- scylla, Vermiceras scylla (Reynès, 1879 †) - (ARIETITIDAE) (FOSSIL)
- scylla, Triphora scylla Fernandes & A. Pimenta, 2015 - (TRIPHORIDAE)
- scylla stoweyense, Vermiceras scylla stoweyense D.T. Donovan, 1952 † - (ARIETITIDAE) (FOSSIL)
- Scyllaea, Genus Scyllaea C. Linnaeus, 1758 (SCYLLAEIDAE)
- SCYLLAEIDAE Alder & Hancock, 1855 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-NUDIBRANCHIA [Order]-TRITONIOIDEA [Superfamily])
- Scymnia, syn of: Genus Simnia A. Risso, 1826 (OVULIDAE)
- scymnocelata, Boonea scymnocelata A. Pimenta, R.S. Absalão & M. Miyaji, 2009 - (PYRAMIDELLIDAE)
- Scyphoceras, Genus Scyphoceras Ruzhentsev & Shimanskiy, 1954 (SCYPHOCERATIDAE) (FOSSIL)
- SCYPHOCERATIDAE Ruzhentsev & Shimanskiy, 1954 - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-NAUTILIDA [Order]-AIPOCERATOIDEA [Superfamily]) (FOSSIL)
- Scyphoconcha, Genus Scyphoconcha Liu & Gu, 1989 (NUCULIDA (UNASSIGNED)) (FOSSIL)
- Scyphomya, syn of: Genus Jouannetia C. des Moulins, 1828 (PHOLADIDAE)
- scyphophilla, Saccostrea scyphophilla (F. Péron & C.A. Lesueur, 1807) - (OSTREIDAE)
- scyphophilla, Ostrea scyphophilla F. Péron & C.A. Lesueur, 1807 - syn of: Saccostrea scyphophilla (F. Péron & C.A. Lesueur, 1807) - (OSTREIDAE)
- scyphus, Schileykula scyphus (L. Pfeiffer, 1848) - (ORCULIDAE)
- scyphus, Orculella scyphus O. Böttger, 1905 - syn of: Orculella bulgarica (P. Hesse, 1915) - (ORCULIDAE)
- Scyphus, syn of: Genus Orcula F. Held, 1837 (ORCULIDAE)
- scyphus enteroplax, Schileykula scyphus enteroplax (H.A. Pilsbry, 1922) - (ORCULIDAE)
- scyphus erecta, Schileykula scyphus erecta B. Hausdorf, 1996 - (ORCULIDAE)
- scyphus ruderalis, Orculella scyphus ruderalis N.N. Akramowski, 1947 - syn of: Orculella ruderalis (N.N. Akramowski, 1947) - (ORCULIDAE)
- scytalis, Astarte scytalis Holdhaus, 1913 † - syn of: Eoseebachia sowerbyana (Holdhaus, 1913 †) - (ASTARTIDAE) (FOSSIL)
- Scythemtolium, syn of: Genus Scythentolium Allasinaz, 1972 (ENTOLIIDAE) (FOSSIL)
- Scythentolium, Genus Scythentolium Allasinaz, 1972 (ENTOLIIDAE) (FOSSIL)
- scythica, Towapteria scythica (Wirth, 1936 †) - (BAKEVELLIIDAE) (FOSSIL)
- scythica, Fruticicola scythica (C.A. Westerlund, 1898) - (BRADYBAENIDAE)
- scythica, Oligolimax scythica J. Pusanow, 1925 - syn of: Phenacolimax annularis (S.E. Studer, 1820) - (VITRINIDAE)
- scythicum, Oxytoma scythicum Wirth, 1936 † - syn of: Towapteria scythica (Wirth, 1936 †) - (OXYTOMIDAE) (FOSSIL)
- scythicum, Oraniceras scythicum Mitta, 2015 † - (PARKINSONIIDAE) (FOSSIL)
- scythicus, Virgatosphinctes scythicus (Vischniakoff, 1882 †) - (PERISPHINCTIDAE) (FOSSIL)
- scytodes, Aeropictus scytodes L. Pfeiffer, 1853 - syn of: Aeropictus veranyi (L. Pfeiffer, 1848) - (AMPHIBULIMIDAE)
- scytodes, Bulimus scytodes L. Pfeiffer, 1853 - syn of: Aeropictus veranyi (L. Pfeiffer, 1848) - (BULIMULIDAE)
- scytodesma, Callochiton scytodesma A. Scacchi, 1836 - syn of: Callochiton septemvalvis (G. Montagu, 1803) - (CALLOCHITONIDAE)
- scytodesma, Chiton scytodesma A. Scacchi, 1836 - syn of: Callochiton septemvalvis (G. Montagu, 1803) - (CHITONIDAE)
- seabeensis, Pecten seabeensis H.G. Richards, 1947 † - (PECTINIDAE) (FOSSIL)
- seabeensis, Otoscaphites seabeensis Cobban & Gryc, 1961 † - (SCAPHITIDAE) (FOSSIL)
- seafieldensis, Sphaerucaprina seafieldensis Chubb, 1971 † - (CAPRINIDAE) (FOSSIL)
- seaforthensis, Orthaulax seaforthensis C.T. Trechmann, 1941 † - (STROMBIDAE) (FOSSIL)
- sealei, Austiniceras sealei Spath, 1922 † - syn of: Kitchinites spathi Henderson & McNamara, 1985 † - (DESMOCERATIDAE) (FOSSIL)
- sealei, Turbonilla sealei A.M. Strong & L.G. Hertlein, 1939 - (PYRAMIDELLIDAE)
- sealswoodi, Caecum sealswoodi P.P. Carpenter, 1859 - syn of: Caecum searleswoodii P.P. Carpenter, 1859 - (CAECIDAE)
- sealyi, Pecten sealyi H.G. Richards, 1947 † - (PECTINIDAE) (FOSSIL)
- seamani, Pennoceras seamani Miller & Unklesbay, 1942 † - (WIEDEYOCERATIDAE) (FOSSIL)
- seamountensis, Parviturbo seamountensis F. Rubio, E. Rolán & S. Gofas, 2015 - (SKENEIDAE)
- seamounti, Chrysallida seamounti A. Peñas & E. Rolán, 1999 - (PYRAMIDELLIDAE)
- seani, Neritina seani B.M. Landau, F. Da Silva & S.M. Heitz, 2016 † - (NERITIDAE) (FOSSIL)
- seanlandaui, Alvania seanlandaui Landau, Marquet & Grigis, 2003 † - (RISSOIDAE) (FOSSIL)
- Searlesia, Genus Searlesia Harmer, 1914 (BUCCINIDAE) (FOSSIL)
- searleswoodii, Caecum searleswoodii P.P. Carpenter, 1859 - (CAECIDAE)
- seasea, Fluviopupa seasea M. Haase, W.F. Ponder & P. Bouchet, 2006 - (HYDROBIIDAE)
- seatownensis, Passaloteuthis seatownensis H.G. Lang, 1928 † - (PASSALOTEUTHIDIDAE) (FOSSIL)
- seattlensis, Bruclarkia seattlensis J.W. Durham, 1944 † - (BUCCINIDAE) (FOSSIL)
- sebacea, Trochomorpha sebacea L. Pfeiffer, 1856 - (TROCHOMORPHIDAE)
- Sebadoris, Genus Sebadoris E.G.G. Marcus & E.A. du B. Marcus, 1960 (DISCODORIDIDAE)
- sebae, Argonauta sebae T.A. de M. Monterosato, 1914 - syn of: Argonauta argo C. Linnaeus, 1758 - (ARGONAUTIDAE)
- sebae, Donax sebae A. Cecalupo, G. Buzzurro & M. Mariani, 2008 - (DONACIDAE)
- sebae, Mammilla sebae (C.A. Récluz, 1844) - (NATICIDAE)
- sebae, Polinices sebae C.A. Récluz, 1844 - syn of: Mammilla sebae (C.A. Récluz, 1844) - (NATICIDAE)
- sebae, Lambis truncata sebae (L.C. Kiener, 1843) - (STROMBIDAE)
- sebalis, Amiantofusus sebalis K. Fraussen, Y.I. Kantor & R. Hadorn, 2007 - (FASCIOLARIIDAE)
- sebasmia, Burtoa sebasmia J.R. Bourguignat, 1889 - (ACHATINIDAE)
- sebastanae, Unio sebastanae C.T. Simpson, 1900 - syn of: Diplodon rhuacoicus (A.V.M.D. D'Orbigny, 1835) - (UNIONIDAE)
- sebastiana, Lysinoe sebastiana (W.H. Dall, 1897) - (XANTHONYCHIDAE)
- sebastiani, Gibberula sebastiani L. Bozzetti, 1997 - (CYSTISCIDAE)
- sebastiani, Nanuca sebastiani Er. Marcus, 1957 - (FACELINIDAE)
- sebastiani, Marginella sebastiani I. Marche-Marchad & J. Rosso, 1979 - (MARGINELLIDAE)
- sebastiani, Taramelliceras sebastiani Quéreilhac, 2009 † - (OPPELIIDAE) (FOSSIL)
- sebastiani, Turbonilla sebastiani P. Bartsch, 1917 - (PYRAMIDELLIDAE)
- sebastiani, Unio sebastiani F. Haas, 1930 - syn of: Rhipidodonta charruana (A.V.M.D. D'Orbigny, 1835) - (UNIONIDAE)
- sebastianoi, Synthopsis sebastianoi A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- sebastianoi, Notolimea sebastianoi A. Cecalupo, 1995 - syn of: Limea clandestina (C. Salas, 1994) - (LIMIDAE)
- sebastieni, Volvarina sebastieni J. Espinosa & J.A. Ortea, 2012 - (MARGINELLIDAE)
- sebedinus, Tirolonautilus sebedinus (Stache, 1877 †) - (TAINOCERATIDAE) (FOSSIL)
- sebethiana, Bithynia sebethiana H. Blanc, 1881 - syn of: Bithynia tentaculata (C. Linnaeus, 1758) - (BITHYNIIDAE)
- sebetia, Bornia sebetia (A. da Costa, 1830) - (KELLIIDAE)
- sebetia, Sphaerium sebetia A. da Costa, 1830 - syn of: Bornia sebetia (A. da Costa, 1830) - (SPHAERIIDAE)
- sebetia triangula, Bornia sebetia triangula P.M. Pallary, 1920 - syn of: Bornia sebetia (A. da Costa, 1830) - (KELLIIDAE)
- sebinensis, Helix sebinensis W. Kobelt, 1875 - syn of: Chilostoma adelozona (P. von Ströbel, 1857) - (HELICIDAE)
- sebinensis, Anodonta sebinensis H. Drouët, 1883 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- sebouensis, Rupestrella dupotetii sebouensis D.T. Holyoak & M. Seddon, 1986 - (CHONDRINIDAE)
- sebyanicus, Somoholites sebyanicus Kutygin, 1999 † - (SOMOHOLITIDAE) (FOSSIL)
- sebyi, Tubercliopsis sebyi A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- secaduilabris, Corbicula secaduilabris B. Prashad, 1928 - syn of: Corbicula striatella G.P. Deshayes, 1854 - (CYRENIDAE)
- secale, Acteon secale A.A. Gould, 1859 - (ACTEONIDAE)
- secale, Abida secale (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- secale, Cylindrobullina secale (Terquem, 1855 †) - (CYLINDROBULLINIDAE) (FOSSIL)
- secale, Ovula secale G.B. I Sowerby, 1828 - syn of: Simnia spelta (C. Linnaeus, 1758) - (OVULIDAE)
- secale, Cymbovula secale L.W. Dillwyn, 1817 - syn of: Cymbovula acicularis (J.B.P.A. Lamarck, 1811) - (OVULIDAE)
- secale affinis, Abida secale affinis E.A. Rossmässler, 1839 - (CHONDRINIDAE)
- secale andorrensis, Abida secale andorrensis J.R. Bourguignat, 1863 - (CHONDRINIDAE)
- secale bofilli, Abida secale bofilli P. Fagot, 1884 - (CHONDRINIDAE)
- secale boileausiana, Abida secale boileausiana (H.C. Küster, 1845) - (CHONDRINIDAE)
- secale brauniopsis, Abida secale brauniopsis C. Altimira, 1963 - (CHONDRINIDAE)
- secale brongersmai, Abida secale brongersmai E. Gittenberger, 1973 - (CHONDRINIDAE)
- secale cadica, Abida secale cadica C.A. Westerlund, 1902 - (CHONDRINIDAE)
- secale cadiensis, Abida secale cadiensis E. Gittenberger, 1973 - (CHONDRINIDAE)
- secale elegantissima, Abida secale elegantissima E. Gittenberger, 1973 - (CHONDRINIDAE)
- secale ionicae, Abida secale ionicae B. Kokshoorn & E. Gittenberger, 2010 - (CHONDRINIDAE)
- secale leucadia, Abida secale leucadia E. Gittenberger, 1973 - (CHONDRINIDAE)
- secale lilietensis, Abida secale lilietensis A. Bofill, 1886 - (CHONDRINIDAE)
- secale margaridae, Abida secale margaridae L.A. Beck, 1988 - (CHONDRINIDAE)
- secale meridionalis, Abida secale meridionalis A. Martínez-Ortí, B. Gómez & G. Faci, 2004 - (CHONDRINIDAE)
- secale merijni, Abida secale merijni B. Kokshoorn & E. Gittenberger, 2010 - (CHONDRINIDAE)
- secale petersi, Abida secale petersi B. Kokshoorn & E. Gittenberger, 2010 - (CHONDRINIDAE)
- secale saxicola, Abida secale saxicola (A. Moquin-Tandon, 1843) - (CHONDRINIDAE)
- secale tuxensis, Abida secale tuxensis (C.A. Westerlund, 1902) - (CHONDRINIDAE)
- secale vilellai, Abida secale vilellai B. Kokshoorn & E. Gittenberger, 2010 - (CHONDRINIDAE)
- secaliformis, Abida secaliformis C. Chatenier, 1888 - syn of: Abida secale (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- secalina, Abida secalina É.A.A. Locard, 1894 - syn of: Abida secale (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- secalina, Cilara secalina (R.A. Philippi, 1846) - (COLUMBELLIDAE)
- secalina, Thala secalina (A.A. Gould, 1860) - (COSTELLARIIDAE)
- secalina, Cylichna secalina Shumard, 1861 † - (CYLICHNIDAE) (FOSSIL)
- secalina, Sandbergeria secalina R.A. Philippi, 1843 † - syn of: Sandbergeria turrita (J.P.S. Grateloup, 1828 †) - (DIASTOMATIDAE) (FOSSIL)
- secalina, Haedropleura secalina (R.A. Philippi, 1844) - (HORAICLAVIDAE)
- secalina, Volvarina secalina R.A. Philippi, 1844 - syn of: Volvarina mitrella (A. Risso, 1826) - (MARGINELLIDAE)
- secalina, Melania secalina R.A. Philippi, 1843 † - syn of: Sandbergeria turrita (J.P.S. Grateloup, 1828 †) - (THIARIDAE) (FOSSIL)
- secalina bizonata, Volvarina secalina bizonata H.C. Weinkauff, 1880 - syn of: Volvarina mitrella (A. Risso, 1826) - (MARGINELLIDAE)
- secalina maibulaki, Ena secalina maibulaki Skvortsov, 1940 - syn of: Pseudonapaeus secalinus (E.C. Von Martens, 1881) - (ENIDAE)
- secalinum, Buccinum secalinum R.A. Philippi, 1846 - syn of: Cilara secalina (R.A. Philippi, 1846) - (BUCCINIDAE)
- secalinum, Aliculastrum secalinum (A. Adams, 1862) - (HAMINOEIDAE)
- secalinum, Haedropleura secalinum R.A. Philippi, 1844 - syn of: Haedropleura septangularis (G. Montagu, 1803) - (HORAICLAVIDAE)
- secalinum, Pleurotoma secalinum R.A. Philippi, 1844 - syn of: Haedropleura secalina (R.A. Philippi, 1844) - (TURRIDAE)
- secalinus, Pseudonapaeus secalinus (E.C. Von Martens, 1881) - (ENIDAE)
- secalis, Sandbergeria secalis G.P. Deshayes, 1864 † - (DIASTOMATIDAE) (FOSSIL)
- secalis, Agathotoma secalis D.R. Shasky, 1971 - (MANGELIIDAE)
- secana, Tudora secana H.B. Baker, 1923 - (POMATIIDAE)
- secans, Kalidos secans E. Fischer-Piette, F. Blanc & F. Salvat, 1975 - (ARIOPHANTIDAE)
- secans, Metassiminea philippinica secans (O. Böttger, 1887) - (ASSIMINEIDAE)
- secans, Papuina secans C. Hedley, 1894 - (CAMAENIDAE)
- secans, Tropidophora secans E. Fischer-Piette, 1949 - (POMATIIDAE)
- secans, Temnodiscus secans E.F.R.K. Koken, 1897 † - (TROPIDODISCIDAE) (FOSSIL)
- secans, Turritella secans A.E.M. Cossmann & M.A. Peyrot, 1921 † - (TURRITELLIDAE) (FOSSIL)
- secatum, Onchidium secatum J.R.C. Quoy & J.P. Gaimard, 1824 - (ONCHIDIIDAE)
- seccato, Ovula seccato G.B. I Sowerby, 1834 - syn of: Cyphoma intermedium (G.B. I Sowerby, 1828) - (OVULIDAE)
- seccombei, Lugubrilaria seccombei W.G. Lyons, 2012 - (FASCIOLARIIDAE)
- seccombei, Marginella seccombei A. Wakefield, 2012 - (MARGINELLIDAE)
- secernenda, Anadara secernenda (É. Lamy, 1907) - (ARCIDAE)
- secernenda, Haliotis secernenda T.A. de M. Monterosato - syn of: Haliotis tuberculata lamellosa J.B.P.A. Lamarck, 1822 - (HALIOTIDAE)
- secernenda, Helix secernenda E.A. Rossmässler, 1837 - (HELICIDAE)
- secernenda, Patella vulgata secernenda C. Linnaeus, 1758 - (PATELLIDAE)
- secernenda, Turbonilla secernenda P. Dautzenberg, 1912 - (PYRAMIDELLIDAE)
- secernenda, Cingulina secernenda J.C. Melvill, 1918 - (PYRAMIDELLIDAE)
- secernendum, Lytoceras secernendum (C. De Stefani, 1887 †) - (LYTOCERATIDAE) (FOSSIL)
- secernendus, Cenoceras secernendus (Pia, 1914 †) - (CENOCERATIDAE) (FOSSIL)
- secernendus, Nautilus secernendus Pia, 1914 † - syn of: Cenoceras secernendus (Pia, 1914 †) - (NAUTILIDAE) (FOSSIL)
- secernendus, Oxychilus secernendus O. von Retowski, 1889 - (OXYCHILIDAE)
- secernendus, Pecten secernendus C.M. Tapparone-Canefri, 1874 - syn of: Mimachlamys crassicostata (G.B. II Sowerby, 1842) - (PECTINIDAE)
- secessa, Cyclomorpha secessa P. Bouchet & A. Abdou, 2003 - (ASSIMINEIDAE)
- secessa, Cernuella secessa C. Pollonera, 1892 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- sechellensis, Divaricella sechellensis D'Orbigny, 1846 - syn of: Divaricella seychellensis (A.V.M.D. D'Orbigny, 1846) - (LUCINIDAE)
- sechuenensis, Anadenus sechuenensis W.E. Collinge, 1899 - (ANADENIDAE)
- sechuntana, Chionopsis sechuntana (G.D. Hanna & Israelsky, 1925 †) - (VENERIDAE) (FOSSIL)
- sechura, Aligena sechura (A.A. Olsson, 1961) - (LASAEIDAE)
- sechurana, Anadara sechurana A.A. Olsson, 1932 † - (ARCIDAE) (FOSSIL)
- sechurana, Felimare sechurana Hoover, Padula, Schrödl, Hooker & Valdés, 2017 - (CHROMODORIDIDAE)
- sechuranum, Entodesma sechuranum H.A. Pilsbry & A.A. Olsson, 1935 - (LYONSIIDAE)
- Sechurina, Genus Sechurina Olsson, 1944 (CARDIIDA (UNASSIGNED)) (FOSSIL)
- seclusa, Microcystina seclusa H.H. Godwin-Austen, 1891 - (ARIOPHANTIDAE)
- seclusa, Nassa seclusa P. Fischer, 1891 - syn of: Nassarius livescens (R.A. Philippi, 1849) - (NASSARIIDAE)
- seclusus, Nassarius seclusus Fischer, 1891 † - (NASSARIIDAE) (FOSSIL)
- secluza, Nassa secluza P. Fischer, 1891 - syn of: Nassarius livescens (R.A. Philippi, 1849) - (NASSARIIDAE)
- secluzus, Nassarius secluzus P. Fischer, 1891 - syn of: Nassarius livescens (R.A. Philippi, 1849) - (NASSARIIDAE)
- secoense, Bostrychoceras secoense A.T. Young, 1963 † - syn of: Bostrychoceras polyplocum (F.A. Roemer, 1841 †) - (NOSTOCERATIDAE) (FOSSIL)
- secreta, Asperarca secreta R. La Perna, 1998 - (ARCIDAE)
- secreta, Gibberula secreta T.A. de M. Monterosato, 1889 - (CYSTISCIDAE)
- secreta, Mangelia secreta (J.J. Van Aartsen & M.C. Fehr-de Wal, 1978) - (MANGELIIDAE)
- secreta, Pallifera secreta T.D.A. Cockerell, 1900 - (PHILOMYCIDAE)
- secreta, Vitrea secreta É.A.A. Locard, 1882 - syn of: Subrimatus narbonensis (S. Clessin, 1877) - (PRISTILOMATIDAE)
- secretum, Opisthostoma secretum W.J.M. Maassen, 2002 - (DIPLOMMATINIDAE)
- secretum, Tenuitheoceras secretum M.A. Frey & al., 2014 † - (ORTHOCERATIDAE) (FOSSIL)
- secretum, Parayakutoceras secretum A.M. Popov, 1970 † - (ORULGANITIDAE) (FOSSIL)
- secretus, Vitrea secretus J.R. Bourguignat, 1880 - syn of: Vitrea crystallina (O.F. Müller, 1774) - (PRISTILOMATIDAE)
- secretus, Stenoglaphyrites secretus Ruzhentsev & Bogoslovskaya, 1971 † - (STENOGLAPHYRITIDAE) (FOSSIL)
- secta, Defrancia secta G.B. II Sowerby, 1870 - syn of: Tritonoturris scalaris (R.B. Hinds, 1843) - (CLATHURELLIDAE)
- secta, Graptacme secta (G.P. Deshayes, 1825) - (DENTALIIDAE)
- secta, Neverita secta W.M. Gabb, 1864 - syn of: Neverita reclusiana (G.P. Deshayes, 1839) - (NATICIDAE)
- secta, Asmunda secta (E. Saurin, 1958) - (PYRAMIDELLIDAE)
- secta, Asmunda secta E. Saurin, 1958 - syn of: Asmunda secta (E. Saurin, 1958) - (PYRAMIDELLIDAE)
- secta, Macoma secta (T.A. Conrad, 1837) - (TELLINIDAE)
- secta, Tellina secta T.A. Conrad, 1837 - syn of: Macoma secta (T.A. Conrad, 1837) - (TELLINIDAE)
- secta edulis, Macoma secta edulis P.P. Carpenter, 1860 - syn of: Macoma secta (T.A. Conrad, 1837) - (TELLINIDAE)
- Sectiarca, syn of: Genus Anadara J.E. Gray, 1847 (ARCIDAE)
- secticosta, Glycymeris secticosta L.A. Reeve † - (GLYCYMERIDIDAE) (FOSSIL)
- secticosta schenki, Glycymeris secticosta schenki D. Nicol † - (GLYCYMERIDIDAE) (FOSSIL)
- secticostata, Anadara tuberculosa secticostata (L.A. Reeve, 1844) - (ARCIDAE)
- sectiforme, Graptacme sectiforme R. Tate, 1899 † - (DENTALIIDAE) (FOSSIL)
- sectilabris, Cyclodontina sectilabris L. Pfeiffer, 1850 - (ODONTOSTOMIDAE)
- sectilabrum, Schistoloma sectilabrum (A.A. Gould, 1844) - (PUPINIDAE)
- sectilis, Minycardita sectilis Hoare & Plas, 2003 † - (CONOCARDIIDAE) (FOSSIL)
- Sectilumen, Genus Sectilumen H.A. Pilsbry & E.G. Vanatta, 1898 (UROCOPTIDAE)
- sectior, Macoma sectior (K. Oyama, 1950) - (TELLINIDAE)
- sectior, Rexithaerus sectior K. Oyama, 1950 - syn of: Macoma sectior (K. Oyama, 1950) - (TELLINIDAE)
- sectior, Macoma sectior T.A. Conrad, 1837 - syn of: Macoma secta (T.A. Conrad, 1837) - (TELLINIDAE)
- Sectipecten, Genus Sectipecten Marwick, 1928 (PECTINIDAE) (FOSSIL)
- sectis, Graptacme sectis G.P. Deshayes, 1825 - syn of: Graptacme secta (G.P. Deshayes, 1825) - (DENTALIIDAE)
- sectoris, Mactromeris sectoris Anderson & Martin, 1914 † - (MACTRIDAE) (FOSSIL)
- sectum, Dentalium sectum G.P. Deshayes, 1826 - syn of: Graptacme secta (G.P. Deshayes, 1825) - (DENTALIIDAE)
- sectus, Fusinus sectus (É.A.A. Locard, 1897) - (FASCIOLARIIDAE)
- sectus, Fusus sectus É.A.A. Locard, 1897 - syn of: Fusinus sectus (É.A.A. Locard, 1897) - (FASCIOLARIIDAE)
- sectus minor, Fusinus sectus minor F. Nordsieck, 1968 - (FASCIOLARIIDAE)
- secula, Campylites secula Spath, 1928 † - (OPPELIIDAE) (FOSSIL)
- secula, Endoplectoceras secula (Barrande, 1866 †) - (PHRAGMOCERATIDAE) (FOSSIL)
- secula, Trochoceras secula Barrande, 1866 † - syn of: Endoplectoceras secula (Barrande, 1866 †) - (RUTOCERATIDAE) (FOSSIL)
- secunda, Scalaronoba secunda A.W.B. Powell, 1940 - (ACLIDIDAE)
- secunda, Tropidorissoia secunda E. Rolán & J. Templado, 1994 - (BARLEEIIDAE)
- secunda, Palaearca secunda Salter † - (BIVALVIA INCERTAE SEDIS) (FOSSIL)
- secunda, Kokenospira secunda (Reed, 1906 †) - (BUCANIIDAE) (FOSSIL)
- secunda, Bulla secunda J.F. Mabille, 1896 - syn of: Bulla vernicosa A.A. Gould, 1859 - (BULLIDAE)
- secunda, Eoscobinella secunda A.G. Beu, 1970 † - (CONOIDEA (UNASSIGNED)) (FOSSIL)
- secunda, Amaea secunda J.T. Kuroda & K. Itô, 1961 - (EPITONIIDAE)
- secunda, Springvaleia secunda N.E. Weisbord, 1962 † - (EPITONIIDAE) (FOSSIL)
- secunda, Pelseneeria secunda (A.W.B. Powell, 1940) - (EULIMIDAE)
- secunda, Austrodrillia secunda A.W.B. Powell, 1965 - (HORAICLAVIDAE)
- secunda, Larochea secunda A.W.B. Powell, 1937 - (LAROCHEIDAE)
- secunda, Saxolucina proxima secunda (G.P. Deshayes, 1857 †) - (LUCINIDAE) (FOSSIL)
- secunda, Maorimorpha secunda A.W.B. Powell, 1942 - (MITROMORPHIDAE)
- secunda, Planktomya secunda (Monterosato in Sacco 1901) † - (MONTACUTIDAE) (FOSSIL)
- secunda, Homalocantha secunda (J.B.P.A. Lamarck, 1822) - (MURICIDAE)
- secunda, Bathyacmaea secunda T.A. Okutani, K. Fujikura & T. Sasaki, 1993 - (PECTINODONTIDAE)
- secunda, Tropidophora secunda E. Fischer-Piette & J. Bedoucha, 1965 - (POMATIIDAE)
- secunda, Lacrimiforma secunda (B. Wade, 1926 †) - (PYRAMIDELLIDAE) (FOSSIL)
- secunda, Nesiodostomia secunda (H.A. Pilsbry, 1917) - (PYRAMIDELLIDAE)
- secunda, Tropeas secunda E. Saurin, 1959 - syn of: Doliella nitens (J.G. Jeffreys, 1870) - (PYRAMIDELLIDAE)
- secunda, Colveraia secunda Lupu 1970 † - (RADIOLITIDAE) (FOSSIL)
- secunda, Rissoella secunda (T. Iredale, 1912) - (RISSOELLIDAE)
- secunda, Jeffreysiella secunda (T. Iredale, 1912) - syn of: Rissoella secunda (T. Iredale, 1912) - (RISSOELLIDAE)
- secunda, Spinulitheca secunda (A.V. Sysoev, 1968 †) - (SPINULITHECIDAE) (FOSSIL)
- secunda, Loxoglypta secunda (V. Bertin, 1878) - (TELLINIDAE)
- secunda, Temertassetia secunda D. Korn & al., 2010 † - (TEMERTASSETIIDAE) (FOSSIL)
- secunda, Venerella secunda (G.P. Deshayes, 1857 †) - (VENERIDAE) (FOSSIL)
- secunda, Megayoldia secunda W.H. Dall, 1916 - syn of: Megayoldia thraciaeformis (D.H. Storer, 1838) - (YOLDIIDAE)
- secunda, Yoldia secunda W.H. Dall, 1916 - syn of: Megayoldia thraciaeformis (D.H. Storer, 1838) - (YOLDIIDAE)
- secunda insolida, Venerella secunda insolida A.M. Keen, 1954 † - (VENERIDAE) (FOSSIL)
- secundum, Bisatoceras secundum Miller & Moore, 1938 † - (BISATOCERATIDAE) (FOSSIL)
- secundum, Conocardium secundum Barrande, 1881 † - (CONOCARDIIDAE) (FOSSIL)
- secundum, Glossaulax secundum (A. de Rochebrune & J.F. Mabille, 1885 †) - (NATICIDAE) (FOSSIL)
- secundum, Coenaculum secundum A.W.B. Powell, 1937 - (TOFANELLIDAE)
- secundus, Bucanopsis secundus Reed, 1906 † - syn of: Kokenospira secunda (Reed, 1906 †) - (BELLEROPHONTIDAE) (FOSSIL)
- secundus, Venustatrochus secundus A.W.B. Powell, 1958 - (CALLIOSTOMATIDAE)
- secundus, Potenatomus secundus (C.F. Laseron, 1951) - (CERITHIOPSIDAE)
- secundus, Venustilifer secundus A.W.B. Powell, 1940 - syn of: Pelseneeria secunda (A.W.B. Powell, 1940) - (EULIMIDAE)
- secundus, Polysphinctites secundus (Wetzel †) - (MORPHOCERATIDAE) (FOSSIL)
- secundus, Rugotyphis secundus P. Vella, 1961 † - (MURICIDAE) (FOSSIL)
- secundus, Cyclopecten secundus (H.J. Finlay, 1926) - (PROPEAMUSSIIDAE)
- secundus, Pseudodon secundus P.M. Heude, 1877 - (UNIONIDAE)
- secura, Turbonilla secura W.H. Dall & P. Bartsch, 1906 - (PYRAMIDELLIDAE)
- Securella, Subgenus Chione (Securella) Parker, 1949 (VENERIDAE) (FOSSIL)
- Securicauda, Genus Securicauda A.B. Leonard, L.F. Chichester, M.D. Richart & A.T. Young, 2011 (ARIONIDAE)
- securiclata, Moerella securiclata P.A. Maxwell, 1992 † - (TELLINIDAE) (FOSSIL)
- SECURICONIDAE - syn of Family: SCENELLIDAE (FOSSIL)
- Securiconus, Genus Securiconus Luo & al., 1982 (HELCIONELLIDAE) (FOSSIL)
- securicristatus, Oxydiscites securicristatus S. Elmi & C. Mangold † - (OPPELIIDAE) (FOSSIL)
- securicula, Nucula securicula Dufour, 1881 † - (NUCULIDAE) (FOSSIL)
- securiculata, Arca securiculata B. Wade, 1926 † - (ARCIDAE) (FOSSIL)
- securidens, Henslowiana securidens L.V. Krivosheina, 1978 - syn of: Pisidium henslowanum (R. Sheppard, 1825) - (SPHAERIIDAE)
- securifera, Rostellaria securifera E. Forbes, 1846 † - (ROSTELLARIIDAE) (FOSSIL)
- securiforme, Profulvia securiforme Slodkewitsch, 1938 † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- securiforme, Papyridea securiforme Slodkewitsch, 1938 † - syn of: Profulvia securiforme Slodkewitsch, 1938 † - (CARDIIDAE) (FOSSIL)
- securiforme, Conocardium securiforme (F.A. Roemer, 1855 †) - (CONOCARDIIDAE) (FOSSIL)
- securiforme, Salaputium securiforme (C. Hedley, 1902) - (CRASSATELLIDAE)
- securiforme, Choffaticeras securiforme Eck, 1909 † - (PSEUDOTISSOTIIDAE) (FOSSIL)
- securiformis, Gosseletia securiformis Follmann, 1885 † - syn of: Gosseletia triquetra (T.A. Conrad, 1838 †) - (AMBONYCHIIDAE) (FOSSIL)
- securiformis, Ammonites securiformis Simonovich, Batsevich & Sorokin, 1875 † - syn of: Colchidites securiformis (Simonovich, Batsevich & Sorokin, 1875 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- securiformis, Colchidites securiformis (Simonovich, Batsevich & Sorokin, 1875 †) - (ANCYLOCERATIDAE) (FOSSIL)
- securiformis, Cyrtodonta securiformis (Portlock) † - (CYRTODONTIDAE) (FOSSIL)
- securiformis, Cyrtodontula securiformis (Foerste, 1914 †) - (CYRTODONTIDAE) (FOSSIL)
- securiformis, Notomya securiformis F. McCoy, 1847 † - syn of: Pyramus myiformis J.B.M. Dana, 1847 † - (EDMONDIIDAE) (FOSSIL)
- securiformis, Bathymodiolus securiformis T.A. Okutani, K. Fujikura & T. Sasaki, 2004 - (MYTILIDAE)
- securiformis, Anodontoides securiformis McCoy † - (UNIONIDAE) (FOSSIL)
- securiformis, Anodon securiformis P.M. Heude, 1877 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- securiformis, Pitar securiformis T.A. Conrad, 1865 † - (VENERIDAE) (FOSSIL)
- securigera, Cypricardinia securigera Talent, 1963 † - (CYPRICARDINIIDAE) (FOSSIL)
- Securilla, Genus Securilla Drouλt, 1855 (ETHERIIDAE)
- Securilla, syn of: Genus Sphaerium J.A. Scopoli, 1777 (SPHAERIIDAE)
- securis, Limnoperna securis (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- securis, Limnoperna securis (J.B.P.A. Lamarck, 1819) - syn of: Limnoperna securis (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- securis, Nautilus securis Dittmar, 1866 † - syn of: Gonionautilus securus (Dittmar, 1866 †) - (NAUTILIDAE) (FOSSIL)
- securis, Sphaerium securis T. Prime, 1852 - (SPHAERIIDAE)
- securis, Unio securis I. Lea, 1829 - syn of: Ellipsaria lineolata C.S. Rafinesque, 1820 - (UNIONIDAE)
- securis, Unio securis G.P. Deshayes, 1830 - syn of: Ellipsaria lineolata C.S. Rafinesque, 1820 - (UNIONIDAE)
- securis, Securella securis (Shumard, 1858 †) - (VENERIDAE) (FOSSIL)
- securus, Pseudocatillus securus (Papaianopol, 1992 †) - (CARDIIDAE) (FOSSIL)
- securus, Gonionautilus securus (Dittmar, 1866 †) - (GONIONAUTILIDAE) (FOSSIL)
- securus, Sicradiscus securus (P.M. Heude, 1885) - (PLECTOPYLIDAE)
- securus, Schizodus securus (Shumard, 1859 †) - (SCHIZODIDAE) (FOSSIL)
- securus, Axinus securus Shumard, 1859 † - syn of: Schizodus securus (Shumard, 1859 †) - (THYASIRIDAE) (FOSSIL)
- Secusana, Genus Secusana Gredler, 1894 (CAMAENIDAE)
- Secusanus, Subgenus Pseudobuliminus (Secusanus) P.V. Gredler, 1894 (BRADYBAENIDAE)
- secutor, Conus secutor J.C.H. Crosse, 1865 - syn of: Ketyconus tinianus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- sedakovi, Anodonta sedakovi Siemaschko, 1847 - syn of: Anodonta anatina (C. Linnaeus, 1758) - (UNIONIDAE)
- sedaliensis, Bellerophon sedaliensis Miller & Gurley, 1896 † - (BELLEROPHONTIDAE) (FOSSIL)
- sedanensis, Architectonica sedanensis (K. Martin, 1905 †) - (ARCHITECTONICIDAE) (FOSSIL)
- sedanensis, Scapharca sedanensis K. Martin, 1910 † - (ARCIDAE) (FOSSIL)
- sedanensis, Conus sedanensis Martin, 1906 † - (CONIDAE) (FOSSIL)
- sedanensis, Nucula sedanensis Haanstra & Spiker, 1932 † - (NUCULIDAE) (FOSSIL)
- sedanensis, Pecten sedanensis Martin, 1909 † - (PECTINIDAE) (FOSSIL)
- sedanensis, Strombus sedanensis K. Martin, 1899 † - (STROMBIDAE) (FOSSIL)
- sedanensis, Turritella sedanensis Martin, 1905 † - (TURRITELLIDAE) (FOSSIL)
- seddonae, Cerithiopsis seddonae M. Jay & J. Drivas, 2002 - (CERITHIOPSIDAE)
- seddonae, Tanzartemon seddonae P. Tattersfield & B. Rowson, 2011 - (STREPTAXIDAE)
- sedea, Ostrea sedea T. Iredale, 1939 - syn of: Booneostrea subucula (F.P. Jousseaume in É. Lamy, 1925) - (OSTREIDAE)
- sedea setoensis, Ostrea sedea setoensis T. Habe, 1958 - syn of: Booneostrea subucula (F.P. Jousseaume in É. Lamy, 1925) - (OSTREIDAE)
- sedecimcostatum, Compressidentalium sedecimcostatum M. Boissevain, 1906 - syn of: Compressidentalium clathratum (E.C. Von Martens, 1881) - (DENTALIIDAE)
- sedecostatus, Dorsojugatus sedecostatus (A.V. Sysoev, 1962 †) - (DORSOJUGATIDAE) (FOSSIL)
- sedentaria, Mediterranea sedentaria J.R. Bourguignat, 1880 - syn of: Mediterranea hydatina (E.A. Rossmässler, 1838) - (OXYCHILIDAE)
- sedgewicki, Maclurina sedgewicki Longstaff, 1924 † - syn of: Maclurina sedgwicki Longstaff, 1924 † - (MACLURITIDAE) (FOSSIL)
- sedgvici, Ellobium sedgvici Phillips, 1829 † - (ELLOBIIDAE) (FOSSIL)
- sedgwichi, Murex sedgwichi O.G. Michelotti, 1847 † - (MURICIDAE) (FOSSIL)
- sedgwicii, Arcopagia sedgwicii (O.G. Michelotti †) - (TELLINIDAE) (FOSSIL)
- sedgwicki, Bothriembryon sedgwicki T. Iredale, 1939 - (BOTHRIEMBRYONTIDAE)
- sedgwicki, Loxoplocus sedgwicki J. Donald, 1906 † - (LOPHOSPIRIDAE) (FOSSIL)
- sedgwicki, Maclurina sedgwicki Longstaff, 1924 † - (MACLURITIDAE) (FOSSIL)
- sedgwicki, Astartila sedgwicki C.O. Waterhouse, 1987 † - (MEGADESMIDAE) (FOSSIL)
- sedgwicki, Hexaplex rudis sedgwicki O.G. Michelotti, 1847 - (MURICIDAE)
- sedgwicki, Sporadoceras sedgwicki Wedekind, 1908 - syn of: Maeneceras acutolaterale (C.L.F. von Sandberger, 1850 †) - (SPORADOCERATIDAE)
- sedgwicki, Trochus sedgwicki Münster, 1844 † - syn of: Eucycloidea tenuistria (Münster, 1844 †) - (TROCHIDAE) (FOSSIL)
- Sedgwickia, Genus Sedgwickia McCoy, 1844 (GRAMMYSIIDAE) (FOSSIL)
- sedgwickiana, Bakevellia sedgwickiana King, 1848 † † - syn of: Gervillia sedgwickiana (King, 1848 † †) - (BAKEVELLIIDAE) (FOSSIL)
- sedgwickiana, Gervillia sedgwickiana (King, 1848 † †) - (MYALINIDAE) (FOSSIL)
- sedgwickii, Architectonica sedgwickii Seeley † - (ARCHITECTONICIDAE) (FOSSIL)
- sedgwickii, Arctica sedgwickii (Walker, 1866 †) - (ARCTICIDAE) (FOSSIL)
- sedgwickii, Clymenia sedgwickii G.G. Münster, 1840 † - syn of: Pseudoclymenia sedgwickii (G.G. Münster, 1840 †) - (CLYMENIIDAE) (FOSSIL)
- sedgwickii, Gulielmites sedgwickii (Pratt) † - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- sedgwickii, Pleurotomaria sedgwickii Howse, 1848 † - syn of: Mourlonia antrina (von Schlotheim, 1816 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- sedgwickii, Pseudoclymenia sedgwickii (G.G. Münster, 1840 †) - (PSEUDOCLYMENIIDAE) (FOSSIL)
- sedicula, Eatoniella sedicula (C.R. Laws, 1941 †) - (EATONIELLIDAE) (FOSSIL)
- Sedilia, Genus Sedilia W.G. Fargo, 1953 (HORAICLAVIDAE)
- sedilia, Sedilia sedilia (W.H. Dall, 1890 †) - (HORAICLAVIDAE) (FOSSIL)
- Sediliopsis, Genus Sediliopsis E.J. Petuch, 1988 (PSEUDOMELATOMIDAE)
- sedillina, Turbonilla sedillina W.H. Dall & P. Bartsch, 1904 - (PYRAMIDELLIDAE)
- sedillina, Xanthodaphne sedillina (W.H. Dall, 1908) - (RAPHITOMIDAE)
- sedini, Inyoites sedini Zakharov & Moussavi Abnavi, 2013 † - (INYOITIDAE) (FOSSIL)
- sedissana, Monacha sedissana B. Hausdorf, 2000 - (HYGROMIIDAE)
- sedlaki, Cyphoma sedlaki C.N. Cate, 1976 - syn of: Cyphoma mcgintyi H.A. Pilsbry, 1939 - (OVULIDAE)
- sedna, Doriprismatica sedna (Er. Marcus & Ev. Marcus, 1967) - (CHROMODORIDIDAE)
- sedna, Chromodoris sedna Er. Marcus & Ev. Marcus, 1967 - syn of: Doriprismatica sedna (Er. Marcus & Ev. Marcus, 1967) - (CHROMODORIDIDAE)
- seductilis, Pseudochondrula seductilis (E.A. Rossmässler, 1837) - (ENIDAE)
- seductilis, Angiomphalia seductilis (C.A. Westerlund, 1898) - (HYGROMIIDAE)
- seductilis armeniaca, Buliminus seductilis armeniaca L.L.G. de Mortillet, 1854 - syn of: Pseudochondrula seductilis (E.A. Rossmässler, 1837) - (ENIDAE)
- seductor, Euomphalopterus seductor J. Perner, 1903 † - (EUOMPHALIDAE) (FOSSIL)
- seduita, Cyrtoclymenia seduita Pajchlowa, 1972 † - (CYRTOCLYMENIIDAE) (FOSSIL)
- sedula, Prototrachia sedula G.A. Solem, 1984 - (CAMAENIDAE)
- seebachi, Discoptychites seebachi (Mojsisovics, 1882 †) - (STURIIDAE) (FOSSIL)
- Seebachia, Genus Seebachia Holub & Neumayr, 1882 (ASTARTIDAE) (FOSSIL)
- seebachianus, Nautilus seebachianus H.B. Geinitz, 1861 † - syn of: Pteronautilus seebachianus (H.B. Geinitz, 1861 †) - (NAUTILIDAE) (FOSSIL)
- seebachianus, Pteronautilus seebachianus (H.B. Geinitz, 1861 †) - (PLEURONAUTILIDAE) (FOSSIL)
- seelandica, Cassianozyga seelandica K. Bandel, 1991 † - (HARPIDAE) (FOSSIL)
- seelandica, Katosira seelandica E.A.L. Kittl, 1894 † - (SETTSASSIIDAE) (FOSSIL)
- seelandica, Vallandroella seelandica (E.A.L. Kittl, 1894 †) - (TRACHOECIDAE) (FOSSIL)
- seelei, Centrotarphyceras seelei (R.P. Whitfield †) - (TARPHYCERATIDAE) (FOSSIL)
- seeleyi, Aegocrioceras seeleyi (M. von Neumayr & Uhlig, 1881 †) - (AEGOCRIOCERATIDAE) (FOSSIL)
- seeleyi, Crioceratites seeleyi M. von Neumayr & Uhlig, 1881 † - syn of: Aegocrioceras seeleyi (M. von Neumayr & Uhlig, 1881 †) - (CRIOCERATITIDAE) (FOSSIL)
- seeleyi, Callihoplites seeleyi Spath † - (HOPLITIDAE) (FOSSIL)
- seeleyi, Nuculana seeleyi (Gardner) † - (NUCULANIDAE) (FOSSIL)
- Seelya, syn of: Genus Plethospira Ulrich & Scofield 1897 (MURCHISONIIDAE) (FOSSIL)
- seelyeorum, Alcithoe seelyeorum P. Bail & A. Limpus, 2005 - (VOLUTIDAE)
- seelyi, Lophospira seelyi W.J. Raymond, 1908 † - syn of: Lophospira milleri (Miller, 1877 †) - (LOPHOSPIRIDAE) (FOSSIL)
- seelyi, Ooceras seelyi Ruedemann, 1906 † - (OONOCERATIDAE) (FOSSIL)
- seelyi, Centrotarphyceras seelyi (R.P. Whitfield, 1886 †) - (TARPHYCERATIDAE) (FOSSIL)
- seelyi, Valcouroceras seelyi (Ruedemann, 1906 †) - (VALCOUROCERATIDAE) (FOSSIL)
- Seelyoceras, Genus Seelyoceras Ulrich & Foerste, 1936 (TARPHYCERATIDAE) (FOSSIL)
- seemani, Amnicola seemani G.R. von Frauenfeld, 1863 - syn of: Tryonia seemani (G.R. von Frauenfeld, 1863) - (AMNICOLIDAE)
- seemani, Placostylus seemani W.L.H. Dohrn, 1861 - (BOTHRIEMBRYONTIDAE)
- seemani, Tryonia seemani (G.R. von Frauenfeld, 1863) - (COCHLIOPIDAE)
- seemani, Hydrobia seemani G.R. von Frauenfeld, 1863 - syn of: Tryonia seemani (G.R. von Frauenfeld, 1863) - (HYDROBIIDAE)
- seemanni, Amnicola seemanni G.R. von Frauenfeld, 1863 - syn of: Tryonia seemani (G.R. von Frauenfeld, 1863) - (AMNICOLIDAE)
- seemanni, Placostylus seemanni W.L.H. Dohrn, 1861 - syn of: Placostylus seemani W.L.H. Dohrn, 1861 - (BOTHRIEMBRYONTIDAE)
- Seendia, Genus Seendia Casey, 1961 (CARDIIDA (UNASSIGNED)) (FOSSIL)
- seerleyi, Keyserlingites seerleyi Mathews, 1929 † - syn of: Wasatchites perrini Mathews, 1929 † - (SIBIRITIDAE) (FOSSIL)
- seetzeni, Xerocrassa seetzeni (L. Pfeiffer, 1847) - (HYGROMIIDAE)
- seeuriformis, Anodonta seeuriformis Y.Y. Liu, 1979 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- seftoni, Admete seftoni S.S. Berry, 1956 - syn of: Admete gracilior (Carpenter in W.M. Gabb, 1869) - (CANCELLARIIDAE)
- seftoni, Ocinebrina seftoni (E.P. Chace, 1958) - (MURICIDAE)
- segadei, Manzonia segadei E. Rolán, 1987 - (RISSOIDAE)
- segalaunica, Helix segalaunica G. Sayn - syn of: Helix pomatia C. Linnaeus, 1758 - (HELICIDAE)
- segaliana, Cymbovula segaliana C.N. Cate, 1976 - syn of: Cuspivolva queenslandica (C.N. Cate, 1974) - (OVULIDAE)
- segaruensis, Bankia segaruensis G.F. Roch, 1929 - syn of: Bankia carinata (J.E. Gray, 1827) - (TEREDINIDAE)
- segersi, Synprosphyma segersi Grego & Szekeres, 2017 - (CLAUSILIIDAE)
- segersi, Solariella segersi (G.T. Poppe, S.P. Tagaro & H. Dekker, 2006) - (SOLARIELLIDAE)
- segesta, Columbella segesta J.C. Chenu, 1850 - syn of: Macteola segesta cinctura C. Hedley, 1922 - (COLUMBELLIDAE)
- segesta, Macteola segesta (P.L. Duclos, 1850) - (MANGELIIDAE)
- segesta cinctura, Macteola segesta cinctura C. Hedley, 1922 - (MANGELIIDAE)
- segestana, Bithynia segestana L. Benoit, 1882 - syn of: Bithynia tentaculata (C. Linnaeus, 1758) - (BITHYNIIDAE)
- segestana, Murella scabriuscula segestana (R.A. Philippi, 1836) - (HELICIDAE)
- segestana, Loczyceras segestana (Gemmelaro, 1872 †) - (REINECKEIIDAE) (FOSSIL)
- segetum, Xerocrassa segetum P. Fagot, 1888 - syn of: Amandana ripacurcica (A. Bofill, 1886) - (HYGROMIIDAE)
- segmenta, Atrina segmenta W.H. Turton, 1932 - syn of: Atrina squamifera (G.B. Sowerby, 1835) - (PINNIDAE)
- segmenta, Turritella segmenta Gardner, 1947 † - (TURRITELLIDAE) (FOSSIL)
- Segmentaria, syn of: Genus Segmentina J. Fleming, 1822 (PLANORBIDAE)
- segmentata, Trophonopsis segmentata (J.C. Verco, 1909) - (MURICIDAE)
- Segmentella, syn of: Genus Caporbis Bartsch, 1915 (SILIQUARIIDAE)
- segmentina, Chama segmentina S. Clessin, 1889 - syn of: Chama pacifica W.J. Broderip, 1835 - (CHAMIDAE)
- Segmentina, Genus Segmentina J. Fleming, 1822 (PLANORBIDAE)
- segmentina, Abra segmentina H. Adams & A. Adams, 1856 - syn of: Abra segmentum (C.A. Récluz, 1843) - (SEMELIDAE)
- Segmentorbis, Genus Segmentorbis G. Mandahl-Barth, 1954 (PLANORBIDAE)
- segmentum, Abra segmentum (C.A. Récluz, 1843) - (SEMELIDAE)
- segmentum brevis, Syndosmya segmentum brevis P. Fischer, 1867 - syn of: Abra segmentum (C.A. Récluz, 1843) - (SEMELIDAE)
- segmentum incrassata, Syndosmya segmentum incrassata P. Fischer, 1867 - syn of: Abra segmentum (C.A. Récluz, 1843) - (SEMELIDAE)
- segmentum subrostrata, Syndosmya segmentum subrostrata P. Fischer, 1867 - syn of: Abra segmentum (C.A. Récluz, 1843) - (SEMELIDAE)
- segmentum subsrostrata, Abra segmentum subsrostrata P. Fischer, 1867 - syn of: Abra segmentum (C.A. Récluz, 1843) - (SEMELIDAE)
- segne, Choffaticeras segne Solger, 1903 † - (PSEUDOTISSOTIIDAE) (FOSSIL)
- segnis, Macrochlamys segnis H.A. Pilsbry, 1934 - (ARIOPHANTIDAE)
- segnis, Retusa segnis (C.R. Laws, 1940 †) - (RETUSIDAE) (FOSSIL)
- Segnitilia, syn of: Genus Acrorbis N.H. Odhner, 1937 (PLANORBIDAE)
- segondensis, Phasmoconus mucronatus segondensis W.J. Fenzan, 2008 - (CONIDAE)
- segonzaci, Bathycadulus segonzaci V. Scarabino, C.H. Caetano & A. Carranza, 2011 - (GADILIDAE)
- segonzaci, Veleropilina segonzaci (A. Warén & P. Bouchet, 2001) - (NEOPILINIDAE)
- segonzaci, Rokopella segonzaci A. Warén & P. Bouchet, 2001 - syn of: Veleropilina segonzaci (A. Warén & P. Bouchet, 2001) - (NEOPILINIDAE)
- segonzaci, Sinepecten segonzaci E. Schein, 2006 - (PECTINIDAE)
- segonzaci, Provanna segonzaci A. Warén & W.F. Ponder, 1991 - (PROVANNIDAE)
- segravei, Conus segravei J.H. Gatliff, 1891 - syn of: Austroconus clarus (E.A. Smith, 1881) - (CONIDAE)
- segregata, Climocella segregata (H.H. Suter, 1894) - (CHAROPIDAE)
- segregata, Tellina segregata W.H. Dall, 1900 † - (TELLINIDAE) (FOSSIL)
- segregata, Mysia segregata A.E.M. Cossmann, 1887 † - (VENERIDAE) (FOSSIL)
- segregatum, Chondropometes segregatum C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- segregatum arangoi, Chondropometes segregatum arangoi C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- segregatum felipense, Chondropometes segregatum felipense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- segregatum lagunitasense, Chondropometes segregatum lagunitasense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- segregatum laureani, Chondropometes segregatum laureani C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- segregatum mameyi, Chondropometes segregatum mameyi C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- segregatum palmae, Chondropometes segregatum palmae M.I. Sánchez Roig, 1951 - (POMATIIDAE)
- segregatum sporadicum, Chondropometes segregatum sporadicum C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- segregatum vallei, Chondropometes segregatum vallei C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- segregatus, Streptochetus segregatus (G.P. Deshayes, 1865 †) - (FASCIOLARIIDAE) (FOSSIL)
- seguenzae, Coeloceras seguenzae C. Gemmellaro, 1884 † - (COELOCERATIDAE) (FOSSIL)
- seguenzae, Toledonia seguenzae (R.B. Watson, 1886) - (DIAPHANIDAE)
- seguenzae, Diaphana seguenzae R.B. Watson, 1886 - syn of: Toledonia seguenzae (R.B. Watson, 1886) - (DIAPHANIDAE)
- seguenzae, Charonia variegata seguenzae A. Aradas & L. Benoit, 1874 - (RANELLIDAE)
- seguenzae, Jujubinus seguenzae F. Ghisotti & G.C. Melone, 1975 - (TROCHIDAE)
- seguenzae, Verticordia seguenzae W.H. Dall, 1886 - (VERTICORDIIDAE)
- seguenzae, Yoldiella seguenzae A. Bonfitto & B. Sabelli, 1995 - (YOLDIIDAE)
- seguenzai, Rochella seguenzai (Thomas & Peron 1890-1891) † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- seguenzai, Melanella seguenzai S.I. Di Geronimo & R. La Perna, 1999 † - (EULIMIDAE) (FOSSIL)
- seguenzai, Marginella seguenzai R. La Perna & Vazzana, 2016 † - (MARGINELLIDAE) (FOSSIL)
- seguenzai, Odostomia seguenzai P.M. Pallary, 1912 - syn of: Trabecula jeffreysiana (T.A. de M. Monterosato, 1884) - (PYRAMIDELLIDAE)
- seguenzai, Chrysallida seguenzai P.M. Pallary, 1912 - syn of: Trabecula jeffreysiana (T.A. de M. Monterosato, 1884) - (PYRAMIDELLIDAE)
- seguenzai, Chrysostoma seguenzai C. Gemmellaro, 1911 † - (TROCHIDAE) (FOSSIL)
- seguenzai, Gibbula seguenzai (C. De Stefani & D. Pantanelli, 1878 †) - (TROCHIDAE) (FOSSIL)
- seguenzai, Megalomphalus seguenzai A.E.M. Cossmann, 1918 - syn of: Megalomphalus disciformis (J. Granata Grillo, 1877) - (VANIKORIDAE)
- Seguenzia, Genus Seguenzia J.G. Jeffreys, 1876 (SEGUENZIIDAE)
- seguenziana, Phosinella seguenziana (A. Issel, 1869) - (RISSOINIDAE)
- seguenzianus, Adeorbis seguenzianus G.W. Tryon, 1888 - syn of: Megalomphalus disciformis (J. Granata Grillo, 1877) - (TORNIDAE)
- seguenzianus, Megalomphalus seguenzianus G.W. Tryon, 1888 - syn of: Megalomphalus disciformis (J. Granata Grillo, 1877) - (VANIKORIDAE)
- seguenzianus, Vermetus seguenzianus A. Aradas & L. Benoit, 1874 - syn of: Thylaeodus semisurrectus (Ant. Bivona-Bernardi, 1832) - (VERMETIDAE)
- Seguenziella, syn of: Genus Quinnia B.A. Marshall, 1988 (SEGUENZIIDAE)
- SEGUENZIIDAE Verrill, 1884 - Family (GASTROPODA-VETIGASTROPODA [Subclass]-SEGUENZIOIDEA [Superfamily])
- SEGUENZIOIDEA (UNASSIGNED) Verrill, 1884 - Family (GASTROPODA-VETIGASTROPODA [Subclass]-SEGUENZIOIDEA [Superfamily])
- Seguenziopsis, Genus Seguenziopsis B.A. Marshall, 1983 (SEGUENZIIDAE)
- seguenzorum, Rissoa seguenzorum Bertolaso & S. Palazzi, 2000 † - (RISSOIDAE) (FOSSIL)
- seguinensis, Cantharus seguinensis Garvie, 2013 † - (BUCCINIDAE) (FOSSIL)
- seguinensis, Levifusus pagodiformis seguinensis (Garvie, 2013 †) - (ECHINOFULGURIDAE) (FOSSIL)
- seguinensis, Crassauris seguinensis Garvie, 2013 † - (MANGELIIDAE) (FOSSIL)
- seguinensis, Tritiaria seguinensis Garvie, 2013 † - (NASSARIIDAE) (FOSSIL)
- seguinensis, Carinacca seguinensis Garvie, 2013 † - (NATICIDAE) (FOSSIL)
- seguinensis, Adrana seguinensis Garvie, 2013 † - (NUCULANIDAE) (FOSSIL)
- seguinensis, Gibbonucula seguinensis Garvie, 2013 † - (NUCULIDAE) (FOSSIL)
- seguinensis, Johnsonella seguinensis Garvie, 2013 † - (TELLINIDAE) (FOSSIL)
- seguinensis, Idioraphe seguinensis Garvie, 2013 † - (TORNIDAE) (FOSSIL)
- seguini, Praeconia seguini A.E.M. Cossmann, 1900 † - (ASTARTIDAE) (FOSSIL)
- seguini, Clavatula seguini Author unknown † - (CLAVATULIDAE) (FOSSIL)
- seguiniana, Formosana seguiniana (P.M. Heude, 1885) - (CLAUSILIIDAE)
- Seguminaia, syn of: Genus Leguminaia T.A. Conrad, 1865 (UNIONIDAE)
- segurai, Calzadina segurai Forner & Valls, 2014 † - (EUOMPHALIDAE) (FOSSIL)
- segurai, Crenostrea segurai W.P. Woodring, 1976 † - (GRYPHAEIDAE) (FOSSIL)
- segurinii, Horologica segurinii A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- seguyana, Tingitana seguyana (J. Péchaud, 1883) - (HELICIDAE)
- sehndensis, Staufenia sehndensis Hoffmann, 1913 † - (GRAPHOCERATIDAE) (FOSSIL)
- seibaboense, Opisthosiphon obtectum seibaboense C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- seibaboensis, Centralia turgida seibaboensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- seibersdorfensis, Gyraulus seibersdorfensis (Sauerzopf, 1953 ) - (PLANORBIDAE)
- seideli, Himalayites seideli Oppel, 1863 † - (HIMALAYITIDAE) (FOSSIL)
- seidersi, Nekewis seidersi Saul, 1988 † - (PERISSITYIDAE) (FOSSIL)
- seidli, Oxychilus seidli F. Riedel, 1999 - (OXYCHILIDAE)
- seidlitzi, Osperlioceras seidlitzi (Schirardin, 1909 †) - (HILDOCERATIDAE) (FOSSIL)
- seidlitzi, Ebbighausenites seidlitzi (Schindewolf, 1924 †) - (POSTTORNOCERATIDAE) (FOSSIL)
- seignaciana, Gastrocopta seignaciana (J.C.H. Crosse & P.H. Fischer, 1879) - (GASTROCOPTIDAE)
- seignetti, Melanopsis seignetti J.R. Bourguignat, 1884 - (MELANOPSIDAE)
- Seila, Genus Seila A. Adams, 1861 (CERITHIOPSIDAE)
- seilaformis, Mendax seilaformis B.A. Marshall, 1978 - (CERITHIOPSIDAE)
- Seilarex, Genus Seilarex T. Iredale, 1924 (TRIPHORIDAE)
- Seilopsis, Genus Seilopsis J.R. le B. Tomlin, 1931 (CERITHIOPSIDAE)
- seimkanense, Okhototrachyceras seimkanense (Bychkov, 1973 †) - (TRACHYCERATIDAE) (FOSSIL)
- seimkanensis, Proclydonautilus seimkanensis Bychkov, 1976 † - (CLYDONAUTILIDAE) (FOSSIL)
- seimkanensis, Paratibetites seimkanensis Bychkov, 1974 † - syn of: Pterosirenites seimkanensis (Bychkov, 1974 †) - (TIBETITIDAE) (FOSSIL)
- seimkanensis, Pterosirenites seimkanensis (Bychkov, 1974 †) - (TRACHYCERATIDAE) (FOSSIL)
- seimkanensis, Protrachyceras seimkanensis Mojsisovics 1893 † - (TRACHYCERATIDAE) (FOSSIL)
- seimkanensis, Striatosirenites seimkanensis Bychkov, 1973 † - syn of: Arctosirenites canadensis Tozer, 1961 † - (TRACHYCERATIDAE) (FOSSIL)
- Seimkanites, Genus Seimkanites Konstantinov , 1999 (TRACHYCERATIDAE) (FOSSIL)
- seinensis, Alvania seinensis S. Gofas, 2007 - (RISSOIDAE)
- seirensis, Xerocrassa seirensis P. Fagot, 1888 - syn of: Amandana ripacurcica (A. Bofill, 1886) - (HYGROMIIDAE)
- Seironautilus, Genus Seironautilus Zhao & al., 1978 (TAINOCERATIDAE) (FOSSIL)
- Seisa, Genus Seisa (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- seisanensis, Anodonta seisanensis W. Kobelt, 1911 - syn of: Anodonta anatina (C. Linnaeus, 1758) - (UNIONIDAE)
- seishinmaruae, Leptochiton seishinmaruae H. Saito, 1997 - (LEPTOCHITONIDAE)
- seishinmaruae, Dillwynella seishinmaruae K. Hasegawa, 1997 - syn of: Dillwynella sheisinmaruae K. Hasegawa, 1997 - (SKENEIDAE)
- Seisia, Genus Seisia Kutassy, 1934 (DELPHINULOPSIDAE) (FOSSIL)
- seisuimaruae, Veleropilina seisuimaruae Y. Kano, S. Kimura, T. Kimura & A. Warén, 2012 - (NEOPILINIDAE)
- seitzi, Acanthoceras seitzi F. Riedel, 1932 † - (ACANTHOCERATIDAE) (FOSSIL)
- seitzi, Ropoloceras seitzi (Sarkar, 1955 †) - (CRIOCERATITIDAE) (FOSSIL)
- seitzi, Pseudothurmannia seitzi Sarkar, 1955 † - syn of: Ropoloceras seitzi (Sarkar, 1955 †) - (CRIOCERATITIDAE) (FOSSIL)
- seiuncta, Crassispira seiuncta (L.M.D. Bellardi, 1877 †) - (PSEUDOMELATOMIDAE) (FOSSIL)
- sejugata, Macoma sejugata (M. Yokoyama, 1924 †) - (TELLINIDAE) (FOSSIL)
- sejuncta, Clausilia pumila sejuncta (C.A. Westerlund, 1873) - (CLAUSILIIDAE)
- sejunctum, Cerithium sejunctum T. Iredale, 1929 - syn of: Clypeomorus nympha R.S. Houbrick, 1985 - (CERITHIIDAE)
- sejunctus, Lyrotyphis sejunctus (C.G. Semper, 1861 †) - (MURICIDAE) (FOSSIL)
- sekii, Pupa sekii T. Habe, 1958 - (ACTEONIDAE)
- sekincauensis, Amphidromus sekincauensis B. Dharma, 2007 - (CAMAENIDAE)
- Sektionites, Genus Sektionites Farsan & Blind, 1989 (PTERIOIDEA (UNASSIGNED)) (FOSSIL)
- selandica, Plicatula selandica Schnetler, 2001 † - (PLICATULIDAE) (FOSSIL)
- selandica, Odostomia selandica J.P.J. Ravn, 1933 † - (PYRAMIDELLIDAE) (FOSSIL)
- selangoriensis, Alycaeus selangoriensis Foon & Liew, 2017 - (CYCLOPHORIDAE)
- selaphora, Zafra selaphora J.C. Melvill & R. Standen, 1895 - syn of: Zafra selasphora (J.C. Melvill & R. Standen, 1901) - (COLUMBELLIDAE)
- selasia, Satsuma selasia (H.A. Pilsbry, 1902) - (CAMAENIDAE)
- selasia, Oliva selasia P.L. Duclos, 1835 - syn of: Olivella volutella (J.B.P.A. Lamarck, 1811) - (OLIVIDAE)
- selasphora, Zafra selasphora (J.C. Melvill & R. Standen, 1901) - (COLUMBELLIDAE)
- Selastele, Genus Selastele B.A. Marshall, 1995 (CALLIOSTOMATIDAE)
- Selatodryas, Genus Selatodryas Herbert, 2017 (UROCYCLIDAE)
- selayarensis, Asperitas trochus selayarensis (E.A. Smith, 1896) - (DYAKIIDAE)
- selbyensis, Hemimactra selbyensis A. Packard, 1916 † - (MACTRIDAE) (FOSSIL)
- selcanus, Capulus selcanus Giebel, 1858 † - (CAPULIDAE) (FOSSIL)
- selcensis, Montenegrina hiltrudae selcensis Z. Fehér & M. Szekeres, 2016 - (CLAUSILIIDAE)
- selecta, Maurea selecta (L.W. Dillwyn, 1817) - (CALLIOSTOMATIDAE)
- selecta, Colina selecta J.C. Melvill & R. Standen, 1898 - (CERITHIIDAE)
- selecta, Siciliaria gibbula selecta (T.A. de M. Monterosato, 1908.) - (CLAUSILIIDAE)
- selecta, Heikea selecta Isberg, 1934 † - (CYRTODONTIDAE) (FOSSIL)
- selecta, Helix selecta B. Klika, 1894 - syn of: Harmozica selecta (B. Klika, 1894) - (HELICIDAE)
- selecta, Helix selecta J. Bisacchi, 1929 - syn of: Campylaea planospira occultata (M. Paulucci, 1886) - (HELICIDAE)
- selecta, Harmozica selecta (B. Klika, 1894) - (HYGROMIIDAE)
- selecta, Euomphalia selecta (I. Krynicki, 1837) - (HYGROMIIDAE)
- selecta, Lophospira selecta (Billings, 1865 †) - (LOPHOSPIRIDAE) (FOSSIL)
- selecta, Oriostoma selecta J. Perner, 1903 † - (ORIOSTOMATIDAE) (FOSSIL)
- selecta, Vitrea selecta I. Pintér, 1972 - (PRISTILOMATIDAE)
- selecta arborea, Serpulorbis selecta arborea T.A. de M. Monterosato, 1884 - syn of: Thylacodes arenarius (C. Linnaeus, 1758) - (VERMETIDAE)
- selectus, Calliostoma selectus L.W. Dillwyn, 1817 - syn of: Maurea selecta (L.W. Dillwyn, 1817) - (CALLIOSTOMATIDAE)
- selectus, Euchelus selectus J. Perner, 1903 † - syn of: Oriostoma selecta J. Perner, 1903 † - (CHILODONTIDAE) (FOSSIL)
- selectus, Conus selectus A. Adams, 1855 - syn of: Gradiconus monilifer (W.J. Broderip, 1833) - (CONIDAE)
- selectus, Dimorphites selectus Mojsisovics, 1893 † - (JUVAVITIDAE) (FOSSIL)
- selectus, Orthalicus selectus (H. Strebel, 1909) - (ORTHALICIDAE)
- selectus, Trochus selectus L.W. Dillwyn, 1817 - syn of: Maurea selecta (L.W. Dillwyn, 1817) - (TROCHIDAE)
- selectus, Vermetus selectus T.A. de M. Monterosato, 1878 - syn of: Thylacodes arenarius (C. Linnaeus, 1758) - (VERMETIDAE)
- selectus arborea, Vermetus selectus arborea T.A. de M. Monterosato, 1892 - syn of: Thylacodes arenarius (C. Linnaeus, 1758) - (VERMETIDAE)
- selectus ramosa, Vermetus selectus ramosa T.A. de M. Monterosato, 1892 - syn of: Thylacodes arenarius (C. Linnaeus, 1758) - (VERMETIDAE)
- selectus ramosus, Vermetus selectus ramosus T.A. de M. Monterosato, 1892 - syn of: Thylacodes arenarius (C. Linnaeus, 1758) - (VERMETIDAE)
- selenae, Conus selenae J.J. Van Mol, B. Tursch & M. Kempf, 1967 - syn of: Artemidiconus selenae (G.A. de Mol, B. Tursch & M. Kempf, 1967) - (CONIDAE)
- selenae, Artemidiconus selenae (G.A. de Mol, B. Tursch & M. Kempf, 1967) - (CONORBIDAE)
- selenalta, Murchisonia selenalta Heidelberger, 2001 † - (MURCHISONIIDAE) (FOSSIL)
- selencae, Phidiana selencae L.S.R. Bergh, 1879 - syn of: Phidiana lynceus L.S.R. Bergh, 1867 - (FACELINIDAE)
- selene, Acrosterigma selene E. Vidal, 1999 - (CARDIIDAE)
- selene, Mitromorpha selene (J. Espinosa & J.A. Ortea, 2009) - (MITROMORPHIDAE)
- selene, Mitrolumna selene J. Espinosa & J.A. Ortea, 2009 - syn of: Mitromorpha selene (J. Espinosa & J.A. Ortea, 2009) - (MITROMORPHIDAE)
- selene, Octopus selene N.A. Voss, 1971 - (OCTOPODIDAE)
- selene, Gulella selene A.C. van Bruggen & J.L. Van Goethem, 1999 - (STREPTAXIDAE)
- selengensis, Korotnewia korotnevi selengensis (Kozhov, 1936) - (AMNICOLIDAE)
- selengensis, Anodonta selengensis W. Dybowski, 1913 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- Selenimyalina, Genus Selenimyalina Newell, 1942 (MYALINIDAE) (FOSSIL)
- selenina, Lacteoluna selenina (A.A. Gould, 1848) - (SAGDIDAE)
- seleniscus, Amphiaraus seleniscus Vokes 1946 † - (ASTARTIDAE) (FOSSIL)
- Selenites, syn of: Genus Haplotrema C.M.F. Ancey, 1881 (HAPLOTREMATIDAE)
- selenitoides, Discus selenitoides H.A. Pilsbry, 1890 - (DISCIDAE)
- selenkae, Splendrillia selenkae (A. von Koenen, 1872 †) - (DRILLIIDAE) (FOSSIL)
- selenkai, Habroconus selenkai (L. Pfeiffer, 1866) - (EUCONULIDAE)
- Selenoceras, Genus Selenoceras Zhuravleva, 1972 (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- Selenochlamys, Genus Selenochlamys O. Bφttger, 1883 (TRIGONOCHLAMYDIDAE)
- selenomphala, Maurea punctulata selenomphala H.A. Pilsbry - (CALLIOSTOMATIDAE)
- selenomphala, Ethalia guamensis selenomphala H.A. Pilsbry, 1902 - (TROCHIDAE)
- Selenophaedusa, Subgenus Hemiphaedusa (Selenophaedusa) W.A. Lindholm, 1924 (CLAUSILIIDAE)
- selenoplicata, Diplommatina tosana selenoplicata J.T. Kuroda & J.M. Abe, 1980 - (DIPLOMMATINIDAE)
- Selenoptyx, Genus Selenoptyx H.A. Pilsbry, 1908 (CLAUSILIIDAE)
- selenostoma, Solaropsis selenostoma (L. Pfeiffer, 1852) - (PLEURODONTIDAE)
- Selenoteuthis, Genus Selenoteuthis N.A. Voss, 1959 (LYCOTEUTHIDAE)
- Selesinuites, Genus Selesinuites Hornύ, 1997 (SINUITIDAE) (FOSSIL)
- selina, Bulla selina T. Iredale, 1929 - syn of: Bulla ampulla C. Linnaeus, 1758 - (BULLIDAE)
- selinae, Peristernia selinae J.C. Melvill, 1891 - syn of: Peristernia chlorostoma (G.B. I Sowerby, 1825) - (FASCIOLARIIDAE)
- selindeica, Pseudoyangtzespira selindeica Bokova, 1990 † - syn of: Oelandiella korobkovi (Vostokova, 1962 †) - (HELCIONELLIDAE) (FOSSIL)
- selinuntina, Murella scabriuscula selinuntina (R.A. Philippi, 1836) - (HELICIDAE)
- selkirkense, Pleurorthoceras selkirkense (J.J.F. Whiteaves, 1892 †) - (GEISONOCERATIDAE) (FOSSIL)
- selkirkense, Orthoceras selkirkense J.J.F. Whiteaves, 1892 † - syn of: Pleurorthoceras selkirkense (J.J.F. Whiteaves, 1892 †) - (ORTHOCERATIDAE) (FOSSIL)
- selkirki, Amphidoxa selkirki E.A. Smith, 1884 - (CHAROPIDAE)
- selkirkii, Aclisina selkirkii J. Donald, 1898 † - syn of: Aclisina striatula (de Koninck, 1844 †) - (MURCHISONIIDAE) (FOSSIL)
- Selkirkoceras, Genus Selkirkoceras Foerste, 1929 (ARMENOCERATIDAE) (FOSSIL)
- sella, Pododesmus sella R. Tate, 1886 † - (ANOMIIDAE) (FOSSIL)
- sella, Anomia sella J.F. Gmelin, 1791 - syn of: Placuna ephippium (L. Philipsson, 1788) - (ANOMIIDAE)
- sella, Amblychilepas sella G.B. Sowerby, 1862 - syn of: Dendrofissurella scutellum (J.F. Gmelin, 1791) - (FISSURELLIDAE)
- sella, Placuna sella J.F. Gmelin, 1791 - syn of: Placuna ephippium (L. Philipsson, 1788) - (PLACUNIDAE)
- sella, Meekia sella W.M. Gabb, 1864 † - (TANCREDIIDAE) (FOSSIL)
- sella junior, Placuna sella junior L.W. Dillwyn, 1817 † - syn of: Burmesia krumbecki C. Chen, 1961 † - (PLACUNIDAE) (FOSSIL)
- sella minor, Anomia sella minor J.F. Gmelin, 1791 † - syn of: Burmesia krumbecki C. Chen, 1961 † - (ANOMIIDAE) (FOSSIL)
- sella minor, Placuna sella minor J.F. Gmelin, 1791 † - syn of: Burmesia krumbecki C. Chen, 1961 † - (PLACUNIDAE) (FOSSIL)
- Sellaclymenia, Genus Sellaclymenia Sepkoski Jr., 2002 (SELLACLYMENIIDAE) (FOSSIL)
- SELLACLYMENIIDAE Schindewolf, 1923 - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CLYMENIIDA [Order]-GONIOCLYMENIOIDEA [Superfamily]) (FOSSIL)
- sellae, Miltoceras sellae (C. Gemmellaro, 1884 †) - (COELOCERATIDAE) (FOSSIL)
- Sellaea, Genus Sellaea Di Stefano, 1889 (CAPRINULIDAE) (FOSSIL)
- sellaeformis, Cubitostrea sellaeformis (T.A. Conrad, 1832 †) - (OSTREIDAE) (FOSSIL)
- sellaeformis thomasi, Ostrea sellaeformis thomasi L.C. Glenn, 1904 - syn of: Hyotissa mcgintyi (H.W. Harry, 1985) - (OSTREIDAE)
- sellaensis, Coxiconchia sellaensis Sanchez & Babin 2005 † - (COXICONCHIIDAE) (FOSSIL)
- sellaensis, Coxiconchia sellaensis P. Sánchez & Babin, 2005 † - (COXICONCHIIDAE) (FOSSIL)
- sellaformis, Hyotissa sellaformis W. Saville-Kent, 1891 - syn of: Parahyotissa imbricata (J.B.P.A. Lamarck, 1819) - (GRYPHAEIDAE)
- sellaformis, Ostrea sellaformis W. Saville-Kent, 1891 - syn of: Parahyotissa imbricata (J.B.P.A. Lamarck, 1819) - (OSTREIDAE)
- Sellagoniatites, Genus Sellagoniatites House , 1963 (AGONIATITIDAE) (FOSSIL)
- sellai, Loxonema sellai E.A.L. Kittl, 1899 † - (LOXONEMATIDAE) (FOSSIL)
- sellai, Paratropites sellai Mojsisovics, 1893 † - (TROPITIDAE) (FOSSIL)
- Sellanarcestes, Genus Sellanarcestes Schindewolf , 1933 (ANARCESTIDAE) (FOSSIL)
- sellardsi, Tarrantoceras sellardsi (Adkins, 1928 †) - (ACANTHOCERATIDAE) (FOSSIL)
- sellardsi, Marathonites sellardsi Plummer & P.H. Scott, 1937 † - syn of: Almites sellardsi (Plummer & P.H. Scott, 1937 †) - (ADRIANITIDAE) (FOSSIL)
- sellardsi, Anadara sellardsi W.C. Mansfield, 1932 † - (ARCIDAE) (FOSSIL)
- sellardsi, Capulus sellardsi Beede, 1907 † - syn of: Gryphellina sellardsi (Beede, 1907 †) - (CAPULIDAE) (FOSSIL)
- sellardsi, Fragum sellardsi Gardner, 1926 † - (CARDIIDAE) (FOSSIL)
- sellardsi, Gryphellina sellardsi (Beede, 1907 †) - (LIMIDAE) (FOSSIL)
- sellardsi, Lima sellardsi L.W. Stephenson, 1941 † - (LIMIDAE) (FOSSIL)
- sellardsi, Almites sellardsi (Plummer & P.H. Scott, 1937 †) - (MARATHONITIDAE) (FOSSIL)
- sellardsi, Paraceltites sellardsi Miller & Furnish, 1940 † - syn of: Paraceltites elegans Girty, 1909 † - (PARACELTITIDAE) (FOSSIL)
- sellardsi, Parashumardites sellardsi (Plummer & P.H. Scott, 1937 †) - (PARASHUMARDITIDAE) (FOSSIL)
- sellardsi, Shumardites sellardsi Plummer & P.H. Scott, 1937 † - syn of: Parashumardites sellardsi (Plummer & P.H. Scott, 1937 †) - (SHUMARDITIDAE) (FOSSIL)
- sellardsi, Peritrochia sellardsi Plummer & P.H. Scott, 1937 † - syn of: Almites sellardsi (Plummer & P.H. Scott, 1937 †) - (VIDRIOCERATIDAE) (FOSSIL)
- sellare, Cerion sanzi sellare C.G. Aguayo & M.I. Sánchez Roig, 1953 - (CERIONIDAE)
- Sellaria, syn of: Genus Placuna J. Lightfoot, 1786 (PLACUNIDAE)
- sellatus, Philomycus sellatus L.R. Hubricht, 1972 - (PHILOMYCIDAE)
- sellei, Eocypraea sellei (J.B.C.P. de Raincourt, 1874 †) - (EOCYPRAEIDAE) (FOSSIL)
- sellei, Arcopagia sellei A.E.M. Cossmann, 1886 † - (TELLINIDAE) (FOSSIL)
- sellersi, Aspastus sellersi (J.C. Cox, 1871) - (BOTHRIEMBRYONTIDAE)
- sellersi, Bulimus sellersi J.C. Cox, 1871 - syn of: Aspastus sellersi (J.C. Cox, 1871) - (BULIMULIDAE)
- sellersi, Megalacron sellersi (J.C. Cox, 1871) - (CAMAENIDAE)
- selli, Drymaeus selli (H.B. Preston, 1909) - (BULIMULIDAE)
- selli, Clathurella selli H.B. Preston, 1908 - (CLATHURELLIDAE)
- Sellia, Genus Sellia de Raincourt, 1884 (HYDROBIIDAE)
- selliana, Charpentieria selliana C. Pollonera, 1885 - syn of: Charpentieria dyodon thomasiana (H.C. Küster, 1850) - (CLAUSILIIDAE)
- selliformis, Teredo selliformis F.B. Meek & Hayden, 1860 † - syn of: Nototeredo globosa (F.B. Meek & Hayden, 1858 †) - (TEREDINIDAE) (FOSSIL)
- sellii, Teredo sellii J. van der Hoeven, 1850 - syn of: Teredo navalis C. Linnaeus, 1758 - (TEREDINIDAE)
- Sellinema, Genus Sellinema Perner, 1903 (SINUOPEIDAE) (FOSSIL)
- sello, Pleurotoma sello W.H. Dall, 1918 - (TURRIDAE)
- Selma, Genus Selma A. Adams, 1864 (EULIMIDAE)
- selmae, Niveria selmae (O. Böttger, 1901) - (TRIVIIDAE)
- selmaniana, Cernuella selmaniana R.A.M. Brandt, 1959 - (HYGROMIIDAE)
- Selonoptyx, syn of: Genus Selenoptyx H.A. Pilsbry, 1908 (CLAUSILIIDAE)
- selot, Nerita selot C.A. Récluz, 1850 - syn of: Nerita versicolor J.F. Gmelin, 1791 - (NERITIDAE)
- selseiensis, Conus selseiensis Cossmann, 1896 † - (CONIDAE) (FOSSIL)
- selskii, Bradybaena selskii G. Gerstfeldt, 1859 - (BRADYBAENIDAE)
- selskii, Helix selskii L. von Schrenck, 1867 - syn of: Acusta ravida (W.H. Benson, 1842) - (HELICIDAE)
- Selva, syn of: Genus Cuthona J. Alder & A. Hancock, 1855 (FIONIDAE)
- selva, Ercolania selva J.A. Ortea & J. Espinosa, 2001 - (LIMAPONTIIDAE)
- selvagensis, Atlanta selvagensis De Vera & R.R. Seapy, 2006 - (ATLANTIDAE)
- selvagensis, Trochus selvagensis F.F. Talavera, 1978 - syn of: Phorcus atratus selvagensis F.F. Talavera, 1978 - (TROCHIDAE)
- selvagensis, Phorcus atratus selvagensis F.F. Talavera, 1978 - (TROCHIDAE)
- Selwoodites, Genus Selwoodites Becker , 2002 (SPORADOCERATIDAE) (FOSSIL)
- selwyni, Halobia selwyni McRoberts, 2011 † - (HALOBIIDAE) (FOSSIL)
- selwyni, Alathyria selwyni T. Iredale, 1943 - syn of: Alathyria jacksoni T. Iredale, 1934 - (HYRIIDAE)
- selwyni, Inoceramus selwyni McLearn, 1926 † - (INOCERAMIDAE) (FOSSIL)
- selwyni, Griesbachites selwyni McLearn, 1940 † - (JUVAVITIDAE) (FOSSIL)
- selwyni, Nitanoceras selwyni (McLearn, 1930 †) - (MEGAPHYLLITIDAE) (FOSSIL)
- selwyni, Trophon selwyni (G.B. Pritchard, 1896 †) - (MURICIDAE) (FOSSIL)
- selwyni, Amphipopanoceras selwyni McLearn, 1948 † - (PARAPOPANOCERATIDAE) (FOSSIL)
- selwyni, Thisbites selwyni Tozer, 1994 † - (THISBITIDAE) (FOSSIL)
- selwyni, Turris selwyni (Pritch, 1904 †) - (TURRIDAE) (FOSSIL)
- selwynianum, Ammonites selwynianum J.J.F. Whiteaves, 1879 † - syn of: Desmophyllites diphylloides (E. Forbes, 1846 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- Selwynoceras, syn of: Genus Collignoniceras Breistroffer , 1947 (COLLIGNONICERATIDAE) (FOSSIL)
- selysi, Turricula selysi (Koninck, 1837 †) - (CLAVATULIDAE) (FOSSIL)
- selysiana, Cypricardella selysiana (de Koninck, 1842 †) - (CRASSATELLIDAE) (FOSSIL)
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