- authelini, Osperleioceras authelini (Monestier, 1921 †) - (HILDOCERATIDAE) (FOSSIL)
- autinae, Pseudomoutoniceras autinae J.J. Vermeulen, 2007 † - (CRIOCERATITIDAE) (FOSSIL)
- autissiodorensis, Quadrinervus autissiodorensis (Cotteau, 1854 †) - (APORRHAIDAE) (FOSSIL)
- autissiodorensis, Aulacostephanoceras autissiodorensis Cotteau, 1868 † - (AULACOSTEPHANIDAE) (FOSSIL)
- autissiodorensis, Mytilus autissiodorensis Cotteau, 1853 † - (MYTILIDAE) (FOSSIL)
- autissiodorensis, Rostellaria autissiodorensis Cotteau, 1854 † - (ROSTELLARIIDAE) (FOSSIL)
- Autochiton, syn of: Genus Ischnochiton J.E. Gray, 1847 (ISCHNOCHITONIDAE)
- Autocoptis, Genus Autocoptis H.A. Pilsbry, 1902 (UROCOPTIDAE)
- autolycus, Rudolfoceras autolycus (Billings, 1862 †) - (RUDOLFOCERATIDAE) (FOSSIL)
- Autonoella, syn of: Genus Auriculodes E. Strand, 1928 (ELLOBIIDAE)
- Autralium, syn of: Genus Astralium J.H.F. Link, 1807 (TURBINIDAE)
- autrani, Pseudoshasticrioceras autrani Delanoy, 1999 † - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- autumnalis, Ampullaria autumnalis L.A. Reeve, 1856 - syn of: Pomacea sordida (W.J. Swainson, 1823) - (AMPULLARIIDAE)
- autumnalis, Muracypraea autumnalis G. Perry, 1811 - syn of: Muracypraea mus (C. Linnaeus, 1758) - (CYPRAEIDAE)
- autumnalis, Trochulus autumnalis J.R. Bourguignat - syn of: Trichia plebeia (J.P.R. Draparnaud, 1805) - (HYGROMIIDAE)
- autumnalis, Mitra autumnalis W.L.H. Dohrn, 1860 - syn of: Vexillum acupictum (L.A. Reeve, 1845) - (MITRIDAE)
- autumnus, Joculator autumnus Cecalupo & Perugia, 2016 - (CERITHIOPSIDAE)
- auturica, Monacha auturica G. Falkner, 2000 - (HYGROMIIDAE)
- auversiensis, Barbatia auversiensis G.P. Deshayes, 1858 † - (ARCIDAE) (FOSSIL)
- auversiensis, Pythiopsis auversiensis A.E.M. Cossmann, 1889 † - (ELLOBIIDAE) (FOSSIL)
- auversiensis, Acirsa auversiensis G.P. Deshayes, 1861 † - (EPITONIIDAE) (FOSSIL)
- auversiensis, Emarginula auversiensis G.P. Deshayes, 1861 † - (FISSURELLIDAE) (FOSSIL)
- auversiensis, Jsowerbya auversiensis (G.P. Deshayes, 1865 †) - (MURICIDAE) (FOSSIL)
- auversiensis, Keepingia auversiensis (G.P. Deshayes, 1865 †) - (NASSARIIDAE) (FOSSIL)
- auversiensis, Diplodonta auversiensis G.P. Deshayes, 1857 † - (UNGULINIDAE) (FOSSIL)
- auvertianum, Campanile auvertianum (Orbigny, 1850 †) - (CAMPANILIDAE) (FOSSIL)
- auwahiensis, Amastra subsoror auwahiensis H.A. Pilsbry & C.M. Cooke, 1914 - (AMASTRIDAE)
- auzendei, Thermosipho auzendei (A. Warén & P. Bouchet, 2001) - (BUCCINIDAE)
- auzendei, Enigmaticolus auzendei (A. Warén & P. Bouchet, 2001) - syn of: Thermosipho auzendei (A. Warén & P. Bouchet, 2001) - (BUCCINIDAE)
- ava, Pyramidella ava P. Bartsch, 1926 - (PYRAMIDELLIDAE)
- ava, Aylacostoma ava H.A. Pilsbry & A.A. Olsson, 1935 † - (THIARIDAE) (FOSSIL)
- ava, Pseudodon ava W. Theobald, 1873 - syn of: Pseudodon avae (W. Theobald, 1873) - (UNIONIDAE)
- avachensis, Margarites avachensis Y.I. Galkin, 1955 ex P. Bartsch MS - (MARGARITIDAE)
- avae, Pseudodon avae (W. Theobald, 1873) - (UNIONIDAE)
- avaense, Diaphoroceras avaense Ulrich & al., 1944 † - (BASSLEROCERATIDAE) (FOSSIL)
- avaense, Stylocyrtoceras avaense Ulrich & al., 1944 † - (BASSLEROCERATIDAE) (FOSSIL)
- avaensis, Lithoconus odengensis avaensis Noetling, 1901 † - (CONIDAE) (FOSSIL)
- Avakubia, Subgenus Gulella (Avakubia) H.A. Pilsbry, 1919 (STREPTAXIDAE)
- avakubiensis, Gyraulus avakubiensis (H.A. Pilsbry & J.C. Bequaert, 1927) - (PLANORBIDAE)
- avakubiensis, Avakubia avakubiensis H.A. Pilsbry, 1919 - (STREPTAXIDAE)
- avakubiensis, Subulina avakubiensis H.A. Pilsbry, 1919 - (SUBULINIDAE)
- Avalanchia, Genus Avalanchia Caldwell & Chatterton, 1995 † (PSEUDOBIGALEAIDAE) (FOSSIL)
- avalitensis, Bistolida avalitensis F.P. Jousseaume, 1894 - syn of: Bistolida erythraeensis (G.B. II Sowerby, 1837) - (CYPRAEIDAE)
- avalites, Epitonium avalites (F.P. Jousseaume, 1912) - (EPITONIIDAE)
- avaloensis, Napaeus avaloensis K. Groh, 2006 - (ENIDAE)
- avalonense, Radiocentrum avalonense (H. Hemphill in H.A. Pilsbry, 1905) - (OREOHELICIDAE)
- avalonensis, Latouchella avalonensis Landing & al., 1989 † - (COREOSPIRIDAE) (FOSSIL)
- avalonensis, Boreotrophon avalonensis W.H. Dall, 1902 - (MURICIDAE)
- avalonensis, Oreohelix avalonensis H. Hemphill in H.A. Pilsbry, 1905 - syn of: Radiocentrum avalonense (H. Hemphill in H.A. Pilsbry, 1905) - (OREOHELICIDAE)
- avalvis, Chlamydoconcha avalvis L.R.L. Simone, 2008 - (GALEOMMATIDAE)
- avanaensis, Sinployea avanaensis G.A. Solem, 1983 - (CHAROPIDAE)
- avanalamerae, Kalidos avanalamerae K.C. Emberton, 2007 - (ARIOPHANTIDAE)
- avanica, Gastrocopta avanica (W.H. Benson, 1863) - (GASTROCOPTIDAE)
- avanum, Sphaerium avanum W. Theobald, 1873 - (SPHAERIIDAE)
- Avaoceras, Genus Avaoceras Ulrich & al., 1944 † (BASSLEROCERATIDAE) (FOSSIL)
- avara, Admete avara T. Say, 1822 - syn of: Costoanachis avara (T. Say, 1822) - (CANCELLARIIDAE)
- avara, Costoanachis avara (T. Say, 1822) - (COLUMBELLIDAE)
- avara, Columbella avara R.W. Dunker, 1875 - syn of: Costoanachis sertulariarum (A.V.M.D. D'Orbigny, 1839) - (COLUMBELLIDAE)
- avara, Daedalochila avara (T. Say, 1818) - (POLYGYRIDAE)
- avara, Catinella avara T. Say - (SUCCINEIDAE)
- Avardaria, Genus Avardaria Ali-Zade, 1932 † (RISSOOIDEA (UNASSIGNED)) (FOSSIL)
- avaricatum, Cheiloceras avaricatum Sobolew, 1914 † - (CHEILOCERATIDAE) (FOSSIL)
- avaricatum, Tornoceras avaricatum Sobolew, 1914 † - syn of: Protornoceras planilobum Sobolew, 1914 † - (TORNOCERATIDAE) (FOSSIL)
- avaricosa, Parastrophia avaricosa A. Vannozzi, M. Pizzini & B.K. Raines, 2015 - (CAECIDAE)
- avarix, Hydrobioides avarix T.N. Annandale, 1918 - (BITHYNIIDAE)
- avaroides, Anachis avaroides F. Nordsieck, 1975 - (COLUMBELLIDAE)
- Avarua, Subgenus Lamprocystis (Avarua) F.C. Baker, 1940 (EUCONULIDAE)
- avarus, Gonionotites avarus Tozer, 1994 † - (JUVAVITIDAE) (FOSSIL)
- avarus, Coelotrochus avarus (H.H. Suter, 1917 †) - (TROCHIDAE) (FOSSIL)
- avatea, Favartia avatea (R. Houart & J. Tröndlé, 2008) - (MURICIDAE)
- avatea, Pygmaepterys avatea R. Houart & J. Tröndlé, 2008 - syn of: Favartia avatea (R. Houart & J. Tröndlé, 2008) - (MURICIDAE)
- avawatzica, Sonorelix avawatzica (S.S. Berry, 1930) - (HELMINTHOGLYPTIDAE)
- avecenninae, Segmentina avecenninae Z.I. Izzatullaev, 1980 - (PLANORBIDAE)
- avecta, Heteroglypta avecta T. Iredale, 1929 - syn of: Heteroglypta contraria (G.P. Deshayes in L. Maillard, 1863) - (PSAMMOBIIDAE)
- avelinii, Michelinoceras avelinii (Salter, 1854 †) - (MICHELINOCERATIDAE) (FOSSIL)
- avelinii, Orthoceras avelinii Salter, 1854 † - syn of: Michelinoceras avelinii (Salter, 1854 †) - (ORTHOCERATIDAE) (FOSSIL)
- avellana, Amphibola avellana J.G. Bruguière, 1789 - syn of: Amphibola crenata (J.F. Gmelin, 1791) - (AMPHIBOLIDAE)
- avellana, Pomacea avellana (G.B. III Sowerby, 1909) - (AMPULLARIIDAE)
- avellana, Arca avellana J.B.P.A. Lamarck, 1819 - syn of: Arca patriarchalis P.F. Röding, 1798 - (ARCIDAE)
- avellana, Tylopoma avellana (M. von Neumayr, 1869 †) - (BITHYNIIDAE) (FOSSIL)
- avellana, Buccinum avellana L.A. Reeve, 1846 - syn of: Cronia avellana (L.A. Reeve, 1846) - (BUCCINIDAE)
- avellana, Naesiotus avellana (H.H. Beck, 1837) - (BULIMULIDAE)
- avellana, Bulimus avellana J.G. Bruguière, 1789 - syn of: Amphibola crenata (J.F. Gmelin, 1791) - (BULIMULIDAE)
- avellana, Cassis avellana A. Brongniart, 1822 † - syn of: Avellana avellana (A. Brongniart, 1822 †) - (CASSIDAE) (FOSSIL)
- avellana, Conus avellana Lamarck, 1810 † - (CONIDAE) (FOSSIL)
- avellana, Cypraea avellana G.B. I Sowerby, 1823 † - syn of: Niveria avellana (G.B. I Sowerby, 1823 †) - (CYPRAEIDAE) (FOSSIL)
- avellana, Persicula persicula avellana (J.B.P.A. Lamarck, 1822) - (CYSTISCIDAE)
- avellana, Melanopsis avellana C.L.F. von Sandberger, 1870 † - (MELANOPSIDAE) (FOSSIL)
- avellana, Cronia avellana (L.A. Reeve, 1846) - (MURICIDAE)
- avellana, Amauropsis avellana F.A. Roemer, 1888 † - syn of: Tylostoma elevatum (Shumard, 1861 †) - (NATICIDAE) (FOSSIL)
- avellana, Neritina avellana C.A. Récluz, 1842 - syn of: Clithon faba (G.B. I Sowerby, 1836) - (NERITIDAE)
- avellana, Oliva avellana J.B.P.A. Lamarck, 1811 - (OLIVIDAE)
- avellana, Odostomia avellana P.P. Carpenter, 1864 - (PYRAMIDELLIDAE)
- Avellana, Genus Avellana D'Orbigny, 1842 † (RINGICULIDAE) (FOSSIL)
- avellana, Avellana avellana (A. Brongniart, 1822 †) - (RINGICULIDAE) (FOSSIL)
- avellana, Pseudoilbia avellana (R.L. Schmekel & D. Cappellato, 2001) - (RUNCINIDAE)
- avellana, Niveria avellana (G.B. I Sowerby, 1823 †) - (TRIVIIDAE) (FOSSIL)
- avellana turbatrix, Arca avellana turbatrix P.G. Oliver & R. von Cosel, 1993 - syn of: Arca turbatrix P.G. Oliver & R. von Cosel, 1993 - (ARCIDAE)
- avellanaria, Bentharca avellanaria (J.C. Melvill & R. Standen, 1907) - (ARCIDAE)
- avellanedae, Cyclodontina avellanedae (A. Doering, 1881) - (ODONTOSTOMIDAE)
- avellanoides, Soleniscus avellanoides (de Koninck, 1863 †) - (SOLENISCIDAE) (FOSSIL)
- avellanoides, Macrocheilus avellanoides de Koninck, 1863 † - syn of: Soleniscus avellanoides (de Koninck, 1863 †) - (SOLENISCIDAE) (FOSSIL)
- avellanoides, Sphaerodoma avellanoides Keyes 1889 † - (SPHAERODOMIDAE) (FOSSIL)
- avellanoides, Trivia avellanoides McCoy, 1867 - syn of: Ellatrivia caelatura (C. Hedley, 1918) - (TRIVIIDAE)
- avellanula, Niveria avellanula (F. Sacco, 1894) - (TRIVIIDAE)
- avellanum, Pleurobema avellanum C.T. Simpson, 1900 - syn of: Pleurobema rubellum T.A. Conrad, 1834 - (UNIONIDAE)
- avellanus, Helix punctulatus avellanus R.T. Lowe, 1854 - (HELICIDAE)
- avellanus, Caseolus punctulatus avellanus (R.T. Lowe, 1855) - (HYGROMIIDAE)
- avempacensis, Alexandromenia avempacensis L. Pedrouzo & M.C. Cobo, 2014 - (AMPHIMENIIDAE)
- avena, Chondrina avena J.P.R. Draparnaud, 1805 - syn of: Chondrina avenacea (J.G. Bruguière, 1792) - (CHONDRINIDAE)
- avena, Mitrella avena (L.A. Reeve, 1859) - (COLUMBELLIDAE)
- avena, Cylindrobullina avena (Terquem, 1855 †) - (CYLINDROBULLINIDAE) (FOSSIL)
- avena, Pseudobelus avena Dumortier, 1925 † - syn of: Rhabdobelus avena Dumortier, 1866 † - (DUVALIIDAE) (FOSSIL)
- avena, Rhabdobelus avena Dumortier, 1866 † - (HASTITIDAE) (FOSSIL)
- avena, Volvarina avena (L.C. Kiener, 1834) - (MARGINELLIDAE)
- avena, Marginella avena L.C. Kiener, 1834 - syn of: Volvarina avena (L.C. Kiener, 1834) - (MARGINELLIDAE)
- avena, Simnia avena (G.B. II Sowerby, 1832) - (OVULIDAE)
- avena, Ovula avena G.B. II Sowerby, 1832 - syn of: Simnia avena (G.B. II Sowerby, 1832) - (OVULIDAE)
- avena, Parachondria avena (C.B. Adams, 1849) - (POMATIIDAE)
- avena, Pseudotritonium avena (Laube 1868 †) - (PSEUDOTRITONIIDAE) (FOSSIL)
- avena, Striactaeonina avena Terquem, 1855 † - syn of: Cylindrobullina avena (Terquem, 1855 †) - (TUBIFERIDAE) (FOSSIL)
- avena beyerleana, Volvarina avena beyerleana (M. Bernardi, 1883) - (MARGINELLIDAE)
- avena fraterminor, Parachondria avena fraterminor H.A. Pilsbry & A.P. Brown, 1910 - (POMATIIDAE)
- avena ruthturnerae, Simnia avena ruthturnerae C.N. Cate, 1973 - (OVULIDAE)
- avena southwicki, Volvarina avena southwicki C.A. Davis, 1904 - syn of: Volvarina southwicki (C.A. Davis, 1904) - (MARGINELLIDAE)
- avena varia, Volvarina avena varia G.B. II Sowerby, 1846 - (MARGINELLIDAE)
- avenacea, Buccinum avenacea R.P. Lesson, 1842 - syn of: Cronia avenacea (R.P. Lesson, 1842) - (BUCCINIDAE)
- avenacea, Chondrina avenacea (J.G. Bruguière, 1792) - (CHONDRINIDAE)
- avenacea, Prunum avenacea G.P. Deshayes, 1844 - syn of: Prunum bellulum (W.H. Dall, 1890) - (MARGINELLIDAE)
- avenacea, Nebularia avenacea L.A. Reeve, 1845 - (MITRIDAE)
- avenacea, Cronia avenacea (R.P. Lesson, 1842) - (MURICIDAE)
- avenacea, Truncatella avenacea A. Garrett, 1887 - (TRUNCATELLIDAE)
- avenacea istriana, Chondrina avenacea istriana P. Ehrmann, 1931 - (CHONDRINIDAE)
- avenacea latilabris, Chondrina avenacea latilabris A. Stossich, 1895 - (CHONDRINIDAE)
- avenacea lepta, Chondrina avenacea lepta C.A. Westerlund, 1887 - (CHONDRINIDAE)
- avenacea lessinica, Chondrina avenacea lessinica (G.B. Adami, 1885) - (CHONDRINIDAE)
- avenacea paucidens, Pupilla avenacea paucidens C.A. Westerlund, 1887 - syn of: Chondrina clienta (C.A. Westerlund, 1883) - (PUPILLIDAE)
- avenacea veneta, Chondrina avenacea veneta H. Nordsieck, 1962 - (CHONDRINIDAE)
- Avenaceana, syn of: Genus Chondrina Reichenbach, 1828 (CHONDRINIDAE)
- avenaria, Acteocina avenaria (R.B. Watson, 1886) - (ACTEOCINIDAE)
- avenatus, Siphonochelus avenatus R.B. Hinds, 1844 - syn of: Siphonochelus arcuatus (R.B. Hinds, 1843) - (MURICIDAE)
- avenella, Volvarina avenella (W.H. Dall, 1881) - (MARGINELLIDAE)
- avenella, Prunum avenella W.H. Dall, 1881 - syn of: Volvarina avenella (W.H. Dall, 1881) - (MARGINELLIDAE)
- aveniculum, Chondrina aveniculum S. Clessin, 1887 - syn of: Chondrina avenacea (J.G. Bruguière, 1792) - (CHONDRINIDAE)
- aveniformis, Dentimargo aveniformis (P. Marshall, 1919 †) - (MARGINELLIDAE) (FOSSIL)
- avenionensis, Cernuella avenionensis J.R. Bourguignat in É.A.A. Locard, 1885 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- Avenionia, Genus Avenionia J.L. Nicolas, 1882 (HYDROBIIDAE)
- avenoides, Chondrina megacheilos avenoides C.A. Westerlund, 1874 - (CHONDRINIDAE)
- avenoides, Cylindrobullina avenoides F. Haas, 1953 † - (CYLINDROBULLINIDAE) (FOSSIL)
- avenosooki, Margarites avenosooki G.E. MacGinitie, 1959 - (MARGARITIDAE)
- avensis, Eurystomites avensis Ulrich & al., 1942 † - (TARPHYCERATIDAE) (FOSSIL)
- Averellia, Genus Averellia C.M.F. Ancey, 1887 (XANTHONYCHIDAE)
- averilli, Pachydiscus averilli Anderson, 1958 † - (DESMOCERATIDAE) (FOSSIL)
- averilli, Volutoderma averilli (W.M. Gabb, 1864 †) - (VOLUTODERMATIDAE) (FOSSIL)
- averina, Pseudorhaphitoma averina (J.C. Melvill & R. Standen, 1901) - (MANGELIIDAE)
- Averna, syn of: Genus Firoloida C.A. Lesueur, 1817 (PTEROTRACHEIDAE)
- avernalis, Pyrgulopsis avernalis (H.A. Pilsbry, 1935) - (HYDROBIIDAE)
- avernalis, Fluminicola avernalis H.A. Pilsbry, 1935 - syn of: Pyrgulopsis avernalis (H.A. Pilsbry, 1935) - (LITHOGLYPHIDAE)
- averni, Ardeadoris averni (W.B. Rudman, 1985) - (CHROMODORIDIDAE)
- averni, Beddomeia averni W.F. Ponder & K.B. Clark, 1993 - (HYDROBIIDAE)
- averni, Haurakia averni (W.F. Ponder & H.W. Worsfold, 1994) - (RISSOIDAE)
- averni, Pusillina averni W.F. Ponder & H.W. Worsfold, 1994 - syn of: Haurakia averni (W.F. Ponder & H.W. Worsfold, 1994) - (RISSOIDAE)
- avernus, Trochus avernus F. Stoliczka, 1861 † - (TROCHIDAE) (FOSSIL)
- aversa, Glyptoactis aversa (H.A. Pilsbry & Johnson, 1917 †) - (CARDITIDAE) (FOSSIL)
- aversa, Pandora aversa (C. Hedley, 1913) - (PANDORIDAE)
- aversum, Sinumelon aversum T. Iredale, 1937 - (CAMAENIDAE)
- averyi, Unio averyi I. Lea, 1859 - syn of: Barynaias caldwellii (I. Lea, 1858) - (UNIONIDAE)
- avesensis, Volvarina avesensis G.M. Caballer, J. Espinosa & J.A. Ortea, 2013 - (MARGINELLIDAE)
- aveyronensis, Cernuella aveyronensis É.A.A. Locard, 1894 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- Aveyroniceras, syn of: Genus Reynesoceras Spath , 1936 † (DACTYLIOCERATIDAE) (FOSSIL)
- avia, Albinaria avia (J.G.F. de Charpentier, 1852) - (CLAUSILIIDAE)
- Avia, Genus Avia Vialov, 1936 † (GRYPHAEIDAE) (FOSSIL)
- avia, Gonimyrtea avia E.A. Glover & D.W. Taylor, 2007 - (LUCINIDAE)
- avia, Vladanella avia Horný, 1992 † - (MURCHISONIIDAE) (FOSSIL)
- avia, Valvata avia (K.E.I. von Eichwald, 1853 †) - (VALVATIDAE) (FOSSIL)
- avia, Periglypta avia (G.P. Deshayes, 1857 †) - (VENERIDAE) (FOSSIL)
- aviaguensis, Eucrassatella aviaguensis F. Hodson, 1927 † - (CRASSATELLIDAE) (FOSSIL)
- aviaria, Strophiops aviaria C.J. Maynard & W.F. Clapp, 1921 - syn of: Cerion glans H.C. Küster, 1844 - (CERIONIDAE)
- aviarius, Musculus aviarius W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - (MYTILIDAE)
- aviasi, Dicoelites aviasi Challinor & J. Grant-Mackie, 1989 † - (DICOELITIDAE) (FOSSIL)
- Aviassiminea, Genus Aviassiminea H. Fukuda & W.F. Ponder, 2003 (ASSIMINEIDAE)
- Avicardium, Genus Avicardium Kolesnikov, 1950 † (BIVALVIA INCERTAE SEDIS) (FOSSIL)
- avicennia, Zafra avicennia C. Hedley, 1914 - syn of: Zafra pumila (R.W. Dunker, 1858) - (COLUMBELLIDAE)
- Avichlamys, Genus Avichlamys Allasinaz, 1972 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- avicula, Acanthochitona avicula (P.P. Carpenter, 1857) - (ACANTHOCHITONIDAE)
- Avicula, Genus Avicula Bruguière, 1791 † (PTERIIDAE) (FOSSIL)
- avicula, Pteria avicula H.S. Holten, 1802 - (PTERIIDAE)
- Avicula, syn of: Genus Pteria J.A. Scopoli, 1777 (PTERIIDAE)
- avicula chinensis, Pteria avicula chinensis W.E. Leach, 1814 - (PTERIIDAE)
- avicula iridescens, Pteria avicula iridescens L.A. Reeve, 1857 - (PTERIIDAE)
- aviculaeformis, Anadara aviculaeformis P. Nyst, 1848 - syn of: Anadara formosa (G.B. I Sowerby, 1833) - (ARCIDAE)
- aviculaeformis, Arca aviculaeformis P. Nyst, 1848 - syn of: Anadara formosa (G.B. I Sowerby, 1833) - (ARCIDAE)
- aviculaeformis, Leiopteria aviculaeformis Stuckenberg, 1898 † - (PTERINEIDAE) (FOSSIL)
- aviculaeformis, Prisodontopsis aviculaeformis F.R. Woodward, 1991 - (UNIONIDAE)
- avicular, Mytilus avicular H.S. Holten, 1802 - syn of: Pteria avicula H.S. Holten, 1802 - (MYTILIDAE)
- avicular, Pteria avicular H.S. Holten, 1802 - syn of: Pteria avicula H.S. Holten, 1802 - (PTERIIDAE)
- Avicularca, Genus Avicularca Bubnoff, 1921 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- aviculare, Isognomon aviculare J.B.P.A. Lamarck, 1819 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (PTERIIDAE)
- avicularis, Gryphaea avicularis Münster, 1841 † - (GRYPHAEIDAE) (FOSSIL)
- avicularis, Hyria avicularis J.B.P.A. Lamarck, 1819 - syn of: Prisodon syrmatophorus (J.F. Gmelin, 1791) - (HYRIIDAE)
- avicularis, Lyonsia avicularis J.D. Kurtz, 1860 - (LYONSIIDAE)
- avicularis, Perna avicularis J.B.P.A. Lamarck, 1819 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (MYTILIDAE)
- avicularis, Ostrea avicularis Klipstein, 1843 † - syn of: Cassianella gryphaeata (Münster, 1841 †) - (OSTREIDAE) (FOSSIL)
- avicularis, Isognomon avicularis J.B.P.A. Lamarck, 1819 - syn of: Isognomon isognomum (C. Linnaeus, 1758) - (PTERIIDAE)
- avicularis, Crenatula avicularis J.B.P.A. Lamarck, 1803 - syn of: Crenatula picta (J.F. Gmelin, 1791) - (PTERIIDAE)
- avicularis, Crenatula avicularis F. Stoliczka, 1871 - syn of: Crenatula picta (J.F. Gmelin, 1791) - (PTERIIDAE)
- avicularis, Spondylus avicularis J.B.P.A. Lamarck, 1819 - syn of: Spondylus americanus Hermann, 1781 - (SPONDYLIDAE)
- Avicularium, Genus Avicularium Gray, 1853 † (TRIDACNIDAE) (FOSSIL)
- aviculatum, Entolium aviculatum Shumard & Swallow, 1858 † - syn of: Pernopecten ohioensis Newell, 1938 † - (ENTOLIIDAE) (FOSSIL)
- AVICULIDAE - syn of Family: PTERIIDAE
- aviculina, Cardita aviculina J.B.P.A. Lamarck, 1819 - (CARDITIDAE)
- aviculina, Pteria aviculina G.P. Deshayes, 1858 † - (PTERIIDAE) (FOSSIL)
- aviculina excavata, Cardita aviculina excavata G.P. Deshayes, 1854 - (CARDITIDAE)
- Aviculocardium, Genus Aviculocardium Bagdasaryan, 1978 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- Aviculocephaloconus, Genus Aviculocephaloconus Chen Yiyuan & Chang Shushen, 1980 † (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- aviculoides, Anadara aviculoides L.A. Reeve, 1844 - syn of: Anadara formosa (G.B. I Sowerby, 1833) - (ARCIDAE)
- aviculoides, Arca aviculoides L.A. Reeve, 1844 - syn of: Anadara formosa (G.B. I Sowerby, 1833) - (ARCIDAE)
- aviculoides, Gervillella aviculoides (Sowerby, 1814 †) - (BAKEVELLIIDAE) (FOSSIL)
- aviculoides, Cyclochlamys aviculoides (E.A. Smith, 1885) - (CYCLOCHLAMYDIDAE)
- aviculoides, Limopsis aviculoides T.A. Conrad, 1862 † - (LIMOPSIDAE) (FOSSIL)
- aviculoides, Avimactra aviculoides Andrussov 1905 † - (MACTRIDAE) (FOSSIL)
- aviculoides, Myalina aviculoides F.B. Meek & Hayden, 1860 † - (MYALINIDAE) (FOSSIL)
- aviculoides, Pecten aviculoides E.A. Smith, 1885 - syn of: Cyclochlamys aviculoides (E.A. Smith, 1885) - (PECTINIDAE)
- aviculoides, Philobrya aviculoides (C. Vélain, 1877) - (PHILOBRYIDAE)
- Aviculolima, Genus Aviculolima Philippi, 1900 † (LIMIDAE) (FOSSIL)
- Aviculomonotis, Subgenus Pseudomonotis (Aviculomonotis) Reed, 1944 † (PSEUDOMONOTIDAE) (FOSSIL)
- Aviculomya, Genus Aviculomya Holzapfel, 1889 † (BIVALVIA INCERTAE SEDIS) (FOSSIL)
- Aviculomyalina, Genus Aviculomyalina Assman, 1916 † (MYALINIDAE) (FOSSIL)
- Aviculopecten, Genus Aviculopecten McCoy, 1851 † (AVICULOPECTINIDAE) (FOSSIL)
- AVICULOPECTINIDAE Meek & Hayden, 1865 † - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-PECTINIDA [Order]-AVICULOPECTINOIDEA [Superfamily]) (FOSSIL)
- Aviculoperna, Genus Aviculoperna A.E.M. Cossmann, 1887 † (PTERIIDAE) (FOSSIL)
- Aviculopinna, Genus Aviculopinna Meek, 1864 † (PINNIDAE) (FOSSIL)
- Aviculovulsa, Genus Aviculovulsa A.E.M. Cossmann, 1887 † (MALLEIDAE) (FOSSIL)
- aviformis, Aviculopecten aviformis Whidborne, 1889 † - (AVICULOPECTINIDAE) (FOSSIL)
- aviformis, Bigalea aviformis Karczewski, 1987 † - (PSEUDOBIGALEAIDAE) (FOSSIL)
- avilai, Assiminea avilai J.J. Van Aartsen, 2008 - (ASSIMINEIDAE)
- avilianensis, Valvata avilianensis C. Pollonera, 1888 † - (VALVATIDAE) (FOSSIL)
- Avilionella, Genus Avilionella Flower, 1952 † (BARRANDOCERATIDAE) (FOSSIL)
- Avimactra, Genus Avimactra Andrussov, 1905 † (MACTRIDAE) (FOSSIL)
- avira, Inodrillia avira P. Bartsch, 1943 - (HORAICLAVIDAE)
- avirostra, Crepidula avirostra N.E. Weisbord, 1962 - syn of: Crepidula cymbaeformis T.A. Conrad, 1844 - (CALYPTRAEIDAE)
- avirostris, Conchorhynchus avirostris (von Schlotheim, 1820 †) - (CEPHALOPODA (UNASSIGNED)) (FOSSIL)
- avirostris, Pterotheca avirostris Huxley & Etheridge, 1865 † - (PTEROTHECIDAE) (FOSSIL)
- avis, Illyricocongeria avis (Kochansky-Devidé, 1981 †) - (DREISSENIDAE) (FOSSIL)
- avis, Plethocardia avis Krasilova, 1979 † - (PLETHOCARDIIDAE) (FOSSIL)
- avisanensis, Hydrobia avisanensis C.F. Fontannes, 1877 † - (HYDROBIIDAE) (FOSSIL)
- Aviscutum, syn of: Genus Scutus P.D. Montfort, 1810 (FISSURELLIDAE)
- avisii, Cheilotomona avisii (Böhm, 1895 †) - (MURCHISONIIDAE) (FOSSIL)
- avita, Arctostrea avita J.H.F. Douvillé, 1916 † - (ARCTOSTREIDAE) (FOSSIL)
- avita, Strophiops avita C.J. Maynard, 1913 - (CERIONIDAE)
- avita, Merelina avita J. Marwick, 1928 † - (RISSOIDAE) (FOSSIL)
- avitensis, Caryocorbula revoluta avitensis A.E.M. Cossmann & M.A. Peyrot, 1909 - (CORBULIDAE)
- avitensis, Miltha avitensis A.E.M. Cossmann & M.A. Peyrot, 1921 † - (LUCINIDAE) (FOSSIL)
- avitensis, Ocinebrina avitensis (A.E.M. Cossmann & M.A. Peyrot, 1923 †) - (MURICIDAE) (FOSSIL)
- avitensis, Ocenebra avitensis A.E.M. Cossmann & M.A. Peyrot, 1923 † - (MURICIDAE) (FOSSIL)
- avitensis, Lithophaga avitensis C. Mayer, 1867 - syn of: Lithophaga lithophaga (C. Linnaeus, 1758) - (MYTILIDAE)
- avitensis, Hinia avitensis M.A. Peyrot, 1925 † - syn of: Dorsanum lineolatum (J.P.S. Grateloup, 1834 †) - (NASSARIIDAE) (FOSSIL)
- avitensis, Turbonilla avitensis A.E.M. Cossmann & M.A. Peyrot, 1917 † - (PYRAMIDELLIDAE) (FOSSIL)
- avitensis, Gibbula eichwaldi avitensis A.E.M. Cossmann & M.A. Peyrot, 1916 † - (TROCHIDAE) (FOSSIL)
- avitensis, Marcia avitensis (A.E.M. Cossmann, 1895 †) - (VENERIDAE) (FOSSIL)
- avitus, Proavites avitus Arthaber, 1896 † - syn of: Proavites hueffeli Arthaber, 1896 † - (PINACOCERATIDAE) (FOSSIL)
- avius, Austropyrgus avius A. Clark, W.B. Miller & W.F. Ponder, 2003 - (HYDROBIIDAE)
- avo, Boucardicus avo K.C. Emberton, 2010 - (CYCLOPHORIDAE)
- Avoceras, Genus Avoceras Sepkoski, Jr., 2002 † (BASSLEROCERATIDAE) (FOSSIL)
- avona, Americardia avona H.G. Richards, 1953 † - (CARDIIDAE) (FOSSIL)
- avonensis, Diodoceras avonensis (Dawson, 1868 †) - (TRIGONOCERATIDAE) (FOSSIL)
- avonensis, Tectariopsis avonensis K.V.W. Palmer, 1953 † - (TURBINIDAE) (FOSSIL)
- avrami, Kutatissites avrami Stoykova, 1992 † - (ANCYLOCERATIDAE) (FOSSIL)
- avrami, Holcophylloceras avrami Vašícek & al., 2014 † - (PHYLLOCERATIDAE) (FOSSIL)
- Avramidiscus, Genus Avramidiscus Vermeulen, 1996 † (HOLCODISCIDAE) (FOSSIL)
- avramsingeri, Spondylus avramsingeri M. Kovalis, 2010 - (SPONDYLIDAE)
- avunculus, Teinostoma avunculus H.A. Pilsbry, 1953 † - (TORNIDAE) (FOSSIL)
- avus, Leptachatina oryza avus H.A. Pilsbry & C.M. Cooke, 1914 - (AMASTRIDAE)
- avus, Bactroceras avus Holm, 1898 † - (BALTOCERATIDAE) (FOSSIL)
- avus, Cochlioceras avus K.E.I. von Eichwald, 1860 † - (BALTOCERATIDAE) (FOSSIL)
- avus, Pusio elegans avus (H.A. Pilsbry & A.A. Olsson, 1941) - (BUCCINIDAE)
- avus, Bostryx torallyi avus J.J. Parodíz, 1947 - (BULIMULIDAE)
- avus, Helminthoglypta avus P. Bartsch, 1916 - (HELMINTHOGLYPTIDAE)
- avus, Decorites avus Ruzhencev & Bogoslovskaya, 1978 † - (HOMOCERATIDAE) (FOSSIL)
- avus, Calloconus avus J. Perner, 1903 † - (METOPTOMATIDAE) (FOSSIL)
- avus, Nautilus avus Barrande, 1870 - (NAUTILIDAE)
- avus, Cyrtotoma avus P. Bartsch & J.P.E. Morrison, 1942 - syn of: Aperostoma mexicanum (K.T. Menke, 1830) - (NEOCYCLOTIDAE)
- avus, Micromenetus dilatatus avus (H.A. Pilsbry, 1905) - (PLANORBIDAE)
- avus, Potamides avus H.A. Pilsbry & J. Brown, 1917 † - (POTAMIDIDAE) (FOSSIL)
- awa, Alvania awa K. Chinzei, 1959 - (RISSOIDAE)
- awaajensis, Tibersyrnola awaajensis (G.G. Wissema, 1947 †) - (PYRAMIDELLIDAE) (FOSSIL)
- awadi, Mitraria awadi Abbass, 1967 † - (MITRIDAE) (FOSSIL)
- Awadia, syn of: Genus Nemocardium F.B. Meek, 1876 (CARDIIDAE)
- awaensis, Euhadra awaensis H.A. Pilsbry, 1902 - (BRADYBAENIDAE)
- awaensis, Mesophaedusa hickonis awaensis J.T. Kuroda & J.M. Abe, 1980 - (CLAUSILIIDAE)
- awaensis, Chamalycaeus satsumanus awaensis (H.A. Pilsbry & Y. Hirase, 1904) - (CYCLOPHORIDAE)
- awaensis, Helicarion awaensis H.A. Pilsbry, 1902 - (HELICARIONIDAE)
- awajianus, Nanonavis awajianus M. Ichikawa & K. Maeda, 1958 † - (PARALLELODONTIDAE) (FOSSIL)
- awajianus, Indogrammatodon awajianus M. Ichikawa & K. Maeda, 1958 † - syn of: Nanonavis awajianus M. Ichikawa & K. Maeda, 1958 † - (PARALLELODONTIDAE) (FOSSIL)
- awajiense, Didymoceras awajiense Yabe, 1901 † - (NOSTOCERATIDAE) (FOSSIL)
- awajiensis, Aegista awajiensis H.A. Pilsbry, 1901 - syn of: Trishoplita dacostae awajiensis (H.A. Pilsbry, 1901) - (BRADYBAENIDAE)
- awajiensis, Trishoplita dacostae awajiensis (H.A. Pilsbry, 1901) - (BRADYBAENIDAE)
- awajiensis, Hemiphaedusa awajiensis H.A. Pilsbry, 1900 - (CLAUSILIIDAE)
- awajiensis, Corbicula awajiensis H.A. Pilsbry, 1901 - (CYRENIDAE)
- awajiensis, Pachydiscus awajiensis (C.A. von Zittel 1884 †) - (DESMOCERATIDAE) (FOSSIL)
- awajiensis, Pecten awajiensis H.A. Pilsbry, 1905 - syn of: Volachlamys hirasei awajiensis (H.A. Pilsbry, 1905) - (PECTINIDAE)
- awajiensis, Volachlamys hirasei awajiensis (H.A. Pilsbry, 1905) - (PECTINIDAE)
- awajiensis, Odostomia awajiensis S. Nomura, 1938 - syn of: Marginodostomia suturamarginata (S. Nomura, 1936) - (PYRAMIDELLIDAE)
- awajiensis, Macoma awajiensis G.B. III Sowerby, 1914 - syn of: Sylvanus lilium (S.C.T. Hanley, 1844) - (TELLINIDAE)
- awajiensis, Terebra awajiensis H.A. Pilsbry, 1904 - syn of: Strioterebrum japonicum (E.A. Smith, 1873) - (TEREBRIDAE)
- awajiensis, Gibbula awajiensis G.B. III Sowerby, 1914 - syn of: Conotalopia mustelina (A.A. Gould, 1861) - (TROCHIDAE)
- awajiensis shikokuensis, Hemiphaedusa awajiensis shikokuensis H.A. Pilsbry, 1901 - (CLAUSILIIDAE)
- awajiensis sus, Hemiphaedusa awajiensis sus (H.A. Pilsbry, 1903) - (CLAUSILIIDAE)
- Awajitrochus, syn of: Genus Lirularia W.H. Dall, 1909 (TROCHIDAE)
- awakinoensis, Zemacies awakinoensis A.W.B. Powell, 1942 † - (BORSONIIDAE) (FOSSIL)
- awakinoensis, Inglisella awakinoensis C.R. Laws, 1935 † - (CANCELLARIIDAE) (FOSSIL)
- awakinoensis, Austroclavus awakinoensis A.W.B. Powell, 1942 † - (DRILLIIDAE) (FOSSIL)
- awakinoensis, Pleurotomaria awakinoensis Begg & J. Grant-Mackie, 2003 † - (PLEUROTOMARIIDAE) (FOSSIL)
- awakinoensis, Mormulasta awakinoensis (C.R. Laws, 1937 †) - (PYRAMIDELLIDAE) (FOSSIL)
- awakinoensis, Eubela awakinoensis A.W.B. Powell, 1942 † - (RAPHITOMIDAE) (FOSSIL)
- awalycaeoides, Metalycaeus awalycaeoides B. Páll-Gergely & A. Hunyadi, 2017 - (CYCLOPHORIDAE)
- Awalycaeus, syn of: Genus Alycaeus J.E. Gray, 1850 (CYCLOPHORIDAE)
- awamoaensis, Drillia awamoaensis F.W. Hutton, 1873 † - syn of: Inquisitor awamoaensis (F.W. Hutton, 1873 †) - (DRILLIIDAE) (FOSSIL)
- awamoaensis, Acirsa awamoaensis (P. Marshall & R. Murdoch, 1921 †) - (EPITONIIDAE) (FOSSIL)
- awamoaensis, Inquisitor awamoaensis (F.W. Hutton, 1873 †) - (PSEUDOMELATOMIDAE) (FOSSIL)
- awamoaensis, Alvania awamoaensis (Finlay, 1924 †) - (RISSOIDAE) (FOSSIL)
- awamoaensis, Pleurotoma awamoaensis F.W. Hutton, 1873 † - syn of: Inquisitor awamoaensis (F.W. Hutton, 1873 †) - (TURRIDAE) (FOSSIL)
- awamoaensis, Pseudoinquisitor awamoaensis F.W. Hutton, 1873 † - syn of: Inquisitor awamoaensis (F.W. Hutton, 1873 †) - (TURRIDAE) (FOSSIL)
- awamoaensis, Zeacolpus awamoaensis J. Marwick, 1971 † - (TURRITELLIDAE) (FOSSIL)
- awamoana, Barbatia awamoana Finlay, 1930 † - (ARCIDAE) (FOSSIL)
- awamoana, Dolicrossea awamoana Finlay, 1930 † - (ELACHISINIDAE) (FOSSIL)
- awamoana, Neilo awamoana Finlay, 1926 † - (MALLETIIDAE) (FOSSIL)
- awamoana, Cosa awamoana (C.R. Laws, 1941 †) - (PHILOBRYIDAE) (FOSSIL)
- awamoana, Turbonilla awamoana C.R. Laws, 1937 † - (PYRAMIDELLIDAE) (FOSSIL)
- awamoana, Zetela awamoana C.R. Laws, 1939 † - (SOLARIELLIDAE) (FOSSIL)
- awamoana, Proterato awamoana Schilder, 1933 † - (TRIVIIDAE) (FOSSIL)
- awamoanus, Prototyphis awamoanus (Finlay, 1930 †) - (MURICIDAE) (FOSSIL)
- awamoensis, Cyclocardia awamoensis (G.F. Harris, 1897 †) - (CARDITIDAE) (FOSSIL)
- awana, Anachis awana M. Yokoyama, 1924 - syn of: Anachis sinensis (G.B. II Sowerby, 1894) - (COLUMBELLIDAE)
- awana, Hiatella arctica awana (M. Yokoyama, 1924) - (HIATELLIDAE)
- awana, Phosinella media awana (M. Yokoyama, 1924 †) - (RISSOINIDAE) (FOSSIL)
- awana, Petricola awana M. Yokoyama, 1924 - syn of: Hiatella arctica awana (M. Yokoyama, 1924) - (VENERIDAE)
- awania, Helminthoglypta nickliniana awania P. Bartsch, 1919 - (HELMINTHOGLYPTIDAE)
- Awanuia, Genus Awanuia A. Powell, 1927 (ACLIDIDAE)
- awapa, Doto awapa J.A. Ortea, 2001 - (DOTIDAE)
- Awarua, syn of: Genus Pseudotorinia F. Sacco, 1892 (ARCHITECTONICIDAE)
- awashimana, Aegista pannosa awashimana H.A. Pilsbry & Y. Hirase, 1904 - (BRADYBAENIDAE)
- awasimulans, Turbonilla awasimulans C.R. Laws, 1937 † - (PYRAMIDELLIDAE) (FOSSIL)
- awaterensis, Spinomelon awaterensis L. C. King, 1934 † - (VOLUTIDAE) (FOSSIL)
- Awateria, Genus Awateria H.H. Suter, 1917 (BORSONIIDAE)
- awateria, Eumarcia awateria A.G. Beu, 1970 † - (VENERIDAE) (FOSSIL)
- awatii, Bursa awatii H.C. Ray, 1949 - (BURSIDAE)
- awatii irregularis, Bursa awatii irregularis T. Cossignani, 1994 - (BURSIDAE)
- awatii minima, Bursa awatii minima T. Cossignani, 1994 - (BURSIDAE)
- awatii regularis, Bursa awatii regularis A.G. Beu, 1994 - (BURSIDAE)
- awatubu, Odostomella awatubu (S. Nomura, 1938 †) - (PYRAMIDELLIDAE) (FOSSIL)
- awatumida, Odostomia awatumida C.R. Laws, 1939 † - (PYRAMIDELLIDAE) (FOSSIL)
- awaziensis, Kleinella awaziensis S. Nomura, 1939 - (PYRAMIDELLIDAE)
- awazuensis, Vaugonia awazuensis Kobayashi, 1957 † - (MYOPHORELLIDAE) (FOSSIL)
- awheaensis, Cuna awheaensis A.G. Beu, 1970 † - (CONDYLOCARDIIDAE) (FOSSIL)
- Awheaturris, Genus Awheaturris A.G. Beu, 1970 (RAPHITOMIDAE)
- Awuka, syn of: Genus Jorunna L.S.R. Bergh, 1876 (DISCODORIDIDAE)
- Axelella, Genus Axelella R. Petit, 1988 (CANCELLARIIDAE)
- axeli, Turbonilla axeli P. Bartsch, 1924 - (PYRAMIDELLIDAE)
- axeliana, Zebina axeliana (L.G. Hertlein & A.M. Strong, 1951) - (ZEBINIDAE)
- axelolssoni, Anadara axelolssoni (O. Macsotay & B. Campos, 2001) - (ARCIDAE)
- axelolssoni, Calliostoma axelolssoni J.F. Quinn, 1992 - (CALLIOSTOMATIDAE)
- axelolssoni, Cancellaria axelolssoni B.M. Landau & al., 2012 † - (CANCELLARIIDAE) (FOSSIL)
- axelolssoni, Nuculana axelolssoni N.E. Weisbord, 1964 - syn of: Nuculana acuta (T.A. Conrad, 1831) - (NUCULANIDAE)
- axelrodi, Rolaniconus axelrodi (J.G. Walls, 1978) - (CONIDAE)
- axi, Pseudovermis axi Er. Marcus & Ev. Marcus, 1955 - (PSEUDOVERMIDAE)
- axia, Otala axia J.R. Bourguignat, 1878 - syn of: Otala lactea (O.F. Müller, 1774) - (HELICIDAE)
- axiacus, Unio axiacus É.A.A. Locard, 1883 - syn of: Unio terminalis J.R. Bourguignat, 1852 - (UNIONIDAE)
- axiaerata, Acmaea axiaerata J.C. Verco, 1912 - syn of: Asteracmea axiaerata (J.C. Verco, 1912) - (ACMAEIDAE)
- axiaerata, Pyrene axiaerata J.C. Verco, 1910 - syn of: Mitrella menkeana (L.A. Reeve, 1858) - (COLUMBELLIDAE)
- axiaerata, Mitrella axiaerata J.C. Verco, 1910 - syn of: Mitrella menkeana (L.A. Reeve, 1858) - (COLUMBELLIDAE)
- axiaerata, Asteracmea axiaerata (J.C. Verco, 1912) - (LOTTIIDAE)
- axialis, Striatoconulus axialis Ferrari, 2014 † - (ATAPHRIDAE) (FOSSIL)
- axialis, Anacithara axialis (P. Marshall, 1918 †) - (HORAICLAVIDAE) (FOSSIL)
- axialis, Finella rufocincta axialis (C.F. Laseron, 1956) - (SCALIOLIDAE)
- axialis, Pseudoliotia axialis C.F. Laseron, 1958 - (TORNIDAE)
- axialis, Aclophora axialis C.F. Laseron, 1958 - (TRIPHORIDAE)
- axialyrae, Oscilla axialyrae Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- axicornis, Chicoreus axicornis (J.B.P.A. Lamarck, 1822) - (MURICIDAE)
- axicornis, Murex axicornis J.B.P.A. Lamarck, 1822 - syn of: Chicoreus axicornis (J.B.P.A. Lamarck, 1822) - (MURICIDAE)
- axicornis kawamurai, Chicoreus axicornis kawamurai T. Shikama, 1964 - (MURICIDAE)
- axicostata, Mitromorpha axicostata J.C. Verco, 1909 - (MITROMORPHIDAE)
- axicostata, Onoba aurivillii axicostata A.N. Golikov & V.V. Gulbin, 1978 - (RISSOIDAE)
- axicostulata, Eumetula axicostulata (Z.J.A. De Castellanos, E. Rolán & S. Bartolotta, 1987) - (NEWTONIELLIDAE)
- axicostulata, Cerithiella axicostulata Z.J.A. De Castellanos, E. Rolán & S. Bartolotta, 1987 - syn of: Eumetula axicostulata (Z.J.A. De Castellanos, E. Rolán & S. Bartolotta, 1987) - (NEWTONIELLIDAE)
- axicula, Pseudorhaphitoma axicula C. Hedley, 1922 - (MANGELIIDAE)
- Aximedia, syn of: Genus Pleurobema C.S. Rafinesque, 1819 (UNIONIDAE)
- Axina, syn of: Subgenus Calocochlia (Anixa) H.A. Pilsbry, 1894 (BRADYBAENIDAE)
- Axinactis, Genus Axinactis O.A.L. Mörch, 1861 (GLYCYMERIDIDAE)
- axinaea, Barbatia axinaea Boettger, 1883 † - (ARCIDAE) (FOSSIL)
- Axinaea, syn of: Genus Glycymeris A. da Costa, 1778 (GLYCYMERIDIDAE)
- Axinaeoderma, syn of: Genus Glycymeris A. da Costa, 1778 (GLYCYMERIDIDAE)
- Axinia, syn of: Genus Glycymeris A. da Costa, 1778 (GLYCYMERIDIDAE)
- axinia, Flattopia axinia C.O. Waterhouse, 1987 † - (SCHIZODIDAE) (FOSSIL)
- axinia, Myonia axinia J.B.M. Dana, 1849 † - syn of: Pyramus myiformis J.B.M. Dana, 1847 † - (VACUNELLIDAE) (FOSSIL)
- axiniformis, Mactra axiniformis R. Tate, 1887 † - (MACTRIDAE) (FOSSIL)
- axiniformis, Nucula axiniformis Phillips, 1829 † - (NUCULIDAE) (FOSSIL)
- axiniformis, Schizodus axiniformis (B. Phillips, 1836 †) - (SCHIZODIDAE) (FOSSIL)
- Axinoderma, syn of: Genus Glycymeris A. da Costa, 1778 (GLYCYMERIDIDAE)
- Axinodon, Genus Axinodon A.E. Verrill & K.J. Bush, 1898 (MONTACUTIDAE)
- axinoides, Phacoides axinoides (Dufour, 1881 †) - (LUCINIDAE) (FOSSIL)
- axinoides, Laevicordia axinoides (G. Seguenza, 1876) - (VERTICORDIIDAE)
- axinoides, Halicardia axinoides (G. Seguenza, 1876) - (VERTICORDIIDAE)
- Axinola, syn of: Genus Glycymeris A. da Costa, 1778 (GLYCYMERIDIDAE)
- Axinola, syn of: Genus Glycymeris A. da Costa, 1778 (GLYCYMERIDIDAE)
- Axinolobus, Genus Axinolobus Gordon , 1960 † (WELLERITIDAE) (FOSSIL)
- Axinopsida, Genus Axinopsida A.M. Keen & A.L. Chavan, 1951 (THYASIRIDAE)
- Axinopsis, syn of: Genus Axinopsida A.M. Keen & A.L. Chavan, 1951 (THYASIRIDAE)
- Axinulus, Genus Axinulus A.E. Verrill & K.J. Bush, 1898 (THYASIRIDAE)
- Axinus, Genus Axinus J. de C. Sowerby, 1821 (THYASIRIDAE)
- axion, Phanerotrema axion (J.W. Hall, 1868 †) - (PHANEROTREMATIDAE) (FOSSIL)
- axion, Pleurotomaria axion J.W. Hall, 1868 † - syn of: Phanerotrema axion (J.W. Hall, 1868 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- axionoides, Burdikinia axionoides (R. Etheridge jr., 1921 †) - (HELICOTOMIDAE) (FOSSIL)
- axiosculpta, Depressizona axiosculpta D.L. Geiger, 2009 - (DEPRESSIZONIDAE)
- axiotimus, Tornus axiotimus (J.C. Melvill & R. Standen, 1895) - (TORNIDAE)
- axiplicata, Naskia axiplicata A.V. Sysoev & D.L. Ivanov, 1985 - (HORAICLAVIDAE)
- axirugosa, Ingensia axirugosa (R.K. Dell, 1956) - (MURICIDAE)
- axirugosus, Terefundus axirugosus R.K. Dell, 1956 - syn of: Ingensia axirugosa (R.K. Dell, 1956) - (MURICIDAE)
- axis, Daphnella axis (L.A. Reeve, 1846) - (RAPHITOMIDAE)
- axis, Pleurotoma axis L.A. Reeve, 1846 - syn of: Daphnella axis (L.A. Reeve, 1846) - (TURRIDAE)
- axiscalpta, Mitromorpha axiscalpta (J.C. Verco, 1909) - (MITROMORPHIDAE)
- axiscalpta, Rissoina axiscalpta B.C. Cotton, 1952 - syn of: Rissoina iredalei C.F. Laseron, 1950 - (RISSOINIDAE)
- axisculpta, Rissoina axisculpta B.C. Cotton, 1952 - syn of: Rissoina iredalei C.F. Laseron, 1950 - (RISSOINIDAE)
- axmouthensis, Leptomaria axmouthensis Cox † - (PLEUROTOMARIIDAE) (FOSSIL)
- axonana, Trochulus axonana J.F. Mabille - syn of: Trichia plebeia (J.P.R. Draparnaud, 1805) - (HYGROMIIDAE)
- axonense, Jurassicardium axonense A.E.M. Cossmann, 1906 † - (CARDIIDAE) (FOSSIL)
- Axonoceras, Genus Axonoceras Stephenson , 1941 † (NOSTOCERATIDAE) (FOSSIL)
- axonoides, Aleteceras axonoides (Etheridge, 1909 †) - (LABECERATIDAE) (FOSSIL)
- axonoides, Crioeeras axonoides Etheridge, 1909 † - syn of: Aleteceras axonoides (Etheridge, 1909 †) - (LABECERATIDAE) (FOSSIL)
- Axymene, Genus Axymene H.J. Finlay, 1926 (MURICIDAE)
- aya, Turbonilla aya P. Bartsch, 1926 - (PYRAMIDELLIDAE)
- ayabaca, Lamelliconcha ayabaca A.A. Olsson, 1931 † - (VENERIDAE) (FOSSIL)
- ayakii, Volvatella ayakii I. Hamatani, 1972 - (VOLVATELLIDAE)
- ayaktchica, Kirengella ayaktchica Rozov, 1968 † - (KIRENGELLIDAE) (FOSSIL)
- ayamana, Turbonilla ayamana L.G. Hertlein & A.M. Strong, 1951 - (PYRAMIDELLIDAE)
- aydinensis, Idyla bicristata aydinensis A. Örstan, 2007 - (CLAUSILIIDAE)
- ayersi, Marmarostoma ayersi A.A. Olsson, 1967 - syn of: Turbo castanea J.F. Gmelin, 1791 - (TURBINIDAE)
- ayersiana, Helminthoglypta ayersiana (W. Newcomb, 1861) - (HELMINTHOGLYPTIDAE)
- Aylacostoma, Genus Aylacostoma J.B. von Spix, 1827 (THIARIDAE)
- aylardi, Meginoceras aylardi McLearn, 1947 † - (TRACHYCERATIDAE) (FOSSIL)
- aylesburiensis, Trigonia aylesburiensis Cox † - (TRIGONIIDAE) (FOSSIL)
- aylvaus, Euplecta aylvaus W.L.H. Dohrn - (ARIOPHANTIDAE)
- aymara, Biomphalaria aymara C. Valdovinos & J. Stuardo, 1991 - (PLANORBIDAE)
- aymestriensis, Bellerophon aymestriensis Murchison, 1839 † - syn of: Tremanotus aymestriensis (Murchison, 1839 †) - (BELLEROPHONTIDAE) (FOSSIL)
- aymestriensis, Tremanotus aymestriensis (Murchison, 1839 †) - (BUCANIIDAE) (FOSSIL)
- Ayna, Genus Ayna Páll-Gergely, 2009 (ENIDAE)
- aynensis, Melanopsis lorcana aynensis Azpeitia moros, 1929 - (MELANOPSIDAE)
- ayresi, Polinices ayresi C.J. Gabriel, 1962 - (NATICIDAE)
- aysensis, Lilloiconcha aysensis F.A.W. Miquel & G.M. Barker, 2009 - (HELICODISCIDAE)
- aytonensis, Astarte aytonensis J. Lycett, 1863 † - (ASTARTIDAE) (FOSSIL)
- aytonensis, Trochus aytonensis (Blake & Hudleston) † - (TROCHIDAE) (FOSSIL)
- aytosensis, Grossuana aytosensis D.G. Georgiev, 2012 - (HYDROBIIDAE)
- ayuaensis, Ventricochis ayuaensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- ayuaensis, Cenocoptis andresensis ayuaensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- ayubiana, Truncatellina ayubiana B.M. Pokryszko, K. Auffenberg, J.C. Hlavác & F. Naggs, 2009 - (VERTIGINIDAE)
- ayuensis, Chondrothyretes tenebrata ayuensis (C. de la Torre & P. Bartsch, 1938) - (POMATIIDAE)
- ayukawaensis, Odostomia ayukawaensis S. Nomura, 1938 - (PYRAMIDELLIDAE)
- azabatschensis, Lymnaea azabatschensis N.D. Kruglov & Y.I. Starobogatov, 1989 - (LYMNAEIDAE)
- azami, Poirieria azami J.T. Kuroda, 1929 - syn of: Murexsul multispinosus (G.B. III Sowerby, 1904) - (MURICIDAE)
- azamii, Cernuella azamii J.R. Bourguignat in É.A.A. Locard, 1894 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- azaniense, Cyathopoma azaniense B. Verdcourt, 1978 - (CYCLOPHORIDAE)
- azaniensis, Zebinella azaniensis (Cox, 1927 †) - (RISSOINIDAE) (FOSSIL)
- Azara, syn of: Genus Erodona F.M. Daudin in L.A.G. d'A. Bosc, 1801 (ERODONIDAE)
- Azarella, syn of: Genus Beguina P.F. Röding, 1798 (CARDITIDAE)
- Azaria, syn of: Genus Cardiocardita H.E. Anton, 1838 (CARDITIDAE)
- azaria, Saxicava azaria W.H. Dall, 1881 - syn of: Hiatella arctica (C. Linnaeus, 1767) - (HIATELLIDAE)
- azariani, Pseudotirolites azariani Rostovcev, 1983 † - syn of: Paratirolites kittli Stoyanow, 1910 † - (PSEUDOTIROLITIDAE) (FOSSIL)
- Azarianites, Genus Azarianites Daygs , 1987 † (LONGOBARDITIDAE) (FOSSIL)
- azarum, Islamia azarum (H.D. Boeters & E. Rolán, 1988) - (HYDROBIIDAE)
- Azeca, Genus Azeca W.E. Leach in J. Fleming, 1828 (COCHLICOPIDAE)
- Azecastrum, syn of: Genus Azeca W.E. Leach in J. Fleming, 1828 (COCHLICOPIDAE)
- azelotes, Epitonium azelotes W.H. Dall, 1927 - syn of: Narrimania azelotes (W.H. Dall, 1927) - (EPITONIIDAE)
- azelotes, Narrimania azelotes (W.H. Dall, 1927) - (NYSTIELLIDAE)
- azelotes, Opaliopsis azelotes W.H. Dall, 1927 - syn of: Narrimania azelotes (W.H. Dall, 1927) - (NYSTIELLIDAE)
- azemula, Oliva azemula P.L. Duclos, 1835 - syn of: Miniaceoliva tremulina azemula (P.L. Duclos, 1835) - (OLIVIDAE)
- azemula, Miniaceoliva tremulina azemula (P.L. Duclos, 1835) - (OLIVIDAE)
- azima, Columbella azima P.L. Duclos, 1846 - (COLUMBELLIDAE)
- azineae, Dendrodoris azineae D.W. Behrens & Á. Valdés, 2004 - (DENDRODORIDIDAE)
- azlense, Knemiceras azlense P.H. Scott, 1940 † - syn of: Parengonoceras roemeri (Cragin, 1893 †) - (KNEMICERATIDAE) (FOSSIL)
- azmanii, Thordisa azmanii J.L. Cervera & J.C. García-Gómez, 1989 - (DISCODORIDIDAE)
- azona, Persicula azona K.T. Menke, 1849 - syn of: Persicula cornea (J.B.P.A. Lamarck, 1822) - (CYSTISCIDAE)
- azona, Persicula azona J.B.P.A. Lamarck, 1822 - syn of: Persicula cornea (J.B.P.A. Lamarck, 1822) - (CYSTISCIDAE)
- azona, Oliva reticulata azona P. Dautzenberg, 1927 - (OLIVIDAE)
- azona, Plectopylis azona P.V. Gredler, 1887 - syn of: Sinicola reserata azona (P.V. Gredler, 1887) - (PLECTOPYLIDAE)
- azona, Sinicola reserata azona (P.V. Gredler, 1887) - (PLECTOPYLIDAE)
- azona, Syrnola azona S. Nomura, 1937 - (PYRAMIDELLIDAE)
- azonata, Satondella azonata D.L. Geiger & B.A. Marshall, 2012 - (SCISSURELLIDAE)
- azonea, Stomatia azonea Š. Brusina, 1865 - syn of: Megalomphalus azoneus (Š. Brusina, 1865) - (TROCHIDAE)
- azoneus, Megalomphalus azoneus (Š. Brusina, 1865) - (VANIKORIDAE)
- azonus, Megalomphalus azonus Š. Brusina, 1865 - syn of: Megalomphalus azoneus (Š. Brusina, 1865) - (VANIKORIDAE)
- Azor, syn of: Genus Azorinus C.A. Récluz, 1869 (SOLECURTIDAE)
- azora, Pyrene azora P.L. Duclos, 1840 - syn of: Euplica festiva (G.P. Deshayes in E.S.J.L. de Laborde & M. Linant, 1834) - (COLUMBELLIDAE)
- azora, Columbella azora P.L. Duclos, 1840 - syn of: Euplica festiva (G.P. Deshayes in E.S.J.L. de Laborde & M. Linant, 1834) - (COLUMBELLIDAE)
- azoreana, Elachisina azoreana E. Rolán & S. Gofas, 2003 - (ELACHISINIDAE)
- azorella, Massylaea azorella J.R. Bourguignat, 1883 - syn of: Massylaea azourella (J.R. Bourguignat, 1883) - (HELICIDAE)
- azorensis, Mitromorpha azorensis C. Mifsud, 2001 - (MITROMORPHIDAE)
- azorensis, Turbonilla obliquata azorensis F. Nordsieck, 1972 - (PYRAMIDELLIDAE)
- azorensis, Cingula griegi azorensis F. Nordsieck, 1972 - (RISSOIDAE)
- azorensis, Scissurella azorensis Nolt, 2008 - (SCISSURELLIDAE)
- azorensis, Solariella azorensis R.B. Watson, 1886 - (SOLARIELLIDAE)
- azorica, Brocchinia azorica (P. Bouchet & A. Warén, 1985) - (CANCELLARIIDAE)
- azorica, Admete azorica P. Bouchet & A. Warén, 1985 - syn of: Brocchinia azorica (P. Bouchet & A. Warén, 1985) - (CANCELLARIIDAE)
- azorica, Felimare picta azorica (J.A. Ortea, Á. Valdés & J.C. García-Gómez, 1996) - (CHROMODORIDIDAE)
- azorica, Cochlicopa azorica J.A. Albers, 1852 - syn of: Cochlicopa lubrica (O.F. Müller, 1774) - (COCHLICOPIDAE)
- azorica, Cuspidaria azorica (E.A. Smith, 1885) - (CUSPIDARIIDAE)
- azorica, Neaera azorica E.A. Smith, 1885 - syn of: Protocuspidaria azorica (E.A. Smith, 1885) - (CUSPIDARIIDAE)
- azorica, Gonyodiscus azorica A. Mousson, 1858 - syn of: Gonyodiscus rotundatus (O.F. Müller, 1774) - (DISCIDAE)
- azorica, Spirotropis azorica P. Bouchet & A. Warén, 1980 - (DRILLIIDAE)
- azorica, Leptaxis azorica J.A. Albers, 1852 - (HYGROMIIDAE)
- azorica, Nassarius azorica P. Dautzenberg, 1889 - syn of: Nassarius recidivus (E.C. Von Martens, 1876) - (NASSARIIDAE)
- azorica, Patella azorica T. Nuttall in J.C. Jay, 1852 - syn of: Patella ulyssiponensis J.F. Gmelin, 1791 - (PATELLIDAE)
- azorica, Tricolia pullus azorica (P. Dautzenberg, 1889) - (PHASIANELLIDAE)
- azorica, Philine azorica P. Bouchet, 1975 - (PHILINIDAE)
- azorica, Protocuspidaria azorica (E.A. Smith, 1885) - (PROTOCUSPIDARIIDAE)
- azorica, Pseudosetia azorica P. Bouchet & A. Warén, 1993 - (RISSOIDAE)
- azorica, Glandina azorica J.A. Albers, 1852 - syn of: Cochlicopa lubrica (O.F. Müller, 1774) - (SPIRAXIDAE)
- azorica, Clelandella azorica S. Gofas, 2005 - (TROCHIDAE)
- azorica, Acanthinula azorica H.A. Pilsbry, 1926 - (VALLONIIDAE)
- azorica fuscoviolacea, Nassarius azorica fuscoviolacea P.M. Pallary, 1900 - syn of: Nassarius recidivus (E.C. Von Martens, 1876) - (NASSARIIDAE)
- azoricum, Punctum azoricum A.J. de Winter, 1988 - (PUNCTIDAE)
- azoricum, Teinostoma azoricum (P. Dautzenberg & H. Fischer, 1896) - (TORNIDAE)
- azoricum, Tinostoma azoricum P. Dautzenberg & H. Fischer, 1896 - syn of: Teinostoma azoricum (P. Dautzenberg & H. Fischer, 1896) - (TORNIDAE)
- azoricus, Inopinodon azoricus (É.A.A. Locard, 1897) - (ACTEONIDAE)
- azoricus, Fusinus azoricus P. Dautzenberg, 1889 - syn of: Fusinus bocagei (P. Fischer, 1882) - (FASCIOLARIIDAE)
- azoricus, Milax azoricus H. Milne-Edwards, 1885 - syn of: Milax gagates (J.P.R. Draparnaud, 1801) - (MILACIDAE)
- azoricus, Bathymodiolus azoricus R. von Cosel & T. Comtet, 1999 - (MYTILIDAE)
- azoricus, Parviturbo azoricus F. Rubio, E. Rolán & W. Segers, 2015 - (SKENEIDAE)
- Azorilla, syn of: Genus Pleurotomella A.E. Verrill, 1872 (RAPHITOMIDAE)
- Azorinus, Genus Azorinus C.A. Récluz, 1869 (SOLECURTIDAE)
- Azoripupa, Subgenus Leiostyla (Azoripupa) H.A. Pilsbry, 1923 (LAURIIDAE)
- Azorita, syn of: Genus Pleurotomella A.E. Verrill, 1872 (RAPHITOMIDAE)
- Azorivitrina, Genus Azorivitrina F.L. Giusti, V. Fiorentino, V. Benocci & G. Manganelli, 2011 (VITRINIDAE)
- azourella, Massylaea azourella (J.R. Bourguignat, 1883) - (HELICIDAE)
- azovica, Euxinipyrgula azovica (A.N. Golikov & Y.I. Starobogatov, 1966) - (HYDROBIIDAE)
- azpeitianum, Obscurella azpeitianum A. Ortiz De Zárate - syn of: Cochlostoma bicostulatum (S. Gofas, 1989) - (COCHLOSTOMATIDAE)
- azpilicuetai, Mitrella azpilicuetai E. Rolán, 2004 - (COLUMBELLIDAE)
- azraqensis, Eutrephoceras azraqensis Al-Harithi & Ibrahim, 1992 † - (NAUTILIDAE) (FOSSIL)
- azteca, Halgerda azteca S.J. Fahey & T.M. Gosliner, 2000 - (DISCODORIDIDAE)
- azteca, Turbonilla azteca Baker, G.D. Hanna & Strong, 1926 - (PYRAMIDELLIDAE)
- azteca, Odostomia azteca A.M. Strong & L.G. Hertlein, 1939 - (PYRAMIDELLIDAE)
- azteci, Zafrona azteci K. Monsecour & D. Monsecour, 2016 - (COLUMBELLIDAE)
- aztecorum, Nephronaias aztecorum (R.A. Philippi, 1847) - (UNIONIDAE)
- aztecus, Pecten aztecus Bose, 1906 † - (PECTINIDAE) (FOSSIL)
- azucarellum, Chondropometes vignalense azucarellum C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- azucarense, Chondropometes vignalense azucarense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- azucarensis, Eutudorops troscheli azucarensis (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- azucarensis, Tomelasmus azucarensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- azuense, Chondropoma swifti azuense P. Bartsch, 1946 - (POMATIIDAE)
- azuerensis, Cyclostremiscus azuerensis H.A. Pilsbry & A.A. Olsson, 1952 - (TORNIDAE)
- azulense, Panastoma azulense H.A. Pilsbry & A.A. Olsson, 1945 - (TORNIDAE)
- azulensis, Discoleus azulensis A. Doering, 1884 - syn of: Peronaeus aguirrei azulensis (A. Doering, 1884) - (BOTHRIEMBRYONTIDAE)
- azulensis, Peronaeus azulensis C. Fernández, 1970 - (BULIMULIDAE)
- azulensis, Peronaeus aguirrei azulensis (A. Doering, 1884) - (BULIMULIDAE)
- azulensis, Nucula iphigenia azulensis A.A. Olsson, 1942 - (NUCULIDAE)
- azulensis, Plicatula azulensis Imlay, 1940 † - (PLICATULIDAE) (FOSSIL)
- azumai, Fusiaphera azumai T. Habe, 1961 - syn of: Fusiaphera macrospira producta (A. Adams & L.A. Reeve, 1850) - (CANCELLARIIDAE)
- azumai, Luchuphaedusa azumai H.A. Pilsbry, 1905 - (CLAUSILIIDAE)
- azumai, Perisserosa guttata azumai F.A. Schilder, 1960 - (CYPRAEIDAE)
- azumai, Helicarion azumai T. Habe, 1948 - (HELICARIONIDAE)
- azumai, Dentiovula azumai (C.N. Cate, 1970) - (OVULIDAE)
- azumai, Primovula azumai C.N. Cate, 1970 - syn of: Dentiovula azumai (C.N. Cate, 1970) - (OVULIDAE)
- azumai una, Luchuphaedusa azumai una (H.A. Pilsbry, 1902) - (CLAUSILIIDAE)
- Azumamorula, Subgenus Morula (Azumamorula) W.K. Emerson, 1968 (MURICIDAE)
- azumana, Limopsis azumana M. Yokoyama, 1910 - (LIMOPSIDAE)
- Azumapecten, Genus Azumapecten T. Habe, 1977 (PECTINIDAE)
- Azumorula, syn of: Subgenus Morula (Azumamorula) W.K. Emerson, 1968 (MURICIDAE)
- azurea, Erronea errones azurea F.A. Schilder, 1968 - (CYPRAEIDAE)
- azurea, Asperitas bimaensis azurea (M.M. Schepman, 1892) - (DYAKIIDAE)
- azuropunctata, Oxynoe azuropunctata K.R. Jensen, 1980 - (OXYNOIDAE)
- Azyga, Genus Azyga Nützel, 1998 † (ZYGOPLEURIDAE) (FOSSIL)
- azygosorius, Colus azygosorius (R. Tiba, 1980) - (BUCCINIDAE)
- azygosorius, Fusus azygosorius R. Tiba, 1980 - syn of: Colus azygosorius (R. Tiba, 1980) - (FASCIOLARIIDAE)
- azzouzi, Vermiceras azzouzi Rakús & Guex 2002 † - (ARIETITIDAE) (FOSSIL)
- azzouzorum, Denguiria azzouzorum Boyd & Newell, 1979 † - (PTERINOPECTINIDAE) (FOSSIL)
- Ba, Genus Ba G.A. Solem, 1983 (CHAROPIDAE)
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