, 1925 - syn of: Ancilla ordinaria E.A. Smith, 1906 - (ANCILLARIIDAE)
- agulhasensis, Acar agulhasensis (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (ARCIDAE)
- agulhasensis, Digitaria agulhasensis (S.G.A. Jaeckel & K.H.J. Thiele, 1931) - (ASTARTIDAE)
- agulhasensis, Astarte agulhasensis S.G.A. Jaeckel & K.H.J. Thiele, 1931 - syn of: Digitaria agulhasensis (S.G.A. Jaeckel & K.H.J. Thiele, 1931) - (ASTARTIDAE)
- agulhasensis, Coripia agulhasensis (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (CARDITIDAE)
- agulhasensis, Venericardia agulhasensis K.H.J. Thiele & S.G.A. Jaeckel, 1931 - syn of: Coripia agulhasensis (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (CARDITIDAE)
- agulhasensis, Cerithiopsis agulhasensis (K.H.J. Thiele, 1925) - (CERITHIOPSIDAE)
- agulhasensis, Clionella agulhasensis K.H.J. Thiele, 1925 - syn of: Clionella vilma (K.H.J. Thiele, 1925) - (CLAVATULIDAE)
- agulhasensis, Collonista agulhasensis (K.H.J. Thiele, 1925) - (COLLONIIDAE)
- agulhasensis, Columbella agulhasensis K.H.J. Thiele, 1925 - syn of: Charitodoron agulhasensis (K.H.J. Thiele, 1925) - (COLUMBELLIDAE)
- agulhasensis, Elsius agulhasensis (S.G.A. Jaeckel & K.H.J. Thiele, 1931) - (CRASSATELLIDAE)
- agulhasensis, Cuspidaria agulhasensis K.H.J. Thiele & Jarckel, 1931 - syn of: Cuspidaria optima G.B. III Sowerby, 1904 - (CUSPIDARIIDAE)
- agulhasensis, Cylichnella agulhasensis (K.H.J. Thiele, 1925) - (CYLICHNIDAE)
- agulhasensis, Chuniscala agulhasensis (K.H.J. Thiele, 1925) - (EPITONIIDAE)
- agulhasensis, Eulima agulhasensis K.H.J. Thiele, 1925 - (EULIMIDAE)
- agulhasensis, Kilburnia agulhasensis (J.R. le B. Tomlin, 1932) - (FASCIOLARIIDAE)
- agulhasensis, Fauxulus agulhasensis H.A. Pilsbry, 1952 - (FAUXULIDAE)
- agulhasensis, Emarginula agulhasensis K.H.J. Thiele, 1925 - (FISSURELLIDAE)
- agulhasensis, Rochefortia agulhasensis S.G.A. Jaeckel & K.H.J. Thiele, 1931 - (LASAEIDAE)
- agulhasensis, Limatula agulhasensis (K.H.J. Thiele, 1920) - (LIMIDAE)
- agulhasensis, Limopsis agulhasensis K.H.J. Thiele & S.G.A. Jaeckel, 1931 - syn of: Limopsis chuni K.H.J. Thiele & S.G.A. Jaeckel, 1931 - (LIMOPSIDAE)
- agulhasensis, Lyonsiella agulhasensis (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (LYONSIELLIDAE)
- agulhasensis, Hydroginella agulhasensis (K.H.J. Thiele, 1925) - (MARGINELLIDAE)
- agulhasensis, Prunum agulhasensis K.H.J. Thiele, 1925 - syn of: Hydroginella agulhasensis (K.H.J. Thiele, 1925) - (MARGINELLIDAE)
- agulhasensis, Charitodoron agulhasensis (K.H.J. Thiele, 1925) - (MITRIDAE)
- agulhasensis, Afritrophon agulhasensis (K.H.J. Thiele, 1925) - (MURICIDAE)
- agulhasensis, Natica agulhasensis K.H.J. Thiele, 1925 - (NATICIDAE)
- agulhasensis, Retusa agulhasensis K.H.J. Thiele, 1925 - (RETUSIDAE)
- agulhasensis, Cingula agulhasensis K.H.J. Thiele, 1925 - (RISSOIDAE)
- agulhasensis, Caporbis agulhasensis (K.H.J. Thiele, 1925) - (SILIQUARIIDAE)
- agulhasensis, Ilanga agulhasensis (K.H.J. Thiele, 1925) - (SOLARIELLIDAE)
- agulhasensis, Thraciopsis agulhasensis K.H. Barnard, 1964 - (THRACIIDAE)
- agulhasensis, Thracidora agulhasensis (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (THRACIIDAE)
- agulhasensis, Vitrinella agulhasensis K.H.J. Thiele, 1925 - syn of: Parviturbo agulhaensis (K.H.J. Thiele, 1925) - (TORNIDAE)
- agulhasensis, Triphora agulhasensis K.H.J. Thiele, 1925 - syn of: Cerithiopsis agulhasensis (K.H.J. Thiele, 1925) - (TRIPHORIDAE)
- agulhasensis, Felaniella agulhasensis (S.G.A. Jaeckel & K.H.J. Thiele, 1931) - (UNGULINIDAE)
- agumbensis, Cremnoconchus agumbensis D.G. Reid, N.A. Aravind & N.A. Madhyastha, 2013 - (LITTORINIDAE)
- agustinensis, Cymbiola vespertilio agustinensis P. Bail & H. Douté, 1995 - (VOLUTIDAE)
- agustini, Eopteria agustini P. Sánchez, 2000 † - (EOPTERIIDAE) (FOSSIL)
- agustini, Cochlodinella agustini C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- agustini, Centralia concolor agustini C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- agustoscrobis, Venericor agustoscrobis (Gardner & E. Bowles, 1939 †) - (CARDITIDAE) (FOSSIL)
- agyris, Ptychonema agyris A.M. Popov & al., 2007 † - (EOTOMARIIDAE) (FOSSIL)
- aharoni, Archivesica aharoni S. Kiel & M. Taviani, 2017 † - (VESICOMYIDAE) (FOSSIL)
- aharonii, Sphincterochila aharonii (W. Kobelt, 1913) - (SPHINCTEROCHILIDAE)
- ahausense, Ancyloceras ahausense Simionescu, 1900 † - (ANCYLOCERATIDAE) (FOSSIL)
- ahaweraensis, Alcithoe ahaweraensis J. Marwick, 1926 † - (VOLUTIDAE) (FOSSIL)
- ahena, Paralaoma ahena T. Iredale, 1945 - (PUNCTIDAE)
- ahena, Gibbula ahena H.B. Preston, 1908 - (TROCHIDAE)
- ahenea, Elliptio ahenea I. Lea, 1843 - (UNIONIDAE)
- ahenum, Drepanotrema ahenum F.C. Baker, 1930 - (PLANORBIDAE)
- ahiparana, Opalia ahiparana (A.W.B. Powell, 1930) - (EPITONIIDAE)
- ahiparana, Pliciscala ahiparana A.W.B. Powell, 1930 - syn of: Opalia ahiparana (A.W.B. Powell, 1930) - (EPITONIIDAE)
- ahiparana, Uttleya ahiparana (A.W.B. Powell, 1927) - (MURICIDAE)
- ahiparana, Antimelatoma ahiparana A.W.B. Powell, 1942 - syn of: Antimelatoma buchanani (F.W. Hutton, 1873) - (PSEUDOMELATOMIDAE)
- ahiparanus, Stiracolpus ahiparanus (A.W.B. Powell, 1927) - (TURRITELLIDAE)
- ahiparanus, Zeacolpus ahiparanus A.W.B. Powell, 1927 - syn of: Stiracolpus ahiparanus (A.W.B. Powell, 1927) - (TURRITELLIDAE)
- ahitsitondronae, Sitala ahitsitondronae (F. Salvat, 1966) - (ARIOPHANTIDAE)
- ahjumawi, Fluminicola ahjumawi R. Hershler, H.P. Liu, T.J. Frest & E.J. Johannes, 2007 - (LITHOGLYPHIDAE)
- ahlburgi, Coelostylina ahlburgi Assmann, 1924 † - (COELOSTYLINIDAE) (FOSSIL)
- ahlstedti, Epioblasma ahlstedti J.W. Jones & R.J. Neves, 2010 - (UNIONIDAE)
- ahltenense, Eutrephoceras ahltenense (Schulter, 1876 †) - (NAUTILIDAE) (FOSSIL)
- ahmadi, Mathilda ahmadi Abbass, 1962 † - (MATHILDIDAE) (FOSSIL)
- ahmarina, Otala ahmarina (P.M. Pallary, 1920) - (HELICIDAE)
- ahmarina kesebiana, Otala ahmarina kesebiana (P.M. Pallary, 1920) - (HELICIDAE)
- ahmedi, Turris ahmedi Abbass, 1967 † - (TURRIDAE) (FOSSIL)
- ahmei, Xerosecta ahmei (P.M. Pallary, 1898) - (HYGROMIIDAE)
- ahngeri, Clessinia ahngeri C.A. Westerlund, 1902 - syn of: Turricaspia triton (K.E.I. von Eichwald, 1838) - (ODONTOSTOMIDAE)
- ahnni, Chaetopleura ahnni A. de Rochebrune, 1884 - syn of: Plaxiphora aurata (J.J.N.A. Spalowsky, 1795) - (CHAETOPLEURIDAE)
- ahoi, Neadmete ahoi M.G. Harasewych & R.E. Petit, 2011 - (CANCELLARIIDAE)
- Ahtioconcha, Genus Ahtioconcha Opik, 1930 † (PTERINEIDAE) (FOSSIL)
- ahuiri, Lindholmiella ahuiri J. Grego & M. Szekeres, 2011 - (CLAUSILIIDAE)
- ahuiri, Clavatula ahuiri T. Cossignani & R. Ardovini, 2014 - (CLAVATULIDAE)
- ahuiri, Atlasica ahuiri T. Cossignani, 2012 - (HELICIDAE)
- ahuiri, Mangelia ahuiri T. Cossignani & R. Ardovini, 2011 - (MANGELIIDAE)
- ahuiri, Melanopsis ahuiri J. Ahuir, 2014 - (MELANOPSIDAE)
- ahuiri, Coralliophila ahuiri T. Cossignani, 2009 - (MURICIDAE)
- aialensis, Ampezzanilda aialensis (Zardini, 1980 †) - (AMPEZZANILDIDAE) (FOSSIL)
- aialensis, Promathildia aialensis Zardini, 1980 † - syn of: Ampezzanilda aialensis (Zardini, 1980 †) - (GORDENELLIDAE) (FOSSIL)
- aichae, Hemicosmorthoceras aichae Kröger, 2008 † - (SPHAERORTHOCERATIDAE) (FOSSIL)
- aichalica, Yochelcionella aichalica Schabanov & al., 1987 † - (YOCHELCIONELLIDAE) (FOSSIL)
- aidae, Ischnochiton aidae G. Righi, 1973 - (ISCHNOCHITONIDAE)
- aidae, Granulina aidae J. Espinosa & J.A. Ortea, 2006 - (MARGINELLIDAE)
- Aidemofusus, Genus Aidemofusus A. Kosyan & Y.I. Kantor, 2013 (BUCCINIDAE)
- Aidituans, syn of: Subgenus Tornatellides (Aedituans) C.M. Cooke & Y. Kondo, 1960 (ACHATINELLIDAE)
- Aidone, syn of: Genus Mitrella A. Risso, 1826 (COLUMBELLIDAE)
- aiea, Amastra turritella aiea A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- aiens, Cyclonema aiens (Sardeson, 1896 †) - (PLATYCERATIDAE) (FOSSIL)
- aiens, Horiostomella aiens Sardeson, 1896 † - syn of: Cyclonema aiens (Sardeson, 1896 †) - (SINUOPEIDAE) (FOSSIL)
- aifamensis, Mourlonia aifamensis Dickins & Skwarko, 1981 † - (GOSSELETINIDAE) (FOSSIL)
- aignanensis, Pupinella aignanensis C. Hedley, 1891 - (PUPINIDAE)
- Aigoceras, Genus Aigoceras Zhuravleva, 1972 † (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- aikawai, Nuculana aikawai T. Habe, 1958 - (NUCULANIDAE)
- aikeni, Belomitra aikeni (M. Lussi, 2011) - (BELOMITRIDAE)
- aikeni, Filodrillia aikeni P. Stahlschmidt, 2015 - (BORSONIIDAE)
- aikeni, Calliostoma aikeni M. Lussi, 2014 - (CALLIOSTOMATIDAE)
- aikeni, Sulcomitrella aikeni (M. Lussi, 2009) - (COLUMBELLIDAE)
- aikeni, Austromitra aikeni M. Lussi, 2015 - (COSTELLARIIDAE)
- aikeni, Pseudolatirus aikeni M. Lussi, 2014 † - (FASCIOLARIIDAE) (FOSSIL)
- aikeni, Marginella aikeni S.G. Veldsman & S.G. Veldsman, 2012 - (MARGINELLIDAE)
- aikeni, Alaginella aikeni M. Lussi, 2013 - (MARGINELLIDAE)
- aikeni, Mitra aikeni M. Lussi, 2009 - (MITRIDAE)
- aikeni, Murexsul aikeni M. Lussi, 2010 - (MURICIDAE)
- aikeni, Bullia aikeni R.N. Kilburn, 1978 - (NASSARIIDAE)
- aikeni, Callipara aikeni S.G. Veldsman, 2012 - (VOLUTIDAE)
- aikeni, Fusivoluta aikeni M. Lussi, 2011 - syn of: Belomitra aikeni (M. Lussi, 2011) - (VOLUTIDAE)
- aikeni inhacaensis, Callipara aikeni inhacaensis S.G. Veldsman, 2012 - (VOLUTIDAE)
- aikeni kosibayensis, Callipara aikeni kosibayensis S.G. Veldsman, 2012 - (VOLUTIDAE)
- aila, Chromodoris aila Er. Marcus, 1961 - (CHROMODORIDIDAE)
- ailaketoae, Hedleyoconcha ailaketoae J. Stanisic, 1990 - (CHAROPIDAE)
- aileenae, Bostryx aileenae A.S.H. Breure, 1978 - (BULIMULIDAE)
- aileenae, Melayonchis aileenae Dayrat & Goulding, 2017 - (ONCHIDIIDAE)
- ailhaudi, Turbonilla ailhaudi (E. Saurin, 1959) - (PYRAMIDELLIDAE)
- ailinana, Rissoina ailinana H.S. Ladd, 1966 † - (RISSOINIDAE) (FOSSIL)
- Ailinzebina, Genus Ailinzebina H.S. Ladd, 1966 (RISSOINIDAE)
- aillana, Cypraedia aillana J.M. Pacaud & Ledon, 2012 † - (OVULIDAE) (FOSSIL)
- aillaudorum, Alcithoe aillaudorum P. Bouchet & G.T. Poppe, 1988 - (VOLUTIDAE)
- Aillya, Genus Aillya N.H. Odhner, 1927 (AILLYIDAE)
- aillyi, Zonitotrochus aillyi (H.A. Pilsbry, 1919) - (UROCYCLIDAE)
- AILLYIDAE H. B. Baker, 1955 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-AILLYOIDEA [Superfamily])
- aimei, Natica aimei F.P. Jousseaume, 1884 - syn of: Natica bouvieri F.P. Jousseaume, 1883 - (NATICIDAE)
- aimen, Cerithiopsis aimen E. Rolán & J. Espinosa, 1996 - (CERITHIOPSIDAE)
- Aimitus, Genus Aimitus † (HYOLITHIDA (UNASSIGNED)) (FOSSIL)
- ainamurensis, Hipponix ainamurensis Abbass, 1967 † - (HIPPONICIDAE) (FOSSIL)
- Ainicardita, Genus Ainicardita Popov, 1983 † (CARDITIDAE) (FOSSIL)
- ainikta, Anchura ainikta Elder & Saul, 1996 † - (APORRHAIDAE) (FOSSIL)
- ainiktos, Bullamirifica ainiktos (Dailey & W.P. Popenoe, 1966 †) - (CAENOGASTROPODA (UNASSIGNED)) (FOSSIL)
- ainiktos, Pseudoglauconia ainiktos Dailey & W.P. Popenoe, 1966 † - syn of: Bullamirifica ainiktos (Dailey & W.P. Popenoe, 1966 †) - (CASSIOPIDAE) (FOSSIL)
- aino, Neptunea polycostata aino K. Fraussen & Y. Terryn, 2007 - (BUCCINIDAE)
- Ainoceras, Subgenus Jouaniceras (Ainoceras) Matsumoto in Matsumoto & Kaine, 1967 † (NOSTOCERATIDAE) (FOSSIL)
- Ainohelix, Subgenus Bradybaena (Ainohelix) J.T. Kuroda & Is. Taki, 1933 (BRADYBAENIDAE)
- ainos, Volutharpa ainos J.T. Kuroda & T. Kinoshita, 1956 - (BUCCINIDAE)
- ainsworthi, Eatoniella ainsworthi (C. Hedley, 1916) - (EATONIELLIDAE)
- ainsworthi, Onoba ainsworthi C. Hedley, 1916 - (RISSOIDAE)
- ainuana, Yeharella ainuana (Yabe & Nagao, 1928) † - (STEINMANELLIDAE) (FOSSIL)
- ainuanum, Ciliatocardium ainuanum (Yokoyama, 1927 †) - (CARDIIDAE) (FOSSIL)
- aioca, Bathydoris aioca Er. Marcus & Ev. Marcus, 1962 - (BATHYDORIDIDAE)
- Aioloceras, Genus Aioloceras Whitehouse , 1926 † (DESMOCERATIDAE) (FOSSIL)
- aipeia, Jupiteria aipeia W.P. Woodring, 1973 † - (NUCULANIDAE) (FOSSIL)
- Aipetoceras, Genus Aipetoceras Zhuravleva, 1972 † (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- Aipoceras, Genus Aipoceras Hyatt, 1883 † (AIPOCERATIDAE) (FOSSIL)
- AIPOCERATIDAE Hyatt, 1883 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-NAUTILIDA [Order]-AIPOCERATOIDEA [Superfamily]) (FOSSIL)
- Aiptospira, syn of: Genus Patellilabia Knight, 1945 † (KNIGHTITIDAE) (FOSSIL)
- airaghii, Serpianites airaghii Rieber, 1973 † - (CERATITIDA (UNASSIGNED)) (FOSSIL)
- aista, Ruedemannia aista E.F.R.K. Koken, 1896 † - syn of: Ruedemannia lirata (Ulrich & Scofield, 1897 †) - (LOPHOSPIRIDAE) (FOSSIL)
- aitai, Hydrobia aitai E. Jekelius, 1932 † - (HYDROBIIDAE) (FOSSIL)
- aitaiensis, Viviparus aitaiensis E. Jekelius, 1932 † - (VIVIPARIDAE) (FOSSIL)
- aitanga, Mioawateria aitanga J. Grant-Mackie & M. Chapman-Smith, 1971 † - (RAPHITOMIDAE) (FOSSIL)
- aitanicus, Josefus aitanicus B. Arconada & M.A. Ramos, 2006 - (HYDROBIIDAE)
- aiteneria, Eopteria aiteneria A.M. Popov & al., 2004 † - (EOPTERIIDAE) (FOSSIL)
- Aiteng, Genus Aiteng C.K. Swennen & Buatip, 2009 (AITENGIDAE)
- AITENGIDAE Swennen & Buatip, 2009 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-ACOCHLIDIACEA [Order]-PARHEDYLOIDEA [Superfamily])
- aitha, Pseudocymia aitha W.P. Popenoe & Saul, 1987 † - (PERISSITYIDAE) (FOSSIL)
- aithaliae, Columbites aithaliae Renz & Renz, 1948 † - syn of: Subcolumbites dusmani (Arthaber, 1911 †) - (COLUMBITIDAE) (FOSSIL)
- aithorrhis, Spergo aithorrhis A.V. Sysoev & P. Bouchet, 2001 - (RAPHITOMIDAE)
- aito, Conus aito M. Rabiller & G. Richard, 2014 - (CONIDAE)
- aitormonzoi, Anticlimax aitormonzoi F. Rubio & E. Rolán, 2014 - (TORNIDAE)
- aitus, Triplex aitus (A. De Gregorio, 1885 †) - (MURICIDAE) (FOSSIL)
- aivica, Taringa aivica Er. Marcus & Ev. Marcus, 1967 - (DISCODORIDIDAE)
- aivica timia, Taringa aivica timia Er. Marcus & Ev. Marcus, 1967 - (DISCODORIDIDAE)
- aiyengari, Myurella aiyengari A. Dey, 1961 † - (TEREBRIDAE) (FOSSIL)
- aizoi, Mimarcaria aizoi (K. Sakurai, 1969) - (ARCIDAE)
- Aizyella, Subgenus Tricolia (Aizyella) A.E.M. Cossmann, 1889 (PHASIANELLIDAE)
- aizyense, Epitonium aizyense G.P. Deshayes, 1861 † - (EPITONIIDAE) (FOSSIL)
- aizyensis, Acteon aizyensis G.P. Deshayes, 1862 † - (ACTEONIDAE) (FOSSIL)
- aizyensis, Ampullina aizyensis (J.F. Bayan, 1870 †) - (AMPULLINIDAE) (FOSSIL)
- aizyensis, Arcturellina sulcata aizyensis (G.P. Deshayes, 1858 †) - (CARDITIDAE) (FOSSIL)
- aizyensis, Musculus aizyensis A.E.M. Cossmann, 1886 † - (MYTILIDAE) (FOSSIL)
- aizyensis, Berriasella aizyensis Mazenot, 1939 † - syn of: Lopeziceras chaperi (Pictet, 1868 †) - (NEOCOMITIDAE) (FOSSIL)
- aizyensis, Aviculoperna aizyensis (G.P. Deshayes, 1858 †) - (PTERIIDAE) (FOSSIL)
- ajanensis, Paludomus ajanensis P.M.A. Morelet, 1860 - (PALUDOMIDAE)
- ajanica, Oxyloma ajanica I.M. Likharev & A.A. Schileyko, 1986 - (SUCCINEIDAE)
- Ajanssenium, Subgenus Lentidium (Ajanssenium) Kadolsky, 1989 † (CORBULIDAE) (FOSSIL)
- ajar, Cardiocardita ajar (J.G. Bruguière, 1792) - (CARDITIDAE)
- ajax, Audouliceras ajax (F.M. Anderson, 1938 †) - (ANCYLOCERATIDAE) (FOSSIL)
- ajax, Euaspidoceras ajax (H.A. Leanza, 1947 †) - (ASPIDOCERATIDAE) (FOSSIL)
- ajax, Strophiops ajax C.J. Maynard, 1924 - (CERIONIDAE)
- ajax, Erymnoceras ajax A.V.M.D. D'Orbigny, 1850 † - (PACHYCERATIDAE) (FOSSIL)
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