- suva, Turbonilla suva A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- suvaensis, Argyropeza suvaensis H.S. Ladd, 1977 † - (CERITHIIDAE) (FOSSIL)
- suvaensis, Lucidestea suvaensis (H.S. Ladd, 1966 †) - (RISSOIDAE) (FOSSIL)
- suwaneensis, Aequipecten suwaneensis W.H. Dall, 1898 † - (PECTINIDAE) (FOSSIL)
- suwanneensis, Solenosteira suwanneensis E.J. Petuch, 1997 † - (BUCCINIDAE) (FOSSIL)
- suwanneensis, Cestumcerithium suwanneensis (W.C. Mansfield, 1937 †) - (CERITHIIDAE) (FOSSIL)
- suwanneensis, Persicula suwanneensis E.J. Petuch, 1997 † - (CYSTISCIDAE) (FOSSIL)
- suwanneensis, Pecten suwanneensis W.H. Dall, 1898 † - (PECTINIDAE) (FOSSIL)
- suwanneensis, Vasum suwanneensis E.J. Petuch, 1997 † - (TURBINELLIDAE) (FOSSIL)
- suwannensis, Glycymeris suwannensis W.C. Mansfield, 1937 † - (GLYCYMERIDIDAE) (FOSSIL)
- suwannensis, Vasum suwannensis E.J. Petuch, 1997 † - syn of: Vasum suwanneensis E.J. Petuch, 1997 † - (TURBINELLIDAE) (FOSSIL)
- Suwannescapha, Genus Suwannescapha Petuch, 1997 † (CYLICHNIDAE) (FOSSIL)
- suworovi, Nucula suworovi Pronina, 1980 † - syn of: Leionucula hannibali (Clark, 1925 †) - (NUCULIDAE) (FOSSIL)
- suxdorfi, Drillia suxdorfi H. Strebel, 1905 - (DRILLIIDAE)
- suxianensis, Aimitus suxianensis Z.X. Qian, 1989 † - (HYOLITHIDA (UNASSIGNED)) (FOSSIL)
- suzakiensis, Eomeretrix suzakiensis (Valintsova-Marnulinko 1935) † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- suzanna, Cerithium suzanna A.V.M.D. D'Orbigny, 1850 † - syn of: Moniquia suzanna (A.V.M.D. D'Orbigny, 1850 †) - (CERITHIIDAE) (FOSSIL)
- suzanna, Moniquia suzanna (A.V.M.D. D'Orbigny, 1850 †) - (PACHYCHILIDAE) (FOSSIL)
- suzanna, Faunus suzanna A.V.M.D. D'Orbigny, 1850 † - syn of: Moniquia suzanna (A.V.M.D. D'Orbigny, 1850 †) - (PACHYCHILIDAE) (FOSSIL)
- suzanna, Nisipyrgiscus suzanna K.H.J. Thiele, 1925 - syn of: Nisipyrgiscus susanna (K.H.J. Thiele, 1925) - (PYRAMIDELLIDAE)
- suzannae, Pleurifera suzannae (J. Drivas & M. Jay, 1990) - (COLUMBELLIDAE)
- suzannae, Conus suzannae H.M. van Rossum, 1990 - syn of: Cylinder textile (C. Linnaeus, 1758) - (CONIDAE)
- suzannae, Nesovitrea suzannae W.L. Pratt, 1978 - (ZONITIDAE)
- suzanneae, Reticulidia suzanneae Á. Valdés & D.W. Behrens, 2002 - (PHYLLIDIIDAE)
- suzettae, Miralda suzettae E. Saurin, 1959 - (PYRAMIDELLIDAE)
- suzuki, Stilapex suzuki T. Habe, 1991 - (EULIMIDAE)
- suzukii, Anadara suzukii H. Noda, 1966 - syn of: Anadara consociata (E.A. Smith, 1885) - (ARCIDAE)
- suzukii, Arca suzukii H. Noda, 1966 - syn of: Anadara consociata (E.A. Smith, 1885) - (ARCIDAE)
- suzukii, Typhis suzukii C.M. Lopez, 1977 - (MURICIDAE)
- suzukii, Cosmetodon suzukii Nakazawa, 1999 † - (PARALLELODONTIDAE) (FOSSIL)
- suzukii, Pecten suzukii T. Kobayashi, 1931 † - syn of: Tosapecten suzukii (T. Kobayashi, 1931 †) - (PECTINIDAE) (FOSSIL)
- suzukii, Tosapecten suzukii (T. Kobayashi, 1931 †) - (TOSAPECTINIDAE) (FOSSIL)
- suzukii, Columbarium suzukii T. Habe & S. Kosuge, 1972 - (TURBINELLIDAE)
- suzukii fujimotoi, Tosapecten suzukii fujimotoi (T. Kobayashi, 1935 †) - (TOSAPECTINIDAE) (FOSSIL)
- suzukii hirogariformis, Tosapecten suzukii hirogariformis (T. Kobayashi & M. Ichikawa, 1949 †) - (TOSAPECTINIDAE) (FOSSIL)
- suzukii inflatus, Tosapecten suzukii inflatus T. Kobayashi & M. Ichikawa, 1949 † - syn of: Tosapecten suzukii fujimotoi (T. Kobayashi, 1935 †) - (TOSAPECTINIDAE) (FOSSIL)
- suzukii okadai, Tosapecten suzukii okadai Nakazawa, 1960 † - (TOSAPECTINIDAE) (FOSSIL)
- suzukii paucicostatus, Tosapecten suzukii paucicostatus (T. Kobayashi & M. Ichikawa, 1949 †) - (TOSAPECTINIDAE) (FOSSIL)
- suzukii regularis, Tosapecten suzukii regularis T. Kobayashi, 1964 † - syn of: Tosapecten suzukii (T. Kobayashi, 1931 †) - (TOSAPECTINIDAE) (FOSSIL)
- suzumai, Buccinum suzumai T. Habe & K. Itô, 1980 - (BUCCINIDAE)
- suzzalloi, Barbatia suzzalloi C.S. Weaver & K.V.W. Palmer, 1922 † - (ARCIDAE) (FOSSIL)
- svalbardense, Wangoceras svalbardense (Korchinskaya, 1980 †) - (HERACLITIDAE) (FOSSIL)
- svalbardense, Pterotoceras svalbardense Korchinskaya, 1980 † - syn of: Wangoceras svalbardense (Korchinskaya, 1980 †) - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- svalbardensis, Hikidea svalbardensis Kaim, Hryniewic, Little & Nakrem, 2017 † - (COLLONIIDAE) (FOSSIL)
- svalbardensis, Vorkutopecten svalbardensis Nakazawa, 1999 † - (DELTOPECTINIDAE) (FOSSIL)
- svalbardensis, Hoplites svalbardensis Nagy, 1970 † - (HOPLITIDAE) (FOSSIL)
- svalbardensis, Nucinella svalbardensis Hryniewicz & al., 2014 † - (NUCINELLIDAE) (FOSSIL)
- Svalbardiceras, Genus Svalbardiceras Frebold , 1930 † (SIBIRITIDAE) (FOSSIL)
- Svanetia, Subgenus Limax (Svanetia) P. Hesse, 1926 (LIMACIDAE)
- svaneticus, Limax svaneticus H.R. Simroth, 1912 - syn of: Svanetia caucasica (H.R. Simroth, 1898) - (LIMACIDAE)
- svecicus, Musculus svecicus (O. Fabricius, 1788) - (MYTILIDAE)
- svelana, Vaginula svelana H.R. Simroth, 1918 - syn of: Semperula maculata (J. Templeton, 1858) - (VERONICELLIDAE)
- svelta, Mitrella svelta W. Kobelt, 1888 - syn of: Mitrella lanceolata (É.A.A. Locard, 1886) - (COLUMBELLIDAE)
- Sveltella, Genus Sveltella A.E.M. Cossmann, 1889 (CANCELLARIIDAE)
- Sveltia, Genus Sveltia F.P. Jousseaume, 1887 (CANCELLARIIDAE)
- sveraki, Cimrmaniela sveraki Fryda & al., 2013 † - (PALAEOZYGOPLEURIDAE) (FOSSIL)
- sverdrupi, Bellerophon sverdrupi Tolmachoff, 1930 † - (BELLEROPHONTIDAE) (FOSSIL)
- sverdrupi, Neodimorphoceras sverdrupi Nassichuk, 1975 † - (NEODIMORPHOCERATIDAE) (FOSSIL)
- sverdrupi, Argopecten sverdrupi J.W. Durham, 1950 † - (PECTINIDAE) (FOSSIL)
- sverdrupi, Amundiptychites sverdrupi (Kemper & Jeletzky, 1979 †) - (POLYPTYCHITIDAE) (FOSSIL)
- sverdrupi, Vavilovites sverdrupi (Tozer, 1963 †) - (PROPTYCHITIDAE) (FOSSIL)
- sverdrupi, Arctosirenites sverdrupi (E.A.L. Kittl, 1907 †) - (TRACHYCERATIDAE) (FOSSIL)
- Sverdrupites, Genus Sverdrupites Nassichuk, 1970 † (SPIROLEGOCERATIDAE) (FOSSIL)
- svetlanae, Propebela svetlanae I.P. Bogdanov, 1989 - (MANGELIIDAE)
- svetlanae, Gracilites svetlanae Bogoslovsky, 1972 † - (TEICHERTICERATIDAE) (FOSSIL)
- Svetlanoceras, Genus Svetlanoceras Ruzhentsev , 1974 † (PARAGASTRIOCERATIDAE) (FOSSIL)
- sveva, Brightia sveva Bonarelli, 1893 † - (OPPELIIDAE) (FOSSIL)
- svevae, Marginella svevae T. Cossignani, 2014 - (MARGINELLIDAE)
- svevum, Hecticoceras svevum Bonarelli, 1893 † - syn of: Brightia sveva Bonarelli, 1893 † - (OPPELIIDAE) (FOSSIL)
- svilajanus, Detoniceras svilajanus Balini & al., 2006 † - (CERATITIDAE) (FOSSIL)
- svilajiensis, Netschajewia svilajiensis Chorowicz & Termier, 1975 † - (KALENTERIDAE) (FOSSIL)
- svinitensis, Leptoceratoides svinitensis (Avram, 1999 †) - (LEPTOCERATOIDIDAE) (FOSSIL)
- svobodai, Palaeozygopleura svobodai Horný, 1955 † - (PALAEOZYGOPLEURIDAE) (FOSSIL)
- swainensis, Athleta studeri swainensis P. Bail & A. Limpus, 1998 - (VOLUTIDAE)
- swainsensis, Bellerophon swainsensis E.K. Yoo, 1994 † - (BELLEROPHONTIDAE) (FOSSIL)
- swainsiana, Colpospira swainsiana (T.A. Garrard, 1982) - (TURRITELLIDAE)
- swainsiana, Acutospira swainsiana T.A. Garrard, 1982 - syn of: Colpospira swainsiana (T.A. Garrard, 1982) - (TURRITELLIDAE)
- Swainson, Brachidontes Swainson 1840 † - (MYTILIDAE) (FOSSIL)
- swainsoni, Achatinella decipiens swainsoni L. Pfeiffer, 1855 - (ACHATINELLIDAE)
- swainsoni, Pomacea swainsoni (R.A. Philippi, 1852) - (AMPULLARIIDAE)
- swainsoni, Pomacea swainsoni Phil, 1851 - syn of: Pomacea lineata (J.B. von Spix, 1827) - (AMPULLARIIDAE)
- swainsoni, Bulimus swainsoni L. Pfeiffer, 1845 - syn of: Auris chrysostoma swainsoni (L. Pfeiffer, 1845) - (BULIMULIDAE)
- swainsoni, Auris chrysostoma swainsoni (L. Pfeiffer, 1845) - (BULIMULIDAE)
- swainsoni, Tonicia swainsoni (G.B. I Sowerby in W.J. Broderip & G.B. I Sowerby, 1832) - (CHITONIDAE)
- swainsoni, Columbella swainsoni O.A.L. Mörch, 1859 - syn of: Nitidella nitida (J.B.P.A. Lamarck, 1822) - (COLUMBELLIDAE)
- swainsoni, Nitidella swainsoni O.A.L. Mörch, 1859 - syn of: Nitidella nitida (J.B.P.A. Lamarck, 1822) - (COLUMBELLIDAE)
- swainsoni, Vituliconus swainsoni (J.C. Estival & R. von Cosel, 1986) - (CONIDAE)
- swainsoni, Asprella swainsoni L.W. Schaufuss 1869 † - (CONIDAE) (FOSSIL)
- swainsoni, Fusimitra swainsoni (W.J. Broderip, 1836) - (MITRIDAE)
- swainsoni, Pterynotus swainsoni O.G. Michelotti, 1841 † - (MURICIDAE) (FOSSIL)
- swainsoni, Mya swainsoni W. Turton, 1822 - syn of: Mya truncata C. Linnaeus, 1758 - (MYIDAE)
- swainsoni, Dolomena swainsoni (L.A. Reeve, 1850) - (STROMBIDAE)
- swainsoni, Strioterebrum swainsoni (G.P. Deshayes, 1859) - (TEREBRIDAE)
- swainsoni, Trochomorpha swainsoni (L. Pfeiffer, 1846) - (TROCHOMORPHIDAE)
- swainsoni, Unio swainsoni G.B. Sowerby, 1868 - syn of: Alasmidonta undulata (T. Say, 1817) - (UNIONIDAE)
- swainsoni, Mekongia swainsoni (H.C. Lea, 1856) - (VIVIPARIDAE)
- swainsoni, Alcithoe swainsoni J. Marwick, 1926 - syn of: Alcithoe arabica swainsoni J. Marwick, 1926 - (VOLUTIDAE)
- swainsoni, Alcithoe arabica swainsoni J. Marwick, 1926 - (VOLUTIDAE)
- swainsoni braueri, Mekongia swainsoni braueri (W. Kobelt, 1908) - (VIVIPARIDAE)
- swainsoni flavida, Mekongia swainsoni flavida R.A.M. Brandt - (VIVIPARIDAE)
- swainsoni inflexa, Terebra swainsoni inflexa W.H. Pease, 1869 - syn of: Strioterebrum swainsoni (G.P. Deshayes, 1859) - (TEREBRIDAE)
- swainsoni kmeriana, Mekongia swainsoni kmeriana (G. von dem Busch, 1844) - (VIVIPARIDAE)
- swainsoni motutaraensis, Alcithoe arabica swainsoni motutaraensis A.W.B. Powell, 1928 - (VOLUTIDAE)
- swainsoni zaca, Fusimitra swainsoni zaca A.M. Strong, G.D. Hanna & L.G. Hertlein, 1933 - (MITRIDAE)
- Swainsonia, Subgenus Scabricola (Swainsonia) H. Adams & A. Adams, 1853 (MITRIDAE)
- swainsoniana, Persicula swainsoniana (S.A.A. Petit De La Saussaye, 1851) - (CYSTISCIDAE)
- swainsoniana, Helix swainsoniana C.B. Adams, 1851 - syn of: Pleurodonte tridentina (A.E.J. Férussac in L. Pfeiffer, 1842) - (HELICIDAE)
- swainsonii, Imbricaria swainsonii R.P. Lesson, 1831 - syn of: Imbricaria conularis (J.B.P.A. Lamarck, 1811) - (MITRIDAE)
- swainsonii antillensis, Mitra swainsonii antillensis (W.H. Dall, 1889) - syn of: Mitra antillensis (W.H. Dall, 1889) - (MITRIDAE)
- swakopmundensis, Patella swakopmundensis W. Massier, 2009 - (PATELLIDAE)
- swalesi, Balea swalesi R.C. Preece & E. Gittenberger, 2003 - (CLAUSILIIDAE)
- swallovana, Stenoloron swallovana (J.W. Hall, 1856 †) - (GOSSELETINIDAE) (FOSSIL)
- swallovana, Aclisina swallovana H.B. Geinitz, 1866 † - syn of: Royalella swallowiana (H.B. Geinitz, 1866 †) - (MURCHISONIIDAE) (FOSSIL)
- swallovana, Pleurotomaria swallovana J.W. Hall, 1856 † - syn of: Stenoloron swallovana (J.W. Hall, 1856 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- swallovi, Metoicoceras swallovi (Shumard, 1859 †) - (ACANTHOCERATIDAE) (FOSSIL)
- swallovi, Promytilus swallovi (McChesney, 1860 †) - (MYTILIDAE) (FOSSIL)
- swalloviana, Chemnitzia swalloviana Shumard, 1859 † - syn of: Zygopleura swalloviana (Shumard, 1859 †) - (PYRAMIDELLIDAE) (FOSSIL)
- swalloviana, Zygopleura swalloviana (Shumard, 1859 †) - (ZYGOPLEURIDAE) (FOSSIL)
- swalloviforme, Metoicoceras swalloviforme M. Collignon, 1964 † - syn of: Mrhiliceras lapparenti (Pervinquière, 1907 †) - (ACANTHOCERATIDAE) (FOSSIL)
- swallowiana, Royalella swallowiana (H.B. Geinitz, 1866 †) - (DONALDINIDAE) (FOSSIL)
- swallowiana, Bembexia swallowiana J.W. Hall, 1856 † - syn of: Stenoloron swallovana (J.W. Hall, 1856 †) - (EOTOMARIIDAE) (FOSSIL)
- swallowiana, Turbonilla swallowiana H.B. Geinitz, 1866 † - syn of: Royalella swallowiana (H.B. Geinitz, 1866 †) - (PYRAMIDELLIDAE) (FOSSIL)
- swanae, Acrosterigma swanae (Maxwell, Congdon & Rymer, 2016) - (CARDIIDAE)
- swani, Turbonilla swani W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- swanii, Mopalia swanii P.P. Carpenter, 1864 - (MOPALIIDAE)
- swansoni, Pterynotus swansoni L.G. Hertlein & A.M. Strong, 1951 - syn of: Pteropurpura centrifuga (R.B. Hinds, 1844) - (MURICIDAE)
- swarkoi, Euchasma swarkoi Pojeta & al., 1977 † - (EOPTERIIDAE) (FOSSIL)
- swartsi, Glycymeris swartsi L.G. Hertlein, 1927 † - (GLYCYMERIDIDAE) (FOSSIL)
- swartzi, Pionoceras swartzi Ulrich & al., 1942 † - (TARPHYCERATIDAE) (FOSSIL)
- swatowensis, Naranjia swatowensis (T.C. Yen, 1939) - (AMPHIBOLIDAE)
- swaubsibu, Tonicia swaubsibu (G.B. I Sowerby) - (CHITONIDAE)
- swearingeni, Tritia swearingeni (E.J. Petuch & R.F. Myers, 2014 †) - (NASSARIIDAE) (FOSSIL)
- swedenborgiana, Loxonema swedenborgiana King, 1850 † - syn of: Chemnitzia roessleri (H.B. Geinitz, 1852 †) - (LOXONEMATIDAE) (FOSSIL)
- swedmarki, Lepidomenia swedmarki L. Salvini-Plawén, 1985 - (LEPIDOMENIIDAE)
- swedmarki, Meiomenia swedmarki P. Morse, 1979 - (MEIOMENIIDAE)
- sweetgrassensis, Baculites sweetgrassensis Cobban, 1951a † - (BACULITIDAE) (FOSSIL)
- sweeti, Vimentum sweeti C. Hedley, 1899 - syn of: Epicodakia sweeti (C. Hedley, 1899) - (CARDITIDAE)
- sweeti, Holopea sweeti R.P. Whitfield, 1882 † - syn of: Sinuopea sweeti (R.P. Whitfield, 1882 †) - (HOLOPEIDAE) (FOSSIL)
- sweeti, Epicodakia sweeti (C. Hedley, 1899) - (LUCINIDAE)
- sweeti, Sinuopea sweeti (R.P. Whitfield, 1882 †) - (SINUOPEIDAE) (FOSSIL)
- Sweetoceras, Genus Sweetoceras Stumbur , 1962 † (TARPHYCERATIDAE) (FOSSIL)
- swenneni, Volvarina swenneni J. Espinosa, J.A. Ortea & G. Pérez-Dionis, 2014 - (MARGINELLIDAE)
- swenneni, Protapes swenneni M. Huber, 2010 - (VENERIDAE)
- swerbiana, Clithon swerbiana C.A. Récluz, 1842 - syn of: Clithon faba (G.B. I Sowerby, 1836) - (NERITIDAE)
- swetti, Odostomia swetti A.M. Strong & L.G. Hertlein, 1939 - (PYRAMIDELLIDAE)
- swezeyi, Scaevogyra swezeyi R.P. Whitfield, 1878 † - (ONYCHOCHILIDAE) (FOSSIL)
- swickae, Serpulospira swickae Blodgett & Johnson, 1992 † - (EUOMPHALOIDEA (UNASSIGNED)) (FOSSIL)
- Swiftella, Subgenus Stoastomops (Swiftella) F.C. Baker, 1941 (HELICINIDAE)
- swifti, Colubraria swifti G.W. Tryon, 1881 - syn of: Monostiolum tessellatum (L.A. Reeve, 1844) - (COLUBRARIIDAE)
- swifti, Swiftopecten swifti (A.C. Bernardi, 1858) - (PECTINIDAE)
- swifti, Chondropoma swifti (R.J. Shuttleworth, 1854) - (POMATIIDAE)
- swifti, Triton swifti G.W. Tryon, 1881 - syn of: Monostiolum tessellatum (L.A. Reeve, 1844) - (RANELLIDAE)
- swifti, Haplocochlias swifti E.G. Vanatta, 1913 - (SKENEIDAE)
- swifti, Microceramus swifti (T.B. Bland, 1874) - (UROCOPTIDAE)
- swifti azuense, Chondropoma swifti azuense P. Bartsch, 1946 - (POMATIIDAE)
- swifti barahonense, Chondropoma swifti barahonense P. Bartsch, 1946 - (POMATIIDAE)
- swifti inequilabrum, Chondropoma swifti inequilabrum P. Bartsch, 1946 - (POMATIIDAE)
- swifti kindlei, Swiftopecten swifti kindlei (W.H. Dall, 1920 †) - (PECTINIDAE) (FOSSIL)
- swifti weinlandi, Chondropoma swifti weinlandi (L. Pfeiffer) - (POMATIIDAE)
- swiftiana, Caryocorbula swiftiana (C.B. Adams, 1852) - (CORBULIDAE)
- swiftiana, Corbula swiftiana C.B. Adams, 1852 - syn of: Caryocorbula swiftiana (C.B. Adams, 1852) - (CORBULIDAE)
- swiftiana, Epirobia swiftiana (J.C.H. Crosse, 1863) - (EPIROBIIDAE)
- swiftiana, Fadyenia swiftiana E. Chitty, 1857 - (HELICINIDAE)
- swiftiana, Varicella swiftiana H.A. Pilsbry - (OLEACINIDAE)
- swiftiana alternans, Epirobia swiftiana alternans F.G. Thompson, 1976 - (EPIROBIIDAE)
- swiftiana caribaea, Caryocorbula swiftiana caribaea A.V.M.D. D'Orbigny, 1845 - (CORBULIDAE)
- swiftianum, Chondropoma swiftianum (C.D. Weinland) - (POMATIIDAE)
- swiftianus, Obeliscus swiftianus (L. Pfeiffer, 1852) - (SUBULINIDAE)
- swiftii, Achatinella swiftii W. Newcomb - (ACHATINELLIDAE)
- swiftii, Dolabrifera swiftii H.A. Pilsbry, 1896 - syn of: Dolabrifera dolabrifera (P.C.A.S.L. Rang, 1828) - (APLYSIIDAE)
- swiftii, Cerion regina swiftii H.A. Pilsbry & E.G. Vanatta, 1895 - (CERIONIDAE)
- swiftii, Epitonium swiftii O.A.L. Mörch, 1875 - syn of: Epitonium krebsii (O.A.L. Mörch, 1875) - (EPITONIIDAE)
- swiftii, Turbonilla swiftii K.J. Bush, 1899 - syn of: Turbonilla penistoni K.J. Bush, 1899 - (PYRAMIDELLIDAE)
- swiftii chromatacme, Achatinella swiftii chromatacme H.A. Pilsbry & C.M. Cooke, 1914 - (ACHATINELLIDAE)
- swiftii echegoini, Decadopecten swiftii echegoini Anderson, 1905 † - syn of: Chlamys cosibensis M. Yokoyama, 1911 † - (PECTINIDAE) (FOSSIL)
- Swiftopecten, Genus Swiftopecten L.G. Hertlein, 1935 (PECTINIDAE)
- swindonensis, Corbicellopsis swindonensis Cox † - (TANCREDIIDAE) (FOSSIL)
- swinhoei, Nesiohelix swinhoei (L. Pfeiffer, 1865) - (BRADYBAENIDAE)
- swinhoei, Dolicheulota swinhoei (L. Pfeiffer, 1865) - (BRADYBAENIDAE)
- swinhoei, Formosana swinhoei (L. Pfeiffer, 1855) - (CLAUSILIIDAE)
- swinhoei, Dioryx swinhoei A. Adams, 1866 - (CYCLOPHORIDAE)
- swinhoei, Sinoennea swinhoei (A. Adams, 1866) - (DIAPHERIDAE)
- swinhoei, Dreissena swinhoei H. Adams, 1870 - syn of: Sinomytilus swinhoei (H. Adams, 1870) - (DREISSENIDAE)
- swinhoei, Radix swinhoei A. Adams, 1866 - syn of: Radix auricularia swinhoei A. Adams, 1866 - (LYMNAEIDAE)
- swinhoei, Radix auricularia swinhoei A. Adams, 1866 - (LYMNAEIDAE)
- swinhoei, Sinomytilus swinhoei (H. Adams, 1870) - (MYTILIDAE)
- swinhoei, Brotia swinhoei (C.B. Adams, 1870) - (PACHYCHILIDAE)
- swinhoei, Segmentina usta swinhoei A. Adams, 1866 - (PLANORBIDAE)
- swinhoei, Pupinella swinhoei (C.B. Adams, 1866) - (PUPINIDAE)
- swinhoei, Elma swinhoei (H.A. Pilsbry & Y. Hirase, 1905) - (STREPTAXIDAE)
- swinhoei depressus, Dioryx swinhoei depressus H.A. Pilsbry & Y. Hirase, 1906 - (CYCLOPHORIDAE)
- swinneni, Caecum swinneni I. Nofroni, M. Pizzini & M. Oliverio, 1997 - (CAECIDAE)
- swinneni, Calliostoma swinneni G.T. Poppe, S.P. Tagaro & H. Dekker, 2006 - (CALLIOSTOMATIDAE)
- swinneni, Mitrella swinneni D. Monsecour & D. Monsecour, 2011 - (COLUMBELLIDAE)
- swinneni, Africonus swinneni M.J. Tenorio, C.M.L. Afonso & al., 2014 - (CONIDAE)
- swinneni, Mitromorpha swinneni C. Mifsud, 2001 - (MITROMORPHIDAE)
- swinneni, Turbonilla swinneni A. Peñas & E. Rolán, 1997 - (PYRAMIDELLIDAE)
- swinneni, Spondylus swinneni K.L. Lamprell, J. Stanisic & P.S. Clarkson, 2001 - (SPONDYLIDAE)
- swinneni, Oxymeris swinneni Y. Terryn & P. Ryall, 2014 - (TEREBRIDAE)
- swobodai, Terebra swobodai T. Bratcher, 1981 - (TEREBRIDAE)
- swopei, Oreohelix swopei H.A. Pilsbry & J.H. Ferriss, 1917 - (OREOHELICIDAE)
- syabrubesiensis, Diplommatina syabrubesiensis Budha & Backeljau, 2017 - (DIPLOMMATINIDAE)
- syagrus, Mesopeplum syagrus (J. Marwick, 1924 †) - (PECTINIDAE) (FOSSIL)
- Syama, Genus Syama H.H. Godwin-Austen, 1908 (ARIOPHANTIDAE)
- syaskoi, Churkites syaskoi Zakharov & Y. Shigeta, 2004 † - syn of: Churkites egregius Zharnikova & Okuneva, 1990 † - (ARCTOCERATIDAE) (FOSSIL)
- sybaricata, Tellina sybaricata W.H. Dall, 1881 - syn of: Tellina sybaritica W.H. Dall, 1881 - (TELLINIDAE)
- sybaritica, Acmaea sybaritica W.H. Dall, 1871 - syn of: Erginus sybariticus (W.H. Dall, 1871) - (ACMAEIDAE)
- sybaritica, Clionella sybaritica P. Bartsch, 1915 - syn of: Clionella rosaria (L.A. Reeve, 1846) - (CLAVATULIDAE)
- sybaritica, Ambigua fuscolabiata sybaritica (W. Kobelt, 1906) - (HELICIDAE)
- sybaritica, Cernuella sybaritica W. Kobelt, 1907 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- sybaritica, Tellina sybaritica W.H. Dall, 1881 - (TELLINIDAE)
- sybariticum, Laevicardium sybariticum (W.H. Dall, 1886) - (CARDIIDAE)
- sybariticus, Erginus sybariticus (W.H. Dall, 1871) - (ACMAEIDAE)
- sybellina, Arjamannia sybellina (Billings, 1866 †) - (LOPHOSPIRIDAE) (FOSSIL)
- sybilla, Trochus sybilla Hudleston † - (TROCHIDAE) (FOSSIL)
- sybillae, Vexillum sybillae (J.C. Melvill, 1888) - (COSTELLARIIDAE)
- sybillae, Mitra sybillae J.C. Melvill, 1888 - syn of: Vexillum sybillae (J.C. Melvill, 1888) - (MITRIDAE)
- sybilloides, Amphitrochus sybilloides A.E.M. Cossmann, 1920 † - (NODODELPHINULIDAE) (FOSSIL)
- sybundulatum falcatum, Goniatites sybundulatum falcatum Frech, 1887 † - syn of: Falcitornoceras falcatum (Frech, 1887 †) - (GONIATITIDAE) (FOSSIL)
- Sychar, Genus Sychar R.B. Hinds, 1843 (TRIPHORIDAE)
- Sychnotropis, Subgenus Omphalotropis (Sychnotropis) O.F. von Möllendorff, 1898 (ASSIMINEIDAE)
- sychnum, Teinostoma sychnum W.P. Woodring, 1957 † - (TORNIDAE) (FOSSIL)
- sycilla, Felimare sycilla (L.S.R. Bergh, 1890) - (CHROMODORIDIDAE)
- Sycoceras, Genus Sycoceras Pictet, 1854 † (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- Sycodes, Genus Sycodes Gabb, 1868 † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Sycofulgur, Genus Sycofulgur Marks, 1950 † (BUSYCONIDAE) (FOSSIL)
- sycon, Diestoceras sycon Flower, 1952 † - (DIESTOCERATIDAE) (FOSSIL)
- sycophanta, Capulus sycophanta T.A. Garrard, 1961 - syn of: Capulus danieli (J.C.H. Crosse, 1858) - (CAPULIDAE)
- sycophanta, Turbonilla sycophanta (C.R. Laws, 1937 †) - (PYRAMIDELLIDAE) (FOSSIL)
- sycophantus, Theodoxus sycophantus (Š. Brusina, 1878 †) - (NERITIDAE) (FOSSIL)
- Sycopsis, Genus Sycopsis Conrad, 1867 † (BUSYCONIDAE) (FOSSIL)
- Sycospira, Genus Sycospira Palmer, 1953 † (VOLUTIDAE) (FOSSIL)
- Sycostoma, Genus Sycostoma L.R. Cox, 1931 † (MELONGENIDAE) (FOSSIL)
- Sycotypus, syn of: Subgenus Busycon (Busycotypus) W.A. Wenz, 1943 (BUSYCONIDAE)
- Sycotypus, syn of: Genus Ficus P.F. Röding, 1798 (FICIDAE)
- Syctopus, syn of: Genus Ficus P.F. Röding, 1798 (FICIDAE)
- Syctyphus, syn of: Genus Ficus P.F. Röding, 1798 (FICIDAE)
- Sydaphera, Subgenus Cancellaria (Sydaphera) T. Iredale, 1929 (CANCELLARIIDAE)
- sydariensis, Rutitrigonia sydariensis (Archangelski , 1916 †) - (RUTITRIGONIIDAE) (FOSSIL)
- sydariensis, Trigonia sydariensis Archangelski , 1916 † - syn of: Rutitrigonia sydariensis (Archangelski , 1916 †) - (TRIGONIIDAE) (FOSSIL)
- syderea, Angaria syderea (L.A. Reeve, 1843) - (ANGARIIDAE)
- Sydlorina, syn of: Genus Pillucina H.A. Pilsbry, 1921 (LUCINIDAE)
- sydneyensis, Aplysia sydneyensis G.B. II Sowerby, 1869 - (APLYSIIDAE)
- sydneyensis, Austroconus sydneyensis (G.B. III Sowerby, 1887) - (CONIDAE)
- sydneyensis, Ovatipsa sydneyensis F.A. Schilder & M. Schilder, 1938 - syn of: Ovatipsa chinensis amiges (J.C. Melvill & R. Standen, 1915) - (CYPRAEIDAE)
- sydneyensis, Divarilima sydneyensis (C. Hedley, 1904) - (LIMIDAE)
- sydneyensis, Lima sydneyensis C. Hedley, 1904 - syn of: Divarilima sydneyensis (C. Hedley, 1904) - (LIMIDAE)
- sydneyensis, Fossarus sydneyensis C. Hedley, 1900 - (PLANAXIDAE)
- syedra, Albinaria inauris syedra H. Nordsieck, 2004 - (CLAUSILIIDAE)
- syhadrensis, Cremnoconchus syhadrensis (W.T. Blanford, 1863) - (LITTORINIDAE)
- sykesi, Amastra sykesi A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- sykesi, Drymaeus sykesi S.I. Da Costa, 1906 - (BULIMULIDAE)
- sykesi, Amplirhagada sykesi (E.A. Smith, 1894) - (CAMAENIDAE)
- sykesi, Cerithium alucastrum sykesi Š. Brusina in W. Kobelt, 1908 - (CERITHIIDAE)
- sykesi, Chiton sykesi G.B. III Sowerby, 1903 - syn of: Leptochiton sykesi (G.B. III Sowerby, 1903) - (CHITONIDAE)
- sykesi, Chromodoris sykesi C.N.E. Eliot, 1904 - syn of: Goniobranchus albopunctatus A. Garrett, 1879 - (CHROMODORIDIDAE)
- sykesi, Leptocochlea sykesi (A.R.J.B. Bavay & P. Dautzenberg, 1899) - (CLAUSILIIDAE)
- sykesi, Pusia sykesi (J.C. Melvill, 1925) - (COSTELLARIIDAE)
- sykesi, Cryptoplax sykesi K.H.J. Thiele, 1909 - (CRYPTOPLACIDAE)
- sykesi, Palaina sykesi G.A. Solem, 1959 - (DIPLOMMATINIDAE)
- sykesi, Diplommatina sykesi H.C. Fulton, 1901 - (DIPLOMMATINIDAE)
- sykesi, Epitonium sykesi (J.C. Melvill & R. Standen, 1903) - (EPITONIIDAE)
- sykesi, Arculus sykesi (G.W. Chaster, 1895) - (LASAEIDAE)
- sykesi, Leptochiton sykesi (G.B. III Sowerby, 1903) - (LEPTOCHITONIDAE)
- sykesi, Cyclostrema sykesi P. Dautzenberg & H. Fischer, 1897 - (LIOTIIDAE)
- sykesi, Potamolithus sykesi H.A. Pilsbry, 1896 - (LITHOGLYPHIDAE)
- sykesi, Favartia sykesi (H.B. Preston, 1904) - (MURICIDAE)
- sykesi, Tortulosa sykesi (H.C. Fulton, 1904) - (PUPINIDAE)
- sykesi, Pyrgulina sykesi P. Dautzenberg & H. Fischer, 1906 - (PYRAMIDELLIDAE)
- sykesi, Quinnia sykesi (M.M. Schepman, 1909) - (SEGUENZIIDAE)
- sykesi, Discartemon sykesi (W.E. Collinge, 1902) - (STREPTAXIDAE)
- sykesi letrungthongi, Leptocochlea sykesi letrungthongi J. Grego & M. Szekeres, 2011 - (CLAUSILIIDAE)
- sykesi pontica, Cerithium sykesi pontica K.O. Milaschewitsch, 1916 - syn of: Cerithium alucastrum (G.B. Brocchi, 1814) - (CERITHIIDAE)
- Sykesia, syn of: Genus Ruthvenia G.P.L.K. Gude, 1911 (CHAROPIDAE)
- sykesii, Tornatellaria sykesii C.M. Cooke & H.A. Pilsbry, 1916 - (ACHATINELLIDAE)
- sykesii, Cerithiopsis sykesii J.C. Melvill, 1896 - (CERITHIOPSIDAE)
- sykesii, Clathurella sykesii J.C. Melvill & R. Standen, 1903 - syn of: Veprecula sykesii (J.C. Melvill & R. Standen, 1903) - (CLATHURELLIDAE)
- sykesii, Arculus sykesii G.W. Chaster, 1895 - syn of: Arculus sykesi (G.W. Chaster, 1895) - (LASAEIDAE)
- sykesii, Neolepton sykesii G.W. Chaster, 1895 - syn of: Arculus sykesi (G.W. Chaster, 1895) - (NEOLEPTONIDAE)
- sykesii, Turbonilla sykesii J.C. Melvill, 1910 - (PYRAMIDELLIDAE)
- sykesii, Veprecula sykesii (J.C. Melvill & R. Standen, 1903) - (RAPHITOMIDAE)
- sykesii, Truncatellina sykesii (J.C. Melvill & J.H. Ponsonby, 1893) - (VERTIGINIDAE)
- sykesii illibata, Tornatellaria sykesii illibata C.M. Cooke & H.A. Pilsbry, 1916 - (ACHATINELLIDAE)
- sylhetica, Corbicula sylhetica H.B. Preston, 1908 - (CYRENIDAE)
- sylheticus, Amphidromus sylheticus (L.A. Reeve, 1849) - (CAMAENIDAE)
- sylpha, Maclurites sylpha Billings, 1865 † - (MACLURITIDAE) (FOSSIL)
- syltensis, Nassarius syltensis (A.H.E. Beyrich, 1854 †) - (NASSARIIDAE) (FOSSIL)
- sylvae, Cernuella sylvae É.A.A. Locard, 1882 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- sylvaerupis, Metula sylvaerupis G.F. Harris, 1899 † - (BUCCINIDAE) (FOSSIL)
- sylvania, Humboldtiana sylvania F.G. Thompson & K. Mejia, 2005 - (HUMBOLDTIANIDAE)
- Sylvanocochlis, syn of: Genus Fulmentum P. Fischer, 1884 (PSEUDOLIVIDAE)
- sylvanum, Meekoceras sylvanum Smith, 1932 † - syn of: Meekoceras gracilitatis (White, 1879 †) - (MEEKOCERATIDAE) (FOSSIL)
- sylvanus, Dolichostyla virgata sylvanus (W.J. Broderip, 1841) - (BRADYBAENIDAE)
- Sylvanus, Genus Sylvanus M. Huber, Langleit & Kreipl, 2015 (TELLINIDAE)
- Sylvarion, Genus Sylvarion J.J. Van Mol, 1970 (UROCYCLIDAE)
- sylvatica, Leptocala sylvatica S. Putzeys, 1898 - (ACHATINIDAE)
- sylvatica, Strophiops sylvatica C.J. Maynard & W.F. Clapp, 1921 - (CERIONIDAE)
- sylvatica, Cepaea sylvatica J.P.R. Draparnaud, 1801 - syn of: Cepaea silvatica (J.P.R. Draparnaud, 1801) - (HELICIDAE)
- sylvatica, Helicina sylvatica D'Orbigny, 1837 - (HELICINIDAE)
- sylvatica, Pyrenaearia navasi sylvatica C.E. Prieto, 1991 - (HYGROMIIDAE)
- sylvatica unicolor, Leptocala sylvatica unicolor (C.B. Adams, 1849) - (ACHATINIDAE)
- sylvaticus, Obeliscus sylvaticus (J.B. von Spix, 1827) - (SUBULINIDAE)
- sylvesteri, Pacitrigonia sylvesteri J. Marwick, 1932 † - (TRIGONIIDAE) (FOSSIL)
- Sylvestria, Genus Sylvestria Heidelberger, 2001 † (OMPHALOTROCHIDAE) (FOSSIL)
- sylvestrina, Megalotachea sylvestrina (von Schlotheim, 1820 †) - (HELICIDAE) (FOSSIL)
- sylvestrina gottschicki, Megalotachea sylvestrina gottschicki (W.A. Wenz, 1919 †) - (HELICIDAE) (FOSSIL)
- sylvestris, Ena sylvestris S.E. Studer, 1789 - syn of: Ena montana (J.P.R. Draparnaud, 1801) - (ENIDAE)
- sylvestris, Hyolithes sylvestris Reed, 1909 † - syn of: Recilites sylvestris (Reed, 1909 †) - (HYOLITHIDAE) (FOSSIL)
- sylvestris, Oxychilus sylvestris P. Fagot & Nansouty, 1875 - syn of: Oxychilus cellarius (O.F. Müller, 1774) - (OXYCHILIDAE)
- sylvestris, Recilites sylvestris (Reed, 1909 †) - (PAUXILLITIDAE) (FOSSIL)
- sylvestris, Boreolestes sylvestris P.V. Kijashko, 1999 - (TRIGONOCHLAMYDIDAE)
- sylvestris, Zonitarion sylvestris G.A. de Mol, 1970 - (UROCYCLIDAE)
- Sylvestrosphaera, Genus Sylvestrosphaera Peel, 1980 † (SINUITIDAE) (FOSSIL)
- sylvia, Cavellia sylvia (F.W. Hutton, 1883) - (CHAROPIDAE)
- sylvia, Miniaceoliva miniacea sylvia (P.L. Duclos, 1835) - (OLIVIDAE)
- sylvia, Gulella sylvia (J.C. Melvill & J.H. Ponsonby, 1903) - (STREPTAXIDAE)
- sylviae, Amphidromus sylviae Stark, 2017 - (CAMAENIDAE)
- sylviaense, Argobuccinum sylviaense C.S. Weaver, 1912 - syn of: Fusitriton oregonensis (J.H. Redfield, 1846) - (RANELLIDAE)
- sylviaensis, Fusitriton sylviaensis C.S. Weaver, 1912 - syn of: Fusitriton oregonensis (J.H. Redfield, 1846) - (RANELLIDAE)
- sylvicola, Oxytesta sylvicola (W.T. Blanford) - (ARIOPHANTIDAE)
- sylvicola, Trachycystis sylvicola A.C. van Bruggen & B. Verdcourt, 1965 - (CHAROPIDAE)
- symatophorus, Paxyodon symatophorus L.R.L. Simone, 2006 - syn of: Prisodon syrmatophorus (J.F. Gmelin, 1791) - (HYRIIDAE)
- symbiophora, Borsonia symbiophora A.V. Sysoev, 1996 - (BORSONIIDAE)
- symbiotes, Borsonia symbiotes (J. Wood-Mason & A. Alcock, 1891) - (BORSONIIDAE)
- symbiotes, Comitas symbiotes J. Wood-Mason & A. Alcock, 1891 - syn of: Borsonia symbiotes (J. Wood-Mason & A. Alcock, 1891) - (PSEUDOMELATOMIDAE)
- symbiotes, Pleurotoma symbiotes J. Wood-Mason & A. Alcock, 1891 - syn of: Borsonia symbiotes (J. Wood-Mason & A. Alcock, 1891) - (TURRIDAE)
- symbiotes subcorpulenta, Borsonia symbiotes subcorpulenta (E.A. Smith, 1894) - (BORSONIIDAE)
- symbolica, Ctenocardia symbolica T. Iredale, 1929 - (CARDIIDAE)
- symbolica, Sydlorina symbolica T. Iredale, 1930 - syn of: Pillucina pisidium (R.W. Dunker, 1860) - (LUCINIDAE)
- symbolicum, Campanile symbolicum T. Iredale, 1917 - (CAMPANILIDAE)
- symbolicum, Ctenocardia symbolicum T. Iredale, 1929 - syn of: Ctenocardia virgo (L.A. Reeve, 1845) - (CARDIIDAE)
- symbolicus, Calliotrochus symbolicus T. Iredale, 1937 - syn of: Calliotrochus marmoreus (W.H. Pease, 1861) - (TROCHIDAE)
- symbolicus alter, Calliotrochus symbolicus alter T. Iredale, 1937 - syn of: Calliotrochus marmoreus (W.H. Pease, 1861) - (TROCHIDAE)
- symeonidisi, Viviparus symeonidisi Schütt, 1986 † - (VIVIPARIDAE) (FOSSIL)
- symetrica, Eglisia symetrica F.W. Hutton, 1873 - syn of: Stiracolpus symmetricus (F.W. Hutton, 1873) - (EPITONIIDAE)
- symius, Zonites rhodius symius G.J. Pfeffer, 1930 - (ZONITIDAE)
- symmetra, Valvata symmetra (Ludwig, 1865 †) - (VALVATIDAE) (FOSSIL)
- symmetrcia, Oxycypraea symmetrcia T.H. Aldrich, 1903 † - syn of: Oxycypraea symmetrica (T.H. Aldrich, 1903 †) - (EOCYPRAEIDAE) (FOSSIL)
- Symmetriapelta, Genus Symmetriapelta L.A. Beck, 1992 † (PELTOSPIRIDAE) (FOSSIL)
- symmetrica, Fontigens symmetrica A.A. Olsson & A. Harbison, 1953 - (AMNICOLIDAE)
- symmetrica, Barbatia symmetrica L.A. Reeve, 1844 - syn of: Striarca symmetrica (L.A. Reeve, 1844) - (ARCIDAE)
- symmetrica, Astarte symmetrica T.A. Conrad, 1834 † - (ASTARTIDAE) (FOSSIL)
- symmetrica, Astartella symmetrica C. Chen & al., 1974 † - (ASTARTIDAE) (FOSSIL)
- symmetrica, Ardeadoris symmetrica (W.B. Rudman, 1990) - (CHROMODORIDIDAE)
- symmetrica, Spirina symmetrica J. Perner, 1907 † - (CRASPEDOSTOMATIDAE) (FOSSIL)
- symmetrica, Crassatella symmetrica Weijden, 1943 - (CRASSATELLIDAE)
- symmetrica, Cyamiomactra symmetrica C.F. Laseron, 1953 - (CYAMIIDAE)
- symmetrica, Diplommatina symmetrica E.A. Smith, 1894 - syn of: Diplommatina gomantongensis E.A. Smith, 1894 - (DIPLOMMATINIDAE)
- symmetrica, Oxycypraea symmetrica (T.H. Aldrich, 1903 †) - (EOCYPRAEIDAE) (FOSSIL)
- symmetrica, Eulima symmetrica King, 1844 † - syn of: Meekospira symmetrica (King, 1844 †) - (EULIMIDAE) (FOSSIL)
- symmetrica, Scintilla symmetrica N.H. Odhner, 1919 - (GALEOMMATIDAE)
- symmetrica, Halobia symmetrica Smith, 1927 † - (HALOBIIDAE) (FOSSIL)
- symmetrica, Holopea symmetrica J.W. Hall, 1847 † - (HOLOPEIDAE) (FOSSIL)
- symmetrica, Planikellya symmetrica (G.P. Deshayes, 1858 †) - (LASAEIDAE) (FOSSIL)
- symmetrica, Elimata symmetrica C.O. Waterhouse, 1987 † - (LIMIDAE) (FOSSIL)
- symmetrica, Ctenoides symmetrica (K.H. Barnard, 1964) - (LIMIDAE)
- symmetrica, Mactra symmetrica L.A. Reeve, 1854 - syn of: Mactra petitii (A.V.M.D. D'Orbigny, 1846) - (MACTRIDAE)
- symmetrica, Pyrgocythara symmetrica (L.A. Reeve, 1846) - (MANGELIIDAE)
- symmetrica, Meekospira symmetrica (King, 1844 †) - (MEEKOSPIRIDAE) (FOSSIL)
- symmetrica, Monotis symmetrica A. Hyatt, 1894 † - syn of: Posidonotis semiplicata (A. Hyatt, 1894 †) - (MONOTIDAE) (FOSSIL)
- symmetrica, Thecodonta symmetrica H.A. Pilsbry, 1921 - (MONTACUTIDAE)
- symmetrica, Striarca symmetrica (L.A. Reeve, 1844) - (NOETIIDAE)
- symmetrica, Anculosa symmetrica S.S. Haldeman, 1841 - (PLEUROCERIDAE)
- symmetrica, Turritella symmetrica F.W. Hutton, 1873 - syn of: Stiracolpus symmetricus (F.W. Hutton, 1873) - (TURRITELLIDAE)
- symmetrica, Macromphalina symmetrica (H.A. Pilsbry & A.A. Olsson, 1945) - (VANIKORIDAE)
- symmetricum, Epitonium symmetricum (W.H. Pease, 1867) - (EPITONIIDAE)
- symmetricum, Pinacoceras symmetricum Mojsisovics, 1873 † - syn of: Paragymnites symmetricus (Mojsisovics, 1873 †) - (PINACOCERATIDAE) (FOSSIL)
- symmetricum, Platyceras symmetricum J.W. Hall, 1862 † - (PLATYCERATIDAE) (FOSSIL)
- symmetricus, Aviculopecten symmetricus F.S. Xu, 1980 † - syn of: Aviculopecten yunnanensis H. Guo, 1985 † - (AVICULOPECTINIDAE) (FOSSIL)
- symmetricus, Purpuriconus symmetricus (G.B. I Sowerby, 1850 †) - (CONIDAE) (FOSSIL)
- symmetricus, Conus symmetricus Sandberger, 1862 † - (CONIDAE) (FOSSIL)
- symmetricus, Paragymnites symmetricus (Mojsisovics, 1873 †) - (GYMNITIDAE) (FOSSIL)
- symmetricus, Palaeoneilo symmetricus Y. Fang, 1987 † - (MALLETIIDAE) (FOSSIL)
- symmetricus, Pernopecten symmetricus Newell, 1940 † - (PERNOPECTINIDAE) (FOSSIL)
- symmetricus, Gyraulus symmetricus (Sauerzopf, 1953 ) - (PLANORBIDAE)
- symmetricus, Cuyopsis symmetricus P. Sánchez, 1999 † - (PRAENUCULIDAE) (FOSSIL)
- symmetricus, Soleniscus symmetricus King, 1844 † - syn of: Meekospira symmetrica (King, 1844 †) - (SOLENISCIDAE) (FOSSIL)
- symmetricus, Stiracolpus symmetricus (F.W. Hutton, 1873) - (TURRITELLIDAE)
- symmetricus, Zeacolpus symmetricus F.W. Hutton, 1873 - syn of: Stiracolpus symmetricus (F.W. Hutton, 1873) - (TURRITELLIDAE)
- symmetricus, Microkerkus symmetricus (Craven, 1880) - (UROCYCLIDAE)
- symmetricus, Athleta symmetricus T.A. Conrad, 1854 † - (VOLUTIDAE) (FOSSIL)
- symmetricus domingensis, Purpuriconus symmetricus domingensis (Sowerby, 1849 †) - (CONIDAE) (FOSSIL)
- symmetricus semiobsoletus, Purpuriconus symmetricus semiobsoletus (C.J. Maury, 1917 †) - (CONIDAE) (FOSSIL)
- SYMMETROCAPULIDAE Wenz, 1938 † - Family (GASTROPODA-NERITIMORPHA [Subclass]-CYCLONERITIMORPHA [Order]-SYMMETROCAPULOIDEA [Superfamily]) (FOSSIL)
- Symmetrocapulus, Genus Symmetrocapulus Dacqué, 1934 † (SYMMETROCAPULIDAE) (FOSSIL)
- Symmetrogephyrus, syn of: Genus Amicula J.E. Gray, 1847 (MOPALIIDAE)
- Symmetromphalus, Genus Symmetromphalus J.H. McLean, 1990 (NEOMPHALIDAE)
- symmetros, Kellia symmetros J.G. Jeffreys, 1876 - syn of: Kelliola symmetros (J.G. Jeffreys, 1876) - (KELLIIDAE)
- symmetros, Kelliola symmetros (J.G. Jeffreys, 1876) - (MONTACUTIDAE)
- symmetros, Axinodon symmetros J.G. Jeffreys, 1876 - syn of: Kelliola symmetros (J.G. Jeffreys, 1876) - (MONTACUTIDAE)
- Symmorphomactra, syn of: Genus Simomactra W.H. Dall, 1894 (MACTRIDAE)
- symmrica, Arcopsis symmrica (L.A. Reeve, 1844 †) - (NOETIIDAE) (FOSSIL)
- symondsii, Ceromya symondsii P. Morris & J. Lycett, 1855 † - syn of: Ceratomya concentrica (J. de C. Sowerby, 1825 †) - (CERATOMYIDAE) (FOSSIL)
- symonense, Desmoceras symonense Böse, 1923 † - syn of: Pseudohaploceras liptoviense (Zeuschner, 1856 †) - (DESMOCERATIDAE) (FOSSIL)
- symonensis, Hoplites symonensis Böse, 1923 † - (HOPLITIDAE) (FOSSIL)
- symonensis, Olcostephanus symonensis Böse 1923 † - (OLCOSTEPHANIDAE) (FOSSIL)
- Sympharciceras, syn of: Genus Synpharciceras Schindewolf , 1940 † (PHARCICERATIDAE) (FOSSIL)
- symphenacis, Arca symphenacis P.G. Oliver & H.C.G. Chesney, 1994 - syn of: Arca navicularis J.G. Bruguière, 1789 - (ARCIDAE)
- Symphinota, syn of: Genus Potamilus C.S. Rafinesque, 1819 (UNIONIDAE)
- symphylla, Acirsa symphylla (E.C. Von Martens, 1878) - (EPITONIIDAE)
- Symphynota, syn of: Genus Potamilus C.S. Rafinesque, 1819 (UNIONIDAE)
- sympiesta, Kleinella sympiesta J.G. Jeffreys, 1883 - (PYRAMIDELLIDAE)
- symplector, Bathymargarites symplector A. Warén & P. Bouchet, 1989 - (SEGUENZIIDAE)
- Symplectoteuthis, syn of: Genus Sthenoteuthis A.E. Verrill, 1880 (OMMASTREPHIDAE)
- symplectum, Strigoceras symplectum (Buckman, 1924 †) - (STRIGOCERATIDAE) (FOSSIL)
- symplectus, Plectostrigites symplectus Buckman † - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- Sympolycyclus, Genus Sympolycyclus Spath , 1951 † (TRACHYCERATIDAE) (FOSSIL)
- Symptychia, syn of: Genus Tropidauchenia W.A. Lindholm, 1924 (CLAUSILIIDAE)
- Symptychiella, Genus Symptychiella H. Nordsieck, 1999 (CLAUSILIIDAE)
- synaniae, Melanopsis synaniae D. Esu & O. Girotti, 2015 † - (MELANOPSIDAE) (FOSSIL)
- Synapterpes, Genus Synapterpes H.A. Pilsbry, 1896 (SUBULINIDAE)
- Synapticola, syn of: Genus Devonia R. Winckworth, 1930 (MONTACUTIDAE)
- Synaptocochlea, Genus Synaptocochlea H.A. Pilsbry, 1890 (TROCHIDAE)
- synarmostes, Bothrocorbula synarmostes W.H. Dall, 1898 † - (CORBULIDAE) (FOSSIL)
- Synartinskia, Genus Synartinskia Ruzhencev , 1937 † (MEDLICOTTIIDAE) (FOSSIL)
- Syncera, syn of: Genus Assiminea J. Fleming, 1828 (ASSIMINEIDAE)
- SYNCERATIDAE - syn of Family: ASSIMINEIDAE
- Syncyclonema, Genus Syncyclonema Meek, 1864 † (ENTOLIIDAE) (FOSSIL)
- Syncyclonema, syn of: Genus Pectinella A.E. Verrill, 1897 (ENTOLIIDAE)
- SYNCYCLONEMATIDAE - syn of Family: ENTOLIIDAE
- SYNCYCLONEMIDAE - syn of Family: ENTOLIIDAE
- Syndesmia, syn of: Genus Abra J.B.P.A. Lamarck, 1818 (SEMELIDAE)
- Syndesmya, syn of: Genus Abra J.B.P.A. Lamarck, 1818 (SEMELIDAE)
- Syndesmyella, syn of: Genus Abra J.B.P.A. Lamarck, 1818 (SEMELIDAE)
- syndesmyoides, Macomopsis syndesmyoides (J.C. Melvill & R. Standen, 1907) - (TELLINIDAE)
- Syndomya, syn of: Genus Abra J.B.P.A. Lamarck, 1818 (SEMELIDAE)
- Syndosmia, syn of: Genus Abra J.B.P.A. Lamarck, 1818 (SEMELIDAE)
- Syndosmya, syn of: Genus Abra J.B.P.A. Lamarck, 1818 (SEMELIDAE)
- syndromoideus, Amphidromus syndromoideus Inkhavilay & S. Panha, 2017 - (CAMAENIDAE)
- Syndromus, syn of: Genus Amphidromus J.A. Albers, 1850 (CAMAENIDAE)
- Synek, syn of: Genus Palaeoneilo Hall & Whitfield, 1869 † (MALLETIIDAE) (FOSSIL)
- synekhes, Epitonium synekhes R.N. Kilburn, 1985 - (EPITONIIDAE)
- Synetoceras, Genus Synetoceras Zhuravleva, 1972 † (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- Syngastrioceras, Genus Syngastrioceras Librovitch , 1938 † (GLAPHYRITIDAE) (FOSSIL)
- syngenes, Borsonia syngenes (R.B. Watson, 1881) - (BORSONIIDAE)
- syngenes, Homalopoma syngenes K.H. Barnard, 1958 - (COLLONIIDAE)
- syngenes, Cylichna syngenes H.B. Preston, 1916 - (CYLICHNIDAE)
- syngenes, Helicina syngenes H.B. Preston, 1914 - (HELICINIDAE)
- syngenes, Siratus syngenes Finlay, 1930 † - (MURICIDAE) (FOSSIL)
- syngenes, Pupilla syngenes H.A. Pilsbry, 1890 - (PUPILLIDAE)
- syngenes, Alvania syngenes (A.E. Verrill, 1884) - (RISSOIDAE)
- Syngenochelus, Genus Syngenochelus † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Syngenoherpia, Genus Syngenoherpia L. Salvini-Plawén, 1978 (SYNGENOHERPIIDAE)
- SYNGENOHERPIIDAE Salvini-Plawen, 1978 - Family (SOLENOGASTRES-SOLENOGASTRES [Subclass]-CAVIBELONIA [Order])
- syngonum, Sandbergeroceras syngonum A.H. Clarke, 1897 † - (TRIAINOCERATIDAE) (FOSSIL)
- syngonus, Arcestes syngonus Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- Synjaella, Genus Synjaella Kanev, 1993 † (ANADONTELLIDAE) (FOSSIL)
- Synodontites, Genus Synodontites Pirona, 1867 † (HIPPURITIDA (UNASSIGNED)) (FOSSIL)
- Synopeas, Genus Synopeas Förster, 1856 (SUBULINIDAE)
- Synopeas, syn of: Genus Beckianum H.B. Baker, 1961 (SUBULINIDAE)
- synoria, Austropyrgus synoria A. Clark, W.B. Miller & W.F. Ponder, 2003 - (HYDROBIIDAE)
- Synpharciceras, Genus Synpharciceras Schindewolf , 1940 † (PHARCICERATIDAE) (FOSSIL)
- Synprosphyma, Genus Synprosphyma A. Wagner, 1920 (CLAUSILIIDAE)
- Syntagma, syn of: Genus Chauvetia T.A. de M. Monterosato, 1884 (BUCCINIDAE)
- Syntharella, syn of: Genus Nozeba T. Iredale, 1915 (IRAVADIIDAE)
- synthetica, Laternula synthetica J. Marwick, 1948 - syn of: Laternula laterna (J.B.P.A. Lamarck, 1818) - (LATERNULIDAE)
- Synthopsis, Genus Synthopsis C.F. Laseron, 1956 (CERITHIOPSIDAE)
- Syntoina, syn of: Genus Ligumia W.J. Swainson, 1840 (UNIONIDAE)
- syntoma, Tricolia syntoma W.P. Woodring, 1957 † - (PHASIANELLIDAE) (FOSSIL)
- Syntomodrillia, Genus Syntomodrillia W.P. Woodring, 1928 (DRILLIIDAE)
- syntomum, Uromitra syntomum W.P. Woodring, 1928 † - (COSTELLARIIDAE) (FOSSIL)
- Syntonia, syn of: Genus Ligumia W.J. Swainson, 1840 (UNIONIDAE)
- Syntoxia, syn of: Genus Ligumia W.J. Swainson, 1840 (UNIONIDAE)
- syntriculus, Bythinella syntriculus H.D. Boeters & G. Falkner, 2008 - (BYTHINELLIDAE)
- Synuraloceras, Genus Synuraloceras Rhuzhentzev, 1952 † (PARAGASTRIOCERATIDAE) (FOSSIL)
- Synwocklumeria, Genus Synwocklumeria Librovitch , 1957 † (WOCKLUMERIIDAE) (FOSSIL)
- syobata, Barbitonia arthritica syobata (S. Nomura & K.M. Hatai, 1937) - (BUCCINIDAE)
- syoichiroi, Epitonium syoichiroi H. Masahito & T. Habe, 1976 - (EPITONIIDAE)
- syorum, Epitonium syorum H. DuShane & J.H. McLean, 1968 - syn of: Epitonium shyorum H. DuShane & J.H. McLean, 1968 - (EPITONIIDAE)
- syowaensis, Marseniopsis syowaensis H. Numanami & T.A. Okutani, 1991 - (VELUTINIDAE)
- Sypharochiton, Genus Sypharochiton K.H.J. Thiele, 1893 (CHITONIDAE)
- syphax, Oscillopha syphax (Conquand 1854) † - (OSTREIDAE) (FOSSIL)
- syphax, Lopha syphax Coquand, 1854 † - (OSTREIDAE) (FOSSIL)
- syphnia, Albinaria turrita syphnia (O. Böttger, 1878) - (CLAUSILIIDAE)
- sypho, Nautilus sypho J.P.S. Grateloup, 1827 † - syn of: Aturia aturi (B. de Basterot, 1825 †) - (NAUTILIDAE) (FOSSIL)
- syphonellus, Murex syphonellus G. Bonelli in L.M.D. Bellardi & O.G. Michelotti, 1841 - syn of: Typhinellus labiatus (G.J. De Cristofori & G. Jan, 1832) - (MURICIDAE)
- Syphonia, syn of: Genus Sphenia W.H. Turton, 1822 (MYIDAE)
- Syphonophaedusa, syn of: Subgenus Oospira (Siphonophaedusa) W.A. Lindholm, 1924 (CLAUSILIIDAE)
- Syphonopyge, syn of: Genus Aplysia C. Linnaeus, 1767 (APLYSIIDAE)
- Syphonota, Genus Syphonota H. Adams & A. Adams, 1854 (APLYSIIDAE)
- Syphopatella, syn of: Genus Crepidula J.B.P.A. Lamarck, 1799 (CALYPTRAEIDAE)
- syra, Mitra syra W.H. Dall, 1915 † - (MITRIDAE) (FOSSIL)
- syracusana, Muticaria syracusana (R.A. Philippi, 1836) - (CLAUSILIIDAE)
- syracusana, Voluta syracusana J.F. Gmelin, 1791 - syn of: Pisania striata (J.F. Gmelin, 1791) - (VOLUTIDAE)
- syracusana neuteboomi, Muticaria syracusana neuteboomi J. Beckmann, 1990 - (CLAUSILIIDAE)
- syracusanum, Raphitoma syracusanum H.M.D. de Blainville, 1829 - syn of: Raphitoma cordieri (B.C.M. Payraudeau, 1826) - (RAPHITOMIDAE)
- syracusanus, Fusinus syracusanus (C. Linnaeus, 1758) - (FASCIOLARIIDAE)
- syracusanus, Murex syracusanus C. Linnaeus, 1758 - syn of: Fusinus syracusanus (C. Linnaeus, 1758) - (MURICIDAE)
- syracusanus abbreviata, Fusinus syracusanus abbreviata G.S. Coen, 1933 - syn of: Fusinus syracusanus (C. Linnaeus, 1758) - (FASCIOLARIIDAE)
- syracusanus fasciolarioides, Fusinus syracusanus fasciolarioides T.A. de M. Monterosato, 1878 - syn of: Fusinus syracusanus (C. Linnaeus, 1758) - (FASCIOLARIIDAE)
- syracusanus rissoianus, Fusinus syracusanus rissoianus É.A.A. Locard, 1892 - (FASCIOLARIIDAE)
- syracusanus rubra, Fusinus syracusanus rubra A. Scacchi, 1836 - (FASCIOLARIIDAE)
- syracusanus umbilicata, Fusinus syracusanus umbilicata G.S. Coen, 1922 - (FASCIOLARIIDAE)
- syracusense, Solenochilus syracusense Miller & al., 1933 † - (SOLENOCHILIDAE) (FOSSIL)
- syrdarjensis, Sainschandia syrdarjensis Martinson, 1990 † - (PSEUDOHYRIIDAE) (FOSSIL)
- Syrdenites, Genus Syrdenites Nassichuk & al., 1965 † (MEDLICOTTIIDAE) (FOSSIL)
- syrenosa, Helicella syrenosa G. Servain - syn of: Helicella itala (C. Linnaeus, 1758) - (HYGROMIIDAE)
- syrensis, Candidula syrensis (L. Pfeiffer, 1846) - (HYGROMIIDAE)
- syriaca, Bithynia syriaca Blanckenhorn, 1897 † - (BITHYNIIDAE) (FOSSIL)
- syriaca, Corbicula syriaca É.A.A. Locard, 1883 - syn of: Corbicula fluminalis (O.F. Müller, 1774) - (CYRENIDAE)
- syriaca, Pyrgula syriaca P.M. Pallary, 1930 - syn of: Pyrgula sieversi (O. Böttger, 1881) - (HYDROBIIDAE)
- syriaca, Monacha syriaca (C.G. Ehrenberg, 1831) - (HYGROMIIDAE)
- syriaca, Litorina syriaca R.A. Philippi, 1847 - syn of: Echinolittorina punctata (J.F. Gmelin, 1791) - (LITTORINIDAE)
- syriaca, Margaritana syriaca P.M. Pallary, 1929 - syn of: Margaritifera homsensis (I. Lea, 1865) - (MARGARITIFERIDAE)
- syriaca, Ostrea stentina syriaca P.M. Pallary, 1933 - (OSTREIDAE)
- syriaca, Costatella syriaca J. Germain, 1911 - syn of: Physella acuta (J.P.R. Draparnaud, 1805) - (PHYSIDAE)
- syriaca, Paracaprinula syriaca Piveteau, 1939 † - (PLAGIOPTYCHIDAE) (FOSSIL)
- syriaca, Vautrinia syriaca (Vautrin 1933) † - (RADIOLITIDAE) (FOSSIL)
- syriaca, Philbertia syriaca P.M. Pallary, 1938 - (RAPHITOMIDAE)
- syriaca, Bankia syriaca G.F. Roch, 1936 - syn of: Bankia carinata (J.E. Gray, 1827) - (TEREDINIDAE)
- syriaca, Dorateuthis syriaca H. Woodward, 1883 † - (TEUTHIDA (UNASSIGNED)) (FOSSIL)
- syriacensis, Lymnaea syriacensis J. Germain, 1921 - syn of: Stagnicola palustris (O.F. Müller, 1774) - (LYMNAEIDAE)
- syriacum, Caecum syriacum L. de Folin, 1869 - syn of: Caecum auriculatum L. de Folin, 1868 - (CAECIDAE)
- syriacum, Cerithium syriacum P.M. Pallary, 1938 - syn of: Cerithium lividulum A. Risso, 1826 - (CERITHIIDAE)
- syriacum, Knemiceras syriacum (Von Buch, 1848 †) - (KNEMICERATIDAE) (FOSSIL)
- syriacum strigosa, Cerithium syriacum strigosa P.M. Pallary, 1938 - syn of: Cerithium lividulum A. Risso, 1826 - (CERITHIIDAE)
- syriacus, Conus syriacus P.F. Röding, 1798 - syn of: Lindaconus spurius (J.F. Gmelin, 1791) - (CONIDAE)
- syriacus, Conus syriacus G.B. I Sowerby, 1833 - syn of: Gradiconus regularis (G.B. I Sowerby, 1833) - (CONIDAE)
- syriacus, Pene syriacus (L. Pfeiffer, 1846) - (ENIDAE)
- syriacus, Lymnaea syriacus A. Mousson, 1861 - syn of: Stagnicola palustris (O.F. Müller, 1774) - (LYMNAEIDAE)
- syriacus, Theodoxus syriacus (J.R. Bourguignat, 1852) - (NERITIDAE)
- syriacus, Oxychilus syriacus W. Kobelt, 1878 - (OXYCHILIDAE)
- syringa, Cypraea syringa J.C. Melvill, 1888 - syn of: Cypraea pantherina J. Lightfoot, 1786 - (CYPRAEIDAE)
- syringianus, Siphonochelus syringianus (C. Hedley, 1903) - (MURICIDAE)
- Syringoceras, Genus Syringoceras Hyatt, 1894 † (SYRINGONAUTILIDAE) (FOSSIL)
- SYRINGONAUTILIDAE Mojsisovics, 1902 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-NAUTILIDA [Order]-TRIGONOCERATOIDEA [Superfamily]) (FOSSIL)
- Syringonautilus, Genus Syringonautilus Mojsisovics, 1902 † (SYRINGONAUTILIDAE) (FOSSIL)
- syrinx, Poirieria syrinx B.A. Marshall & R. Houart, 1995 - (MURICIDAE)
- Syrinx, Genus Syrinx P.F. Röding, 1798 (TURBINELLIDAE)
- Syrionautilus, Genus Syrionautilus Spath, 1927 † (CYMATOCERATIDAE) (FOSSIL)
- Syrioplanorbis, Genus Syrioplanorbis F.C. Baker, 1945 (PLANORBIDAE)
- syrjanicum, Gephyroceras syrjanicum Holzapfel, 1899 † - syn of: Uchtites syrjanicus (Holzapfel, 1899 †) - (GEPHUROCERATIDAE) (FOSSIL)
- syrjanicus, Uchtites syrjanicus (Holzapfel, 1899 †) - (PONTICERATIDAE) (FOSSIL)
- syrmatophora, Mya syrmatophora J.F. Gmelin, 1791 - syn of: Prisodon syrmatophorus (J.F. Gmelin, 1791) - (MYIDAE)
- syrmatophorus, Prisodon syrmatophorus (J.F. Gmelin, 1791) - (HYRIIDAE)
- syrmatophorus complanatus, Prisodon syrmatophorus complanatus L.H. Hupé, 1857 - syn of: Prisodon syrmatophorus (J.F. Gmelin, 1791) - (HYRIIDAE)
- syrmica, Pyrgula syrmica Š. Brusina, 1892 † - (HYDROBIIDAE) (FOSSIL)
- syrmica, Hydrobia syrmica M. von Neumayr in M. von Neumayr & C.R.C. Paul, 1875 † - (HYDROBIIDAE) (FOSSIL)
- syrmicus, Valenciennius syrmicus Stevanovic, 1990 † - (LYMNAEIDAE) (FOSSIL)
- Syrnola, Genus Syrnola A. Adams, 1860 (PYRAMIDELLIDAE)
- syrnoliformis, Ptycheulimella syrnoliformis (S. Nomura, 1938) - (PYRAMIDELLIDAE)
- Syrnolina, Subgenus Tropeas (Syrnolina) W.H. Dall & P. Bartsch, 1904 (PYRAMIDELLIDAE)
- syrnoloides, Eulimella syrnoloides A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- syrnoloides, Odostomia syrnoloides J.C. Melvill, 1896 - (PYRAMIDELLIDAE)
- Syrnolopsis, Genus Syrnolopsis E.A. Smith, 1880 (PALUDOMIDAE)
- Syrofontana, Genus Syrofontana H. Schütt, 1983 (HYDROBIIDAE)
- Syrotrigonia, Subgenus Buchotrigonia (Syrotrigonia) Cox, 1952 (BUCHOTRIGONIIDAE) (FOSSIL)
- syrphetodes, Mammilla syrphetodes R.N. Kilburn, 1976 - (NATICIDAE)
- Syrreghmatoceras, Genus Syrreghmatoceras Sverbilova, 1957 † (RUTOCERATIDAE) (FOSSIL)
- syrtale, Placenticeras syrtale (Morton, 1834 †) - (PLACENTICERATIDAE) (FOSSIL)
- syrtensis, Colus syrtensis (A. Packard, 1867) - (BUCCINIDAE)
- syrtensis, Stauroteuthis syrtensis A.E. Verrill, 1879 - (CIRROTEUTHIDAE)
- syrtensis, Turbonilla syrtensis J.J. Van Aartsen, 1981 - (PYRAMIDELLIDAE)
- syrtensis, Raphitoma linearis syrtensis F. Nordsieck, 1977 - (RAPHITOMIDAE)
- syrthica, Cerithium vulgatum syrthica T.A. de M. Monterosato, 1917 - (CERITHIIDAE)
- syrti, Hoplites syrti Pavlov, 1886 † - syn of: Aulacostephanoceras kirghisensis (A.V.M.D. D'Orbigny, 1845 †) - (HOPLITIDAE) (FOSSIL)
- syrtiaca, Mitrella syrtiaca P.M. Pallary, 1908 - syn of: Mitrella scripta (C. Linnaeus, 1758) - (COLUMBELLIDAE)
- syrtica, Cardita syrtica A.E.M. Cossmann & M.A. Peyrot, 1912 † - (CARDITIDAE) (FOSSIL)
- syrtica, Stagnicola syrtica (M.A. Peyrot, 1932 †) - (LYMNAEIDAE) (FOSSIL)
- syrtica, Rissoina syrtica A.E.M. Cossmann & M.A. Peyrot, 1919 † - (RISSOINIDAE) (FOSSIL)
- syrticum, Cerastoderma glaucum syrticum G.S. Coen, 1915 - (CARDIIDAE)
- syrticus, Murex syrticus C. Mayer, 1871 † - (MURICIDAE) (FOSSIL)
- syrticus, Nassarius syrticus M.A. Peyrot, 1924 † - (NASSARIIDAE) (FOSSIL)
- syrtites, Odostomia syrtites H.A. Pilsbry, 1918 - syn of: Miralda scopulorum (R.B. Watson, 1886) - (PYRAMIDELLIDAE)
- sysoevi, Horaiclavus sysoevi C. Smriglio & P. Mariottini, 2003 - (HORAICLAVIDAE)
- sysoevi, Teretia sysoevi M. Morassi & A. Bonfitto, 2015 - (RAPHITOMIDAE)
- sysoievi, Loculitheca sysoievi (Meshkova, 1974 †) - (TURCUTHECIDAE) (FOSSIL)
- Syssitomya, Genus Syssitomya Oliver, 2012 (MONTACUTIDAE)
- syssollae, Arctica syssollae (Keyserling 1846) † - (ARCTICIDAE) (FOSSIL)
- Systellomphalis, syn of: Subgenus Solariorbis (Systellomphalus) Pilsbry & Olsson, 1941 † (TORNIDAE) (FOSSIL)
- Systellomphalus, Subgenus Solariorbis (Systellomphalus) Pilsbry & Olsson, 1941 † (TORNIDAE) (FOSSIL)
- systemanaturae, Gulella systemanaturae A.C. van Bruggen, 2008 - (STREPTAXIDAE)
- Systenope, Subgenus Pleurotomella (Systenope) A.E.M. Cossmann, 1889 † (RAPHITOMIDAE) (FOSSIL)
- Systenostoma, syn of: Genus Tonkinospira A.R.J.B. Bavay & P. Dautzenberg, 1909 (HYPSELOSTOMATIDAE)
- systremma, Cylindrobulla systremma J.C. Melvill, 1918 - (CYLINDROBULLIDAE)
- systropha, Systrophia systropha (J.A. Albers, 1854) - (SCOLODONTIDAE)
- Systrophia, Genus Systrophia L. Pfeiffer, 1855 (SCOLODONTIDAE)
- Systrophiella, Subgenus Systrophia (Systrophiella) F.C. Baker, 1925 (SCOLODONTIDAE)
- SYSTROPHIIDAE - syn of Family: SCOLODONTIDAE
- Systrophoceras, Genus Systrophoceras Hyatt, 1894 † (LECHRITROCHOCERATIDAE) (FOSSIL)
- syungokannoi, Calliostoma syungokannoi S. Kosuge, 1998 - (CALLIOSTOMATIDAE)
- syzranicum, Russanovia syzranicum (Pavlow & Lamplugh, 1892 †) - (POLYPTYCHITIDAE) (FOSSIL)
- syzranicus, Viviparus syzranicus (Pavlov, 1925 †) - (VIVIPARIDAE) (FOSSIL)
- syzygia, Trivellona syzygia L. Dolin, 2001 - (TRIVIIDAE)
- Szaboella, Genus Szaboella Bandel & Riedel, 1994 (POTAMIDIDAE) (FOSSIL)
- szarowskae, Bythinella szarowskae P. Glöer, 2013 - (BYTHINELLIDAE)
- szarowskae, Bythiospeum szarowskae P. Glöer, J. Grego, Z. Eröss & Z. Fehér, 2015 - (HYDROBIIDAE)
- szechenyii, Costatoria szechenyii (Loczy, 1899 †) - (MYOPHORIIDAE) (FOSSIL)
- szechuanense, Pseudogastrioceras szechuanense Chao, 1965 † - (PARAGASTRIOCERATIDAE) (FOSSIL)
- szechuanensis, Phaedusa szechuanensis H.A. Pilsbry, 1934 - (CLAUSILIIDAE)
- szechwanensis, Cyclophorus szechwanensis T.C. Yen, 1939 - (CYCLOPHORIDAE)
- szekeresi, Argna szekeresi A. Reischütz, N. steiner-reischütz & P.L. Reischütz, 2016 - (ARGNIDAE)
- szekeresi, Liparophaedusa szekeresi Thach, 2017 - (CLAUSILIIDAE)
- szekeresi, Angustopila szekeresi B. Páll-Gergely & A. Hunyadi, 2015 - (HYPSELOSTOMATIDAE)
- szekeresi, Gudeodiscus giardi szekeresi B. Páll-Gergely & A. Hunyadi, 2013 - (PLECTOPYLIDAE)
- szekeresi, Vitrea szekeresi T. Deli & P. Subai, 2011 - (PRISTILOMATIDAE)
- Szekeresia, syn of: Genus Bellardiella Tapparone Canefri, 1883 (PUPINIDAE)
- szemiani, Donax szemiani C.H. Oostingh, 1931 - (DONACIDAE)
- szentei, Crestaites szentei Kovács, 2009 † - (HAMMATOCERATIDAE) (FOSSIL)
- Szentgalya, syn of: Genus Monacha L.I. Fitzinger, 1833 (HYGROMIIDAE)
- szigethyae, Lehmannia szigethyae A. Wiktor, 1975 - (LIMACIDAE)
- szigethyannae, Acicula szigethyannae P. Subai, 1977 - (ACICULIDAE)
- szinnyeiana, Succinea szinnyeiana J. Hazay, 1881 - syn of: Succinella oblonga (J.P.R. Draparnaud, 1801) - (SUCCINEIDAE)
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