- asra, Drillia asra K.H.J. Thiele, 1925 - (DRILLIIDAE)
- asra, Marginella asra W. Liltved & V.G. Millard, 1994 - syn of: Marginella westhuizeni W. Massier, 1993 - (MARGINELLIDAE)
- asra, Funa asra R.N. Kilburn, 1988 - (PSEUDOMELATOMIDAE)
- assabensis, Clanculus assabensis G. Caramagna, 1888 - syn of: Clanculus tonnerrei (G. Nevill & H. Nevill, 1874) - (TROCHIDAE)
- assadovi, Euomphalia assadovi I.M. Likharev & E.S. Rammelmeyer, 1952 - syn of: Harmozica pisiformis (L. Pfeiffer, 1852) - (HYGROMIIDAE)
- assamensis, Corbicula assamensis B. Prashad, 1928 - (CYRENIDAE)
- assamicus, Raphaulus assamicus H.H. Godwin-Austen, 1886 - (PUPINIDAE)
- assecla, Euterebra assecla (T. Iredale, 1924) - (TEREBRIDAE)
- assecla, Terebra assecla T. Iredale, 1924 - syn of: Euterebra assecla (T. Iredale, 1924) - (TEREBRIDAE)
- asselense, Peripetoceras asselense Ruzhentsev & Shimanskiy, 1954 † - (LIROCERATIDAE) (FOSSIL)
- asselicum, Agathiceras asselicum Ruzhentsev, 1938 † - syn of: Agathiceras uralicum (Karpinsky, 1874 †) - (AGATHICERATIDAE) (FOSSIL)
- asselicum, Homoceras asselicum (Ruzhencev & Bogoslovskaya, 1978 †) - (HOMOCERATIDAE) (FOSSIL)
- assellina, Gibberula assellina F.P. Jousseaume, 1875 - syn of: Gibberula asellina (F.P. Jousseaume, 1875) - (CYSTISCIDAE)
- Assemania, syn of: Genus Assiminea J. Fleming, 1828 (ASSIMINEIDAE)
- asser, Ukhtoceras asser (Nalivkin, 1930 †) - (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- asser, Fusceulima asser (P. Bartsch, 1915) - (EULIMIDAE)
- asser, Turbonilla asser W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- asser, Cingula asser P. Bartsch, 1910 - (RISSOIDAE)
- Asseretoceras, syn of: Genus Bulogites Arthaber , 1912 (BALATONITIDAE) (FOSSIL)
- asseretoi, Paracrochordiceras asseretoi Fantini Sestini, 1981 † - (ACROCHORDICERATIDAE) (FOSSIL)
- asseretoi, Cuccoceras asseretoi Fantini Sestini, 1988 † - (BALATONITIDAE) (FOSSIL)
- asseretoi, Hollandites asseretoi Fantini Sestini, 1988 † - (BEYRICHITIDAE) (FOSSIL)
- asseretoi, Ananorites asseretoi C.O. Waterhouse, 2002 † - (CERATITIDA (UNASSIGNED)) (FOSSIL)
- asseretoi, Paradanubites asseretoi Fantini Sestini, 1981 † - (DANUBITIDAE) (FOSSIL)
- asseretoi, Unionvillites asseretoi Silberling & Nichols, 1982 † - (DANUBITIDAE) (FOSSIL)
- asseretoi, Japonites asseretoi Fantini Sestini, 1981 † - (GYMNITIDAE) (FOSSIL)
- asseretoi, Gymnites asseretoi Tozer, 1972 † - (GYMNITIDAE) (FOSSIL)
- asseretoi, Isculites asseretoi Fantini Sestini, 1988 † - (PARAGOCERATIDAE) (FOSSIL)
- asseretoi, Parapopanoceras asseretoi Dagys & Ermakova, 1981 † - (PARAPOPANOCERATIDAE) (FOSSIL)
- asseretoi, Ziyunites asseretoi Fantini Sestini, 1981 † - (STURIIDAE) (FOSSIL)
- asseretoi, Leiophyllites asseretoi Fantini Sestini, 1981 † - (USSURITIDAE) (FOSSIL)
- assertonsoris, Pseudozygopleura assertonsoris Knight, 1930 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- assesi, Protornoceras assesi Göddertz, 1987 † - syn of: Trevoneites assesi (Göddertz, 1987 †) - (KIRSOCERATIDAE) (FOSSIL)
- assesi, Trevoneites assesi (Göddertz, 1987 †) - (PARODOCERATIDAE) (FOSSIL)
- assicola, Albinaria jonica assicola T.C.M. Kemperman & E. Gittenberger, 1990 - (CLAUSILIIDAE)
- assidua, Poleumita assidua J. Perner, 1903 † - syn of: Oriostoma assidua (J. Perner, 1903 †) - (EUOMPHALIDAE) (FOSSIL)
- assidua, Oriostoma assidua (J. Perner, 1903 †) - (ORIOSTOMATIDAE) (FOSSIL)
- assilina, Astarte assilina A.V.M.D. D'Orbigny, 1850 † - (ASTARTIDAE) (FOSSIL)
- assilorenzoi, Leptoconus locumtenens assilorenzoi (T. Cossignani & A. Assi, 2016) - (CONIDAE)
- Assimania, syn of: Genus Assiminea J. Fleming, 1828 (ASSIMINEIDAE)
- assimilans, Clionella assimilans W.H. Turton, 1932 - syn of: Clavatula tripartita (H.C. Weinkauff, 1876) - (CLAVATULIDAE)
- assimilans, Turbonilla assimilans E.A. Smith, 1890 - (PYRAMIDELLIDAE)
- assimilans, Annabellia assimilans (J.C. Cox, 1864) - (RHYTIDIDAE)
- assimilaris, Bradybaena similaris assimilaris (P.V. Gredler, 1878) - (BRADYBAENIDAE)
- assimilata, Seila assimilata (C.B. Adams, 1852) - (CERITHIOPSIDAE)
- assimile, Buccinum assimile L.A. Reeve, 1846 - syn of: Pollia assimilis (L.A. Reeve, 1846) - (BUCCINIDAE)
- assimile, Vasticardium assimile (L.A. Reeve, 1844) - (CARDIIDAE)
- assimile lacunosum, Vasticardium assimile lacunosum (L.A. Reeve, 1845) - (CARDIIDAE)
- Assimilidonax, syn of: Genus Donax C. Linnaeus, 1758 (DONACIDAE)
- assimilis, Achatinella assimilis W. Newcomb - syn of: Amastra assimilis (W. Newcomb, 1854) - (ACHATINELLIDAE)
- assimilis, Amastra assimilis (W. Newcomb, 1854) - (AMASTRIDAE)
- assimilis, Acusta assimilis A. Adams, 1866 - (BRADYBAENIDAE)
- assimilis, Pollia assimilis (L.A. Reeve, 1846) - (BUCCINIDAE)
- assimilis, Cantharus assimilis Auct. non L.A. Reeve - syn of: Euthria calderoni E. Rolán, 1985 - (BUCCINIDAE)
- assimilis, Anna assimilis L.A. Reeve, 1846 - syn of: Pollia assimilis (L.A. Reeve, 1846) - (BUCCINIDAE)
- assimilis, Bulimus assimilis E.A. Rossmässler, 1837 - syn of: Peristoma rupestris I. Krynicki, 1833 - (BULIMULIDAE)
- assimilis, Conus assimilis A. Adams, 1855 - syn of: Pionoconus magus (C. Linnaeus, 1758) - (CONIDAE)
- assimilis, Pusia assimilis A. Garrett, 1873 - syn of: Vexillum crocatum (J.B.P.A. Lamarck, 1811) - (COSTELLARIIDAE)
- assimilis, Cylichna assimilis A. Adams, 1862 - (CYLICHNIDAE)
- assimilis, Donax assimilis S.C.T. Hanley, 1845 - (DONACIDAE)
- assimilis, Fusinus assimilis (A. Adams, 1856) - (FASCIOLARIIDAE)
- assimilis, Glycymeris assimilis G.B. I Sowerby, 1833 - syn of: Axinactis inaequalis (G.B. I Sowerby, 1832) - (GLYCYMERIDIDAE)
- assimilis, Haliotis kamtschatkana assimilis W.H. Dall, 1878 - (HALIOTIDAE)
- assimilis, Tzankoviceras assimilis (Uhlig, 1883 †) - (LEPTOCERATOIDIDAE) (FOSSIL)
- assimilis, Leptochiton assimilis K.H.J. Thiele, 1909 - syn of: Leptochiton rugatus (P.P. Carpenter in H.A. Pilsbry, 1892) - (LEPTOCHITONIDAE)
- assimilis, Wallucina assimilis (G.F. Angas, 1867) - (LUCINIDAE)
- assimilis, Propebela assimilis (Sars, 1878) - (MANGELIIDAE)
- assimilis, Strigatella assimilis W.H. Pease, 1868 - (MITRIDAE)
- assimilis, Mitra assimilis A. Garrett, 1873 - syn of: Vexillum crocatum (J.B.P.A. Lamarck, 1811) - (MITRIDAE)
- assimilis, Atrina assimilis (L.A. Reeve, 1858) - (PINNIDAE)
- assimilis, Chondrothyrella assimilis (J. Gundlach in L. Pfeiffer, 1863) - (POMATIIDAE)
- assimilis, Bouchetmella assimilis A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- assimilis, Parthenina assimilis Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- assimilis, Rissoina assimilis C.F. Jickeli, 1882 - syn of: Rissoina bertholleti A. Issel, 1869 - (RISSOINIDAE)
- assimilis, Tellina assimilis S.C.T. Hanley, 1844 - (TELLINIDAE)
- assimilis, Terebra assimilis W.H. Pease, 1871 - syn of: Strioterebrum plumbeum (J.R.C. Quoy & J.P. Gaimard, 1833) - (TEREBRIDAE)
- assimilis, Acus assimilis G.F. Angas, 1867 - syn of: Euterebra tristis (G.P. Deshayes, 1859) - (TEREBRIDAE)
- assimilis, Vitrinella assimilis K.H.J. Thiele, 1925 - (TORNIDAE)
- assimilis, Turbo assimilis L.C. Kiener, 1847 - syn of: Turbo fluctuosus W. Wood, 1828 - (TURBINIDAE)
- assimilis, Turritella assimilis Sowerby, 1840 † - (TURRITELLIDAE) (FOSSIL)
- assimilis, Anodonta assimilis H.T. von Gallenstein, 1852 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- assimilis, Tomelasmus assimilis (R. Arango, 1884) - (UROCOPTIDAE)
- assimilis, Tawera assimilis (F.W. Hutton, 1873 †) - (VENERIDAE) (FOSSIL)
- assimilis abronensis, Chondrothyrella assimilis abronensis C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- assimilis antoniensis, Tomelasmus assimilis antoniensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- assimilis cisnerosi, Chondrothyrella assimilis cisnerosi C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- assimilis gemma, Chondrothyrella assimilis gemma C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- assimilis guirensis, Chondrothyrella assimilis guirensis C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- assimilis maceoi, Chondrothyrella assimilis maceoi C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- assimilis panamensis, Donax assimilis panamensis R.A. Philippi, 1849 - (DONACIDAE)
- assimilis signata, Chondrothyrella assimilis signata C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- assimilis subassimilis, Amastra assimilis subassimilis A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- Assiminea, Genus Assiminea J. Fleming, 1828 (ASSIMINEIDAE)
- ASSIMINEIDAE H. & A. Adams, 1856 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-LITTORINIMORPHA [Order]-TRUNCATELLOIDEA [Superfamily])
- Assiminella, syn of: Genus Paludinella L. Pfeiffer, 1841 (ASSIMINEIDAE)
- Assiminia, syn of: Genus Assiminea J. Fleming, 1828 (ASSIMINEIDAE)
- Assiminopsis, syn of: Subgenus Assiminea (Taiwanassiminea) J.T. Kuroda & T. Habe, 1950 (ASSIMINEIDAE)
- Assiminopsis, syn of: Genus Benthonella W.H. Dall, 1889 (RISSOIDAE)
- assinboiensis, Pecten assinboiensis H.D. Russell & Landes, 1937 † - (PECTINIDAE) (FOSSIL)
- assiniboiensis, Nucula assiniboiensis H.D. Russell & Landes, 1937 † - (NUCULIDAE) (FOSSIL)
- assiniensis, Corbula assiniensis M.A. Chaper, 1885 - syn of: Potamocorbula adusta (L.A. Reeve, 1844) - (CORBULIDAE)
- assisi, Trophon assisi J.E. Tenison-Woods, 1877 - syn of: Bedeva paivae (J.C.H. Crosse, 1864) - (MURICIDAE)
- assisi, Pugnellus assisi Muniz, 1993 † - (PUGNELLIDAE) (FOSSIL)
- assmanni, Omphaloptycha assmanni M. Schmidt † - (COELOSTYLINIDAE) (FOSSIL)
- associata, Faustina faustina associata (E.A. Rossmässler, 1835) - (HELICIDAE)
- assu, Terebra assu L.R.L. Simone, 2012 - (TEREBRIDAE)
- Assula, syn of: Genus Scaphander P.D. Montfort, 1810 (SCAPHANDRIDAE)
- assularum, Ringicula assularum R.B. Watson, 1883 - (RINGICULIDAE)
- assyria, Turris assyria B.M. Olivera, Seronay & A.E. Fedosov, 2010 - syn of: Turris babylonia assyria B.M. Olivera, Seronay & A.E. Fedosov, 2010 - (TURRIDAE)
- assyria, Turris babylonia assyria B.M. Olivera, Seronay & A.E. Fedosov, 2010 - (TURRIDAE)
- Assyriella, Subgenus Levantina (Assyriella) P. Hesse, 1908 (HELICIDAE)
- Assytilus, Genus Assytilus Berezovsky, 2015 (MYTILIDAE) (FOSSIL)
- astachovae, Groenlandites astachovae Vavilov, 1978 † - (LONGOBARDITIDAE) (FOSSIL)
- astacoides, Cenoceras astacoides (A.T. Young & Bird, 1832 †) - (CENOCERATIDAE) (FOSSIL)
- astaeus, Austrochloritis astaeus G.P.L.K. Gude, 1906 - (CAMAENIDAE)
- astafievae, Atomodesma astafievae C.O. Waterhouse & C. Chen, 2006 † - (ATOMODESMATIDAE) (FOSSIL)
- astafievae, Kolymia astafievae Biakov, 2012 † - (KOLYMIIDAE) (FOSSIL)
- astakhovae, Clypeoceras astakhovae Zakharov, 1978 † - syn of: Clypeoceratoides gantmani (A.M. Popov, 1961 †) - (CLYPEOCERATIDAE) (FOSSIL)
- astakhovi, Marcouxia astakhovi (Kummel, 1969 †) - (COLUMBITIDAE) (FOSSIL)
- astakidae, Zonites astakidae F. Riedel, 1985 - (ZONITIDAE)
- Astandes, Genus Astandes Wade, 1917 (PSEUDOTRITONIIDAE) (FOSSIL)
- astarana, Euxina talyschana astarana H. Nordsieck, 1995 - (CLAUSILIIDAE)
- Astarte, Genus Astarte J. de C. Sowerby, 1816 (ASTARTIDAE)
- astarte, Goniatites astarte A.H. Clarke, 1885 † - syn of: Tornoceras uniangulare (T.A. Conrad, 1842 †) - (GONIATITIDAE) (FOSSIL)
- astarte, Ezeiceras astarte (Fallot & Termier, 1923 †) - (HEMIHOPLITIDAE) (FOSSIL)
- astarte, Parahoplites astarte Fallot & Termier, 1923 † - syn of: Ezeiceras astarte (Fallot & Termier, 1923 †) - (PARAHOPLITIDAE) (FOSSIL)
- astarte, Tornoceras astarte A.H. Clarke, 1885 † - syn of: Tornoceras uniangulare (T.A. Conrad, 1842 †) - (TORNOCERATIDAE) (FOSSIL)
- Astartea, syn of: Genus Astarte J. de C. Sowerby, 1816 (ASTARTIDAE)
- astartea, Diplodonta astartea P. Nyst, 1835 † - (UNGULINIDAE) (FOSSIL)
- Astartella, Genus Astartella Hall, 1858 (ASTARTIDAE) (FOSSIL)
- Astartellopsis, Genus Astartellopsis Beurlen, 1954 (ASTARTIDAE) (FOSSIL)
- Astartemya, Genus Astartemya Stephenson, 1941 (ASTARTIDAE) (FOSSIL)
- ASTARTIDAE d'Orbigny, 1844 (1840) - Family (BIVALVIA-HETERODONTA [Subclass]-ARCHIHETERODONTA [Infraclass]-CARDITIDA [Order]-CRASSATELLOIDEA [Superfamily])
- astartiformis, Crassatella astartiformis R. Tate, 1886 † - (CRASSATELLIDAE) (FOSSIL)
- astartiformis, Isocardia astartiformis Münster, 1841 † - syn of: Fimbria astartiformis (Münster, 1841 †) - (GLOSSIDAE) (FOSSIL)
- astartiformis, Fimbria astartiformis (Münster, 1841 †) - (LUCINIDAE) (FOSSIL)
- astartiformis, Schafhaeutlia astartiformis (Münster, 1840 †) - (LUCINIDAE) (FOSSIL)
- astartiformis, Gonodon astartiformis Münster, 1840 † - syn of: Schafhaeutlia astartiformis (Münster, 1840 †) - (LUCINIDAE) (FOSSIL)
- astartiformis, Tancredia astartiformis Cox † - (TANCREDIIDAE) (FOSSIL)
- Astartila, Genus Astartila Dana , 1847 (MEGADESMIDAE) (FOSSIL)
- astartina, Corbicula astartina (E.C. Von Martens, 1860) - (CYRENIDAE)
- astartina, Corbicula astartina F. Haas, 1936 - syn of: Corbicula africana (C.F.F. von Krauss, 1848) - (CYRENIDAE)
- astartina, Plagiostoma astartina Thurmann, 1859 † - (LIMIDAE) (FOSSIL)
- Astartoides, Genus Astartoides Wen & Lan, 1976 (ASTARTIDAE) (FOSSIL)
- astartoides, Cyclocardia astartoides (E.C. Von Martens, 1878) - (CARDITIDAE)
- astartoides, Miodomeris astartoides (G.P. Deshayes, 1858 †) - (CARDITIDAE) (FOSSIL)
- astartoides, Rhabdopitaria astartoides (J. Gardner, 1923 †) - (VENERIDAE) (FOSSIL)
- astartoides, Venus astartoides H.H. Beck in A.T. von Middendorff, 1849 - syn of: Liocyma fluctuosa (A.A. Gould, 1841) - (VENERIDAE)
- Astartopis, Genus Astartopis Wφhrmann, 1889 (CARDIIDA (UNASSIGNED)) (FOSSIL)
- Astartopsis, Genus Astartopsis Loriol, 1891 (CARDIIDA (UNASSIGNED)) (FOSSIL)
- astaryi, Cribrarula astaryi F.A. Schilder, 1971 - syn of: Cribrarula cumingii astaryi F.A. Schilder, 1971 - (CYPRAEIDAE)
- astaryi, Cribrarula cumingii astaryi F.A. Schilder, 1971 - (CYPRAEIDAE)
- astaryi lefaiti, Cribrarula cumingii astaryi lefaiti P. Martin & G.T. Poppe, 1989 - (CYPRAEIDAE)
- astata, Cerithium vulgatum astata T.A. de M. Monterosato - (CERITHIIDAE)
- astata, Cernuella astata G. Servain, 1880 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- astathmeta, Melanopsis astathmeta Š. Brusina, 1897 † - (MELANOPSIDAE) (FOSSIL)
- astatus, Belemnites astatus (P.D. Montfort, 1808 †) - (BELEMNITELLIDAE) (FOSSIL)
- astcia, Otala astcia A. Terver - (HELICIDAE)
- Astele, Genus Astele W.J. Swainson, 1855 (CALLIOSTOMATIDAE)
- asteleformis, Heliacus asteleformis (A.W.B. Powell, 1965) - (ARCHITECTONICIDAE)
- Astelena, syn of: Genus Astele W.J. Swainson, 1855 (CALLIOSTOMATIDAE)
- astenostomoides, Ziba astenostomoides S. Nomura, 1935 - syn of: Ziba duplilirata (L.A. Reeve, 1845) - (MITRIDAE)
- Astenothyra, syn of: Genus Gangetia C.M.F. Ancey, 1890 (STENOTHYRIDAE)
- astensis, Columbellopsis astensis (L.M.D. Bellardi, 1890 †) - (COLUMBELLIDAE) (FOSSIL)
- astensis, Mitra astensis L.M.D. Bellardi, 1850 † - (MITRIDAE) (FOSSIL)
- astensis, Tectonatica astensis (F. Sacco, 1891 †) - (NATICIDAE) (FOSSIL)
- astensis, Venerupis astensis (G. Bonelli, 1827 †) - (VENERIDAE) (FOSSIL)
- astephana, Costellaria astephana J.C. Melvill, 1904 - syn of: Vexillum coronatum (G.S. Helbling, 1779) - (COSTELLARIIDAE)
- astephanum, Vexillum echinatum astephanum (J.C. Melvill, 1904) - (COSTELLARIIDAE)
- aster, Patella aster L.A. Reeve, 1855 - syn of: Cellana radiata (I. von Born, 1778) - (PATELLIDAE)
- aster, Crassispira aster P. Lozouet, 2015 - (PSEUDOMELATOMIDAE)
- aster, Trochus aster R.A. Philippi, 1848 - syn of: Lithopoma phoebium (P.F. Röding, 1798) - (TROCHIDAE)
- aster, Bellastraea aster (Tenison Woods, 1879 †) - (TURBINIDAE) (FOSSIL)
- Asteracmea, Genus Asteracmea W.R.B. Oliver, 1926 (LOTTIIDAE)
- asteranis, Pupoides asteranis D. Dupuy, 1849 - syn of: Pupoides coenopictus (F.W. Hutton, 1834) - (PUPILLIDAE)
- asteria, Mangelia asteria J. Gardner, 1937 † - (MANGELIIDAE) (FOSSIL)
- asteriae, Murexiella bojadorensis asteriae (K. Nicolay, 1997) - (MURICIDAE)
- asterianus, Potomida asterianus D. Dupuy, 1850 - syn of: Potomida littoralis (G.L.C.F.D. Cuvier, 1798) - (UNIONIDAE)
- asteriaphila, Cythnia asteriaphila P.P. Carpenter, 1864 - (EULIMIDAE)
- astericola, Pileopsis astericola A. Adams & L.A. Reeve, 1850 - syn of: Thyca astericola (A. Adams & L.A. Reeve, 1850) - (CAPULIDAE)
- astericola, Stilifer astericola W.J. Broderip, 1832 - (EULIMIDAE)
- astericola, Thyca astericola (A. Adams & L.A. Reeve, 1850) - (EULIMIDAE)
- astericola, Bolma astericola (W.H. Dall, 1925) - (TURBINIDAE)
- astericus, Pseudoliotia astericus A.A. Gould, 1859 - syn of: Pseudoliotia asteriscus (A.A. Gould, 1859) - (TORNIDAE)
- asteriophila, Vitreobalcis asteriophila T. Habe, 1989 - (EULIMIDAE)
- asteriscum, Astralium asteriscum (L.A. Reeve, 1843) - (TURBINIDAE)
- asteriscus, Helix asteriscus E.S. Morse, 1857 - syn of: Planogyra asteriscus (E.S. Morse, 1857) - (HELICIDAE)
- asteriscus, Liotia asteriscus A.A. Gould, 1859 - (LIOTIIDAE)
- asteriscus, Murex asteriscus R. Tate, 1888 † - (MURICIDAE) (FOSSIL)
- asteriscus, Pleurodiscus asteriscus R.A. Bank & H.P.M.G. Menkhorst, 1991 - (PLEURODISCIDAE)
- asteriscus, Pseudoliotia asteriscus (A.A. Gould, 1859) - (TORNIDAE)
- asteriscus, Kondoa asteriscus H.B. Baker, 1941 - (TROCHOMORPHIDAE)
- asteriscus, Astralium stellare asteriscus (L.A. Reeve, 1842) - (TURBINIDAE)
- asteriscus, Planogyra asteriscus (E.S. Morse, 1857) - (VALLONIIDAE)
- asterizans, Cyclope asterizans P.D. Montfort, 1810 - syn of: Cyclope neritea (C. Linnaeus, 1758) - (NASSARIIDAE)
- Asteroceras, Genus Asteroceras Spath, 1925 (ARIETITIDAE) (FOSSIL)
- Asteroconites, Genus Asteroconites Teller , 1885 (AULACOCERATIDAE) (FOSSIL)
- asteroeides, Pholidotrope asteroeides Vilvens, 2017 - (CHILODONTIDAE)
- asteroessa, Histioteuthis asteroessa C. Chun, 1910 - (HISTIOTEUTHIDAE)
- Asterohelix, Genus Asterohelix Szabσ, 1984 (DISCOHELICIDAE) (FOSSIL)
- asteroideum, Salpingostoma asteroideum Reed, 1921 † - syn of: Grandostoma grande (J. Perner, 1903 †) - (BUCANIIDAE) (FOSSIL)
- asteroideus, Hyolithes asteroideus Reed, 1909 † - (HYOLITHIDAE) (FOSSIL)
- Asterolamia, Genus Asterolamia A. Warιn, 1980 (EULIMIDAE)
- ASTERONOTIDAE - syn of Family: DISCODORIDIDAE
- Asteronotus, Genus Asteronotus C.G. Ehrenberg, 1831 (DISCODORIDIDAE)
- Asterophila, Genus Asterophila J.E. Randall & H. Heath, 1965 (EULIMIDAE)
- Asteroteuthis, Subgenus Abralia (Asteroteuthis) Pfeffer, 1908 (ENOPLOTEUTHIDAE)
- asterousea, Albinaria hippolyti asterousea M. Schilthuizen, F.W. Welter-Schultes & V. Wiese, 1993 - (CLAUSILIIDAE)
- astesana, Cuvierina astesana (P.C.A.S.L. Rang, 1829 †) - (CUVIERINIDAE) (FOSSIL)
- Asthelys, Genus Asthelys J.F. Quinn, 1987 (SEGUENZIIDAE)
- Asthemotaens, syn of: Genus Asthenothaerus P.P. Carpenter, 1864 (THRACIIDAE)
- asthena, Leucochroopsis asthena (Bourguignat, 1881) † - (HYGROMIIDAE) (FOSSIL)
- asthenes, Callistochiton asthenes (S.S. Berry, 1919) - (CALLISTOPLACIDAE)
- asthenes, Aphaostracon asthenes F.G. Thompson, 1968 - (COCHLIOPIDAE)
- asthenes, Crassispira asthenes M.J. Faber, 2007 - (PSEUDOMELATOMIDAE)
- asthenika, Agathotoma asthenika E. Rolán, R. Fernández-Garcés & C. Redfern, 2012 - (MANGELIIDAE)
- Asthenoceras, Genus Asthenoceras Buckman, 1890 (SONNINIIDAE) (FOSSIL)
- Asthenocoptis, Subgenus Heterocoptis (Asthenocoptis) M.L. Jaume & C. de la Torre, 1972 (UROCOPTIDAE)
- Asthenocoptis, syn of: Genus Heterocoptis M.L. Jaume & C. de la Torre, 1972 (UROCOPTIDAE)
- asthenodon, Asthenometis asthenodon (H.A. Pilsbry & H.N. Lowe, 1932) - (TELLINIDAE)
- Asthenometis, Genus Asthenometis M. Huber, Langleit & Kreipl, 2015 (TELLINIDAE)
- asthenosomae, Echineulima asthenosomae (A. Warén, 1980) - (EULIMIDAE)
- Asthenoteuthion, syn of: Genus Lycoteuthis G.J. Pfeffer, 1900 (LYCOTEUTHIDAE)
- Asthenothaerus, Genus Asthenothaerus P.P. Carpenter, 1864 (THRACIIDAE)
- Asthenotoma, Genus Asthenotoma G.F. Harris & H.W. Burrows, 1891 (BORSONIIDAE)
- asthuriana, Albinaria hippolyti asthuriana (O. Böttger, 1878) - (CLAUSILIIDAE)
- astieri, Aeolidia astieri J.B. Vérany, 1862 - syn of: Aeolidia astieriana J.B. Vérany, 1865 - (AEOLIDIIDAE)
- astieri, Pseudomoutoniceras astieri (Sarkar, 1955 †) - (CRIOCERATITIDAE) (FOSSIL)
- Astieria, syn of: Genus Olcostephanus Neumayr , 1875 (OLCOSTEPHANIDAE) (FOSSIL)
- astieriana, Aeolidia astieriana J.B. Vérany, 1865 - (AEOLIDIIDAE)
- astieriana, Astarte astieriana A.V.M.D. D'Orbigny, 1850 † - (ASTARTIDAE) (FOSSIL)
- astieriana, Hamulina astieriana (A.V.M.D. D'Orbigny, 1850 †) - (HAMULINIDAE) (FOSSIL)
- astieriana ratschensis, Hamulina astieriana ratschensis Eristavi, 1955 † - (HAMULINIDAE) (FOSSIL)
- astierianum, Ancyloceras astierianum A.V.M.D. D'Orbigny, 1850 † - (ANCYLOCERATIDAE) (FOSSIL)
- astierianum, Astiericeras astierianum (A.V.M.D. D'Orbigny, 1851 †) - (ASTIERICERATIDAE) (FOSSIL)
- astierianum, Heteroceras astierianum d'Orbigny, 1851 † - syn of: Astiericeras astierianum (A.V.M.D. D'Orbigny, 1851 †) - (HETEROCERATIDAE) (FOSSIL)
- astierianum, Pictetia astierianum (A.V.M.D. D'Orbigny, 1841 †) - (LYTOCERATIDAE) (FOSSIL)
- astierianum, Megacrioceras astierianum (A.V.M.D. D'Orbigny, 1850 †) - (MEGACRIOCERATIDAE) (FOSSIL)
- astierianum, Eutrephoceras astierianum (A.V.M.D. D'Orbigny, 1850 †) - (NAUTILIDAE) (FOSSIL)
- astierianus, Ammonites astierianus d'Orbigny, 1840 † - syn of: Olcostephanus astierianus (A.V.M.D. D'Orbigny, 1840 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- astierianus, Olcostephanus astierianus (A.V.M.D. D'Orbigny, 1840 †) - (OLCOSTEPHANIDAE) (FOSSIL)
- astierianus, Euthymipecten astierianus (D'Orbigny 1850) † - (PTERIOIDEA (UNASSIGNED)) (FOSSIL)
- Astiericeras, Genus Astiericeras Parona & BonarellI, 1897 (ASTIERICERATIDAE) (FOSSIL)
- ASTIERICERATIDAE Breistroffer, 1953 - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-ANCYLOCERATINA [Suborder]-DOUVILLEICERATOIDEA [Superfamily]) (FOSSIL)
- Astieridiscus, Genus Astieridiscus Kilian, 1910 (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- astieriformis, Olcostephanus astieriformis Böse, 1923 † - (OLCOSTEPHANIDAE) (FOSSIL)
- astieriformis, Astieriptychites astieriformis (Voronets, 1962 †) - (POLYPTYCHITIDAE) (FOSSIL)
- astierii, Corrosella astierii (D. Dupuy, 1851) - (HYDROBIIDAE)
- astierii, Pseudamnicola astierii D. Dupuy, 1851 - syn of: Corrosella astierii (D. Dupuy, 1851) - (HYDROBIIDAE)
- Astieriptychites, Subgenus Polyptychites (Astieriptychites) Jeletzky & Kemper, 1988 (POLYPTYCHITIDAE) (FOSSIL)
- astierptychus, Astieriptychites astierptychus (Bodylevsky, 1960 †) - (POLYPTYCHITIDAE) (FOSSIL)
- astillerensis, Parrasiella astillerensis (Imlay, 1939 †) - (HIMALAYITIDAE) (FOSSIL)
- astirakariensis, Orculella astirakariensis E. Gittenberger & B. Hausdorf, 2004 - syn of: Orculella astirakiensis E. Gittenberger & B. Hausdorf, 2004 - (ORCULIDAE)
- astirakiensis, Orculella astirakiensis E. Gittenberger & B. Hausdorf, 2004 - (ORCULIDAE)
- Astoceras, Genus Astoceras Zhuravleva, 1983 (ACTINOCERIDA (UNASSIGNED)) (FOSSIL)
- astolensis, Mitrella astolensis (J.C. Melvill & R. Standen, 1901) - (COLUMBELLIDAE)
- astoma, Gittenbergia astoma O. Böttger, 1909 - syn of: Gittenbergia sororcula (L. Benoit, 1859) - (CHONDRINIDAE)
- astonensis, Cypraeovula edentula astonensis F.Jr. Lorenz & A. Hubert, 1993 - (CYPRAEIDAE)
- astonensis, Pseudomelania astonensis Hudleston † - (PSEUDOMELANIIDAE) (FOSSIL)
- astori, Macoma astori W.H. Dall, 1909 † - (TELLINIDAE) (FOSSIL)
- astoriana, Litorhadia astoriana (J. Henderson, 1920 †) - (NUCULANIDAE) (FOSSIL)
- astoriana, Propeamussium astoriana E.W.J. Moore, 1963 † - (PROPEAMUSSIIDAE) (FOSSIL)
- astra, Cystopelta astra T. Iredale, 1937 - (CYSTOPELTIDAE)
- astra, Primovula astra Y. Omi & T. Iino, 2005 - (OVULIDAE)
- Astrabralia, Subgenus Abralia (Astrabralia) Nesis, 1987 (ENOPLOTEUTHIDAE)
- astrachanica, Turricaspia astrachanica (Pirogov, 1971) - (HYDROBIIDAE)
- astrachanica, Pisidium astrachanica V.J. Timm, 1976 - syn of: Pisidium subtruncatum A.W. Malm, 1855 - (SPHAERIIDAE)
- astrachanicus, Theodoxus astrachanicus Y.I. Starobogatov, 1994 - (NERITIDAE)
- astraciformis, Hystricoceras astraciformis (Lindström, 1884 †) - (EUOMPHALIDAE) (FOSSIL)
- Astraea, syn of: Genus Partula A.E.J. Fιrussac, 1821 (PARTULIDAE)
- Astraea, Genus Astraea P.F. Rφding, 1798 (TURBINIDAE)
- astraeformis, Angaria astraeformis Klushnikov, 1958 † - (ANGARIIDAE) (FOSSIL)
- astraeicola, Clavagella astraeicola F.P. Jousseaume in É. Lamy, 1923 - syn of: Bryopa lata (W.J. Broderip, 1834) - (CLAVAGELLIDAE)
- astraensis, Valdesia astraensis Morra & del Río, 1985 † - (ARCHITECTONICIDAE) (FOSSIL)
- astrahanica, Euglesa astrahanica Pirogov & Y.I. Starobogatov in V.J. Timm, 1984 - syn of: Pisidium pirogovi (Y.I. Starobogatov, 1984) - (SPHAERIIDAE)
- astraliformis, Hystricoceras astraliformis (Lindström, 1884 †) - (EUOMPHALIDAE) (FOSSIL)
- astraliformis, Trochus astraliformis Lindström, 1884 † - syn of: Hypseloconus bessemerense Ulrich & al., 1943 † - (TROCHIDAE) (FOSSIL)
- Astralites, Genus Astralites Whiteaves, 1892 (PSEUDOPHORIDAE) (FOSSIL)
- Astralium, Genus Astralium J.H.F. Link, 1807 (TURBINIDAE)
- Astrangaria, Genus Astrangaria Pacaud, 2017 (ANGARIIDAE) (FOSSIL)
- astrapaea, Melanopsis astrapaea Š. Brusina, 1876 † - (MELANOPSIDAE) (FOSSIL)
- astrapoides, Dryptus astrapoides I.H. Jonas, 1844 - syn of: Dryptus pardalis (A.E.J. Férussac, 1821) - (AMPHIBULIMIDAE)
- astraxis, Crycoryne astraxis F.G. Thompson, 1971 - (UROCOPTIDAE)
- astrei, Cyclolobus astrei Besairie, 1936 † - syn of: Cyclolobus walkeri Diener, 1903 † - (CYCLOLOBIDAE) (FOSSIL)
- Astreptoceras, Genus Astreptoceras Henderson, 1970 (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- astricta, Engina astricta (L.A. Reeve, 1846) - (BUCCINIDAE)
- astricta, Rimula astricta J.H. McLean, 1970 - syn of: Rimula mexicana S.S. Berry, 1969 - (FISSURELLIDAE)
- astricta, Haliotis astricta L.A. Reeve, 1846 - syn of: Haliotis varia C. Linnaeus, 1758 - (HALIOTIDAE)
- astricta, Pyrgocythara astricta (L.A. Reeve, 1846) - (MANGELIIDAE)
- astricta, Strigatella pellisserpentis astricta (L.A. Reeve, 1844) - (MITRIDAE)
- astricta, Ricinula astricta L.A. Reeve, 1846 - syn of: Engina astricta (L.A. Reeve, 1846) - (MURICIDAE)
- astricta, Ennucula astricta T. Iredale, 1931 - (NUCULIDAE)
- astricta, Odostomia astricta W.H. Dall & P. Bartsch, 1907 - (PYRAMIDELLIDAE)
- astricta, Turridrupa astricta (L.A. Reeve, 1843) - (TURRIDAE)
- astricta, Meretrix astricta (L.A. Reeve, 1864) - (VENERIDAE)
- astricta consobrina, Turridrupa astricta consobrina A.W.B. Powell, 1967 - (TURRIDAE)
- astrictum, Proxiuber astrictum J. Marwick, 1965 † - (NATICIDAE) (FOSSIL)
- astrictus, Hauerites astrictus Tozer, 1994 † - (TIBETITIDAE) (FOSSIL)
- astridae, Scaphis astridae (A. Labbé, 1934) - (ONCHIDIIDAE)
- astridae, Oncidium astridae A. Labbé, 1934 - syn of: Scaphis astridae (A. Labbé, 1934) - (ONCHIDIIDAE)
- astriger, Acanthochitona astriger L.A. Reeve, 1847 - syn of: Acanthochitona astrigera (L.A. Reeve, 1847) - (ACANTHOCHITONIDAE)
- astrigera, Acanthochitona astrigera (L.A. Reeve, 1847) - (ACANTHOCHITONIDAE)
- Astrogana, syn of: Genus Armenica O. Bφttger, 1877 (CLAUSILIIDAE)
- Astrogena, Subgenus Armenica (Astrogena) M. Szekeres, 1970 (CLAUSILIIDAE)
- astrolabei, Onithochiton astrolabei A. de Rochebrune, 1881 - syn of: Onithochiton neglectus A. de Rochebrune, 1881 - (CHITONIDAE)
- astrolabei, Tellina astrolabei (P. Dautzenberg & H. Fischer, 1912) - (TELLINIDAE)
- astrolabei, Laciolina astrolabei P. Dautzenberg & H. Fischer, 1912 - syn of: Tellina astrolabei (P. Dautzenberg & H. Fischer, 1912) - (TELLINIDAE)
- astrolabensis, Otitoma astrolabensis S.G. Wiedrick, 2014 - (PSEUDOMELATOMIDAE)
- astrolabeus, Scutus astrolabeus C. Hedley, 1917 - syn of: Scutus anatinus (E. Donovan, 1820) - (FISSURELLIDAE)
- astrolabiensis, Prosipho astrolabiensis (H. Strebel, 1908) - (BUCCINIDAE)
- astrolabiensis, Bittium astrolabiensis H. Strebel, 1908 - syn of: Cerithiella astrolabiensis (H. Strebel, 1908) - (CERITHIIDAE)
- astrolabiensis, Cerithiella astrolabiensis (H. Strebel, 1908) - (NEWTONIELLIDAE)
- astrolabis, Manaria astrolabis Fraussen & Stahlschmidt, 2016 - (BUCCINIDAE)
- astrolineata, Astrabralia astrolineata (S.S. Berry, 1914) - (ENOPLOTEUTHIDAE)
- Astronacus, Subgenus Heliacus (Astronacus) Woodring, 1959 (ARCHITECTONICIDAE) (FOSSIL)
- Astronacus, syn of: Subgenus Heliacus (Torinista) T. Iredale, 1936 (ARCHITECTONICIDAE)
- astronomica, Corbicula astronomica P.M. Heude, 1887 - syn of: Corbicula fluminea (O.F. Müller, 1774) - (CYRENIDAE)
- astropalia, Albinaria brevicollis astropalia (O. Böttger, 1883) - (CLAUSILIIDAE)
- astropaliae, Melanopsis praemorsa astropaliae L. Gambetta, 1929 - (MELANOPSIDAE)
- astropectenicola, Parvioris astropectenicola (J.T. Kuroda & T. Habe, 1950) - (EULIMIDAE)
- astrophorea, Ptychodonta astrophorea (W.H. Dall, 1897) - (UROCOPTIDAE)
- astropyga, Pulicicochlea astropyga W.F. Ponder & R.U. Gooding, 1978 - (EULIMIDAE)
- Astrosanonia, Genus Astrosanonia Le Renard & P., 2003 (PICKWORTHIIDAE) (FOSSIL)
- Astrosansonia, Genus Astrosansonia J. Le Renard & P. Bouchet, 2003 (PICKWORTHIIDAE)
- astrosensis, Albinaria petrosa astrosensis H. Nordsieck, 2007 - (CLAUSILIIDAE)
- astrosticta, Abralia astrosticta S.S. Berry, 1909 - (ENOPLOTEUTHIDAE)
- astrovae, Eridites astrovae P.A. Zhuravleva, 1961 † - (SPYROCERATIDAE) (FOSSIL)
- astula, Tellina astula (C. Hedley, 1917) - (TELLINIDAE)
- astula, Pharaonella astula C. Hedley, 1917 - syn of: Tellina astula (C. Hedley, 1917) - (TELLINIDAE)
- asturiana, Parastrophia asturiana L. de Folin, 1870 - (CAECIDAE)
- asturiana, Cranopsis asturiana (P. Fischer, 1882) - (FISSURELLIDAE)
- asturiana, Plagyostila asturiana P. Fischer in L. de Folin, 1872 - (RISSOIDAE)
- Asturianaia, Genus Asturianaia Delvene, Munt & al., 2016 (MARGARITIFERIDAE) (FOSSIL)
- asturianus, Unio asturianus G. Delvene & al., 2016 † - (UNIONIDAE) (FOSSIL)
- asturica, Alzoniella asturica (H.D. Boeters & E. Rolán, 1988) - (HYDROBIIDAE)
- asturica, Spiralix asturica Quiñonero-Salgado, Ruiz-Cobo & Rolán, 2017 - (MOITESSIERIIDAE)
- asturicum, Cochlostoma asturicum (J.G.M. Raven, 1990.) - (COCHLOSTOMATIDAE)
- asturicum, Zephyroceras asturicum Kullmann, 1962 † - (GLAPHYRITIDAE) (FOSSIL)
- asturicus, Goniatites asturicus Frech, 1902 † - (GONIATITIDAE) (FOSSIL)
- asturiensis, Cryptosaccus asturiensis C.E. Prieto & A. Puente, 1994 - (HYGROMIIDAE)
- Asturoceras, Genus Asturoceras Ruzhencev & Bogoslovskaya, 1969 (DIMORPHOCERATIDAE) (FOSSIL)
- astuta, Amplirhagada astuta T. Iredale, 1939 - (CAMAENIDAE)
- astuta, Clavatula astuta M. Yokoyama, 1928 † - syn of: Paradrillia astuta (M. Yokoyama, 1928 †) - (CLAVATULIDAE) (FOSSIL)
- astuta, Drillia astuta M. Yokoyama, 1928 † - syn of: Paradrillia astuta (M. Yokoyama, 1928 †) - (DRILLIIDAE) (FOSSIL)
- astuta, Paradrillia astuta (M. Yokoyama, 1928 †) - (HORAICLAVIDAE) (FOSSIL)
- astyagis, Ziba astyagis (W.L.H. Dohrn, 1860) - (MITRIDAE)
- Astylacea, syn of: Genus Trochoidea T. Brown, 1827 (HYGROMIIDAE)
- astypalaeense, Deroceras astypalaeense A. Wiktor & M. Mylonas, 1992 - (AGRIOLIMACIDAE)
- astyridiformis, Nebularia astyridiformis J.C. Melvill, 1888 - syn of: Nebularia luctuosa A. Adams, 1853 - (MITRIDAE)
- Astyris, Genus Astyris H. Adams & A. Adams, 1853 (COLUMBELLIDAE)
- asukana, Gemmula asukana M. Yokoyama, 1928 † - (TURRIDAE) (FOSSIL)
- asunae, Turbonilla asunae A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- asuncionis, Diplodon asuncionis W.B. Marshall, 1926 - syn of: Rhipidodonta hylaea asuncionis (W.B. Marshall, 1922) - (HYRIIDAE)
- asuncionis, Rhipidodonta hylaea asuncionis (W.B. Marshall, 1922) - (HYRIIDAE)
- asuncionis, Turbonilla asuncionis A.M. Strong, 1949 - (PYRAMIDELLIDAE)
- asura, Frigidoalvania asura (M. Yokoyama, 1926) - (RISSOIDAE)
- asurai, Leptomaria asurai Das & al., 2005 † - (PLEUROTOMARIIDAE) (FOSSIL)
- Asuranena, Subgenus Turanena (Asuranena) A.A. Schileyko & S.E. Moiseeva, 1995 (ENIDAE)
- aswanensis, Pleiodon aswanensis (Cox, 1955 †) - (IRIDINIDAE) (FOSSIL)
- asy, Camya asy Hinz-Schallreuter, 1995 † - (CAMYIDAE) (FOSSIL)
- asymbleta, Limatula asymbleta W.P. Woodring, 1982 † - (LIMIDAE) (FOSSIL)
- asymmetrica, Pisinna asymmetrica (C.R. Laws, 1941) - (ANABATHRIDAE)
- asymmetrica, Cerodrillia asymmetrica J.H. McLean & L.H. Poorman, 1971 - (DRILLIIDAE)
- asymmetrica, Mactra asymmetrica Krishtofovich, 1954 † - (MACTRIDAE) (FOSSIL)
- asymmetrica, Quadratonucula asymmetrica C.O. Waterhouse, 1964 † - (MALLETIIDAE) (FOSSIL)
- asymmetrica, Pelagiella asymmetrica Ermak & Pelman, 1986 † - (PELAGIELLIDAE) (FOSSIL)
- asymmetrica, Ervilia asymmetrica M. do Carmo Marques & L.R.L. Simone, 2011 - (SEMELIDAE)
- asymmetricum, Pedioceras asymmetricum Kakabadze & Hoedemaeker, 1997 † - (ANCYLOCERATIDAE) (FOSSIL)
- asymmetricum, Chondropoma asymmetricum H.A. Pilsbry, 1933 - (POMATIIDAE)
- asymmetricus, Gyraulus fuchsi asymmetricus (Sauerzopf, 1953 ) - (PLANORBIDAE)
- Asymptoceras, Genus Asymptoceras Ryckholt, 1852 (AIPOCERATIDAE) (FOSSIL)
- asynaimos, Diplommatina asynaimos J.J. Vermeulen, 1993 - (DIPLOMMATINIDAE)
- asyndeton, Opisthostoma asyndeton J.J. Vermeulen, 1995 - (DIPLOMMATINIDAE)
- ata, Odostomia ata P. Bartsch, 1926 - (PYRAMIDELLIDAE)
- atabey, Volvarina atabey J. Espinosa, J.A. Ortea & L. Moro, 2009 - (MARGINELLIDAE)
- atacama, Mactrella atacama H.A. Pilsbry & A.A. Olsson, 1941 - syn of: Mactrotoma angusta (L.A. Reeve, 1854) - (MACTRIDAE)
- atacama, Mactra atacama H.A. Pilsbry & A.A. Olsson, 1941 - syn of: Mactrotoma angusta (L.A. Reeve, 1854) - (MACTRIDAE)
- atacama, Solemya atacama (A.G. Kuznetsov & A.A. Schileyko, 1984) - (SOLEMYIDAE)
- atacamae, Eatonina atacamae L.N. Marincovich, 1973 - (CINGULOPSIDAE)
- atacamensis, Peronaeus atacamensis (L. Pfeiffer, 1856) - (BULIMULIDAE)
- atacamensis, Littoridina atacamensis R.A. Philippi - (COCHLIOPIDAE)
- atacamensis, Astyris atacamensis Araya, Catalán & Aliaga, 2016 - (COLUMBELLIDAE)
- atacamensis, Antiquilima atacamensis I. Hayami & al., 1977 † - (LIMIDAE) (FOSSIL)
- atacata, Cylichnella atacata W.P. Woodring, 1928 † - (CYLICHNIDAE) (FOSSIL)
- atacata stigara, Cylichnella atacata stigara W.P. Woodring, 1970 † - (CYLICHNIDAE) (FOSSIL)
- atacellana, Nucula atacellana H.G. Schenck, 1939 - (NUCULIDAE)
- atachypora, Ponentina atachypora É.A.A. Locard, 1899 - syn of: Ponentina subvirescens (J.C. Bellamy, 1839) - (HYGROMIIDAE)
- atacica, Melanopsis atacica W.A. Wenz, 1928 † - (MELANOPSIDAE) (FOSSIL)
- atacicus, Ectinochilus atacicus (Doncieux, 1908 †) - (RIMELLIDAE) (FOSSIL)
- atacicus, Dientomochilus atacicus Doncieux, 1908 † - syn of: Ectinochilus atacicus (Doncieux, 1908 †) - (RIMELLIDAE) (FOSSIL)
- atacis, Monacha atacis E. Gittenberger & A.J. de Winter, 1985 - (HYGROMIIDAE)
- atacta, Planispira atacta (L. Pfeiffer, 1861) - (CAMAENIDAE)
- Atactodea, Genus Atactodea W.H. Dall, 1895 (MESODESMATIDAE)
- Atactolaoma, Genus Atactolaoma Marshall & Worthy, 2017 ? (PUNCTIDAE)
- atafona, Benthobia atafona L.R.L. Simone, 2003 - (BENTHOBIIDAE)
- Atagema, Genus Atagema J.E. Gray, 1850 (DISCODORIDIDAE)
- Atahococeras, Genus Atahococeras Niko & al., 2000 (SPYROCERATIDAE) (FOSSIL)
- atahuallpai, Clavilithes atahuallpai G.D. Hanna & Israelsky, 1925 † - (FASCIOLARIIDAE) (FOSSIL)
- atahualpa, Neopetraeus atahualpa (W.L.H. Dohrn, 1863) - (BULIMULIDAE)
- atahualpa, Cylichna atahualpa (W.H. Dall, 1908) - (CYLICHNIDAE)
- atahualpa, Epiphragmophora atahualpa H.A. Pilsbry, 1944 - (EPIPHRAGMOPHORIDAE)
- Atahualpa, syn of: Genus Thaumastus J.A. Albers, 1860 (MEGASPIRIDAE)
- atakta, Saccella atakta Gardner, 1927 - (NUCULANIDAE)
- ataktos, Eulimella ataktos A. Warén, 1991 - (PYRAMIDELLIDAE)
- Atalacmaea, syn of: Genus Atalacmea T. Iredale, 1915 (LOTTIIDAE)
- Atalacmea, Genus Atalacmea T. Iredale, 1915 (LOTTIIDAE)
- atalanta, Forbesopomus atalanta J.C. Bequaert & W.J. Clench, 1937 - (AMPULLARIIDAE)
- atalanta, Discoconcha atalanta (W.J. Clench, 1933) - (CAMAENIDAE)
- atalantae, Lucinoma atalantae R. von Cosel, 2006 - (LUCINIDAE)
- atalantae, Pliocardia atalantae (R. von Cosel & K. Olu, 2009) - (VESICOMYIDAE)
- Atalantia, Genus Atalantia Termier & Verriez, 1973 (MYOPHORIIDAE) (FOSSIL)
- atalaya, Cerithiopsis atalaya R.B. Watson, 1885 - (CERITHIOPSIDAE)
- atali, Cerithiella atali M.R. Fernandes, R. Garofalo & A. Pimenta, 2015 - (NEWTONIELLIDAE)
- atalina, Oliva atalina P.L. Duclos, 1835 - (OLIVIDAE)
- atalina stainforthii, Oliva atalina stainforthii L.A. Reeve, 1850 - (OLIVIDAE)
- Atalodoris, syn of: Genus Onchidoris H.M.D. De Blainville, 1816 (ONCHIDORIDIDAE)
- Atamarcia, Genus Atamarcia Marwick, 1927 (VENERIDAE) (FOSSIL)
- atanasiui, Melanopsis slavonica atanasiui Soverth, 1953 † - (MELANOPSIDAE) (FOSSIL)
- atanasovi, Alinda atanasovi (J. Urbanski, 1964) - (CLAUSILIIDAE)
- atanasovi kremenensis, Alinda atanasovi kremenensis I. Dedov, 2009 - (CLAUSILIIDAE)
- atanua, Enixotrophon atanua (R. Houart & J. Tröndlé, 2008) - (MURICIDAE)
- atanuiensis, Rhysoconcha atanuiensis (G.A. Solem, 1976) - (ENDODONTIDAE)
- atapensis, Viviparus atapensis Taboyakova, 1964 † - (VIVIPARIDAE) (FOSSIL)
- ATAPHRIDAE Cossmann, 1915 - Family (GASTROPODA-VETIGASTROPODA [Subclass]) (FOSSIL)
- Ataphropsis, Genus Ataphropsis Conti & Fischer, 1984 (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Ataphrus, Genus Ataphrus Gabb, 1869 (ATAPHRIDAE) (FOSSIL)
- ataturki, Thericium ataturki B.M. Landau & al., 2013 † - (CERITHIIDAE) (FOSSIL)
- atava, Mimospira atava (Moberg & Segerberg, 1906 †) - (CLISOSPIRIDAE) (FOSSIL)
- atava, Zonaria atava A. de Rochebrune, 1884 - syn of: Zonaria picta (J.E. Gray, 1824) - (CYPRAEIDAE)
- atava, Helicigona atava Wenz, 1927 † - (HELICIDAE) (FOSSIL)
- atava, Pyrgula atava Š. Brusina, 1881 † - (HYDROBIIDAE) (FOSSIL)
- atava, Tanousia atava (N.I. Andrusov, 1890 †) - (HYDROBIIDAE) (FOSSIL)
- atava, Mitra atava L.M.D. Bellardi, 1887 † - (MITRIDAE) (FOSSIL)
- atava, Modiolopsis atava E.F.R.K. Koken 1902 † - (MODIOMORPHIDAE) (FOSSIL)
- atava, Sichuanospira atava He, 1984 † - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- atava, Neithea atava (F.A. Roemer, 1839 † †) - (PECTINIDAE) (FOSSIL)
- Ataviaconcha, Genus Ataviaconcha Jakubowicz & al., 2016 (MODIOMORPHIDAE) (FOSSIL)
- atavorum, Hemicycla atavorum J.F. Mabille, 1883 - syn of: Hemicycla saulcyi carta (J.F. Mabille, 1882) - (HELICIDAE)
- atavum, Acrochordiceras atavum L. Waagen, 1895 † - (ACROCHORDICERATIDAE) (FOSSIL)
- atavum, Crussoliceras atavum (Schneid, 1914 †) - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- atavum, Cheiloceras atavum Sobolew, 1914 † - (CHEILOCERATIDAE) (FOSSIL)
- atavum, Cyrtorostra atavum (L. Waagen, 1881 †) - (DELTOPECTINIDAE) (FOSSIL)
- atavum, Oxytoma atavum L. Waagen, 1881 † - syn of: Cyrtorostra atavum (L. Waagen, 1881 †) - (OXYTOMIDAE) (FOSSIL)
- atavus, Sinuitopsis atavus J. Perner 1903 † - (CYRTOLITIDAE) (FOSSIL)
- atavus, Straparollus atavus E.F.R.K. Koken & J. Perner, 1925 † - syn of: Straparollina atavus (E.F.R.K. Koken & J. Perner, 1925 †) - (EUOMPHALIDAE) (FOSSIL)
- atavus, Cadulus atavus Finlay & J. Marwick, 1937 † - (GADILIDAE) (FOSSIL)
- atavus, Callihoplites atavus Spath, 1928 † - syn of: Callihoplites tetragonus Seeley, 1865 † - (HOPLITIDAE) (FOSSIL)
- atavus, Loripes atavus L. Waagen, 1881 † - (LUCINIDAE) (FOSSIL)
- atavus, Lithophaga atavus L. Waagen, 1881 † - (MYTILIDAE) (FOSSIL)
- atavus, Dirachis atavus Whidborne, 1891 † - (PLAGIOTHYRIDAE) (FOSSIL)
- atavus, Tritonophon atavus Troedsson, 1919 † - syn of: Tritonophon subtrilobatus (Troedsson, 1919 †) - (PLECTONOTIDAE) (FOSSIL)
- atavus, Pleurodonte atavus (L. Pfeiffer, 1842) - (PLEURODONTIDAE)
- atavus, Prionolobus atavus (L. Waagen, 1895 †) - (PROPTYCHITIDAE) (FOSSIL)
- atavus, Charonia atavus (E. Forbes, 1846) - (RANELLIDAE)
- atavus, Straparollina atavus (E.F.R.K. Koken & J. Perner, 1925 †) - (STRAPAROLLINIDAE) (FOSSIL)
- Ataxellus, syn of: Subgenus Bostryx (Geopyrgus) H.A. Pilsbry, 1896 (BULIMULIDAE)
- ataxense, Cerithium ataxense (A.V.M.D. D'Orbigny †) - (CERITHIIDAE) (FOSSIL)
- ataxia, Anodonta ataxia H.J.E. Baichère, 1891 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- ataxiaca, Trichia ataxiaca (P. Fagot, 1884) - (HYGROMIIDAE)
- ataxiaca, Aplexa ataxiaca (P. Fagot, 1883) - (PHYSIDAE)
- Ataxioceras, Genus Ataxioceras Fontannes, 1880 (PERISPHINCTIDAE) (FOSSIL)
- ATAXIOCERATIDAE Buckman, 1921 - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-PERISPHINCTOIDEA [Superfamily]) (FOSSIL)
- Ataxocerithium, Genus Ataxocerithium R. Tate, 1893 (NEWTONIELLIDAE)
- Ataxotrochus, Genus Ataxotrochus Bφhm, 1895 (HARPIDAE) (FOSSIL)
- Ataxus, Subgenus Bostryx (Ataxus) J.A. Albers, 1850 (BULIMULIDAE)
- Ataxus, syn of: Genus Bostryx F.H. Troschel, 1847 (BULIMULIDAE)
- atdabanica, Helcionella atdabanica Rozanov & Missarzhevsky, 1966 † - syn of: Igorella iacobinica D. Geyer, 1986 † - (HELCIONELLIDAE) (FOSSIL)
- atdabanica, Ilsanella atdabanica (Rozanov & Missarzhevsky, 1966 †) - (SCENELLIDAE) (FOSSIL)
- Atdabanithes, Genus Atdabanithes Meshkova, 1974 (ATDABANITHIDAE) (FOSSIL)
- ATDABANITHIDAE Meshkova, 1974 - Family (HYOLITHA-HYOLITHIDA [Order]) (FOSSIL)
- Atea, Subgenus Lamellidea (Atea) H.A. Pilsbry & C.M. Cooke, 1933 (ACHATINELLIDAE)
- Atea, syn of: Subgenus Lamellidea (Auhea) Kondo, 1962 (ACHATINELLIDAE)
- atea, Orania atea R. Houart & J. Tröndlé, 2008 - (MURICIDAE)
- atea, Triphora atea P. Bartsch, 1915 - (TRIPHORIDAE)
- ATELEASPIDAE Traquair, 1899 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-CEPHALASPIDEA [Order]) (FOSSIL)
- Ateleaspis, Genus Ateleaspis Traquair, 1889 (ATELEASPIDAE) (FOSSIL)
- ateles, Berthella ateles Á. Valdés & P. Lozouet, 2000 † - (PLEUROBRANCHIDAE) (FOSSIL)
- ateles, Cirsonella ateles (P. Dautzenberg & H. Fischer, 1896) - (SKENEIDAE)
- atelesta, Medora contracta atelesta (A.J. Wagner, 1912) - (CLAUSILIIDAE)
- atella, Nassarina atella H.A. Pilsbry & H.N. Lowe, 1932 - (COLUMBELLIDAE)
- atemeles, Aclis atemeles J.C. Melvill, 1896 - syn of: Iravadia atemeles (J.C. Melvill, 1896) - (ACLIDIDAE)
- atemeles, Iravadia atemeles (J.C. Melvill, 1896) - (IRAVADIIDAE)
- atemeles, Pseudonoba atemeles (J.C. Melvill, 1896) - syn of: Iravadia atemeles (J.C. Melvill, 1896) - (IRAVADIIDAE)
- ateni, Abida ateni E. Gittenberger, 1973 - (CHONDRINIDAE)
- ateni, Islamia ateni (H.D. Boeters, 1969) - (HYDROBIIDAE)
- ateni, Hauffenia ateni H.D. Boeters, 1969 - syn of: Islamia ateni (H.D. Boeters, 1969) - (HYDROBIIDAE)
- Atenia, Genus Atenia E. Gittenberger, 1968 (HELICODONTIDAE)
- atenuata, Subcancilla atenuata W.J. Broderip, 1836 - syn of: Ziba attenuata (W.J. Broderip, 1836) - (MITRIDAE)
- ater, Aiteng ater C.K. Swennen & Buatip, 2009 - (AITENGIDAE)
- ater, Arion ater (C. Linnaeus, 1758) - (ARIONIDAE)
- ater, Joculator ater A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- ater, Straparollus ater Spitz, 1907 † - (EUOMPHALIDAE) (FOSSIL)
- ater, Leptochiton ater H. Saito, 1997 - (LEPTOCHITONIDAE)
- ater, Milax ater (W.E. Collinge, 1895) - (MILACIDAE)
- ater, Mytilus ater J. Zelebor in R.W. Dunker & J. Zelebor, 1866 - syn of: Limnoperna pulex (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- ater, Aulacomya ater J.I. Molina, 1782 - syn of: Aulacomya atra (J.I. Molina, 1782) - (MYTILIDAE)
- ater, Mytilus ater J.I. Molina, 1782 - syn of: Aulacomya atra (J.I. Molina, 1782) - (MYTILIDAE)
- ater, Onchidium ater R.P. Lesson, 1831 - syn of: Scaphis atra (R.P. Lesson, 1831) - (ONCHIDIIDAE)
- ater, Peronia ater R.P. Lesson, 1830 - syn of: Scaphis atra (R.P. Lesson, 1831) - (ONCHIDIIDAE)
- ater, Morphotropis ater Spitz, 1907 † - (ORIOSTOMATIDAE) (FOSSIL)
- ater, Faunus ater (C. Linnaeus, 1758) - (PACHYCHILIDAE)
- ater, Strombus ater C. Linnaeus, 1758 - syn of: Faunus ater (C. Linnaeus, 1758) - (STROMBIDAE)
- ater, Clanculus ater (H.A. Pilsbry, 1901) - syn of: Clanculus microdon A. Adams, 1853 - (TROCHIDAE)
- ater, Unio ater S. Nilsson, 1822 - syn of: Unio crassus L. Philipsson in A. Retzius, 1788 - (UNIONIDAE)
- ater, Vermetus ater C. Rousseau in J.C. Chenu, 1844 - syn of: Thylacodes colubrinus (P.F. Röding, 1798) - (VERMETIDAE)
- ater, Viviparus ater G.J. De Cristofori & G. Jan, 1832 - (VIVIPARIDAE)
- ater acerosus, Viviparus ater acerosus J.R. Bourguignat, 1862 - syn of: Viviparus acerosus J.R. Bourguignat, 1862 - (VIVIPARIDAE)
- ater gallensteini, Viviparus ater gallensteini W. Kobelt, 1892 - (VIVIPARIDAE)
- ater hellenicus, Viviparus ater hellenicus (S. Clessin, 1879) - (VIVIPARIDAE)
- ater maritzanus, Viviparus ater maritzanus (F. Haas, 1913) - (VIVIPARIDAE)
- ater rufus, Arion ater rufus (C. Linnaeus, 1758) - (ARIONIDAE)
- ateralbus, Trovaoconus ateralbus (L.C. Kiener, 1850) - (CONIDAE)
- ateralbus, Monophorus ateralbus E. Rolán & R. Fernández-Garcés, 1994 - (TRIPHORIDAE)
- aterima, Lampanella aterima R.W. Dunker, 1877 - syn of: Batillaria zonalis (J.G. Bruguière, 1792) - (BATILLARIIDAE)
- aterimmum, Lampanella aterimmum R.W. Dunker, 1853 - syn of: Batillaria zonalis (J.G. Bruguière, 1792) - (BATILLARIIDAE)
- aterina, Goniobasis aterina I. Lea, 1863 - syn of: Goniobasis simplex (T. Say, 1825) - (PLEUROCERIDAE)
- aterrima, Batillaria aterrima R.W. Dunker, 1877 - syn of: Batillaria zonalis (J.G. Bruguière, 1792) - (BATILLARIIDAE)
- aterrima, Melanopsis aterrima J.R. Bourguignat, 1884 - (MELANOPSIDAE)
- aterrima, Purpura aterrima R.P. Lesson, 1842 - syn of: Purpura persica (C. Linnaeus, 1758) - (MURICIDAE)
- aterrima, Modiolus aterrima W.H. Dall, 1871 - syn of: Limnoperna atratus (C.E. Lischke, 1871) - (MYTILIDAE)
- aterrima, Nerita aterrima J.F. Gmelin, 1791 - (NERITIDAE)
- aterrima, Argonerita aterrima J.R.C. Quoy & J.P. Gaimard, 1834 - syn of: Nerita aterrima J.F. Gmelin, 1791 - (NERITIDAE)
- aterrima, Pilsbryspira aterrima (G.B. I Sowerby, 1834) - (PSEUDOMELATOMIDAE)
- atervisceralis, Eatoniella atervisceralis W.F. Ponder, 1965 - (EATONIELLIDAE)
- athabascanense, Paradiscamphiceras athabascanense Taylor, 1988 † - (PSILOCERATIDAE) (FOSSIL)
- athabascense, Acanthoceras athabascense Warren & Stelck, 1955 † - (ACANTHOCERATIDAE) (FOSSIL)
- athabaskensis, Nucula athabaskensis McLearn, 1931 † - (NUCULIDAE) (FOSSIL)
- athadona, Euplica athadona P.L. Duclos, 1840 - syn of: Euplica scripta (J.B.P.A. Lamarck, 1822) - (COLUMBELLIDAE)
- athadona, Flabellina athadona (L.S.R. Bergh, 1875) - (FLABELLINIDAE)
- athadona, Pacificoryphella athadona A.V. Martynov, 1999 † - (FLABELLINIDAE) (FOSSIL)
- athadona, Coryphella athadona L.S.R. Bergh, 1875 - syn of: Flabellina athadona (L.S.R. Bergh, 1875) - (FLABELLINIDAE)
- Athanatoceras, Genus Athanatoceras Zhuravleva, 1972 (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- athearni, Physella gyrina athearni A.H. Clarke, 1973 - (PHYSIDAE)
- athearni, Goniobasis athearni W.J. Clench & H. Turner, 1956 - (PLEUROCERIDAE)
- athearni, Pleurobema athearni Gangloff, G.C. Williams & Feminella, 2006 - (UNIONIDAE)
- Athearnia, syn of: Genus Lithasia S.S. Haldeman, 1840 (PLEUROCERIDAE)
- athena, Pachydiscus athena (C.J. Maury 1930 †) - (DESMOCERATIDAE) (FOSSIL)
- athena, Vaugonia athena Poulton & P. Callomon, 1977 † - (MYOPHORELLIDAE) (FOSSIL)
- athenae, Rolaniconus athenae (R.M. Filmer, 2011) - (CONIDAE)
- athenarum, Cochlostoma hellenicum athenarum (A.de Saint-Simon, 1869) - (COCHLOSTOMATIDAE)
- athenasi, Murex athenasi Vasseur, 1881 † - (MURICIDAE) (FOSSIL)
- athenasi, Potamides athenasi (Vasseur, 1881 †) - (POTAMIDIDAE) (FOSSIL)
- athenasi, Trochus athenasi Vasseur, 1881 † - (TROCHIDAE) (FOSSIL)
- athenia, Oliva athenia P.L. Duclos, 1835 - (OLIVIDAE)
- athenia, Oliva athenia R.F. Zeigler & H.C. Porreca, 1969 - syn of: Oliva mucronata F.P. Marrat, 1871 - (OLIVIDAE)
- athenius, Dolomena variabilis athenius (P.L. Duclos, 1844) - (STROMBIDAE)
- athensis, Mastus athensis (L. Pfeiffer, 1847) - (ENIDAE)
- athensis jaczewskii, Mastus athensis jaczewskii (A.J. Wagner, 1928) - (ENIDAE)
- athera, Falsicingula athera A.N. Golikov & O.A. Scarlato, 1967 - (FALSICINGULIDAE)
- atherstonei, Ostrea atherstonei R.B. Newton, 1913 - (OSTREIDAE)
- atherstoni, Olcostephanus atherstoni (Sharpe, 1856 †) - (OLCOSTEPHANIDAE) (FOSSIL)
- athesina, Campylaea athesina M. Paulucci, 1881 - syn of: Cingulifera cingulatum baldense (E.A. Rossmässler, 1839) - (HELICIDAE)
- athesina, Vertigo athesina P.V. Gredler, 1856 - syn of: Isthmia pygmaea (J.P.R. Draparnaud, 1801) - (VERTIGINIDAE)
- athiadica, Corymbina rhodensis athiadica Bukowski, 1892 † - (LYMNAEIDAE) (FOSSIL)
- athiensis, Cleopatra athiensis B. Verdcourt, 1957 - (PALUDOMIDAE)
- athleenae, Anticlimax athleenae (H.A. Pilsbry & J.T.L. McGinty, 1946) - (TORNIDAE)
- Athleenia, syn of: Genus Oceanida L. de Folin, 1870 (EULIMIDAE)
- athleta, Peltoceras athleta (B. Phillips, 1829 †) - (ASPIDOCERATIDAE) (FOSSIL)
- athleta, Projovellania athleta (Barrande †) - (JOVELLANIIDAE) (FOSSIL)
- athleta, Athlopecten athleta (C.A. von Zittel, 1865 †) - (PECTINIDAE) (FOSSIL)
- athleta, Amplogladius athleta (A.V.M.D. D'Orbigny, 1850 †) - (ROSTELLARIIDAE) (FOSSIL)
- athleta, Lirophora athleta T.A. Conrad, 1863 - syn of: Lirophora latilirata (T.A. Conrad, 1841) - (VENERIDAE)
- Athleta, Genus Athleta T.A. Conrad, 1853 (VOLUTIDAE)
- athleta, Volutospina athleta (D.C. Solander in G. Brander, 1877 †) - (VOLUTIDAE) (FOSSIL)
- athleta baylei, Peltoceras athleta baylei Prieser, 1937 † - syn of: Metapeltoceras baylei Prieser, 1937 † - (ASPIDOCERATIDAE) (FOSSIL)
- athletica, Patella ulyssiponensis athletica W.I. Bean, 1844 - (PATELLIDAE)
- athleticum, Dactylioceras athleticum C.T. Simpson, 1855 † - (DACTYLIOCERATIDAE) (FOSSIL)
- athlia, Bruceiella athlia A. Warén & P. Bouchet, 2001 - (SKENEIDAE)
- Athlopecten, Genus Athlopecten Marwick, 1928 (PECTINIDAE) (FOSSIL)
- ATHORACOPHORIDAE P. Fischer, 1883 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-ATHORACOPHOROIDEA [Superfamily])
- Athoracophorus, Genus Athoracophorus A. Gould, 1852 (ATHORACOPHORIDAE)
- athrix, Chloritis athrix (O.F. von Möllendorff, 1901) - (CAMAENIDAE)
- athrix, Polytoxon athrix (H.R. Simroth, 1896) - (UROCYCLIDAE)
- athroa, Anadara athroa W.P. Woodring, 1973 † - (ARCIDAE) (FOSSIL)
- athroa, Tellina athroa E. Ravenel, 1885 - syn of: Serratina aequistriata (T. Say, 1824) - (TELLINIDAE)
- athulia, Dicroloma athulia (A.V.M.D. D'Orbigny, 1850 †) - (APORRHAIDAE) (FOSSIL)
- athulia, Pterocera athulia A.V.M.D. D'Orbigny, 1850 † - syn of: Dicroloma athulia (A.V.M.D. D'Orbigny, 1850 †) - (STROMBIDAE) (FOSSIL)
- athyrma, Drillia athyrma J.C. Melvill & R. Standen, 1901 - (DRILLIIDAE)
- atiaia, Manganesepta atiaia L.R.L. Simone & C.M. Cunha, 2014 - (FISSURELLIDAE)
- atiensis, Sinployea atiensis (W.H. Pease, 1870) - (CHAROPIDAE)
- Atilia, Subgenus Mitrella (Atilia) Adams & Adams, 1853 (COLUMBELLIDAE) (FOSSIL)
- Atilia, syn of: Genus Anachis H. Adams & A. Adams, 1953 (COLUMBELLIDAE)
- Atiliosa, syn of: Genus Attiliosa W.K. Emerson, 1968 (MURICIDAE)
- atilis, Gillia atilis I. Lea, 1841 - syn of: Gillia altilis (I. Lea, 1841) - (LITHOGLYPHIDAE)
- atilis, Partula atilis D.M. Crampton, 1956 - (PARTULIDAE)
- atimovatae, Ancilla atimovatae Y.I. Kantor, A.E. Fedosov & al., 2016 - (ANCILLARIIDAE)
- atimovatae, Clathropsis atimovatae A. Cecalupo & I. Perugia, 2014 - (CERITHIOPSIDAE)
- atimovatae, Pionoconus atimovatae L. Bozzetti, 2012 - (CONIDAE)
- Atira, Genus Atira Stewart, 1926 (TROCHIDAE) (FOSSIL)
- atjehensis, Turricula tornata atjehensis C.H. Oostingh, 1938 - (CLAVATULIDAE)
- atjehensis, Nebularia atjehensis C.H. Oostingh, 1939 - (MITRIDAE)
- atkaensis, Ladislavella atkaensis (W.H. Dall, 1884) - (LYMNAEIDAE)
- atkana, Littorina sitkana atkana W.H. Dall, 1902 - (LITTORINIDAE)
- atkinsi, Chondrothyrium violaceum atkinsi C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- atkinsi, Torrecoptis atkinsi (C. de la Torre & W.J. Clench, 1930) - (UROCOPTIDAE)
- Atkinsonella, Genus Atkinsonella Finlay, 1930 (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- atkinsoni, Solatisonax atkinsoni (E.A. Smith, 1891) - (ARCHITECTONICIDAE)
- atkinsoni, Cardita atkinsoni J.E. Tenison-Woods, 1876 - syn of: Purpurocardia bimaculata (G.P. Deshayes, 1854) - (CARDITIDAE)
- atkinsoni, Etrema atkinsoni J.E. Tenison-Woods, 1876 - syn of: Etrema denseplicata (R.W. Dunker, 1871) - (CLATHURELLIDAE)
- atkinsoni, Anachis atkinsoni (J.E. Tenison-Woods, 1876) - (COLUMBELLIDAE)
- atkinsoni, Ovacuna atkinsoni (J.E. Tenison-Woods, 1877) - (CONDYLOCARDIIDAE)
- atkinsoni, Cylichna atkinsoni J.E. Tenison-Woods, 1876 - syn of: Retusa atkinsoni (J.E. Tenison-Woods, 1876) - (CYLICHNIDAE)
- atkinsoni, Helix atkinsoni C.M.D.E. Legrand, 1871 - syn of: Thryasona diemenensis (J.C. Cox, 1868) - (HELICIDAE)
- atkinsoni, Ischnochiton variegatus atkinsoni T. Iredale & W.L. May, 1916 - (ISCHNOCHITONIDAE)
- atkinsoni, Kellia atkinsoni J.E. Tenison-Woods, 1877 - syn of: Ovacuna atkinsoni (J.E. Tenison-Woods, 1877) - (KELLIIDAE)
- atkinsoni, Mangelia atkinsoni J.E. Tenison-Woods, 1876 - syn of: Anachis atkinsoni (J.E. Tenison-Woods, 1876) - (MANGELIIDAE)
- atkinsoni, Marginella atkinsoni (W.L. May, 1922 †) - (MARGINELLIDAE) (FOSSIL)
- atkinsoni, Pronucula atkinsoni (Johnston, 1880 †) - (NUCULIDAE) (FOSSIL)
- atkinsoni, Gyraulus atkinsoni (G. Johnston, 1879) - (PLANORBIDAE)
- atkinsoni, Propeamussium atkinsoni (Johnston, 1880 †) - (PROPEAMUSSIIDAE) (FOSSIL)
- atkinsoni, Retusa atkinsoni (J.E. Tenison-Woods, 1876) - (RETUSIDAE)
- atkinsoni, Lucidestea atkinsoni (J.E. Tenison-Woods, 1876) - (RISSOIDAE)
- atkinsoni, Sukashitrochus atkinsoni (J.E. Tenison-Woods, 1877) - (SCISSURELLIDAE)
- atkinsoni, Scissurella atkinsoni J.E. Tenison-Woods, 1877 - syn of: Sukashitrochus atkinsoni (J.E. Tenison-Woods, 1877) - (SCISSURELLIDAE)
- atkinsoni, Colpospira atkinsoni R. Tate & W.L. May, 1900 - (TURRITELLIDAE)
- atkinsoni, Ericusa atkinsoni (G.B. Pritchard, 1896 †) - (VOLUTIDAE) (FOSSIL)
- atkinsoni medioangulata, Turritella atkinsoni medioangulata J.C. Verco, 1910 - syn of: Colpospira atkinsoni R. Tate & W.L. May, 1900 - (TURRITELLIDAE)
- atkinsonianum, Pisidium atkinsonianum W. Theobald, 1876 - (SPHAERIIDAE)
- atkinsonorum, Okenia atkinsonorum W.B. Rudman, 2007 - (GONIODORIDIDAE)
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