- sihotealinica, Lymnaea sihotealinica N.D. Kruglov & Y.I. Starobogatov, 1984 - (LYMNAEIDAE)
- sihotealinica, Parajuga sihotealinica L.A. Prozorova & Y.I. Starobogatov, 2004 - (SEMISULCOSPIRIDAE)
- sihotealinica, Amuranodonta sihotealinica F. Zatrawkin & Y.I. Starobogatov, 1984 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- sikamea, Crassostrea sikamea (Amemiya, 1928) - (OSTREIDAE)
- sikanianum, Protrachyceras sikanianum McLearn, 1930 † - (TRACHYCERATIDAE) (FOSSIL)
- sikarae, Corbicula sikarae W.H. Dall, 1903 - syn of: Corbicula madagascariensis E.A. Smith, 1882 - (CYRENIDAE)
- sikatunai, Zeadmete sikatunai A. Verhecken, 2011 - (CANCELLARIIDAE)
- sikatunai, Gemmula sikatunai B.M. Olivera, 2004 - (TURRIDAE)
- sikeensis, Isabellaria sikeensis H. Nordsieck, 1984 - syn of: Graeca campylauchen sikeensis H. Nordsieck, 1984 - (CLAUSILIIDAE)
- sikeensis, Graeca campylauchen sikeensis H. Nordsieck, 1984 - (CLAUSILIIDAE)
- sikeensis spiralifera, Graeca sikeensis spiralifera H. Nordsieck, 2007 - syn of: Graeca campylauchen spiralifera H. Nordsieck, 2007 - (CLAUSILIIDAE)
- sikesi, Drillia sikesi H.B. Preston, 1908 - (DRILLIIDAE)
- sikkimensis, Parreysia sikkimensis I. Lea, 1859 - (UNIONIDAE)
- sikorae, Ampelita sikorae C.M.F. Ancey, 1891 - (ACAVIDAE)
- sikorae, Corbicula sikorae C.M.F. Ancey, 1890 - syn of: Corbicula madagascariensis E.A. Smith, 1882 - (CYRENIDAE)
- sikorai, Melanopsis sikorai Š. Brusina, 1903 † - syn of: Microcolpia parreyssii sikorai (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- sikorai, Microcolpia parreyssii sikorai (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- sikorai hazayi, Microcolpia parreyssii sikorai hazayi (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- sikorai megaotyla, Melanopsis sikorai megaotyla Š. Brusina, 1903 † - syn of: Microcolpia parreyssii sikorai (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- sikorai siminina, Melanopsis sikorai siminina Š. Brusina, 1903 † - syn of: Microcolpia parreyssii sikorai (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- sikorai tothi, Microcolpia parreyssii sikorai tothi (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- sikorai vidovici, Microcolpia parreyssii sikorai vidovici (Š. Brusina, 1903 †) - (MELANOPSIDAE) (FOSSIL)
- sikus, Saloceras sikus Cichowolski & al., 2015 † - (EOTHINOCERATIDAE) (FOSSIL)
- silabra, Euryentome silabra K.V.W. Palmer, 1937 † - (MARGINELLIDAE) (FOSSIL)
- silacea, Emoda silacea (P.M.A. Morelet, 1849) - (HELICINIDAE)
- silanica, Cochlodina silanica J.R. Bourguignat, 1877 - syn of: Cochlodina laminata (G. Montagu, 1803) - (CLAUSILIIDAE)
- silanica, Monachoides silanica J.R. Bourguignat - syn of: Perforatella incarnata (O.F. Müller, 1774) - (HYGROMIIDAE)
- Silberlingeria, Genus Silberlingeria Waterhouse , 1999 † (LONGOBARDITIDAE) (FOSSIL)
- silberlingi, Paracrochordiceras silberlingi Bucher, 1989 † - (ACROCHORDICERATIDAE) (FOSSIL)
- silberlingi, Bakevellia silberlingi Boyd & Newell, 2002 † - (BAKEVELLIIDAE) (FOSSIL)
- silberlingi, Platycuccoceras silberlingi Bucher, 1992 † - (BALATONITIDAE) (FOSSIL)
- silberlingi, Hollandites silberlingi Bucher, 1992 † - (BEYRICHITIDAE) (FOSSIL)
- silberlingi, Anaflemingites silberlingi Kummel & Steele, 1962 † - (FLEMINGITIDAE) (FOSSIL)
- silberlingi, Groenlandites silberlingi Tozer, 1994 † - (LONGOBARDITIDAE) (FOSSIL)
- silberlingi, Pseudaspidites silberlingi Jenks & al., 2010 † - (PROPTYCHITIDAE) (FOSSIL)
- silberlingi, Discamphiceras silberlingi Guex, 1980 † - (PSILOCERATIDAE) (FOSSIL)
- silberlingi, Trachyceras silberlingi Balini & al., 2012 † - (TRACHYCERATIDAE) (FOSSIL)
- silberlingi, Anatropites silberlingi Tozer, 1994 † - (TROPITIDAE) (FOSSIL)
- Silberlingia, syn of: Genus Silberlingitoides Monnet & Bucher, 2006 † (CERATITIDAE) (FOSSIL)
- Silberlingites, Genus Silberlingites Bucher , 1989 † (SIBIRITIDAE) (FOSSIL)
- Silberlingitoides, Genus Silberlingitoides Monnet & Bucher, 2006 † (CERATITIDAE) (FOSSIL)
- silbo, Akera silbo J.A. Ortea & L. Moro, 2009 - (AKERIDAE)
- silencioensis, Tetragonites silencioensis Ifrim & al. 2013 † - (TETRAGONITIDAE) (FOSSIL)
- sileni, Plekocheilus sileni H.H. Beck, 1837 - (AMPHIBULIMIDAE)
- sileni, Orthonychia sileni Oehlert, 1883 † - (ORTHONYCHIIDAE) (FOSSIL)
- Silenia, syn of: Genus Cetoconcha W.H. Dall, 1889 (CETOCONCHIDAE)
- silensis, Cochlodina silensis N. Pini, 1884 - syn of: Cochlodina laminata (G. Montagu, 1803) - (CLAUSILIIDAE)
- silensis, Hemicycla glyceia silensis Cavero, 1988 - (HELICIDAE)
- Silenticeras, Genus Silenticeras McLearn , 1930 † (TRACHYCERATIDAE) (FOSSIL)
- silentiensis, Modiolus silentiensis McLearn, 1926 † - (MYTILIDAE) (FOSSIL)
- silentiensis, Pecten silentiensis McLearn, 1926 † - (PECTINIDAE) (FOSSIL)
- silenus, Chloritis silenus (G.F. Angas, 1873) - (CAMAENIDAE)
- silenus, Turbo silenus Laube, 1869 † - syn of: Wortheniella canalifera (Münster, 1841 †) - (TURBINIDAE) (FOSSIL)
- silesiaca, Anahamulina silesiaca (Uhlig, 1883 †) - (ANAHAMULINIDAE) (FOSSIL)
- silesiaca, Trolliella silesiaca H. Nordsieck, 1981 † - (CLAUSILIIDAE) (FOSSIL)
- silesiaca, Stabilea costata silesiaca (A. Schmidt, 1868) - (CLAUSILIIDAE)
- silesiaca, Duvalia silesiaca Uhlig, 1902 † - (DUVALIIDAE) (FOSSIL)
- silesiaca, Glatziella silesiaca Renz, 1925 † - (GLATZIELLIDAE) (FOSSIL)
- silesiaca, Hamulina silesiaca Uhlig, 1883 † - syn of: Anahamulina silesiaca (Uhlig, 1883 †) - (HAMULINIDAE) (FOSSIL)
- silesiaca, Cycloclymenia helenae silesiaca Renz, 1914 † - (PHENACOCERATIDAE) (FOSSIL)
- silesiaca, Tihkia silesiaca Skawina & Dzik, 2011 † - (SILESUNIONIDAE) (FOSSIL)
- silesiaca, Roseana silesiaca A. Korniushin, 1991 - syn of: Pisidium globulare C.A. Westerlund & S. Clessin, 1873 - (SPHAERIIDAE)
- silesiacum, Eoheteroceras silesiacum Vasícek & Wiedmann, 1994 † - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- silesiacum, Holcophylloceras silesiacum (Oppel, 1865 †) - (PHYLLOCERATIDAE) (FOSSIL)
- silesiacum, Leptoceras silesiacum Uhlig, 1883 † - syn of: Toxoceratoides silesiacus (Uhlig, 1883 †) - (PROTANCYLOCERATIDAE) (FOSSIL)
- silesiacus, Toxoceratoides silesiacus (Uhlig, 1883 †) - (ANCYLOCERATIDAE) (FOSSIL)
- silesiacus, Agalactochilus silesiacus (Andreae, 1902) † - (HELICIDAE) (FOSSIL)
- silesiacus, Pseudarietites silesiacus Frech, 1902 † - (PSEUDARIETITIDAE) (FOSSIL)
- Silesites, Genus Silesites Uhlig , 1883 † (SILESITIDAE) (FOSSIL)
- SILESITIDAE Hyatt, 1900 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-DESMOCERATOIDEA [Superfamily]) (FOSSIL)
- Silesitoides, Genus Silesitoides Spath, 1925 † (SILESITIDAE) (FOSSIL)
- silesui, Odostomia silesui I. Nofroni, 1988 - (PYRAMIDELLIDAE)
- Silesunio, Genus Silesunio Skawina & Dzik, 2011 (SILESUNIONIDAE) (FOSSIL)
- SILESUNIONIDAE Skawina & Dzik, 2011 † - Family (BIVALVIA-PALAEOHETERODONTA [Subclass]-UNIONIDA [Order]-SILESUNIONOIDEA [Superfamily]) (FOSSIL)
- siletzensis, Cancellaria siletzensis G.D. Hanna, 1924 † - (CANCELLARIIDAE) (FOSSIL)
- sileusi, Odostomia sileusi I. Nofroni, 1988 - syn of: Odostomia silesui I. Nofroni, 1988 - (PYRAMIDELLIDAE)
- Silex, syn of: Genus Solecurtus H.M.D. De Blainville, 1824 (SOLECURTIDAE)
- silhouettae, Silhouettia silhouettae (E.C. Von Martens, 1898) - (STREPTAXIDAE)
- silhouettanus, Pachnodes silhouettanus J.J. Van Mol & G. Coppois, 1980 - (CERASTUIDAE)
- silhouettensis, Glabrennea silhouettensis B. Verdcourt, 1994 - (STREPTAXIDAE)
- Silhouettia, Genus Silhouettia J. Gerlach & S.M. Van Bruggen, 1999 (STREPTAXIDAE)
- silicata, Lyria silicata W.H. Dall, 1915 † - (VOLUTIDAE) (FOSSIL)
- silicatus, Dermomurex silicatus Darragh, 2017 † - (MURICIDAE) (FOSSIL)
- silicea, Borsonia silicea (R.B. Watson, 1881) - (BORSONIIDAE)
- silicea, Euxinolauria silicea A.A. Schileyko, 1975 - (LAURIIDAE)
- silicea, Pleurotoma silicea R.B. Watson, 1881 - syn of: Borsonia silicea (R.B. Watson, 1881) - (TURRIDAE)
- siliceus, Hemisinus siliceus J. Brown & H.A. Pilsbry, 1914 † - (THIARIDAE) (FOSSIL)
- silicicola, Comitas silicicola Darragh, 2017 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- silicifluvia, Marginella silicifluvia W.H. Dall, 1916 † - (MARGINELLIDAE) (FOSSIL)
- silicifluvia, Pitar silicifluvia W.H. Dall, 1916 † - (VENERIDAE) (FOSSIL)
- silicina, Patella silicina P.F. Röding, 1798 - syn of: Patella caerulea C. Linnaeus, 1758 - (PATELLIDAE)
- silicius, Pyramus silicius C.O. Waterhouse, 1978 † - (MEGADESMIDAE) (FOSSIL)
- silicula, Mactra silicula L.A. Reeve, 1854 - syn of: Mactrotoma compressa (L. Spengler, 1802) - (MACTRIDAE)
- silicula, Mactrotoma silicula L.A. Reeve, 1854 - syn of: Mactrotoma compressa (L. Spengler, 1802) - (MACTRIDAE)
- silicula, Mactra silicula G.P. Deshayes, 1855 - syn of: Mactrotoma angulifera (L.A. Reeve, 1854) - (MACTRIDAE)
- silicula, Modiola silicula J.B.P.A. Lamarck, 1819 - syn of: Botula cinnamomeus (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- silicula, Nuculana silicula (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (NUCULANIDAE)
- silicula, Martesia silicula É. Lamy, 1921 - syn of: Martesia striata (C. Linnaeus, 1758) - (PHOLADIDAE)
- silicula, Pholas silicula J.B.P.A. Lamarck, 1818 - syn of: Barnea candida (C. Linnaeus, 1758) - (PHOLADIDAE)
- silicula, Juga silicula (A.A. Gould, 1848) - (SEMISULCOSPIRIDAE)
- Silicula, Genus Silicula J.G. Jeffreys, 1879 (SILICULIDAE)
- silicula infra, Botula silicula infra T. Iredale, 1939 - syn of: Botula cinnamomeus (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- silicula rudens, Juga silicula rudens Unknown - (SEMISULCOSPIRIDAE)
- SILICULIDAE Allen & Sanders, 1973 - Family (BIVALVIA-PROTOBRANCHIA [Subclass]-NUCULANIDA [Order]-NUCULANOIDEA [Superfamily])
- silicuosa, Mycetopoda silicuosa J.B. von Spix, 1827 - syn of: Mycetopoda siliquosa (J.B. von Spix, 1827) - (MYCETOPODIDAE)
- silifkeensis, Turcozonites silifkeensis H.P.M.G. Menkhorst & F. Riedel, 1995 - (ZONITIDAE)
- siligo, Abida siligo J.R. Roth, 1855 - syn of: Abida secale (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- siligo, Zemitrella siligo T.A. Okutani, 1964 - (COLUMBELLIDAE)
- siligo, Limatula siligo Fleming, 1978 - (LIMIDAE)
- silinae, Goniasma silinae Licharev, 1975 † - syn of: Orthonema silinae (Licharev, 1975 †) - (GONIASMATIDAE) (FOSSIL)
- silinae, Orthonema silinae (Licharev, 1975 †) - (ORTHONEMATIDAE) (FOSSIL)
- silinoensis, Plesiotriton silinoensis A. Verhecken, 2011 - (CANCELLARIIDAE)
- siliqua, Gervillella siliqua (Eudes-Deslongchamps †) - (BAKEVELLIIDAE) (FOSSIL)
- siliqua, Donax siliqua A. Römer, 1870 - (DONACIDAE)
- siliqua, Cyrtodaria siliqua (L. Spengler, 1793) - (HIATELLIDAE)
- siliqua, Nipponomysella siliqua (K.H. Barnard, 1964) - (MONTACUTIDAE)
- siliqua, Mya siliqua L. Spengler, 1793 - syn of: Cyrtodaria siliqua (L. Spengler, 1793) - (MYIDAE)
- siliqua, Nucula siliqua L.A. Reeve, 1855 - syn of: Portlandia arctica (Gray, 1824) - (NUCULIDAE)
- Siliqua, Genus Siliqua J.K. Megerle Von Mühlfeld, 1811 (PHARIDAE)
- siliqua, Ensis siliqua (C. Linnaeus, 1758) - (PHARIDAE)
- siliqua, Soletellina siliqua L.A. Reeve, 1857 - syn of: Hiatula nitida (J.E. Gray, 1843) - (PSAMMOBIIDAE)
- siliqua, Hiatula siliqua H.H. Suter, 1913 - syn of: Hiatula siliquens (R.C. Willan, 1993) - (PSAMMOBIIDAE)
- siliqua, Solen siliqua C. Linnaeus, 1758 - syn of: Ensis siliqua (C. Linnaeus, 1758) - (SOLENIDAE)
- siliqua, Macoma siliqua (C.B. Adams, 1852) - (TELLINIDAE)
- siliqua, Tellina siliqua C.B. Adams, 1852 - syn of: Macoma siliqua (C.B. Adams, 1852) - (TELLINIDAE)
- siliqua, Anodonta siliqua H.C. Küster, 1853 - syn of: Pseudanodonta elongata (J.J.J. Holandre, 1836) - (UNIONIDAE)
- siliqua, Tivelina siliqua A.A. Olsson, 1928 † - (VENERIDAE) (FOSSIL)
- siliqua, Venerupis siliqua G.P. Deshayes, 1854 - syn of: Irus reflexus (J.E. Gray, 1843) - (VENERIDAE)
- siliqua minor, Ensis siliqua minor J.C. Chenu, 1843 - syn of: Ensis minor (J.C. Chenu, 1843) - (PHARIDAE)
- siliqua minor, Solen siliqua minor J.C. Chenu, 1843 - syn of: Ensis minor (J.C. Chenu, 1843) - (SOLENIDAE)
- siliqua spectri, Macoma siliqua spectri L.G. Hertlein & Strong, 1949 - syn of: Macoma hesperus W.H. Dall, 1908 - (TELLINIDAE)
- Siliquara, syn of: Genus Tenagodus J.É. Guettard, 1770 (SILIQUARIIDAE)
- Siliquaria, syn of: Genus Tenagodus J.É. Guettard, 1770 (SILIQUARIIDAE)
- SILIQUARIIDAE Anton, 1838 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-CERITHIOIDEA [Superfamily])
- Siliquarius, syn of: Genus Tenagodus J.É. Guettard, 1770 (SILIQUARIIDAE)
- siliquens, Hiatula siliquens (R.C. Willan, 1993) - (PSAMMOBIIDAE)
- siliquiformis, Unio siliquiformis É.A.A. Locard, 1889 - syn of: Unio pictorum (C. Linnaeus, 1758) - (UNIONIDAE)
- Siliquimya, Genus Siliquimya Morris, Dickins & Astafieva-Urbaitis, 1991 † (ANOMALODESMATA (UNASSIGNED)) (FOSSIL)
- siliquoidea, Lampsilis siliquoidea D.W. Barnes, 1823 - syn of: Lampsilis radiata siliquoidea D.W. Barnes, 1823 - (UNIONIDAE)
- siliquoidea, Lampsilis radiata siliquoidea D.W. Barnes, 1823 - (UNIONIDAE)
- siliquosa, Mycetopoda siliquosa (J.B. von Spix, 1827) - (MYCETOPODIDAE)
- siliquosa, Solen siliquosa É.A.A. Locard, 1886 - syn of: Ensis siliqua (C. Linnaeus, 1758) - (SOLENIDAE)
- siliquosa pittieri, Mycetopoda siliquosa pittieri W.B. Marshall, 1928 - syn of: Mycetopoda pittieri Marshall, 1927 - (MYCETOPODIDAE)
- siliquosa studingeri, Mycetopoda siliquosa studingeri C.T. Simpson, 1914 - syn of: Mycetopoda siliquosa (J.B. von Spix, 1827) - (MYCETOPODIDAE)
- silistrensis, Turricula promensis silistrensis E.W. Vredenburg, 1921 - (CLAVATULIDAE)
- silivreni, Minastirithella silivreni Jacquet & P. Brock, 2016 † - (HELCIONELLOIDEA (UNASSIGNED)) (FOSSIL)
- siljanense, Discoceras siljanense Kröger & al., 2011 † - (DISCOCERATIDAE) (FOSSIL)
- Siljanoceras, Genus Siljanoceras Kröger , 2013 † (URANOCERATIDAE) (FOSSIL)
- silki, Astarte silki G. Høpner Petersen, 2001 - syn of: Astarte borealis (H.C.F. Schumacher, 1817) - (ASTARTIDAE)
- sillaensis, Limadora garciana sillaensis (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- sillana, Odostomia sillana W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- sillapaytensis, Pollia sillapaytensis A.A. Olsson, 1930 † - (BUCCINIDAE) (FOSSIL)
- sillarensis, Granaria sillarensis C. Piersanti, 1927 - syn of: Granaria variabilis (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- sillimani, Epitonium sillimani Morton, 1834 † - (EPITONIIDAE) (FOSSIL)
- sillimani, Oxyloma sillimani (T.B. Bland, 1865) - (SUCCINEIDAE)
- sillyonensis, Sprattia sillyonensis H. Nordsieck, 1994 - (CLAUSILIIDAE)
- sillyonensis candirensis, Sprattia sillyonensis candirensis H. Nordsieck, 2004 - (CLAUSILIIDAE)
- siloensis, Xerotricha siloensis A. Ortiz De Zárate, 1950 - syn of: Xerotricha silosensis A. Ortiz De Zárate, 1950 - (HYGROMIIDAE)
- silosensis, Xerotricha silosensis A. Ortiz De Zárate, 1950 - (HYGROMIIDAE)
- Siluracmaea, Genus Siluracmaea Horný , 1961 † (YOCHELSONIIDAE) (FOSSIL)
- siluriana, Mytilarca siluriana Reed, 1927 † - (AMBONYCHIIDAE) (FOSSIL)
- silurica, Bucaniella silurica d'Eichwald, 1840 † - syn of: Tetranota silurica (d'Eichwald, 1840 †) - (BELLEROPHONTIDAE) (FOSSIL)
- silurica, Dystactella silurica (Leljedahl, 1984 †) - (CTENODONTIDAE) (FOSSIL)
- silurica, Loxoplocus silurica (d'Eichwald, 1840 †) - (LOPHOSPIRIDAE) (FOSSIL)
- silurica, Tetranota silurica (d'Eichwald, 1840 †) - (PLECTONOTIDAE) (FOSSIL)
- silurica, Janeia silurica Liljedahl 1984 † - (SOLEMYIDAE) (FOSSIL)
- Silurina, Genus Silurina Barrande 1881 (ANTIPLEURIDAE) (FOSSIL)
- Silurinka, Genus Silurinka Kríž, 2005 † (AMBONYCHIIDAE) (FOSSIL)
- Siluriphorus, Genus Siluriphorus Cossmann, 1918 † (PSEUDOPHORIDAE) (FOSSIL)
- Silurozodus, Genus Silurozodus Liliedahl, 1994 † (SCHIZODIDAE) (FOSSIL)
- silvacollina, Americardia silvacollina D.T. Dockery, 1982 † - (CARDIIDAE) (FOSSIL)
- silvae, Oestophora silvae A. Ortiz De Zárate, 1962 - (TRISSEXODONTIDAE)
- silvaepluvialis, Kimberleytrachia silvaepluvialis F. Criscione & F. Köhler, 2015 - (CAMAENIDAE)
- silvaevagus, Naesiotus silvaevagus W.K. Weyrauch, 1960 - (BULIMULIDAE)
- silvaevagus, Obeliscus silvaevagus W.K. Weyrauch, 1964 - (SUBULINIDAE)
- silvai, Acteonella silvai C.J. Maury, 1925 † - (ACTEONELLIDAE) (FOSSIL)
- silvai, Pyrgiscus silvai B.M. Landau & P.I. LaFollette, 2015 - (PYRAMIDELLIDAE)
- silvai, Unio silvai É.A.A. Locard, 1899 - syn of: Unio abrantesianus É.A.A. Locard, 1899 - (UNIONIDAE)
- silvai, Anodonta silvai J. Da Silva e Castro, 1883 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- silvana, Megalotachea silvana (E. Klein, 1853 †) - (HELICIDAE) (FOSSIL)
- silvana, Cepaea silvana W.A. Wenz, 1923 † - syn of: Megalotachea silvana (E. Klein, 1853 †) - (HELICIDAE) (FOSSIL)
- silvana, Scurria silvana (Ramirez-Bohme, 1974) - (LOTTIIDAE)
- silvana, Collisella silvana J. Ramírez-Böhme, 1974 - syn of: Scurria variabilis (G.B. I Sowerby, 1839) - (LOTTIIDAE)
- silvana, Collisella silvana R. Ramírez, 1974 - syn of: Scurria variabilis (G.B. I Sowerby, 1839) - (LOTTIIDAE)
- silvanae, Duplicaria silvanae (U. Aubry, 1999) - (TEREBRIDAE)
- silvanense, Vascoceras silvanense Choffat, 1898 † - (VASCOCERATIDAE) (FOSSIL)
- silvanus, Drymaeus silvanus A. Zilch, 1953 - (BULIMULIDAE)
- silvardi, Reticunassa silvardi (H.H. Kool & H. Dekker, 2006 †) - (NASSARIIDAE) (FOSSIL)
- silvatica, Cepaea silvatica (J.P.R. Draparnaud, 1801) - (HELICIDAE)
- silvatica, Parachondria silvatica G.T. Watters, 2016 - (POMATIIDAE)
- silvatica, Chondropomorus silvatica MANCA 2016 - - syn of: Parachondria silvatica G.T. Watters, 2016 - (POMATIIDAE)
- silvaticum, Ennea silvaticum H.A. Pilsbry, 1919 - (STREPTAXIDAE)
- silvaticus, Arion silvaticus H. Lohmander, 1937 - syn of: Carinarion circumscriptus (G. Johnston, 1828) - (ARIONIDAE)
- silvaticus, Nipponochloritis silvaticus H. Minato, 1989 - (CAMAENIDAE)
- silvaticus, Hexaplex silvaticus K.V.W. Palmer, 1937 † - (MURICIDAE) (FOSSIL)
- silverdalensis, Cunearca silverdalensis Kellum, 1926 † - (ARCIDAE) (FOSSIL)
- silverdalensis, Miocenebra silverdalensis (E.H. Vokes, 1963 †) - (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- silveri, Glyptorhagada silveri (G.F. Angas, 1868) - (CAMAENIDAE)
- silverthorni, Capulus silverthorni Smith, 1927 † - (CAPULIDAE) (FOSSIL)
- silvestri, Nematurella silvestri D. Pantanelli, 1877 † - (HYDROBIIDAE) (FOSSIL)
- silvestri, Chrysallida silvestri A. Aradas & L. Benoit, 1870 - syn of: Chrysallida emaciata (Š. Brusina, 1866) - (PYRAMIDELLIDAE)
- silvestrii, Murella nebrodensis silvestrii (C. Cafici, 1885) - (HELICIDAE)
- silvestris, Helix silvestris C.A. Westerlund, 1886 - syn of: Chilostoma pouzolzi montenegrina (E.A. Rossmässler, 1836) - (HELICIDAE)
- silvestris, Saccella silvestris (Cotter, 1923 †) - (NUCULANIDAE) (FOSSIL)
- silviae, Synthopsis silviae A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- silviae, Seila silviae A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- silviae, Africonus silviae T. Cossignani, 2014 - (CONIDAE)
- silviae, Vexillum silviae H. Turner, S. Gori & R. Salisbury, 2007 - (COSTELLARIIDAE)
- silviae, Belgrandia silviae E. Rolán & Á. De Oliveira, 2009 - (HYDROBIIDAE)
- silviae, Mitra silviae H. Turner, 2007 - (MITRIDAE)
- silviae, Gundolficeras silviae Becker, 1995 † - (TORNOCERATIDAE) (FOSSIL)
- silvicola, Azeca silvicola L. Benoit, 1882 - syn of: Azeca goodalli (A.E.J. Férussac, 1821) - (COCHLICOPIDAE)
- silvicola, Diplommatina silvicola H.H. Godwin-Austen, 1884 - (DIPLOMMATINIDAE)
- silvicola, Robertsiella silvicola S.W. Attwood, Lokman & P.S. Ong, 2005 - (POMATIOPSIDAE)
- silvicola, Organocoptis integra silvicola C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- silviesi, Dubariceras silviesi (L.G. Hertlein, 1925 †) - (EODEROCERATIDAE) (FOSSIL)
- Silvigulella, Subgenus Gulella (Silvigulella) H.A. Pilsbry, 1919 (STREPTAXIDAE)
- silvii, Asmunda silvii E. Saurin, 1959 - (PYRAMIDELLIDAE)
- sima, Astarte sima J. Gardner, 1926 † - (ASTARTIDAE) (FOSSIL)
- sima, Benthobia sima L.R.L. Simone, 2003 - (BENTHOBIIDAE)
- sima, Mitrella sima Gardner, 1947 † - (COLUMBELLIDAE) (FOSSIL)
- Simacia, Genus Simacia Pocta, 1889 † (MONOPLEURIDAE) (FOSSIL)
- simaensis, Satsuma japonica simaensis J.T. Kuroda & T. Habe, 1991 - (CAMAENIDAE)
- simaki, Cyrtodiscus simaki Horný, 1997 † - (SINUITIDAE) (FOSSIL)
- Simancyloceras, Genus Simancyloceras Kemper, 1973 † (AEGOCRIOCERATIDAE) (FOSSIL)
- simanenkoi, Anasibirites simanenkoi Zakharov & Smyshlyaeva, 2013 † - (MELAGATHICERATIDAE) (FOSSIL)
- simanense, Pseudamussium simanense J.T. Kuroda, 1931 - syn of: Parvamussium alaskensis (W.H. Dall, 1871) - (PECTINIDAE)
- simanense, Parvamussium simanense J.T. Kuroda, 1931 - syn of: Parvamussium alaskensis (W.H. Dall, 1871) - (PROPEAMUSSIIDAE)
- simanoki, Kioconus recluzianus simanoki M.J. Tenorio, G.T. Poppe & S.P. Tagaro, 2007 - (CONIDAE)
- simanoki, Margistrombus simanoki V. Liverani, 2013 - (STROMBIDAE)
- simardense, Simardoceras simardense (Flower, 1952 †) - (WESTONOCERATIDAE) (FOSSIL)
- Simardoceras, Genus Simardoceras Flower, 1957 † (WESTONOCERATIDAE) (FOSSIL)
- Simaspidoceras, Genus Simaspidoceras Spath, 1925 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- simazirianus, Brachytoma simazirianus S. Nomura & N. Zinbo, 1936 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- simba, Cratena simba M. Edmunds, 1970 - (FACELINIDAE)
- simbaiana, Gervillia simbaiana Skwarko, 1967 † - (MYALINIDAE) (FOSSIL)
- simbaiana, Spia simbaiana Skwarko 1967 † - (PTERIIDA (UNASSIGNED)) (FOSSIL)
- simbergi, Archaeosphera simbergi Heidelberger, 2001 † - (OMPHALOTROCHIDAE) (FOSSIL)
- simbirskense, Australiceras simbirskense (Sinzow, 1872 †) - (ANCYLOCERATIDAE) (FOSSIL)
- simbirskensis, Gibboscala simbirskensis Blagovetshenskiy, 2015 † - (EPITONIIDAE) (FOSSIL)
- simbirskensis, Nesisoteuthis simbirskensis Doguzhaeva, 2005 † - (TEUTHIDA (UNASSIGNED)) (FOSSIL)
- Simbirskites, Genus Simbirskites Pavlow , 1891 † (POLYPTYCHITIDAE) (FOSSIL)
- simbla, Margarites simbla W.H. Dall, 1913 - (MARGARITIDAE)
- simboana, Dendrotrochus cineraceus simboana (E.A. Smith, 1885) - (HELICARIONIDAE)
- simemacula, Megastomia simemacula (C.R. Laws, 1940 †) - (PYRAMIDELLIDAE) (FOSSIL)
- simeni, Parvedentulina simeni (E. Fischer-Piette, Ch.P. Blanc, F. Blanc & F. Salvat, 1994) - (STREPTAXIDAE)
- simense, Mosquoceras simense Ruzhentsev & Shimanskiy, 1954 † - (MOSQUOCERATIDAE) (FOSSIL)
- simense, Uraloceras simense Ruzhentsev, 1951 † - (PARAGASTRIOCERATIDAE) (FOSSIL)
- simense, Pseudorthoceras simense Shimanskiy, 1954 † - (PSEUDORTHOCERATIDAE) (FOSSIL)
- simensis, Microdoma simensis Jakowlew 1899 † - (MICRODOMATIDAE) (FOSSIL)
- simeri, Volvarina simeri F.P. Jousseaume, 1875 - syn of: Volvarina exilis (J.F. Gmelin, 1791) - (MARGINELLIDAE)
- simesi, Anabarella simesi MacKinnon, 1985 † - (STENOTHECIDAE) (FOSSIL)
- simia, Leptaxis simia (A.E.J. Férussac, 1832) - (HYGROMIIDAE)
- simia, Malletia simia J. Marwick, 1931 † - (MALLETIIDAE) (FOSSIL)
- Simia, syn of: Genus Simnia A. Risso, 1826 (OVULIDAE)
- simia advenoides, Leptaxis simia advenoides (C.de Paiva, 1867) - (HYGROMIIDAE)
- simia hyaena, Leptaxis simia hyaena (R.T. Lowe, 1852) - (HYGROMIIDAE)
- simia portosancti, Leptaxis simia portosancti (T.V. Wollaston, 1878) - (HYGROMIIDAE)
- simiae, Mammilla simiae (G.P. Deshayes, 1838) - (NATICIDAE)
- simiae, Polinices simiae G.P. Deshayes, 1838 - syn of: Mammilla simiae (G.P. Deshayes, 1838) - (NATICIDAE)
- simiae, Natica simiae G.P. Deshayes, 1838 - syn of: Mammilla simiae (G.P. Deshayes, 1838) - (NATICIDAE)
- Simicheiloceras, Genus Simicheiloceras Becker, 1993 † (TORNOCERATIDAE) (FOSSIL)
- Simichelloceras, syn of: Genus Simicheiloceras Becker, 1993 † (TORNOCERATIDAE) (FOSSIL)
- simici, Staja simici (P.S. Pavlovic, 1903 †) - (HYDROBIIDAE) (FOSSIL)
- simiensis, Albinaria brevicollis simiensis K.L. Pfeiffer, 1955 - (CLAUSILIIDAE)
- simiensis, Propustularia simiensis (R.N. Nelson, 1925 †) - (CYPRAEIDAE) (FOSSIL)
- simiensis, Hercoglossa simiensis E.H. Vokes, 1937 † - (HERCOGLOSSIDAE) (FOSSIL)
- simiensis, Tellina simiensis R.N. Nelson, 1925 † - (TELLINIDAE) (FOSSIL)
- simiensis, Pitar simiensis (R.N. Nelson, 1925 †) - (VENERIDAE) (FOSSIL)
- simii, Truncatellina simii C. De Stefani, 1883 - syn of: Truncatellina callicratis (A. Scacchi, 1833) - (VERTIGINIDAE)
- similans, Lienardia grayi similans W.H. Turton, 1932 - (CLATHURELLIDAE)
- similans, Helminthoglypta similans G.D. Hanna & A.G. Smith, 1937 - (HELMINTHOGLYPTIDAE)
- similans, Turbonilla similans E.A. Smith, 1903 - (PYRAMIDELLIDAE)
- similare, Calliostoma similare L.A. Reeve, 1863 - syn of: Astele similaris (L.A. Reeve, 1863) - (CALLIOSTOMATIDAE)
- similare, Naticonema similare J. Perner, 1903 † - (PLATYCERATIDAE) (FOSSIL)
- similaria, Strophiops similaria C.J. Maynard & W.F. Clapp, 1921 - (CERIONIDAE)
- similaris, Strobilus subtilis similaris C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- similaris, Amastra similaris W.H. Pease, 1870 - (AMASTRIDAE)
- similaris, Bradybaena similaris (A.E.J. Férussac, 1821) - (BRADYBAENIDAE)
- similaris, Drymaeus similaris S. Moricand, 1856 - (BULIMULIDAE)
- similaris, Astele similaris (L.A. Reeve, 1863) - (CALLIOSTOMATIDAE)
- similaris, Calliostoma similaris L.A. Reeve, 1863 - syn of: Astele similaris (L.A. Reeve, 1863) - (CALLIOSTOMATIDAE)
- similaris, Mexichromis similaris (W.B. Rudman, 1986) - (CHROMODORIDIDAE)
- similaris, Hemiphaedusa similaris (A. Adams, 1873) - (CLAUSILIIDAE)
- similaris, Philonesia similaris H.B. Baker, 1940 - (EUCONULIDAE)
- similaris, Helix similaris A.E.J. Férussac - syn of: Bradybaena similaris (A.E.J. Férussac, 1821) - (HELICIDAE)
- similaris, Limatula similaris (W.H. Dall, 1908) - (LIMIDAE)
- similaris, Euvaricella similaris (H.A. Pilsbry, 1907) - (OLEACINIDAE)
- similaris, Naticonema similaris J. Perner, 1903 † - (PLATYCERATIDAE) (FOSSIL)
- similaris, Copulabyssia similaris K. Hasegawa, 1997 - (PSEUDOCOCCULINIDAE)
- similaris, Miraradula similaris (H. Strebel, 1882) - (SPIRAXIDAE)
- similaris, Lamprotula similaris (C.T. Simpson, 1900) - (UNIONIDAE)
- similaris, Archivesica similaris (T.A. Okutani, S. Kojima & J. Ashi, 1997) - (VESICOMYIDAE)
- similaris, Calyptogena similaris T.A. Okutani, S. Kojima & J. Ashi, 1997 - syn of: Archivesica similaris (T.A. Okutani, S. Kojima & J. Ashi, 1997) - (VESICOMYIDAE)
- similaris arundinetorum, Bradybaena similaris arundinetorum (P.M. Heude, 1890) - (BRADYBAENIDAE)
- similaris assimilaris, Bradybaena similaris assimilaris (P.V. Gredler, 1878) - (BRADYBAENIDAE)
- similaris gramineum, Bradybaena similaris gramineum (P.M. Heude, 1890) - (BRADYBAENIDAE)
- similaris hongkongensis, Bradybaena similaris hongkongensis G.P. Deshayes, 1873 - (BRADYBAENIDAE)
- similaris mandevillensis, Varicella similaris mandevillensis H.A. Pilsbry, 1907 - syn of: Euvaricella similaris (H.A. Pilsbry, 1907) - (OLEACINIDAE)
- similaris nigra, Hemiphaedusa similaris nigra (H. Minato & A. Tada, 1977) - (CLAUSILIIDAE)
- similaris sloaneana, Varicella similaris sloaneana H.A. Pilsbry, 1909 - syn of: Euvaricella similaris (H.A. Pilsbry, 1907) - (OLEACINIDAE)
- similaris stimpsoni, Bradybaena similaris stimpsoni L. Pfeiffer, 1854 - (BRADYBAENIDAE)
- similaris ventriosa, Hemiphaedusa similaris ventriosa (P.B. Schmacker & O. Böttger, 1891) - (CLAUSILIIDAE)
- similas, Cyclas similas J.B. Burch, 1975 - syn of: Sphaerium simile T. Say, 1817 - (SPHAERIIDAE)
- simile, Calliostoma simile (J. de C. Sowerby, 1818 ) - (CALLIOSTOMATIDAE)
- simile, Parvicardium simile (Milaschewisch, 1909) - (CARDIIDAE)
- simile, Cardium simile K.O. Milaschewitsch, 1909 - syn of: Papillicardium papillosum (G.S. Poli, 1791) - (CARDIIDAE)
- simile, Dentalium simile Münster, 1841 † - (DENTALIIDAE) (FOSSIL)
- simile, Opisthostoma simile J.J. Vermeulen, 1994 - (DIPLOMMATINIDAE)
- simile, Acutimitoceras simile Vöhringer, 1960 † - (GATTENDORFIIDAE) (FOSSIL)
- simile, Pseudoschistoceras simile Teichert, 1944 † - (METALEGOCERATIDAE) (FOSSIL)
- simile, Eutrephoceras simile E. Forbes, 1846 † - syn of: Eutrephoceras dorbignyanum (E. Forbes, 1846 †) - (NAUTILIDAE) (FOSSIL)
- simile, Proniceras simile Spath, 1950 † - (OLCOSTEPHANIDAE) (FOSSIL)
- simile, Ovulum simile G.B. II Sowerby, 1848 - syn of: Simnia avena (G.B. II Sowerby, 1832) - (OVULIDAE)
- simile, Phragmoceras simile Hedstrom, 1917 † - (PHRAGMOCERATIDAE) (FOSSIL)
- simile, Stenotrema simile F.W. Grimm, 1971 - (POLYGYRIDAE)
- simile, Sphaerium simile T. Say, 1817 - (SPHAERIIDAE)
- simile, Aulatornoceras simile (Giebel, 1852 †) - (TORNOCERATIDAE) (FOSSIL)
- simile, Aulatornoceras simile (F.A. Roemer, 1850 †) - (TORNOCERATIDAE) (FOSSIL)
- simile, Globonema simile (Ulrich & Scofield, 1897 †) - (TROCHONEMATIDAE) (FOSSIL)
- simile, Spirostemma simile (C.B. Adams, 1849) - (UROCOPTIDAE)
- similebala, Eulimella similebala A. Peñas & E. Rolán, 1999 - (PYRAMIDELLIDAE)
- simileulimella, Turbonilla simileulimella A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- similicentrifuga, Tawera similicentrifuga (J.M.R.M. Viader, 1951) - (VENERIDAE)
- Similiconcha, Genus Similiconcha Zhang, 1977 † (NUCULIDAE) (FOSSIL)
- similidroueti, Trophonopsis similidroueti (R. Houart, 1989) - (MURICIDAE)
- Simililyria, syn of: Genus Callipara J.E. Gray, 1847 (VOLUTIDAE)
- similimus, Tomelasmus irroratus similimus C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- similior, Synthopsis similior A. Cecalupo & I. Perugia, 2013 - (CERITHIOPSIDAE)
- similior, Melanella similior P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- similior, Donaldiella similior Endo, 1935 † - syn of: Donaldiella cicelia (Billings, 1865 †) - (LOPHOSPIRIDAE) (FOSSIL)
- similior, Similiphora similior (P. Bouchet & H. Guillemot, 1978) - (TRIPHORIDAE)
- Similipecten, Genus Similipecten R. Winckworth, 1932 (PROPEAMUSSIIDAE)
- Similiphora, Genus Similiphora P. Bouchet, 1985 (TRIPHORIDAE)
- similiris, Yoldiella similiris J.A. Allen, A. Sanders & G. Hannah, 1995 - (YOLDIIDAE)
- similis, Achatina similis C.B. Adams, 1850 - syn of: Euvaricella biplicatula dissimilis (H.A. Pilsbry, 1909) - (ACHATINIDAE)
- similis, Platyla similis O.W.H. Reinhardt, 1880 - (ACICULIDAE)
- similis, Ammonites similis C.T. Simpson, 1843 † - syn of: Eleganticeras elegantulum A.T. Young & Bird, 1828 † - (AMMONITIDA (unassigned)) (FOSSIL)
- similis, Ammonites similis Giebel, 1852 † - syn of: Aulatornoceras simile (Giebel, 1852 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- similis, Amalda similis (G.B. II Sowerby, 1859) - (ANCILLARIIDAE)
- similis, Carbonicola similis (J. Brown, 1843 †) - (ANTHRACOSIIDAE) (FOSSIL)
- similis, Anadara similis (C.B. Adams, 1852) - (ARCIDAE)
- similis, Tortarctica similis (J. de C. Sowerby 1825) † - (ARCTICIDAE) (FOSSIL)
- similis, Armina similis C.N.E. Eliot, 1913 - (ARMINIDAE)
- similis, Assiminea similis (W. Baird, 1873) - (ASSIMINEIDAE)
- similis, Fictonoba similis (C.R. Laws, 1950 †) - (BARLEEIIDAE) (FOSSIL)
- similis, Sphenosphaera similis (Ulrich & Scofield, 1897 †) - (BELLEROPHONTIDAE) (FOSSIL)
- similis, Phragmolites similis Ulrich & Scofield, 1897 † - syn of: Phragmolites compressus T.A. Conrad, 1838 † - (BUCANIIDAE) (FOSSIL)
- similis, Conradella similis T.A. Conrad, 1838 † - syn of: Phragmolites compressus T.A. Conrad, 1838 † - (BUCANIIDAE) (FOSSIL)
- similis, Prosipho similis K.H.J. Thiele, 1912 - (BUCCINIDAE)
- similis, Retifusus similis (A.N. Golikov & V.V. Gulbin, 1977) - (BUCCINIDAE)
- similis, Amphidromus similis H.A. Pilsbry, 1900 - (CAMAENIDAE)
- similis, Bivetiella similis (Sowerby, 1833) - (CANCELLARIIDAE)
- similis, Serripes similis A.I. Kafanov, 1994 † - (CARDIIDAE) (FOSSIL)
- similis, Cardinia similis A.E.R. Agassiz, 1846 † - (CARDINIIDAE) (FOSSIL)
- similis, Cardita similis B. Phillips, 1829 † - (CARDITIDAE) (FOSSIL)
- similis, Chama similis N.H. Odhner, 1917 - syn of: Chama pulchella L.A. Reeve, 1846 - (CHAMIDAE)
- similis, Solatopupa similis (J.G. Bruguière, 1792) - (CHONDRINIDAE)
- similis, Albinaria similis (J.G.F. de Charpentier, 1837) - (CLAUSILIIDAE)
- similis, Fusiturris similis (Ant. Bivona-Bernardi & And. Bivona-Bernardi, 1838) - (CLAVATULIDAE)
- similis, Mimospira similis Wängberg-Eriksson, 1979 † - (CLISOSPIRIDAE) (FOSSIL)
- similis, Clymenia similis G.G. Münster, 1839 † - syn of: Linguaclymenia similis (G.G. Münster, 1839 †) - (CLYMENIIDAE) (FOSSIL)
- similis, Heleobia similis (W.K. Weyrauch, 1963) - (COCHLIOPIDAE)
- similis, Cochlostoma elegans similis (A.J. Wagner, 1897) - (COCHLOSTOMATIDAE)
- similis, Costoanachis similis (E. Ravenel, 1861) - (COLUMBELLIDAE)
- similis, Columbella similis E. Ravenel, 1861 - syn of: Costoanachis similis (E. Ravenel, 1861) - (COLUMBELLIDAE)
- similis, Carditella similis K.H.J. Thiele & S.G.A. Jaeckel, 1931 - (CONDYLOCARDIIDAE)
- similis, Costellaria similis J.S. Schröter, 1805 - syn of: Vexillum polygonum (J.F. Gmelin, 1791) - (COSTELLARIIDAE)
- similis, Ctenodonta similis Ulrich, 1894 † - (CTENODONTIDAE) (FOSSIL)
- similis, Cardiomya similis E.M. Krylova, 1994 - syn of: Cardiomya cleryana (A.V.M.D. D'Orbigny, 1842) - (CUSPIDARIIDAE)
- similis, Japonia similis (E.A. Smith, 1894) - (CYCLOPHORIDAE)
- similis, Erosaria erosa similis (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- similis, Batissa similis T. Prime, 1862 - (CYRENIDAE)
- similis, Corbicula similis (W. Wood, 1828) - (CYRENIDAE)
- similis, Cyrena similis E. Griffith & E. Pidgeon, 1833 - syn of: Corbicula fluminea (O.F. Müller, 1774) - (CYRENIDAE)
- similis, Cyrena similis G.P. Deshayes, 1854 - syn of: Corbicula similis (W. Wood, 1828) - (CYRENIDAE)
- similis, Arinia similis E.A. Smith, 1894 - (DIPLOMMATINIDAE)
- similis, Doris similis J. Alder & A. Hancock, 1842 - syn of: Acanthodoris pilosa (P.C. Abildgaard in O.F. Müller, 1789) - (DORIDIDAE)
- similis, Abralia similis T.A. Okutani & S. Tsuchiya, 1987 - (ENOPLOTEUTHIDAE)
- similis, Epitonium similis G.B. II Sowerby, 1844 - syn of: Epitonium jomardi (J.V. Audouin, 1827) - (EPITONIIDAE)
- similis, Eulima similis K.H.J. Thiele, 1925 - (EULIMIDAE)
- similis, Euomphalus similis F.B. Meek & A.H. Worthen, 1862 † - (EUOMPHALIDAE) (FOSSIL)
- similis, Fusinus similis (W. Baird, 1873) - (FASCIOLARIIDAE)
- similis, Puncturella similis A. Warén & P. Bouchet, 2009 - (FISSURELLIDAE)
- similis, Fissurella similis G.B. Sowerby, 1862 - syn of: Diodora jukesii (L.A. Reeve, 1850) - (FISSURELLIDAE)
- similis, Gastrocopta similis V. Sterki, 1909 - (GASTROCOPTIDAE)
- similis, Proacirsa similis (Moore, 1867 †) - (GORDENELLIDAE) (FOSSIL)
- similis, Brasilia similis (Buckman, 1889 †) - (GRAPHOCERATIDAE) (FOSSIL)
- similis, Lytohamites similis T.L. Casey, 1961 † - (HAMITIDAE) (FOSSIL)
- similis, Helicotoma similis R.P. Whitfield, 1890 † - (HELICOTOMIDAE) (FOSSIL)
- similis, Teichertia similis Shimansky, 1975 † - (HERCOGLOSSIDAE) (FOSSIL)
- similis, Hiatella similis G.P. Deshayes in L. Maillard, 1863 - syn of: Hiatella arctica (C. Linnaeus, 1767) - (HIATELLIDAE)
- similis, Holopea similis Ulrich & Scofield, 1897 † - (HOLOPEIDAE) (FOSSIL)
- similis, Pyrgulopsis similis R. Hershler, L. Ratcliffe & al., 2014 - (HYDROBIIDAE)
- similis, Mercuria similis (J.P.R. Draparnaud, 1805) - (HYDROBIIDAE)
- similis, Pyrgula similis B.M. Logvinenko & Y.I. Starobogatov, 1968 - (HYDROBIIDAE)
- similis, Islamia similis F. Haas, 1929 - syn of: Islamia globulus (A. Bofill, 1919) - (HYDROBIIDAE)
- similis, Georissa similis E.A. Smith, 1893 - (HYDROCENIDAE)
- similis, Permophorus similis Girty, 1927 † - syn of: Permophorus bregeri (Girty, 1927 †) - (KALENTERIDAE) (FOSSIL)
- similis, Linguaclymenia similis (G.G. Münster, 1839 †) - (KOSMOCLYMENIIDAE) (FOSSIL)
- similis, Natalites similis Spath, 1921 † - (KOSSMATICERATIDAE) (FOSSIL)
- similis, Leptochiton similis E.A. Smith, 1894 - syn of: Leptochiton alveolus (S.L. Lovén, 1846) - (LEPTOCHITONIDAE)
- similis, Limatula similis (A.S. Jensen, 1912) - (LIMIDAE)
- similis, Lucinella similis T. Say, 1817 - syn of: Sphaerium simile T. Say, 1817 - (LUCINIDAE)
- similis, Mactra similis W. Wood, 1828 - syn of: Mactromeris polynyma (W. Stimpson, 1860) - (MACTRIDAE)
- similis, Hemimactra solidissima similis (T. Say, 1822) - (MACTRIDAE)
- similis, Margarites similis S.-Q. Zhang & S.-P. Zhang, 2017 - (MARGARITIDAE)
- similis, Marginella similis G.B. Sowerby, 1846 - syn of: Persicula obesa (J.H. Redfield, 1846) - (MARGINELLIDAE)
- similis, Dactyloteuthis similis von Seebach, 1864 † - (MEGATEUTHIDIDAE) (FOSSIL)
- similis, Melanopsis similis P.M. Pallary, 1916 † - (MELANOPSIDAE) (FOSSIL)
- similis, Metoptoma similis R.P. Whitfield, 1882 † - (METOPTOMATIDAE) (FOSSIL)
- similis, Milax similis T.D.A. Cockerell, 1891 - syn of: Milax nigricans (R.A. Philippi, 1836) - (MILACIDAE)
- similis, Modiolopsis similis Ulrich, 1892 † - (MODIOMORPHIDAE) (FOSSIL)
- similis, Tellinomya similis Ulrich, 1892 † - syn of: Similodonta similis (Ulrich, 1892 †) - (MONTACUTIDAE) (FOSSIL)
- similis, Murchisonia similis Trenkner, 1868 † - (MURCHISONIIDAE) (FOSSIL)
- similis, Hormotoma similis Donald † - (MURCHISONIIDAE) (FOSSIL)
- similis, Murex similis G.B. II Sowerby, 1841 - syn of: Siratus cailleti (S.A.A. Petit De La Saussaye, 1856) - (MURICIDAE)
- similis, Concholepas similis J.F. Mabille, 1886 - syn of: Concholepas concholepas (J.G. Bruguière, 1789) - (MURICIDAE)
- similis, Murex pseudonystii similis F.W. Harmer † - (MURICIDAE) (FOSSIL)
- similis, Mycetopus similis P.M. Heude, 1877 - syn of: Solenaia oleivorus (P.M. Heude, 1877) - (MYCETOPODIDAE)
- similis, Sphenia similis E.A. Smith, 1893 - syn of: Sphenia sowerbyi E.A. Smith, 1893 - (MYIDAE)
- similis, Mytilus similis Münster, 1841 † - (MYTILIDAE) (FOSSIL)
- similis, Mytilus similis S. Clessin, 1887 - syn of: Semimytilus algosus (Gould, 1850) - (MYTILIDAE)
- similis, Bullia similis G.B. III Sowerby, 1897 - (NASSARIIDAE)
- similis, Natica similis T.A. de M. Monterosato, 1884 - syn of: Euspira intricata similis (T.A. de M. Monterosato, 1884) - (NATICIDAE)
- similis, Euspira intricata similis (T.A. de M. Monterosato, 1884) - (NATICIDAE)
- similis, Neilonella similis (T.A. Okutani, 1962) - (NEILONELLIDAE)
- similis, Neritaria similis E.F.R.K. Koken, 1892 † - syn of: Neritaria plicatilis (Klipstein, 1843 †) - (NERITARIIDAE) (FOSSIL)
- similis, Cerithiella similis K.H.J. Thiele, 1912 - syn of: Cerithiella astrolabiensis (H. Strebel, 1908) - (NEWTONIELLIDAE)
- similis, Nucinella similis Berezovsky, 2015 † - (NUCINELLIDAE) (FOSSIL)
- similis, Ledella similis J.A. Allen & G. Hannah, 1989 - (NUCULANIDAE)
- similis, Pronucula similis A.E.M. Cossmann & G. Pissarro, 1904 † - (NUCULIDAE) (FOSSIL)
- similis, Nucula similis J. de C. Sowerby, 1813 - (NUCULIDAE)
- similis, Ennucula similis (P.M. Rhind & J.A. Allen, 1992) - (NUCULIDAE)
- similis, Nuculoma similis P.M. Rhind & Allen, 1992 - syn of: Ennucula similis (P.M. Rhind & J.A. Allen, 1992) - (NUCULIDAE)
- similis, Oliva similis F.P. Marrat, 1867 - syn of: Oliva bulbiformis similis F.P. Marrat, 1867 - (OLIVIDAE)
- similis, Oliva bulbiformis similis F.P. Marrat, 1867 - (OLIVIDAE)
- similis, Acanthodoris similis J. Alder & A. Hancock, 1842 - syn of: Acanthodoris pilosa (P.C. Abildgaard in O.F. Müller, 1789) - (ONCHIDORIDIDAE)
- similis, Orbitestella similis E. Rolán & F. Rubio, 1992 - syn of: Orbitestella bermudezi (C.G. Aguayo & P.J. Borro, 1946) - (ORBITESTELLIDAE)
- similis, Pandora similis G.B. III Sowerby, 1897 - (PANDORIDAE)
- similis, Pecten similis G.B. II Sowerby, 1842 - syn of: Pecten maxima (C. Linnaeus, 1758) - (PECTINIDAE)
- similis, Hyalopecten similis J.C. Laskey, 1811 - syn of: Similipecten similis (J.C. Laskey, 1811) - (PECTINIDAE)
- similis, Ulrichospira similis J. Donald, 1905 † - (PHANEROTREMATIDAE) (FOSSIL)
- similis, Barnea similis (J.E. Gray, 1835) - (PHOLADIDAE)
- similis, Pholas similis J.E. Gray, 1835 - syn of: Barnea similis (J.E. Gray, 1835) - (PHOLADIDAE)
- similis, Borestus similis (de Koninck, 1883 †) - (PHYMATOPLEURIDAE) (FOSSIL)
- similis, Supplanaxis similis E.A. Smith, 1872 - syn of: Supplanaxis niger (J.R.C. Quoy & J.P. Gaimard, 1833) - (PLANAXIDAE)
- similis, Planorbarius similis E.A. Bielz, 1851 - syn of: Planorbarius corneus (C. Linnaeus, 1758) - (PLANORBIDAE)
- similis, Pleurotomaria similis Sowerby, 1818 † - syn of: Pleurotomaria anglica (Sowerby, 1818 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- similis, Plicatula similis G.B. II Sowerby, 1842 - syn of: Pecten maxima (C. Linnaeus, 1758) - (PLICATULIDAE)
- similis, Tudora similis J.E. Gray in G.B. Sowerby, 1850 - (POMATIIDAE)
- similis, Similipecten similis (J.C. Laskey, 1811) - (PROPEAMUSSIIDAE)
- similis, Oonia similis (Münster, 1841 †) - (PSEUDOMELANIIDAE) (FOSSIL)
- similis, Tiberia similis (K.H.J. Thiele, 1925) - (PYRAMIDELLIDAE)
- similis, Chemnitzia similis (C.F. Laseron, 1951) - (PYRAMIDELLIDAE)
- similis, Rissoa similis A. Scacchi, 1836 - (RISSOIDAE)
- similis, Hyalosagda similis (C.B. Adams, 1849) - (SAGDIDAE)
- similis, Exochorhynchus similis (Lutkevitch & Lobanova, 1960 †) - (SANGUINOLITIDAE) (FOSSIL)
- similis, Akritogyra similis (J.G. Jeffreys, 1883) - (SEGUENZIOIDEA (UNASSIGNED))
- similis, Lissotesta similis (K.H.J. Thiele, 1912) - (SEGUENZIOIDEA (UNASSIGNED))
- similis, Cumingia similis A. Adams, 1850 - syn of: Cumingia californica T.A. Conrad, 1837 - (SEMELIDAE)
- similis, Similodonta similis (Ulrich, 1892 †) - (SIMILODONTIDAE) (FOSSIL)
- similis, Similotheca similis (Walcott, 1890 †) - (SIMILOTHECIDAE) (FOSSIL)
- similis, Streptostyla irrigua similis H. Strebel, 1877 - (SPIRAXIDAE)
- similis, Tellina similis J. de C. Sowerby, 1806 - (TELLINIDAE)
- similis, Duplicaria similis (E.A. Smith, 1873) - (TEREBRIDAE)
- similis, Melania similis Münster, 1841 † - syn of: Oonia similis (Münster, 1841 †) - (THIARIDAE) (FOSSIL)
- similis, Thracia similis J.P.Y. Couthouy, 1839 - (THRACIIDAE)
- similis, Adontorhina similis P.J. Barry & J.B. McCormack, 2007 - (THYASIRIDAE)
- similis, Tindaria similis T.A. Okutani, 1962 - syn of: Neilonella similis (T.A. Okutani, 1962) - (TINDARIIDAE)
- similis, Circulus similis (G.P. Deshayes, 1862 ) - (TORNIDAE)
- similis, Discopsis similis E. Rolán & F. Rubio, 2002 - (TORNIDAE)
- similis, Trigonia similis A.E.R. Agassiz, 1840 † - (TRIGONIIDAE) (FOSSIL)
- similis, Cautor similis (W.H. Pease, 1871) - (TRIPHORIDAE)
- similis, Triphora similis W.H. Pease, 1871 - syn of: Cautor similis (W.H. Pease, 1871) - (TRIPHORIDAE)
- similis, Trochus similis Sowerby, 1816 † - syn of: Pleurotomaria anglica (Sowerby, 1818 †) - (TROCHIDAE) (FOSSIL)
- similis, Turbo similis Münster, 1841 † - syn of: Prostylifer paludinaris (Münster, 1841 †) - (TURBINIDAE) (FOSSIL)
- similis, Submargarita similis K.H.J. Thiele, 1912 - syn of: Lissotesta similis (K.H.J. Thiele, 1912) - (TURBINIDAE)
- similis, Pleurotoma similis Ant. Bivona-Bernardi & And. Bivona-Bernardi, 1838 - syn of: Fusiturris similis (Ant. Bivona-Bernardi & And. Bivona-Bernardi, 1838) - (TURRIDAE)
- similis, Vacunella similis Lutkevitch & Lobanova, 1960 † - syn of: Exochorhynchus similis (Lutkevitch & Lobanova, 1960 †) - (VACUNELLIDAE) (FOSSIL)
- similis, Venus similis W. Wood, 1828 - syn of: Corbicula similis (W. Wood, 1828) - (VENERIDAE)
- similis, Clementia similis G.P. Deshayes, 1853 - syn of: Kyrina granulifera (G.B. II Sowerby, 1852) - (VENERIDAE)
- similis, Clementia similis G.B. II Sowerby, 1852 - syn of: Clementia papyracea (J.F. Gmelin, 1791) - (VENERIDAE)
- similis, Tapes similis G.P. Deshayes, 1853 - syn of: Polititapes durus (J.F. Gmelin, 1791) - (VENERIDAE)
- similis, Vertigo similis A.E.J. Férussac, 1821 - syn of: Isthmia pygmaea (J.P.R. Draparnaud, 1801) - (VERTIGINIDAE)
- similis, Yoldiella similis J.A. Allen, A. Sanders & G. Hannah, 1995 - (YOLDIIDAE)
- similis, Yoldia similis J.T. Kuroda & T. Habe in T. Habe, 1961 - (YOLDIIDAE)
- similis curtisiana, Mercuria similis curtisiana (J.P.R. Draparnaud, 1805) - (HYDROBIIDAE)
- similis decurtata, Rissoa similis decurtata (T.A. de M. Monterosato, 1884) - (RISSOIDAE)
- similis distantestriata, Rissoa similis distantestriata F. Nordsieck, 1972 - (RISSOIDAE)
- similis excelsior, Rissoa similis excelsior J.J. Oberling, 1971 - syn of: Rissoa lia (T.A. de M. Monterosato, 1884) - (RISSOIDAE)
- similis gallica, Nucula similis gallica M. Glibert & Poel, 1965 † - (NUCULIDAE) (FOSSIL)
- similis leucadia, Albinaria similis leucadia C.A. Westerlund, 1901 - syn of: Albinaria senilis leucadia (C.A. Westerlund, 1901) - (CLAUSILIIDAE)
- similis longa, Varicella similis longa H.A. Pilsbry, 1907 - syn of: Euvaricella biplicatula longior (H.A. Pilsbry, 1909) - (OLEACINIDAE)
- similis major, Natica similis major T.A. de M. Monterosato, 1884 - syn of: Euspira intricata similis (T.A. de M. Monterosato, 1884) - (NATICIDAE)
- similis obscura, Rissoa similis obscura F. Nordsieck, 1972 - (RISSOIDAE)
- similis rubrocincta, Rissoa similis rubrocincta F. Danilo & G.B. Sandri, 1866 - (RISSOIDAE)
- similis tenuicostata, Mercuria similis tenuicostata (J.P.R. Draparnaud, 1805) - (HYDROBIIDAE)
- similiter, Crosseola similiter Rubio & Rolán, 2017 - (CROSSEOLIDAE)
- similiter, Ebalina similiter A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- similiter, Schwartziella similiter E. Rolán & L. Luque, 2000 - (ZEBINIDAE)
- similivalvis, Radiolites similivalvis Astre, 1932 † - syn of: Biradiolites lameracensis Toucas, 1909 † - (RADIOLITIDAE) (FOSSIL)
- Similivenus, Genus Similivenus Cossmann, 1910 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- simillima, Aclis simillima E.A. Smith, 1890 - (ACLIDIDAE)
- simillima, Renschiphaedusa cumingiana simillima (E.A. Smith, 1896) - (CLAUSILIIDAE)
- simillima, Renschiphaedusa moluccensis simillima (L. Pfeiffer, 1845) - (CLAUSILIIDAE)
- simillima, Fusiturris simillima F.E. Edwards, 1861 † - syn of: Eopleurotoma simillima (F.E. Edwards, 1861 †) - (CLAVATULIDAE) (FOSSIL)
- simillima, Cochlespira simillima A.W.B. Powell, 1969 - (COCHLESPIRIDAE)
- simillima, Cardiomya simillima E.A. Smith, 1915 - syn of: Cardiomya cleryana (A.V.M.D. D'Orbigny, 1842) - (CUSPIDARIIDAE)
- simillima, Epitonium simillima C.M. Tapparone-Canefri, 1876 - syn of: Epitonium albidum (A.V.M.D. D'Orbigny, 1842) - (EPITONIIDAE)
- simillima, Haminoea simillima W.H. Pease, 1868 - syn of: Haminoea cymbalum (J.R.C. Quoy & J.P. Gaimard, 1832) - (HAMINOEIDAE)
- simillima, Limatula simillima (K.H.J. Thiele, 1912) - (LIMIDAE)
- simillima, Divaricella ornata simillima A.E.M. Cossmann & M.A. Peyrot, 1921 † - (LUCINIDAE) (FOSSIL)
- simillima, Montacuta simillima E.A. Smith, 1872 - syn of: Kurtiella pellucida (J.G. Jeffreys, 1881) - (MONTACUTIDAE)
- simillima, Distorsio simillima Sowerby, 1850 † - (PERSONIDAE) (FOSSIL)
- simillima, Odostomia simillima (G. Montagu, 1803) - (PYRAMIDELLIDAE)
- simillima, Pleurotomella simillima K.H.J. Thiele, 1912 - (RAPHITOMIDAE)
- simillima, Powellisetia simillima (W.L. May, 1915) - (RISSOIDAE)
- simillima, Eopleurotoma simillima (F.E. Edwards, 1861 †) - (TURRIDAE) (FOSSIL)
- simillima, Venus simillima G.B. I Sowerby, 1853 - syn of: Chione undatella (G.B. I Sowerby, 1835) - (VENERIDAE)
- simillimum, Microcardium simillimum (E.A. Smith, 1896) - (CARDIIDAE)
- simillimum, Cenoceras simillimum Foord & Crick, 1890 † - (CENOCERATIDAE) (FOSSIL)
- simillimus, Cadulus simillimus R.B. Watson, 1879 - (GADILIDAE)
- simillimus, Diplodon simillimus A.E. Ortmann, 1921 - syn of: Rhipidodonta charruana (A.V.M.D. D'Orbigny, 1835) - (HYRIIDAE)
- simillimus, Pyrunculus simillimus (R.B. Watson, 1883) - (RETUSIDAE)
- simillina, Venericardia simillina A.A. Olsson, 1930 † - (CARDITIDAE) (FOSSIL)
- simillissimus, Cenoceras simillissimus † - (CENOCERATIDAE) (FOSSIL)
- simillissimus, Cenoceras simillissimus (Foord & Crick, 1890 †) - (CENOCERATIDAE) (FOSSIL)
- similminuta, Eulimella similminuta A. Peñas & E. Rolán, 1997 - (PYRAMIDELLIDAE)
- Similoconcha, Genus Similoconcha Zhang, 1977 † (NUCULIDA (UNASSIGNED)) (FOSSIL)
- Similodonta, Genus Similodonta Soot-Ryen, 1964 † (SIMILODONTIDAE) (FOSSIL)
- SIMILODONTIDAE Carter & Pojeta, 2011 † - Family (BIVALVIA-PROTOBRANCHIA [Subclass]-AFGHANODESMATIDA [Order]-TIRONUCULOIDEA [Superfamily]) (FOSSIL)
- similoides, Botula similoides Vokes 1946 † - (MYTILIDAE) (FOSSIL)
- similor, Triphora similor P. Bouchet & H. Guillemot, 1978 - syn of: Similiphora similior (P. Bouchet & H. Guillemot, 1978) - (TRIPHORIDAE)
- Similotheca, Genus Similotheca Malinky , 1988 † (SIMILOTHECIDAE) (FOSSIL)
- SIMILOTHECIDAE Malinky, 1988 † - Family (HYOLITHA-HYOLITHIDA [Order]) (FOSSIL)
- simils, Hyalosagda simils (C.B. Adams, 1849) - (SAGDIDAE)
- simils, Clementia simils G.P. Deshayes, 1853 - syn of: Kyrina granulifera (G.B. II Sowerby, 1852) - (VENERIDAE)
- similtiberia, Turbonilla similtiberia A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- simiola, Euphaedusa simiola (P.V. Gredler, 1883) - (CLAUSILIIDAE)
- Simionescites, syn of: Subgenus Ancyloceras (Kutatissites) Krenkel, 1910 † (ANCYLOCERATIDAE) (FOSSIL)
- simionescui, Kutatissites simionescui (Avram, 1976 †) - (ANCYLOCERATIDAE) (FOSSIL)
- simionescui, Sornayites simionescui (Sarkar, 1955 †) - (CRIOCERATITIDAE) (FOSSIL)
- simionescui, Romanites simionescui E.A.L. Kittl, 1908 † - (JOANNITIDAE) (FOSSIL)
- simionescui, Shvetsovia simionescui (Stoyanova-Vergilova, 1970 †) - (MESOHIBOLITHIDAE) (FOSSIL)
- simionescui, Hibolithes simionescui Stoyanova-Vergilova, 1970 † - syn of: Shvetsovia simionescui (Stoyanova-Vergilova, 1970 †) - (MESOHIBOLITHIDAE) (FOSSIL)
- simitecta, Pomacea simitecta A. Mousson, 1873 - syn of: Pomacea semitecta (A. Mousson, 1873) - (AMPULLARIIDAE)
- simitiense, Pseudocrioceras simitiense Kakabadze & Thieuloy, 1991 † - (ANCYLOCERATIDAE) (FOSSIL)
- simitiensis, Spitidiscus simitiensis F. Haas, 1960 † - (BARREMITIDAE) (FOSSIL)
- simizuensis, Macoma simizuensis Krishtofovich, 1957 † - (TELLINIDAE) (FOSSIL)
- simizui, Nassarius simizui Y. Otuka, 1934 † - (NASSARIIDAE) (FOSSIL)
- simkini, Kolymia simkini Popow, 1958 † - (KOLYMIIDAE) (FOSSIL)
- simmetricus, Pyramus simmetricus Lutkevitch & Lobanova, 1960 † - (MEGADESMIDAE) (FOSSIL)
- Simmoceras, syn of: Genus Simmonoceras Kuzina, 1974 † (NOMISMOCERATIDAE) (FOSSIL)
- simmonensis, Holopea simmonensis Tolmachoff, 1930 † - (HOLOPEIDAE) (FOSSIL)
- Simmonoceras, Genus Simmonoceras Kuzina, 1974 † (NOMISMOCERATIDAE) (FOSSIL)
- simmonsi, Archinacella simmonsi Hussey, 1926 † - syn of: Archinacella kagawongensis Foerste, 1924 † - (ARCHINACELLIDAE) (FOSSIL)
- simmonsi, Sonorella simmonsi W.B. Miller, 1966 - (HELMINTHOGLYPTIDAE)
- simmsi, Parahoplites simmsi (Forbes) † - (PARAHOPLITIDAE) (FOSSIL)
- Simnia, Genus Simnia A. Risso, 1826 (OVULIDAE)
- Simnialena, Genus Simnialena J. Cate, 1973 (OVULIDAE)
- Simniini, syn of: Genus Testudovolva J. Cate, 1973 (OVULIDAE)
- Simobactrites, Genus Simobactrites Doguzhaeva , 2002 † (BACTRITIDAE) (FOSSIL)
- Simobelus, Subgenus Pachyteuthis (Simobelus) Gustomesov, 1958 (BELEMNITIDA (UNASSIGNED)) (FOSSIL)
- Simoceras, Genus Simoceras Zittel, 1870 † (SIMOCERATIDAE) (FOSSIL)
- SIMOCERATIDAE Spath, 1924 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-PERISPHINCTOIDEA [Superfamily]) (FOSSIL)
- simocheila, Otala simocheila J.R. Bourguignat in J. Péchaud, 1883 - syn of: Otala lactea (O.F. Müller, 1774) - (HELICIDAE)
- Simocosmoceras, Genus Simocosmoceras Spath, 1925 † (AULACOSTEPHANIDAE) (FOSSIL)
- simodae, Euhadra peliomphala simodae (J.C. Jay, 1857) - (BRADYBAENIDAE)
- simodense, Calliostoma simodense N. Ikebe, 1942 - (CALLIOSTOMATIDAE)
- simoensis, Conus simoensis Martin, 1906 † - (CONIDAE) (FOSSIL)
- simoesi, Unio simoesi J. Da Silva e Castro, 1885 - syn of: Unio abrantesianus É.A.A. Locard, 1899 - (UNIONIDAE)
- simoesi, Anodonta simoesi É.A.A. Locard, 1899 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- simois, Mericoceras simois (Barrande, 1867 †) - (MICHELINOCERATIDAE) (FOSSIL)
- simokitana, Pyrgulina simokitana (S. Nomura, 1939) - (PYRAMIDELLIDAE)
- Simomactra, Genus Simomactra W.H. Dall, 1894 (MACTRIDAE)
- simonae, Gibberula simonae C. Smriglio, 2003 - (CYSTISCIDAE)
- Simonaias, syn of: Genus Nephronaias J.C.H. Crosse & P. Fischer, 1894 (UNIONIDAE)
- simondsi, Shumardites simondsi Smith, 1903 † - (SHUMARDITIDAE) (FOSSIL)
- simone, Diallagites simone Klug, 2002 † - (WERNEROCERATIDAE) (FOSSIL)
- simoneae, Pusia simoneae Marrow, 2017 - (COSTELLARIIDAE)
- simoneae, Anguipecten simoneae H. Morrison & Whisson, 2009 - (PECTINIDAE)
- simoneae, Amoria simoneae P. Bail & A. Limpus, 2003 - (VOLUTIDAE)
- simonei, Monostiolum simonei G.T. Watters, 2016 - (BUCCINIDAE)
- simonei, Conasprella simonei (E.J. Petuch & B.W. Myers, 2014) - (CONIDAE)
- simonei, Jaspidiconus simonei E.J. Petuch & B.W. Myers, 2014 - syn of: Conasprella simonei (E.J. Petuch & B.W. Myers, 2014) - (CONIDAE)
- simonei, Diastole simonei Thach & F. Huber, 2017 - (EUCONULIDAE)
- simonei, Terebra simonei S.F.B. de Lima, D. de Oliveira Tenório & J.C.N. Barros, 2007 - (TEREBRIDAE)
- simonei, Niveria simonei Fehse, 2016 - (TRIVIIDAE)
- simonetae, Orania simonetae R. Houart, 1995 - (MURICIDAE)
- simonettae, Solatopupa guidoni simonettae (F.L. Giusti, 1970) - (CHONDRINIDAE)
- simonhudsoni, Pallidelix simonhudsoni J. Stanisic, 2015 - (CAMAENIDAE)
- simoni, Phengus simoni F.P. Jousseaume, 1894 - (BRADYBAENIDAE)
- simoni, Reticunassa simoni (H.H. Kool & H. Dekker, 2007 †) - (NASSARIIDAE) (FOSSIL)
- simoni, Neripteron simoni (B. Prashad, 1921) - (NERITIDAE)
- simoni, Neorthonema simoni A. Nützel, 2007 † - (ORTHONEMATIDAE) (FOSSIL)
- simoni, Physa simoni F.P. Jousseaume, 1889 - syn of: Aplexa marmorata L. Guilding, 1828 - (PHYSIDAE)
- simoni, Eupera simoni (F.P. Jousseaume, 1889) - (SPHAERIIDAE)
- simoni, Limosina simoni F.P. Jousseaume, 1889 - syn of: Eupera simoni (F.P. Jousseaume, 1889) - (SPHAERIIDAE)
- simoni, Glessula simoni (F.P. Jousseaume, 1894) - (SUBULINIDAE)
- simoni, Clanculus simoni G.T. Poppe, S.P. Tagaro & H. Dekker, 2006 - (TROCHIDAE)
- simoniana, Armina simoniana K.H.J. Thiele, 1925 - (ARMINIDAE)
- simoniana, Euthria simoniana S.A.A. Petit De La Saussaye, 1852 - syn of: Afrocominella capensis simoniana (S.A.A. Petit De La Saussaye, 1852) - (BUCCINIDAE)
- simoniana, Afrocominella capensis simoniana (S.A.A. Petit De La Saussaye, 1852) - (BUCCINIDAE)
- simoniana, Bythinella simoniana (A. Moquin-Tandon, 1856) - (BYTHINELLIDAE)
- simoniana, Moitessieria simoniana (A.de Saint-Simon, 1848) - (MOITESSIERIIDAE)
- simoniana, Punctum simoniana J.R. Bourguignat, 1870 - syn of: Punctum pygmaeum (J.P.R. Draparnaud, 1801) - (PUNCTIDAE)
- simoniana, Austropusilla simoniana R.N. Kilburn, 1974 - (RAPHITOMIDAE)
- simoniana, Sepia simoniana K.H.J. Thiele, 1920 - (SEPIIDAE)
- simoniana, Perrottetia simoniana (P.M. Heude, 1890) - (STREPTAXIDAE)
- simonianus, Fusus simonianus S.A.A. Petit De La Saussaye, 1852 - syn of: Afrocominella capensis simoniana (S.A.A. Petit De La Saussaye, 1852) - (FASCIOLARIIDAE)
- simonis, Cumia simonis (L. Bozzetti, 2004) - (COLUBRARIIDAE)
- simonis, Conus simonis L. Bozzetti, 2010 - syn of: Pionoconus striolatus (L.C. Kiener, 1848) - (CONIDAE)
- simonis, Fusus simonis L. Bozzetti, 2004 - syn of: Cumia simonis (L. Bozzetti, 2004) - (FASCIOLARIIDAE)
- simonis, Chondrothyretes parilis simonis (C. de la Torre & P. Bartsch, 1938) - (POMATIIDAE)
- simonis, Pterocera simonis L.É.S. Piette, 1856 † - syn of: Dicroloma cirrus (Eudes-Deslongchamps, 1843 †) - (STROMBIDAE) (FOSSIL)
- simonis, Synopeas simonis F.P. Jousseaume, 1889 - (SUBULINIDAE)
- simonis, Tomelasmus thomsoni simonis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- simonis, Paludina simonis A.R.J.B. Bavay, 1898 - (VIVIPARIDAE)
- simonnei, Pseudozonaria simonnei A. Dey, 1961 † - (CYPRAEIDAE) (FOSSIL)
- simonnei, Hyphantosoma simonnei A. Dey, 1961 † - (VENERIDAE) (FOSSIL)
- simonsae, Coronadoa simonsae P. Bartsch, 1946 - (SCISSURELLIDAE)
- simonsi, Alvania simonsi R. Marquet, 1997 † - (RISSOIDAE) (FOSSIL)
- simonsiana, Fluvidona simonsiana J.W. Brazier, 1875 - (HYDROBIIDAE)
- simonsoni, Oliva simonsoni Ward, 1998 † - (OLIVIDAE) (FOSSIL)
- simony, Glessula simony F.P. Jousseaume, 1894 - syn of: Glessula simoni (F.P. Jousseaume, 1894) - (SUBULINIDAE)
- Simonyceras, Genus Simonyceras Wiedmann , 1970 † (USSURITIDAE) (FOSSIL)
- simonyi, Paranautilus simonyi (J. Von Hauer, 1849 †) - (LIROCERATIDAE) (FOSSIL)
- simonyi, Lytoceras simonyi J. Von Hauer, 1847 † - syn of: Simonyceras simonyi (J. Von Hauer, 1847 †) - (LYTOCERATIDAE) (FOSSIL)
- simonyi, Nautilus simonyi J. Von Hauer, 1849 † - syn of: Paranautilus simonyi (J. Von Hauer, 1849 †) - (NAUTILIDAE) (FOSSIL)
- simonyi, Simonyceras simonyi (J. Von Hauer, 1847 †) - (USSURITIDAE) (FOSSIL)
- Simorthoceras, Genus Simorthoceras Shimanskiy, 1954 † (PSEUDORTHOCERATIDAE) (FOSSIL)
- simosa, Flexiclymenia simosa Czarnocki, 1989 † - syn of: Protactoclymenia simosa (Czarnocki, 1989 †) - (CYMACLYMENIIDAE) (FOSSIL)
- simosa, Protactoclymenia simosa (Czarnocki, 1989 †) - (CYRTOCLYMENIIDAE) (FOSSIL)
- Simosphinctes, Genus Simosphinctes Barthel, 1957 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- simostomus, Arcestes simostomus Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- Simotoichites, Genus Simotoichites Buckman, 1923 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- simotomensis, Panomya simotomensis Y. Otuka, 1934 † - (HIATELLIDAE) (FOSSIL)
- simovi, Bythiospeum simovi D.G. Georgiev, 2013 - (HYDROBIIDAE)
- simozonum, Wisconsinella simozonum Radabaugh, 1942 † - syn of: Wisconsinella clelandi Blodgett, 1988 † - (GOSSELETINIDAE) (FOSSIL)
- Simpilicervix, Subgenus Brachypodella (Simpilicervix) H.A. Pilsbry, 1903 (UROCOPTIDAE)
- simpla, Pirsila simpla L.W. Stephenson, 1953 † - (ACTEONIDAE) (FOSSIL)
- simpla, Hemimarginula simpla (J.M.J. Christiaens, 1987) - (FISSURELLIDAE)
- simpla, Circassina frutis simpla A.A. Schileyko, 1972 - (HYGROMIIDAE)
- simpla, Pleurophorina simpla (Keyserling 1846) † - (UCUMARIIDAE) (FOSSIL)
- Simplacmaea, syn of: Genus Lottia J.E. Gray, 1833 (LOTTIIDAE)
- simplaria, Partula simplaria P.M.A. Morelet, 1853 - (PARTULIDAE)
- simplecostatum, Bejucoceras simplecostatum Cantú Chapa, 1976 † - (AEGOCRIOCERATIDAE) (FOSSIL)
- simplex, Mitiperua simplex C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- simplex, Tornatellina simplex W.H. Pease, 1864 - syn of: Tornatellides oblongus (H.E. Anton, 1839) - (ACHATINELLIDAE)
- simplex, Tornatellides simplex H.A. Pilsbry, 1910 - syn of: Tornatellides oblongus (H.E. Anton, 1839) - (ACHATINELLIDAE)
- simplex, Archachatina simplex E.A. Smith, 1878 - (ACHATINIDAE)
- simplex, Caucasochordiceras simplex F.B. Meek, 1877 † - syn of: Acrochordiceras hyatti F.B. Meek, 1877 † - (ACROCHORDICERATIDAE) (FOSSIL)
- simplex, Acrochordiceras simplex Shevyrev, 1968 † - syn of: Acrochordiceras hyatti F.B. Meek, 1877 † - (ACROCHORDICERATIDAE) (FOSSIL)
- simplex, Acteocina simplex (A. Adams, 1850) - (ACTEOCINIDAE)
- simplex, Barskovia simplex W.C. Zhou & Q. Xiao, 1984 † - (ALDANELLIDAE) (FOSSIL)
- simplex, Leptachatina simplex W.H. Pease, 1869 - (AMASTRIDAE)
- simplex, Mytilarca simplex J.W. Hall, 1883 † - (AMBONYCHIIDAE) (FOSSIL)
- simplex, Ammonites simplex C.T. Simpson, 1855 † - syn of: Pseudolioceras boulbiense (A.T. Young & Bird, 1822 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- simplex, Pomacea simplex L.A. Reeve, 1856 - syn of: Pomacea lineata (J.B. von Spix, 1827) - (AMPULLARIIDAE)
- simplex, Dirrymoceras simplex (A.V.M.D. D'Orbigny, 1842 †) - (ANCYLOCERATIDAE) (FOSSIL)
- simplex, Anderssonoceras simplex J.K. Zhao & al., 1978 † - (ANDERSSONOCERATIDAE) (FOSSIL)
- simplex, Anomia simplex D'Orbigny, 1853 - (ANOMIIDAE)
- simplex, Anomia simplex J.F. Mabille, 1895 - syn of: Anomia peruviana A.V.M.D. D'Orbigny, 1846 - (ANOMIIDAE)
- simplex, Graciliala simplex (A.V.M.D. A.V.M.D. D'Orbigny, 1843 †) - (APORRHAIDAE) (FOSSIL)
- simplex, Sanyangites simplex Zheng & X.T. Ma, 1982 † - (ARAXOCERATIDAE) (FOSSIL)
- simplex, Araxoceras simplex Qin, 1986 † - (ARAXOCERATIDAE) (FOSSIL)
- simplex, Prototoceras simplex Qin, 1986 † - (ARAXOCERATIDAE) (FOSSIL)
- simplex, Arcestes simplex Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- simplex, Archinacella simplex (Billings, 1865 †) - (ARCHINACELLIDAE) (FOSSIL)
- simplex, Basisulcata simplex (H.G. Bronn, 1831 †) - (ARCHITECTONICIDAE) (FOSSIL)
- simplex, Isocyprina simplex Arkell, 1934 † - (ARCTICIDAE) (FOSSIL)
- simplex, Arctoceras simplex A.M. Popov, 1961 † - syn of: Nordophiceras karpinskii (Mojsisovics, 1886 †) - (ARCTOCERATIDAE) (FOSSIL)
- simplex, Eubaculites simplex (Kossmat, 1895 †) - (BACULITIDAE) (FOSSIL)
- simplex, Barleeia simplex E.A. Smith, 1875 - (BARLEEIIDAE)
- simplex, Bornella simplex C.N.E. Eliot, 1904 - syn of: Bornella stellifer (A. Adams & L.A. Reeve in A. Adams, 1848) - (BORNELLIDAE)
- simplex, Helicostyla simplex I.H. Jonas, 1843 - (BRADYBAENIDAE)
- simplex, Euhystrichoceras simplex Spath, 1933 † - (BRANCOCERATIDAE) (FOSSIL)
- simplex, Buccinum simplex (A.T. von Middendorff, 1848) - (BUCCINIDAE)
- simplex, Falsitromina simplex (A.W.B. Powell, 1951) - (BUCCINIDAE)
- simplex, Mohnia simplex (A.E. Verrill, 1884) - (BUCCINIDAE)
- simplex, Volutopsius simplex W.H. Dall, 1907 - syn of: Volutopsius castaneus (O.A.L. Mörch, 1857) - (BUCCINIDAE)
- simplex, Bulimulus simplex H.H. Beck, 1837 - (BULIMULIDAE)
- simplex, Bulimus simplex L.H. Hupé, 1857 - syn of: Bostryx tyleri W.H. Dall, 1912 - (BULIMULIDAE)
- simplex, Calliostoma simplex M.M. Schepman, 1908 - (CALLIOSTOMATIDAE)
- simplex, Cristilabrum simplex G.A. Solem, 1981 - (CAMAENIDAE)
- simplex, Amphidromus adamsii simplex H.C. Fulton, 1896 - (CAMAENIDAE)
- simplex, Pepta simplex (C.F. Laseron, 1955) - (CANCELLARIIDAE)
- simplex, Cancellaria simplex Anderson, 1905 † - (CANCELLARIIDAE) (FOSSIL)
- simplex, Offneria simplex Chartrousse & Masse † - (CAPRINIDAE) (FOSSIL)
- simplex, Capulus simplex É.A.A. Locard, 1898 - (CAPULIDAE)
- simplex, Collignonicardia simplex Mahmoud 1955 † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- simplex, Acrosterigma simplex (L. Spengler, 1799) - (CARDIIDAE)
- simplex, Granocardium simplex J.H.F. Douvillé, 1916 † - (CARDIIDAE) (FOSSIL)
- simplex, Venericardia simplex W.H. Dall, 1903 † - (CARDITIDAE) (FOSSIL)
- simplex, Cassianella simplex C. Chen, 1976 † - (CASSIANELLIDAE) (FOSSIL)
- simplex, Ceratites simplex Mojsisovics, 1886 † - syn of: Arctoceras blomstrandi (Lindström, 1865 †) - (CERATITIDAE) (FOSSIL)
- simplex, Pteromya simplex C. Moore, 1861 † - (CERATOMYIDAE) (FOSSIL)
- simplex, Bittium simplex (J.G. Jeffreys, 1867) - (CERITHIIDAE)
- simplex, Cerithium simplex W.M. Gabb, 1873 † - (CERITHIIDAE) (FOSSIL)
- simplex, Chaetoderma simplex L. Salvini-Plawén, 1971 - (CHAETODERMATIDAE)
- simplex, Raymondiceras simplex (W.J. Raymond, 1909 †) - (CHEILOCERATIDAE) (FOSSIL)
- simplex, Chondrina simplex C. Altimira, 1959 - syn of: Chondrina farinesii C. des Moulins, 1835 - (CHONDRINIDAE)
- simplex, Noumea simplex (W.H. Pease, 1871) - (CHROMODORIDIDAE)
- simplex, Procladiscites simplex Wang, 1978 † - (CLADISCITIDAE) (FOSSIL)
- simplex, Pleurotomoides simplex (Sorgenfrei, 1958 †) - (CLATHURELLIDAE) (FOSSIL)
- simplex, Clio simplex Meyer, 1886 † - (CLIIDAE) (FOSSIL)
- simplex, Procrucibulum simplex J. Perner, 1903 † - (CLISOSPIRIDAE) (FOSSIL)
- simplex, Littoridina simplex H.A. Pilsbry, 1911 - (COCHLIOPIDAE)
- simplex, Tropidebora simplex Wesselingh, 2006 † - (COCHLIOPIDAE) (FOSSIL)
- simplex, Mitrella simplex (M.M. Schepman, 1911) - (COLUMBELLIDAE)
- simplex, Sciteconus algoensis simplex (G.B. II Sowerby, 1858) - (CONIDAE)
- simplex, Tahudrillia simplex Powell, 1942 † - (CONOIDEA (UNASSIGNED)) (FOSSIL)
- simplex, Vexillum simplex R.W. Dunker, 1846 - syn of: Vexillum patulum (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- simplex, Talabrica simplex W. Kobelt, 1886 - syn of: Talabrica bellula (A. Adams, 1854) - (CRASSATELLIDAE)
- simplex, Crassatella simplex W. Kobelt, 1886 - syn of: Talabrica bellula (A. Adams, 1854) - (CRASSATELLIDAE)
- simplex, Cravenoceratoides simplex (Knopp, 1934 †) - (CRAVENOCERATIDAE) (FOSSIL)
- simplex, Creseis simplex Meyer, 1886 † - (CRESEIDAE) (FOSSIL)
- simplex, Crioceratites simplex d'Orbigny, 1840 † - (CRIOCERATITIDAE) (FOSSIL)
- simplex, Luzonia simplex (J.A. Allen & R.E. Morgan, 1981) - (CUSPIDARIIDAE)
- simplex, Neotenoceras simplex Tozer, 1994 † - (CYCLOCELTITIDAE) (FOSSIL)
- simplex, Kufengoceras simplex (J.K. Zhao, 1955 †) - (CYCLOLOBIDAE) (FOSSIL)
- simplex, Boucardicus simplex K.C. Emberton & T.A. Pearce, 1999 - (CYCLOPHORIDAE)
- simplex, Tornatina simplex A. Adams † - syn of: Retusa globosa G. Yamakawa, 1911 † - (CYLICHNIDAE) (FOSSIL)
- simplex, Cyanocyclas simplex W.B. Marshall, 1927 - syn of: Corbicula limosa (W.G. Maton, 1809) - (CYRENIDAE)
- simplex, Gibberula simplex (C.F. Laseron, 1957) - (CYSTISCIDAE)
- simplex, Dactylioceras simplex Fucini, 1935 † - (DACTYLIOCERATIDAE) (FOSSIL)
- simplex, Dentalium simplex O.G. Michelotti, 1861 † - (DENTALIIDAE) (FOSSIL)
- simplex, Desmoceras simplex Van Hoepen, 1921 † - syn of: Desmophyllites diphylloides (E. Forbes, 1846 †) - (DESMOCERATIDAE) (FOSSIL)
- simplex, Mellitestea simplex C.F. Laseron, 1956 - (DIALIDAE)
- simplex, Gomphoceras simplex Barrande, 1865 † - syn of: Mandaloceras simplex (Barrande, 1865 †) - (DIESTOCERATIDAE) (FOSSIL)
- simplex, Plectostoma simplex (H.C. Fulton, 1901) - (DIPLOMMATINIDAE)
- simplex, Arinia simplex J.J. Vermeulen, 1996 - (DIPLOMMATINIDAE)
- simplex, Donax simplex G.B. III Sowerby, 1897 - (DONACIDAE)
- simplex, Micromenia simplex E.H.J. Leloup, 1948 - (DONDERSIIDAE)
- simplex, Drillia simplex W.H. Turton, 1932 - syn of: Anacithara simplex (W.H. Turton, 1932) - (DRILLIIDAE)
- simplex, Ectenolites simplex Flower, 1964 † - syn of: Ectenolites sinuatus Flower, 1964 † - (ELLESMEROCERATIDAE) (FOSSIL)
- simplex, Epitonium simplex (G.B. III Sowerby, 1894) - (EPITONIIDAE)
- simplex, Eulima simplex G.B. III Sowerby, 1897 - (EULIMIDAE)
- simplex, Granulifusus simplex E.A. Smith, 1879 - syn of: Fusinus pauciliratus complex M.A. Snyder, 2000 - (FASCIOLARIIDAE)
- simplex, Fusus simplex E.A. Smith, 1879 - syn of: Fusinus pauciliratus complex M.A. Snyder, 2000 - (FASCIOLARIIDAE)
- simplex, Ficus simplex (A.H.E. Beyrich, 1854 †) - (FICIDAE) (FOSSIL)
- simplex, Flickia simplex Pervinquiere, 1907 † - (FLICKIIDAE) (FOSSIL)
- simplex, Safraites simplex Brühwiler & Bucher, 2012 † - (GALFETTITIDAE) (FOSSIL)
- simplex, Geopeltis simplex (Voltz, 1840 †) - (GEOPELTIDIDAE) (FOSSIL)
- simplex, Girtyoceras simplex Moore, 1946 † - (GIRTYOCERATIDAE) (FOSSIL)
- simplex, Cuneamya simplex (Portlock) Reed † - (GRAMMYSIIDAE) (FOSSIL)
- simplex, Stearoceras simplex A. Hyatt, 1893 † - (GRYPOCERATIDAE) (FOSSIL)
- simplex, Hamites simplex (A.V.M.D. D'Orbigny, 1842 †) - (HAMITIDAE) (FOSSIL)
- simplex, Stomohamites simplex (A.V.M.D. D'Orbigny †) - (HAMITIDAE) (FOSSIL)
- simplex, Securiconus simplex (Yü, 1979 †) - (HELCIONELLIDAE) (FOSSIL)
- simplex, Holopea simplex E.F.R.K. Koken & J. Perner, 1925 † - (HOLOPEIDAE) (FOSSIL)
- simplex, Discohoplites simplex B.H. Wright & S.H. Wright, 1949 † - (HOPLITIDAE) (FOSSIL)
- simplex, Anacithara simplex (W.H. Turton, 1932) - (HORAICLAVIDAE)
- simplex, Hydrobia simplex (A. Fuchs, 1877 †) - (HYDROBIIDAE) (FOSSIL)
- simplex, Pyrgulopsis simplex R. Hershler, 1988 - (HYDROBIIDAE)
- simplex, Pyrgula simplex B.M. Logvinenko & Y.I. Starobogatov, 1968 - (HYDROBIIDAE)
- simplex, Hypseloconus simplex Lochman & F.M. Duncan, 1944 † - (HYPSELOCONIDAE) (FOSSIL)
- simplex, Rissopsis simplex A.W.B. Powell, 1927 - (IRAVADIIDAE)
- simplex, Neocypricardinia simplex Zhang & Pojeta, 1986 † - (KALENTERIDAE) (FOSSIL)
- simplex, Stutchburia simplex (J.B.M. Dana, 1847 †) - (KALENTERIDAE) (FOSSIL)
- simplex, Sabaudiella simplex Busnardo, 2003 † - (LEPTOCERATOIDIDAE) (FOSSIL)
- simplex, Helminthochiton simplex W.J. Raymond, 1910 † - (LEPTOCHITONIDAE) (FOSSIL)
- simplex, Leptochiton simplex H.F. Nierstrasz, 1905 - syn of: Leptochiton alveolus (S.L. Lovén, 1846) - (LEPTOCHITONIDAE)
- simplex, Dichostasia simplex E.L. Yochelson, 1956 † - (LIOTIIDAE) (FOSSIL)
- simplex, Litiopa simplex M. Yokoyama, 1927 † - syn of: Alaba picta (A. Adams, 1861) - (LITIOPIDAE) (FOSSIL)
- simplex, Littorina simplex L.A. Reeve, 1857 - syn of: Littorina saxatilis (A.G. Olivi, 1792) - (LITTORINIDAE)
- simplex, Lottia simplex H.A. Pilsbry, 1891 - syn of: Lottia leucopleura (J.F. Gmelin, 1791) - (LOTTIIDAE)
- simplex, Aulacostrepsis simplex J. Perner, 1907 † - (LOXONEMATIDAE) (FOSSIL)
- simplex, Prophetilora simplex (L.A. Reeve, 1850) - (LUCINIDAE)
- simplex, Lucina simplex Martin, 1879 † - (LUCINIDAE) (FOSSIL)
- simplex, Lucina simplex L.A. Reeve, 1850 - syn of: Prophetilora simplex (L.A. Reeve, 1850) - (LUCINIDAE)
- simplex, Radix simplex (Gorjanovic-Kramberger, 1899 †) - (LYMNAEIDAE) (FOSSIL)
- simplex, Mandaloceras simplex (Barrande, 1865 †) - (MANDALOCERATIDAE) (FOSSIL)
- simplex, Obesotoma simplex (A.T. von Middendorff, 1849) - (MANGELIIDAE)
- simplex, Obesotoma simplex Auct. non A.T. von Middendorff, 1849 - syn of: Obesotoma tenuilirata (W.H. Dall, 1871) - (MANGELIIDAE)
- simplex, Mangelia simplex J.P.S. Grateloup, 1847 - syn of: Mangelia subsida (W.H. Dall, 1881) - (MANGELIIDAE)
- simplex, Obesotoma simplex K. Itô & al., 1986 - syn of: Obesotoma solida (W.H. Dall, 1887) - (MANGELIIDAE)
- simplex, Oenopota simplex A.T. von Middendorff, 1849 - syn of: Obesotoma laevigata (W.H. Dall, 1871) - (MANGELIIDAE)
- simplex, Kargalites simplex Leonova, 1992 † - (MARATHONITIDAE) (FOSSIL)
- simplex, Serrata simplex F. Boyer, 2008 - (MARGINELLIDAE)
- simplex, Mesoginella simplex L.A. Reeve, 1865 - syn of: Mesoginella olivella (L.A. Reeve, 1865) - (MARGINELLIDAE)
- simplex, Bamyaniceras simplex Leonova, 1984 † - (MEDLICOTTIIDAE) (FOSSIL)
- simplex, Owenites simplex Welter, 1922 † - (MELAGATHICERATIDAE) (FOSSIL)
- simplex, Anasibirites simplex Chao, 1959 † - syn of: Juvenites sinuosus Kiparisova, 1947 † - (MELAGATHICERATIDAE) (FOSSIL)
- simplex, Pyrula simplex A.H.E. Beyrich, 1854 † - syn of: Ficus concinnus A.H.E. Beyrich, 1854 † - (MELONGENIDAE) (FOSSIL)
- simplex, Mitra simplex G.B. II Sowerby, 1874 - syn of: Mitra cornicula (C. Linnaeus, 1758) - (MITRIDAE)
- simplex, Modiolopsis simplex J.B.M. Dana, 1847 † - syn of: Stutchburia simplex (J.B.M. Dana, 1847 †) - (MODIOMORPHIDAE) (FOSSIL)
- simplex, Plaxiphora simplex P.P. Carpenter in A. Haddon, 1886 - (MOPALIIDAE)
- simplex, Hormotoma simplex Wilson, 1932 † - (MURCHISONIIDAE) (FOSSIL)
- simplex, Murchisonia simplex McCoy † - (MURCHISONIIDAE) (FOSSIL)
- simplex, Enatimene simplex (C. Hedley, 1903) - (MURICIDAE)
- simplex, Mya simplex F.S. Holmes, 1858 - syn of: Basterotia elliptica (C.A. Récluz, 1850) - (MYIDAE)
- simplex, Lithophaga simplex (T. Iredale, 1939) - (MYTILIDAE)
- simplex, Leiosolenus simplex T. Iredale, 1939 - syn of: Lithophaga simplex (T. Iredale, 1939) - (MYTILIDAE)
- simplex, Bullia simplex Martin, 1879 † - (NASSARIIDAE) (FOSSIL)
- simplex, Austronassaria simplex C.F. Laseron, 1956 - syn of: Nassarius jonasii (R.W. Dunker, 1846) - (NASSARIIDAE)
- simplex, Nassa simplex E.A. Smith, 1880 - syn of: Nassarius tango F. Scarabino, 2004 - (NASSARIIDAE)
- simplex, Natica simplex G.B. III Sowerby, 1897 - (NATICIDAE)
- simplex, Natica simplex M.M. Schepman, 1909 - syn of: Natica schepmani K.H.J. Thiele, 1925 - (NATICIDAE)
- simplex, Neomenia simplex L. Salvini-Plawén, 2006 - (NEOMENIIDAE)
- simplex, Theodoxus simplex (A. Fuchs, 1877 †) - (NERITIDAE) (FOSSIL)
- simplex, Neritodryas simplex M.M. Schepman, 1919 - (NERITIDAE)
- simplex, Ataxocerithium simplex J. Marwick, 1928 † - (NEWTONIELLIDAE) (FOSSIL)
- simplex, Notabilitus simplex A.V. Sysoev, 1968 † - (NOTABILITIDAE) (FOSSIL)
- simplex, Nucula simplex G.P. Deshayes, 1842 † - (NUCULIDAE) (FOSSIL)
- simplex, Nucula simplex A. Adams, 1856 - syn of: Ennucula obliqua (J.B.P.A. Lamarck, 1819) - (NUCULIDAE)
- simplex, Odontostomus simplex (K.H.J. Thiele, 1906) - (ODONTOSTOMIDAE)
- simplex, Macrodontes simplex K.H.J. Thiele, 1906 - syn of: Odontostomus simplex (K.H.J. Thiele, 1906) - (ODONTOSTOMIDAE)
- simplex, Olivella simplex (W.H. Pease, 1868) - (OLIVELLIDAE)
- simplex, Olivella simplex W.H. Pease, 1868 - syn of: Olivella simplex (W.H. Pease, 1868) - (OLIVELLIDAE)
- simplex, Olivellopsis simplex W.H. Pease, 1868 - syn of: Olivella simplex (W.H. Pease, 1868) - (OLIVIDAE)
- simplex, Janoliva simplex W.H. Pease, 1868 - syn of: Olivella simplex (W.H. Pease, 1868) - (OLIVIDAE)
- simplex, Belloliva simplex W.H. Pease, 1868 - syn of: Olivella simplex (W.H. Pease, 1868) - (OLIVIDAE)
- simplex, Oliva simplex L.H. Hupé, 1854 † - syn of: Lamprodomina dimidiata (J. de C. Sowerby, 1846 †) - (OLIVIDAE) (FOSSIL)
- simplex, Omalogyra simplex (O.G. Costa, 1861) - (OMALOGYRIDAE)
- simplex, Richardsonoceras simplex Billings, 1857 † - syn of: Richardsonoceras fallax (Billings, 1857 †) - (ONCOCERATIDAE) (FOSSIL)
- simplex, Cyrtoceras simplex Billings, 1857 † - syn of: Richardsonoceras fallax (Billings, 1857 †) - (ONCOCERIDA (unassigned)) (FOSSIL)
- simplex, Ophioceras simplex (Barrande, 1865 †) - (OPHIDIOCERATIDAE) (FOSSIL)
- simplex, Orthonema simplex Mazaev, 2002 † - (ORTHONEMATIDAE) (FOSSIL)
- simplex, Parallelodon simplex (Tornquist, 1896 †) - (PARALLELODONTIDAE) (FOSSIL)
- simplex, Popanoceras simplex C. Chen, 1977 † - (PARAPOPANOCERATIDAE) (FOSSIL)
- simplex, Kotakaia simplex A.G. Beu, 1988 † - (PERSONIDAE) (FOSSIL)
- simplex, Ancylus simplex BucHoz, 1771 - syn of: Ancylus fluviatilis O.F. Müller, 1774 - (PLANORBIDAE)
- simplex, Chersaecia simplex (G.A. Solem, 1966) - (PLECTOPYLIDAE)
- simplex, Goniobasis simplex (T. Say, 1825) - (PLEUROCERIDAE)
- simplex, Plicatula simplex A.A. Gould, 1861 - syn of: Plicatula regularis R.A. Philippi, 1849 - (PLICATULIDAE)
- simplex, Pneumodermopsis simplex (J.E.V. Boas, 1886) - (PNEUMODERMATIDAE)
- simplex, Tambja simplex J.A. Ortea & L. Moro, 1998 - (POLYCERIDAE)
- simplex, Surites simplex (Bogoslowsky, 1902 †) - (POLYPTYCHITIDAE) (FOSSIL)
- simplex, Chondropomorus simplex L. Pfeiffer - (POMATIIDAE)
- simplex, Blanfordia japonica simplex H.A. Pilsbry, 1902 - (POMATIOPSIDAE)
- simplex, Bittiscala simplex (P. Marshall, 1917 †) - (POTAMIDIDAE) (FOSSIL)
- simplex, Biseriodonta simplex Fang & Cope 2004 † - (PRAENUCULIDAE) (FOSSIL)
- simplex, Eocanites simplex Bockwinkel & Ebbighausen, 2006 † - (PROLECANITIDAE) (FOSSIL)
- simplex, Prolobites simplex W.J. Raymond, 1909 † - syn of: Raymondiceras simplex (W.J. Raymond, 1909 †) - (PROLOBITIDAE) (FOSSIL)
- simplex, Cyclopecten simplex A.E. Verrill, 1897 - (PROPEAMUSSIIDAE)
- simplex, Proptychites simplex (Spath, 1935 †) - (PROPTYCHITIDAE) (FOSSIL)
- simplex, Pseudaspidites simplex Chao, 1959 † - syn of: Pseudaspidites muthianus (Krafft & Diener, 1909 †) - (PROPTYCHITIDAE) (FOSSIL)
- simplex, Escharendoceras simplex Flower, 1956 † - (PROTEROCAMEROCERATIDAE) (FOSSIL)
- simplex, Gari simplex G.B. III Sowerby, 1894 - syn of: Pseudopsammobia simplex (G.B. III Sowerby, 1894) - (PSAMMOBIIDAE)
- simplex, Eotissotia simplex Barber, 1957 † - (PSEUDOTISSOTIIDAE) (FOSSIL)
- simplex, Pterotheca simplex Reed, 1909 † - (PTEROTHECIDAE) (FOSSIL)
- simplex, Pupilla simplex É.A.A. Locard - syn of: Pupilla muscorum (C. Linnaeus, 1758) - (PUPILLIDAE)
- simplex, Necopupina simplex (H.C. Fulton, 1906) - (PUPINIDAE)
- simplex, Megastomia simplex (G.F. Angas, 1871) - (PYRAMIDELLIDAE)
- simplex, Odostomia simplex Lea, 1843 † - (PYRAMIDELLIDAE) (FOSSIL)
- simplex, Turbonilla simplex G.P. Deshayes, 1874 - (PYRAMIDELLIDAE)
- simplex, Agatha simplex (G.F. Angas, 1871) - (PYRAMIDELLIDAE)
- simplex, Eulimella simplex (A.V.M.D. D'Orbigny, 1841) - (PYRAMIDELLIDAE)
- simplex, Ranella simplex J. Noszky, 1940 - syn of: Ranella olearium (C. Linnaeus, 1758) - (RANELLIDAE)
- simplex, Relichna simplex (É.A.A. Locard, 1897) - (RETUSIDAE)
- simplex, Relichna simplex R. Murdoch & H.H. Suter, 1906 - syn of: Relichna simplex (É.A.A. Locard, 1897) - (RETUSIDAE)
- simplex, Rimella simplex W.M. Gabb, 1864 † - syn of: Cowlitzia supraplicata (W.M. Gabb, 1864 †) - (RIMELLIDAE) (FOSSIL)
- simplex, Onoba simplex (A.W.B. Powell, 1927) - (RISSOIDAE)
- simplex, Pusillina radiata simplex (R.A. Philippi, 1844) - (RISSOIDAE)
- simplex, Rostellaria simplex A.V.M.D. D'Orbigny, 1843 † - syn of: Graciliala simplex (A.V.M.D. A.V.M.D. D'Orbigny, 1843 †) - (ROSTELLARIIDAE) (FOSSIL)
- simplex, Hyalosagda simplex (H.A. Pilsbry & A.P. Brown, 1910) - (SAGDIDAE)
- simplex, Setigloma simplex (E.A. Smith, 1885) - (SAREPTIDAE)
- simplex, Scaphites simplex (Jukes-Brown 1875 †) - (SCAPHITIDAE) (FOSSIL)
- simplex, Ilsanella simplex (C. Chen & Zhang, 1980 †) - (SCENELLIDAE) (FOSSIL)
- simplex, Sukashitrochus simplex K. Bandel, 1998 - syn of: Sukashitrochus morleti (J.C.H. Crosse, 1880) - (SCISSURELLIDAE)
- simplex, Halystina simplex (K.H. Barnard, 1963) - (SEGUENZIIDAE)
- simplex, Asthelys simplex (R.B. Watson, 1879) - (SEGUENZIIDAE)
- simplex, Adeuomphalus simplex O.G. Costa, 1861 - syn of: Omalogyra simplex (O.G. Costa, 1861) - (SEGUENZIOIDEA (unassigned))
- simplex, Leptomya simplex J. Marwick, 1926 † - (SEMELIDAE) (FOSSIL)
- simplex, Ervilia simplex C.F. Laseron, 1953 - syn of: Rochefortina sandwichensis (E.A. Smith, 1885) - (SEMELIDAE)
- simplex, Amphidesma simplex A. Adams & L.A. Reeve, 1850 - syn of: Semele pulchra I, 1832 - (SEMELIDAE)
- simplex, Cirsonella simplex A.W.B. Powell, 1937 - (SKENEIDAE)
- simplex, Leptoptygma simplex (Knight, 1931 †) - (SOLENISCIDAE) (FOSSIL)
- simplex, Sonninia simplex Buckman † - (SONNINIIDAE) (FOSSIL)
- simplex, Pisidium simplex V. Sterki, 1905 - (SPHAERIIDAE)
- simplex, Parvedentulina simplex K.C. Emberton, 2002 - (STREPTAXIDAE)
- simplex, Leptinaria simplex (R.J.L. Guppy, 1868) - (SUBULINIDAE)
- simplex, Papusuccinea simplex (L. Pfeiffer, 1854) - (SUCCINEIDAE)
- simplex, Pseudopsammobia simplex (G.B. III Sowerby, 1894) - (TELLINIDAE)
- simplex, Tellina simplex H. Adams, 1870 - syn of: Tellina inflata J.F. Gmelin, 1791 - (TELLINIDAE)
- simplex, Terebra simplex Telegdi Roth, 1914 † - (TEREBRIDAE) (FOSSIL)
- simplex, Laevihastula simplex (T.A. Conrad, 1830 †) - (TEREBRIDAE) (FOSSIL)
- simplex, Terebra simplex P.P. Carpenter, 1865 - syn of: Terebra hemphilli E.G. Vanatta, 1924 - (TEREBRIDAE)
- simplex, Terebra simplex T.A. Conrad, 1830 † - syn of: Laevihastula simplex (T.A. Conrad, 1830 †) - (TEREBRIDAE) (FOSSIL)
- simplex, Thyasira simplex (A.E. Verrill & K.J. Bush, 1898) - (THYASIRIDAE)
- simplex, Teinostoma simplex É.A. Benoist, 1874 † - (TORNIDAE) (FOSSIL)
- simplex, Anticlimax simplex F. Rubio & E. Rolán, 2014 - (TORNIDAE)
- simplex, Tornoceras simplex (von Buch, 1832 †) - (TORNOCERATIDAE) (FOSSIL)
- simplex, Acremodontina simplex (A.W.B. Powell, 1937) - (TROCHACLIDIDAE)
- simplex, Charisma simplex (C.F. Laseron, 1954) - (TROCHIDAE)
- simplex, Tryblidium simplex R.P. Whitfield, 1886 † - (TRYBLIDIIDAE) (FOSSIL)
- simplex, Pleurotoma simplex A.T. von Middendorff, 1849 - syn of: Obesotoma simplex (A.T. von Middendorff, 1849) - (TURRIDAE)
- simplex, Mesalia opalina simplex É.A.A. Locard, 1897 - (TURRITELLIDAE)
- simplex, Unio simplex I. Lea, 1845 - syn of: Ptychobranchus greenii (T.A. Conrad, 1834) - (UNIONIDAE)
- simplex, Microceramus simplex (L. Pfeiffer, 1863) - (UROCOPTIDAE)
- simplex, Zonitarion simplex J.J. Van Mol, 1970 - (UROCYCLIDAE)
- simplex, Vascoceras simplex Barber, 1957 † - (VASCOCERATIDAE) (FOSSIL)
- simplex, Dosinia simplex S.C.T. Hanley, 1845 - syn of: Dosinia dunkeri (R.A. Philippi, 1844) - (VENERIDAE)
- simplex, Dosinia simplex S.C.T. Hanley, 1845 - syn of: Dosinia dunkeri (R.A. Philippi, 1844) - (VENERIDAE)
- simplex, Dosinia simplex A. Adams, 1856 - syn of: Dosinia angulosa (R.A. Philippi, 1847) - (VENERIDAE)
- simplex, Columella simplex A.A. Gould, 1890 - syn of: Columella edentula (J.P.R. Draparnaud, 1805) - (VERTIGINIDAE)
- simplex, Pseudaulicina simplex Furon & Kouriatchy, 1948 † - (VOLUTIDAE) (FOSSIL)
- simplex acontes, Anomia simplex acontes J.E. Gray, 1850 - (ANOMIIDAE)
- simplex alfredensis, Vexillum simplex alfredensis W.H. Turton, 1932 - syn of: Vexillum patulum (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- simplex cimarronensis, Stomohamites simplex cimarronensis Kauffman & Powel † - (HAMITIDAE) (FOSSIL)
- simplex convexior, Mitiperua simplex convexior C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- simplex crawfordi, Archachatina simplex crawfordi P.M.A. Morelet, 1889 - (ACHATINIDAE)
- simplex paquettensis, Hormotoma simplex paquettensis Wilson, 1951 † - (MURCHISONIIDAE) (FOSSIL)
- simplex quadrasi, Helicostyla simplex quadrasi J.G. Hidalgo, 1886 - (BRADYBAENIDAE)
- simplex radiella, Onoba simplex radiella F. Nordsieck, 1972 - (RISSOIDAE)
- simplex saldontiana, Natica simplex saldontiana P. Bartsch, 1915 - syn of: Natica simplex G.B. III Sowerby, 1897 - (NATICIDAE)
- simplex subconoidea, Basisulcata simplex subconoidea (A.V.M.D. D'Orbigny, 1852 †) - (ARCHITECTONICIDAE) (FOSSIL)
- simplex subcostata, Mitiperua simplex subcostata C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- simplex walleri, Luzonia simplex walleri F.R. Bernard, 1989 - syn of: Luzonia chilensis (W.H. Dall, 1890) - (CUSPIDARIIDAE)
- simplexa, Lopha simplexa Zhang, 1977 † - (OSTREIDAE) (FOSSIL)
- simplexiformis, Anomia simplexiformis J. Brown, 1905 † - (ANOMIIDAE) (FOSSIL)
- simplica, Tectaplica simplica B. Wade, 1916 † - (VOLUTIDAE) (FOSSIL)
- Simplicaria, syn of: Genus Charopa J.A. Albers, 1860 (CHAROPIDAE)
- simplicata, Euchondria simplicata F.S. Xu, 1980 † - syn of: Euchondria weanensis G.B. Campbell & H. Engel, 1963 † - (EUCHONDRIIDAE) (FOSSIL)
- simplicata, Bela simplicata É.A.A. Locard, 1896 - (MANGELIIDAE)
- simplicata, Glyptoleda simplicata C.O. Waterhouse, 1964 † - (NUCULANIDAE) (FOSSIL)
- simplicatum, Oxynoticeroides simplicatum Dommergues & al., 1986 † - (OXYNOTICERATIDAE) (FOSSIL)
- Simplicervix, Subgenus Brachypodella (Simplicervix) H.A. Pilsbry, 1903 (UROCOPTIDAE)
- simplicicingula, Tropidoturris simplicicingula (K.H. Barnard, 1958) - (BORSONIIDAE)
- simplicicingula pondo, Tropidoturris simplicicingula pondo R.N. Kilburn, 1986 - (BORSONIIDAE)
- Simplicicordia, Genus Simplicicordia J.T. Kuroda & T. Habe, 1971 (VERTICORDIIDAE)
- simplicicosta, Hysteroceras simplicicosta Spath, 1934 † - (BRANCOCERATIDAE) (FOSSIL)
- simplicicostata, Subthurmannia simplicicostata (Mazenot †) - (NEOCOMITIDAE) (FOSSIL)
- simplicidentata, Intihuarella simplicidentata T.M. Sánchez & N.E. Vaccari, 2003 † - (INTIHUARELLIDAE) (FOSSIL)
- simplicifilis, Gregariella petagnae simplicifilis K.H. Barnard, 1964 - (MYTILIDAE)
- Simplicifusus, syn of: Genus Granulifusus J.T. Kuroda & T. Habe, 1954 (FASCIOLARIIDAE)
- simplicilabre, Rhiostoma simplicilabre L. Pfeiffer, 1862 - (CYCLOPHORIDAE)
- simplicimum, Elasmias simplicimum C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- Simplicioceras, Subgenus Eutrephoceras (Simplicioceras) † (NAUTILIDAE) (FOSSIL)
- simplicior, Sveltia varicosa simplicior F. Sacco, 1894 † - (CANCELLARIIDAE) (FOSSIL)
- simplicior, Lepetella simplicior (J.C. Melvill, 1912) - (LEPETELLIDAE)
- simplicior, Perrinites simplicior Leonova, 1983 † - (PERRINITIDAE) (FOSSIL)
- simplicis, Tchuranitheca simplicis A.V. Sysoev, 1968 † - (TCHURANITHECIDAE) (FOSSIL)
- simplicissima, Costellaria simplicissima M.M. Schepman, 1911 - syn of: Tosapusia duplex (W.O. Cernohorsky, 1982) - (COSTELLARIIDAE)
- simplicissima, Monetaria simplicissima F.P. Jousseaume 1884 † - (CYPRAEIDAE) (FOSSIL)
- simplicissima, Paraspirotropis simplicissima (W.H. Dall, 1907) - (MANGELIIDAE)
- simplicissima, Marginella simplicissima Martin, 1879 † - (MARGINELLIDAE) (FOSSIL)
- simplicissima, Mitra simplicissima Cooper, 1894 † - (MITRIDAE) (FOSSIL)
- simplicissima, Mitra simplicissima M.M. Schepman, 1911 - syn of: Tosapusia duplex (W.O. Cernohorsky, 1982) - (MITRIDAE)
- simplicissima, Aliceia simplicissima (K.H.J. Thiele, 1925) - (RAPHITOMIDAE)
- simplicissima, Rissoina simplicissima K.H.J. Thiele, 1925 - (RISSOINIDAE)
- simplicissima, Semele simplicissima H.A. Pilsbry & H.N. Lowe, 1932 - syn of: Semele pallida (G.B. I Sowerby, 1833) - (SEMELIDAE)
- simplicissima, Anticlimax simplicissima F. Rubio & E. Rolán, 2014 - (TORNIDAE)
- simplicissimum, Tornoceras simplicissimum Sobolew, 1914 † - syn of: Protornoceras simplificatum (Sobolew, 1914 †) - (TORNOCERATIDAE) (FOSSIL)
- simplicissimus, Cheiloceras simplicissimus Sobolew, 1914 † - syn of: Nehdenites planilobus (C.L.F. von Sandberger, 1851 †) - (CHEILOCERATIDAE) (FOSSIL)
- simplicissimus, Conus simplicissimus Pilsbry & Johnson, 1917 † - (CONIDAE) (FOSSIL)
- simplicissimus, Stenosemus simplicissimus (K.H.J. Thiele, 1906) - (ISCHNOCHITONIDAE)
- Simplicistrigilla, Subgenus Strigilla (Simplicistrigilla) Olsson, 1961 (TELLINIDAE)
- simplicita, Monacha simplicita W. Kobelt, 1879 - syn of: Eutheba cantiana (G. Montagu, 1803) - (HYGROMIIDAE)
- simplicitatis, Galfettites simplicitatis Brayard & Bucher, 2008 † - (GALFETTITIDAE) (FOSSIL)
- simplicius, Pecten simplicius T.A. Conrad, 1860 † - (PECTINIDAE) (FOSSIL)
- simplicius, Tornoceras simplicius Sobolew, 1914 † - syn of: Protornoceras simplificatum (Sobolew, 1914 †) - (TORNOCERATIDAE) (FOSSIL)
- simplicius rotundatum, Tornoceras simplicius rotundatum Sobolew, 1914 † - syn of: Protornoceras simplificatum (Sobolew, 1914 †) - (TORNOCERATIDAE) (FOSSIL)
- Simplicodolium, syn of: Genus Eudolium W.H. Dall, 1889 (TONNIDAE)
- Simplicoglabella, Genus Simplicoglabella F. Sacco, 1890 (MARGINELLIDAE)
- Simplicordia, syn of: Genus Simplicicordia J.T. Kuroda & T. Habe, 1971 (VERTICORDIIDAE)
- simplicosta, Pisinna tumida simplicosta W.F. Ponder & E.K. Yoo, 1976 - (ANABATHRIDAE)
- simplicostatum, Emperoceras simplicostatum R.P. Whitfield, 1902 † - syn of: Didymoceras nebrascense (F.B. Meek & Hayden, 1856 †) - (NOSTOCERATIDAE) (FOSSIL)
- simplicostus, Neocyclotus simplicostus F.G. Thompson, 1969 - (NEOCYCLOTIDAE)
- simplicula, Ampullaria simplicula J.F. Mabille, 1889 - (AMPULLARIIDAE)
- Simplicula, Subgenus Canariella (Simplicula) C.E. Ponte-Lira & M.R. Alonso, 1997 (CANARIELLIDAE)
- simplicula, Gasulliella simplicula (P.M.A. Morelet, 1845) - (HELICODONTIDAE)
- simplicula, Onoba simplicula T.A. de M. Monterosato, 1890 - (RISSOIDAE)
- simpliculus, Bostryx simpliculus L. Pfeiffer, 1855 - (BULIMULIDAE)
- simplicus, Aviculopecten simplicus C. Chen & al., 1974 † - (AVICULOPECTINIDAE) (FOSSIL)
- simplificatum, Protornoceras simplificatum (Sobolew, 1914 †) - (KIRSOCERATIDAE) (FOSSIL)
- simplificatum, Tornoceras simplificatum Sobolew, 1914 † - syn of: Protornoceras simplificatum (Sobolew, 1914 †) - (TORNOCERATIDAE) (FOSSIL)
- simplificatum rotundatum, Tornoceras simplificatum rotundatum Sobolew, 1914 † - syn of: Protornoceras simplificatum (Sobolew, 1914 †) - (TORNOCERATIDAE) (FOSSIL)
- simplificatum subacutum, Tornoceras simplificatum subacutum Sobolew, 1914 † - syn of: Protornoceras simplificatum (Sobolew, 1914 †) - (TORNOCERATIDAE) (FOSSIL)
- simplis, Protocuspidaria simplis J.A. Allen & R.E. Morgan, 1981 - (PROTOCUSPIDARIIDAE)
- Simplischnochiton, Subgenus Ischnochiton (Simplischnochiton) R.A. Van Belle, 1974 (ISCHNOCHITONIDAE)
- Simplisiphonaria, Subgenus Siphonaria (Simplisiphonaria) B. Hubendick, 1945 (SIPHONARIIDAE)
- Simplum, syn of: Genus Septa G. Perry, 1810 (RANELLIDAE)
- simpronia, Columbella simpronia P.L. Duclos, 1846 - syn of: Columbella rustica (C. Linnaeus, 1758) - (COLUMBELLIDAE)
- Simpsonaias, syn of: Genus Simpsoniconcha L.S. Frierson, 1914 (UNIONIDAE)
- Simpsonella, Genus Simpsonella T.D.A. Cockerell, 1903 (UNIONIDAE)
- simpsonensis, Cerithium simpsonensis L.W. Stephenson, 1941 † - (CERITHIIDAE) (FOSSIL)
- simpsoni, Agassiceras simpsoni C.T. Simpson, 1843 † - (ARIETITIDAE) (FOSSIL)
- simpsoni, Youngibelus simpsoni (Mayer-Eymar, 1883) † - (BELEMNITIDA (UNASSIGNED)) (FOSSIL)
- simpsoni, Cerodrillia simpsoni (W.H. Dall, 1887) - (DRILLIIDAE)
- simpsoni, Gadila simpsoni J. Henderson, 1920 - (GADILIDAE)
- simpsoni, Pyrgodomus simpsoni (C.M.F. Ancey, 1886) - (HELICINIDAE)
- simpsoni, Mutela simpsoni C.M.F. Ancey, 1894 - syn of: Mutela alata (I. Lea, 1864) - (IRIDINIDAE)
- simpsoni, Idas simpsoni (J.T. Marshall, 1900) - (MYTILIDAE)
- simpsoni, Poteria simpsoni (P. Bartsch, 1942) - (NEOCYCLOTIDAE)
- simpsoni, Oleacina smithiana simpsoni (H.A. Pilsbry, 1907) - (OLEACINIDAE)
- simpsoni, Australonema simpsoni Cook & Camilleri, 1997 † - (ORIOSTOMATIDAE) (FOSSIL)
- simpsoni, Liguus fasciatus simpsoni H.A. Pilsbry, 1921 - (ORTHALICIDAE)
- simpsoni, Oxynoticeras simpsoni (C.T. Simpson, 1843 †) - (OXYNOTICERATIDAE) (FOSSIL)
- simpsoni, Millerelix simpsoni (H.A. Pilsbry & J.H. Ferriss, 1907) - (POLYGYRIDAE)
- simpsoni, Torrellisca simpsoni J. Henderson & P. Bartsch, 1920 - (POMATIIDAE)
- simpsoni, Opisthosiphon simpsoni P. Bartsch, 1946 - (POMATIIDAE)
- simpsoni, Psiloceras simpsoni (Portlock, 1843 †) - (PSILOCERATIDAE) (FOSSIL)
- simpsoni, Turbonilla simpsoni W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- simpsoni, Stenogyra simpsoni H.A. Pilsbry, 1906 - (SUBULINIDAE)
- simpsoni, Lamellaxis simpsoni (C.M.F. Ancey, 1886) - (SUBULINIDAE)
- simpsoni, Pleurotoma simpsoni C.T. Simpson, 1886 - syn of: Cerodrillia simpsoni (W.H. Dall, 1887) - (TURRIDAE)
- simpsoni, Unio simpsoni B.H. Wright, 1888 - syn of: Elliptio jayensis I. Lea, 1838 - (UNIONIDAE)
- simpsoni, Pitar simpsoni (W.H. Dall, 1895) - (VENERIDAE)
- simpsoni, Paravitrea simpsoni (H.A. Pilsbry, 1889) - (ZONITIDAE)
- simpsoni abacoensis, Opisthosiphon simpsoni abacoensis P. Bartsch, 1946 - (POMATIIDAE)
- simpsoni terneroensis, Torrellisca simpsoni terneroensis C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- simpsoni williamsae, Opisthosiphon simpsoni williamsae G.T. Watters & G. Duffy, 2010 - (POMATIIDAE)
- Simpsonia, syn of: Genus Chamberlainia C.T. Simpson, 1900 (UNIONIDAE)
- simpsoniana, Anodonta grandis simpsoniana I. Lea, 1861 - (UNIONIDAE)
- simpsonianus, Glabaris simpsonianus H.A. Pilsbry, 1896 - syn of: Anodontites trapesialis (J.B.P.A. Lamarck, 1818) - (MYCETOPODIDAE)
- simpsonianus, Medionidus simpsonianus B. Walker, 1905 - (UNIONIDAE)
- Simpsonibelus, Genus Simpsonibelus Doyle, 1992 † (BELEMNITIDA (UNASSIGNED)) (FOSSIL)
- Simpsoniconcha, Genus Simpsoniconcha L.S. Frierson, 1914 (UNIONIDAE)
- Simpsonunio, syn of: Genus Lampsilis C.S. Rafinesque, 1820 (UNIONIDAE)
- simpularius, Unio simpularius P.M. Heude, 1884 - syn of: Ptychorhynchus murinum (P.M. Heude, 1883) - (UNIONIDAE)
- SIMPULOPSIDAE Schileyko, 1999 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-ORTHALICOIDEA [Superfamily])
- Simpulopsis, Genus Simpulopsis H.H. Beck, 1837 (SIMPULOPSIDAE)
- Simpulum, syn of: Genus Septa G. Perry, 1810 (RANELLIDAE)
- simrothi, Deroceras simrothi T.D.A. Cockerell, 1893 - syn of: Deroceras reticulatum (O.F. Müller, 1774) - (AGRIOLIMACIDAE)
- simrothi, Mesarion simrothi (K. Künkel, 1909) - (ARIONIDAE)
- simrothi, Microparmarion simrothi W.E. Collinge & H.H. Godwin-Austen, 1895 - (ARIOPHANTIDAE)
- simrothi, Damayantia simrothi W.E. Collinge, 1903 - (ARIOPHANTIDAE)
- simrothi, Pseudaneitea simrothi (H.H. Suter, 1896) - (ATHORACOPHORIDAE)
- simrothi, Naesiotus simrothi (P.H. Reibisch, 1892) - (BULIMULIDAE)
- simrothi, Apiocardia simrothi (W.H. Dall, 1900 †) - (CARDIIDAE) (FOSSIL)
- simrothi, Cochlostoma simrothi C. Pollonera & E. Caziot, 1908 - syn of: Cochlostoma patulum simrothi (C. Pollonera & E. Caziot, 1908) - (COCHLOSTOMATIDAE)
- simrothi, Cochlostoma patulum simrothi (C. Pollonera & E. Caziot, 1908) - (COCHLOSTOMATIDAE)
- simrothi, Helixena simrothi W. Kobelt, 1900 - syn of: Helixena sanctaemariae (P.M.A. Morelet & H. Drouët, 1857) - (HELICIDAE)
- simrothi, Lepidochitona simrothi (K.H.J. Thiele, 1902) - (LEPIDOCHITONIDAE)
- simrothi, Megalopelte simrothi W.A. Lindholm, 1914 - (LIMACIDAE)
- simrothi, Tandonia simrothi P. Hesse, 1923 - (MILACIDAE)
- simrothi, Paraoncidium simrothi (H.P. Plate, 1893) - (ONCHIDIIDAE)
- simrothi, Oncidium simrothi H.P. Plate, 1893 - syn of: Paraoncidium simrothi (H.P. Plate, 1893) - (ONCHIDIIDAE)
- simrothi, Parmacella simrothi J. Germain, 1912 - syn of: Parmacella ibera (K.E.I. von Eichwald, 1841) - (PARMACELLIDAE)
- simrothi, Spirotoxon simrothi B. Verdcourt, 1961 - (UROCYCLIDAE)
- Simrothia, syn of: Genus Limax C. Linnaeus, 1758 (LIMACIDAE)
- Simrothiella, Genus Simrothiella H.A. Pilsbry, 1898 (SIMROTHIELLIDAE)
- SIMROTHIELLIDAE Salvini-Plawen, 1978 - Family (SOLENOGASTRES-SOLENOGASTRES [Subclass]-CAVIBELONIA [Order])
- Simrothula, Genus Simrothula J.W. Thomé, 1976 (VERONICELLIDAE)
- simson, Helix simson L. Pfeiffer, 1852 - syn of: Pleurodonte candescens C.B. Adams, 1850 - (HELICIDAE)
- simsoni, Cystiscus simsoni R. Tate & W.L. May, 1900 - syn of: Cystiscus angasi (J.C.H. Crosse, 1870) - (CYSTISCIDAE)
- simsoni, Marginella simsoni R. Tate & W.L. May, 1900 - syn of: Cystiscus angasi (J.C.H. Crosse, 1870) - (MARGINELLIDAE)
- simsoni, Rissoa simsoni R. Tate & W.L. May, 1900 - syn of: Epigrus cylindraceus (J.E. Tenison-Woods, 1878) - (RISSOIDAE)
- simsoni, Fossarina simsoni J.E. Tenison-Woods, 1875 - syn of: Fossarina petterdi J.C.H. Crosse, 1870 - (TROCHIDAE)
- simsoni, Turbo simsoni J.E. Tenison-Woods, 1876 - syn of: Lunella undulata (J. Lightfoot, 1786) - (TURBINIDAE)
- simsoniana, Fluvidona simsoniana J.W. Brazier, 1875 - syn of: Austropyrgus simsonianus (J.W. Brazier, 1875) - (HYDROBIIDAE)
- simsonianus, Austropyrgus simsonianus (J.W. Brazier, 1875) - (HYDROBIIDAE)
- simula, Bulimus simula P.M.A. Morelet, 1851 - syn of: Simpulopsis simula (P.M.A. Morelet, 1851) - (BULIMULIDAE)
- simula, Simpulopsis simula (P.M.A. Morelet, 1851) - (SIMPULOPSIDAE)
- simulacrum, Achatinella turgida simulacrum H.A. Pilsbry & C.M. Cooke, 1914 - (ACHATINELLIDAE)
- simulacrum, Zemacies simulacrum C.R. Laws, 1935 † - (BORSONIIDAE) (FOSSIL)
- simulacrum, Tomocyclus simulacrum (P.M.A. Morelet, 1849) - (MEGALOMASTOMIDAE)
- simulacrum, Cyclostoma simulacrum P.M.A. Morelet, 1849 - syn of: Tomocyclus simulacrum (P.M.A. Morelet, 1849) - (POMATIIDAE)
- simulacrum, Archierato simulacrum C.R. Laws, 1939 † - (TRIVIIDAE) (FOSSIL)
- simulacrum gracilius, Megalomastoma simulacrum gracilius E.C. Von Martens, 1890 - syn of: Tomocyclus simulacrum (P.M.A. Morelet, 1849) - (MEGALOMASTOMIDAE)
- Simulamerelina, Subgenus Manzonia (Simulamerelina) W.F. Ponder, 1985 (RISSOIDAE)
- simulans, Achatinella vittata simulans L.A. Reeve, 1850 - (ACHATINELLIDAE)
- simulans, Achatina schweinfurthi simulans T.E. Crowley & T. Pain - (ACHATINIDAE)
- simulans, Anarcestes simulans (Barrande, 1865 †) - (ANARCESTIDAE) (FOSSIL)
- simulans, Barbatia simulans R. Tate, 1886 † - (ARCIDAE) (FOSSIL)
- simulans, Astartella simulans Reed, 1936 † - (ASTARTIDAE) (FOSSIL)
- simulans, Scutalus simulans M.I. Hylton-Scott, 1951 - (BULIMULIDAE)
- simulans, Calliostoma simulans B.A. Marshall, 1994 - (CALLIOSTOMATIDAE)
- simulans, Joculator simulans A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- simulans, Delima simulans H.H. Beck, 1837 - syn of: Delima latilabris (J.A. Wagner, 1829) - (CLAUSILIIDAE)
- simulans, Vexillum simulans P. Dautzenberg, 1935 - syn of: Vexillum vulpecula (C. Linnaeus, 1758) - (COSTELLARIIDAE)
- simulans, Thala simulans E.C. Von Martens, 1880 - syn of: Thala secalina (A.A. Gould, 1860) - (COSTELLARIIDAE)
- simulans, Rhinoclama simulans (R. Tate, 1897) - (CUSPIDARIIDAE)
- simulans, Blasicrura simulans F.A. Schilder & M. Schilder, 1940 - syn of: Blasicrura pallidula rhinoceros (S.M. Souverbie, 1865) - (CYPRAEIDAE)
- simulans, Reynesocoeloceras simulans (Fucini, 1905 †) - (DACTYLIOCERATIDAE) (FOSSIL)
- simulans, Praedaraelites simulans Kullmann, 1962 † - syn of: Epicanites dangeardi Pareyn, 1961 † - (DARAELITIDAE) (FOSSIL)
- simulans, Liospira simulans (Salter, 1861 †) - (EOTOMARIIDAE) (FOSSIL)
- simulans, Muirheada simulans (Salter †) - (EUOMPHALIDAE) (FOSSIL)
- simulans, Saturnotropis simulans (J. Perner, 1903 †) - (EUOMPHALIDAE) (FOSSIL)
- simulans, Fusinus simulans R. Tate, 1888 † - (FASCIOLARIIDAE) (FOSSIL)
- simulans, Helix simulans C.B. Adams, 1849 - syn of: Guppya gundlachi (L. Pfeiffer, 1839) - (HELICIDAE)
- simulans, Helicina simulans A. Garrett, 1884 - (HELICINIDAE)
- simulans, Kellia simulans E.A. Smith, 1907 - (KELLIIDAE)
- simulans, Loripes simulans R. Tate, 1887 † - (LUCINIDAE) (FOSSIL)
- simulans, Radix andersoniana simulans Subba Rao, 1989 - (LYMNAEIDAE)
- simulans, Sonninites simulans Buckman † - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- simulans, Catazone simulans J. Perner, 1907 † - syn of: Catazone cuneus J. Perner, 1907 † - (MURCHISONIIDAE) (FOSSIL)
- simulans, Uberella simulans (E.A. Smith, 1906) - (NATICIDAE)
- simulans, Calvertia simulans N.I. Andrusov, 1890 † - syn of: Theodoxus stefanescui (C.F. Fontannes, 1887 †) - (NERITIDAE) (FOSSIL)
- simulans, Lacrima simulans C.N. Cate, 1973 - syn of: Pseudosimnia lacrima L.R.L. Simone & C.M. Cunha, 2012 - (OVULIDAE)
- simulans, Partula simulans W.H. Pease, 1866 - syn of: Partula taeniata (O.A.L. Mörch, 1850) - (PARTULIDAE)
- simulans, Cyclonema simulans Ulrich & Scofield, 1897 † - (PLATYCERATIDAE) (FOSSIL)
- simulans, Opisthocoelicum simulans C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- simulans, Syrnola simulans A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- simulans, Chrysallida simulans (G.W. Chaster, 1898) - (PYRAMIDELLIDAE)
- simulans, Alvania simulans É.A.A. Locard, 1886 - (RISSOIDAE)
- simulans, Cingula simulans (E.A. Smith, 1890) - (RISSOIDAE)
- simulans, Sanguinolites simulans Girty, 1910 † - (SANGUINOLITIDAE) (FOSSIL)
- simulans, Tellina simulans C.B. Adams, 1852 - syn of: Tellina regia S.C.T. Hanley, 1844 - (TELLINIDAE)
- simulans, Monodosus simulans F. Rubio & E. Rolán, 2016 - (TORNIDAE)
- simulans, Anticlimax simulans F. Rubio & E. Rolán, 2014 - (TORNIDAE)
- simulans, Cautotriphora simulans (C.R. Laws, 1940 †) - (TRIPHORIDAE) (FOSSIL)
- simulans, Monilea simulans E.A. Smith, 1899 - (TROCHIDAE)
- simulans, Anodonta simulans H. Drouët, 1895 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- simulans, Bloyetia simulans E.C. Von Martens, 1895 - (UROCYCLIDAE)
- simulans, Venus simulans G.B. III Sowerby in C.R. Darwin, 1844 - syn of: Venus verrucosa C. Linnaeus, 1758 - (VENERIDAE)
- simulans meruensis, Bloyetia simulans meruensis K.L. Pfeiffer, 1952 - (UROCYCLIDAE)
- simulante, Sinumelon simulante T. Iredale, 1938 - (CAMAENIDAE)
- simularis, Amastra simularis W.D. Hartman - syn of: Amastra mucronata (W. Newcomb, 1853) - (AMASTRIDAE)
- simularis maura, Amastra simularis maura C.M.F. Ancey - syn of: Amastra mucronata (W. Newcomb, 1853) - (AMASTRIDAE)
- simularis roseotincta, Amastra simularis roseotincta E.R. Sykes - syn of: Amastra mucronata roseotincta E.R. Sykes, 1896 - (AMASTRIDAE)
- simularis semicarnea, Amastra simularis semicarnea C.M.F. Ancey & E.R. Sykes, 1899 - syn of: Amastra mucronata semicarnea C.M.F. Ancey & E.R. Sykes, 1899 - (AMASTRIDAE)
- simulata, Tornatellaea simulata D.C. Solander † - (ACTEONIDAE) (FOSSIL)
- simulata, Xerocrassa simulata (C.G. Ehrenberg, 1831) - (HYGROMIIDAE)
- simulata, Marginella simulata S. Gofas & F. Fernandes, 1994 - (MARGINELLIDAE)
- simulata, Melanopsis simulata P.M. Pallary, 1925 - syn of: Melanopsis arcuata Š. Brusina, 1878 † - (MELANOPSIDAE)
- simulata, Isotriphora simulata B.A. Marshall, 1983 - (TRIPHORIDAE)
- simulata lothari, Xerocrassa simulata lothari H.K. Mienis - (HYGROMIIDAE)
- Simulathena, Genus Simulathena R.S. Houbrick, 1992 (PLANAXIDAE)
- simulator, Achatinella apexfulva simulator H.A. Pilsbry & C.M. Cooke, 1914 - (ACHATINELLIDAE)
- simulator, Cerithiopsis simulator (C.R. Laws, 1939 †) - (CERITHIOPSIDAE) (FOSSIL)
- simulator, Gastrioceras simulator Girty, 1910 † - syn of: Stenolobulites simulator (Girty, 1910 †) - (GASTRIOCERATIDAE) (FOSSIL)
- simulator, Manticoceras simulator (J.W. Hall, 1874 †) - (GEPHUROCERATIDAE) (FOSSIL)
- simulator, Goniatites simulator J.W. Hall, 1874 † - syn of: Manticoceras simulator (J.W. Hall, 1874 †) - (GONIATITIDAE) (FOSSIL)
- simulator, Hammatoceras simulator Monestier, 1921 † - (HAMMATOCERATIDAE) (FOSSIL)
- simulator, Leiostyla simulator H.A. Pilsbry, 1923 - (LAURIIDAE)
- simulator, Dacrydium simulator C.R. Laws, 1936 † - (MYTILIDAE) (FOSSIL)
- simulator, Stenolobulites simulator (Girty, 1910 †) - (PARAGASTRIOCERATIDAE) (FOSSIL)
- simulator, Paranowakia simulator Alberti, 1993 † - (PARANOWAKIIDAE) (FOSSIL)
- Simulator, Genus Simulator T. Iredale, 1944 (PLANORBIDAE)
- simulator, Tudiclana simulator Finlay & J. Marwick, 1937 † - (TURBINELLIDAE) (FOSSIL)
- simulatrix, Archinacella simulatrix Ulrich & Scofield, 1897 † - (ARCHINACELLIDAE) (FOSSIL)
- simulatrix, Bucania simulatrix Ulrich & Scofield, 1897 † - (BUCANIIDAE) (FOSSIL)
- simulatrix, Ctenodonta simulatrix Ulrich, 1894 † - (CTENODONTIDAE) (FOSSIL)
- simulatrix, Heterospira simulatrix F. Haas, 1953 † - (EULIMIDAE) (FOSSIL)
- simulatrix, Hormotoma simulatrix Billings, 1865 † - syn of: Eroicaspira simulatrix (Billings, 1865 †) - (MURCHISONIIDAE) (FOSSIL)
- simulatrix, Eroicaspira simulatrix (Billings, 1865 †) - (SUBULITIDAE) (FOSSIL)
- simulatrix, Odontocymbiola simulatrix J.H. Leal & P. Bouchet, 1989 - (VOLUTIDAE)
- simulatum, Buccinum simulatum W.H. Dall, 1907 - (BUCCINIDAE)
- simulatum, Uraloceras simulatum Bogoslovskaya, 1997 † - (PARAGASTRIOCERATIDAE) (FOSSIL)
- simuloides, Euomphalus simuloides A.W. Grabau, 1931 † - (EUOMPHALIDAE) (FOSSIL)
- Simulopsis, syn of: Genus Simpulopsis H.H. Beck, 1837 (SIMPULOPSIDAE)
- Simulotrochus, Genus Simulotrochus J.C. Fischer & Weber, 1997 † (EPULOTROCHIDAE) (FOSSIL)
- simum, Mortoniceras simum van Hoepen, 1951 † - syn of: Mortoniceras ornatum van Hoepen, 1944 † - (BRANCOCERATIDAE) (FOSSIL)
- simus, Simotoichites simus S.S. Buckman, 1923 † - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- simus, Securiconus simus Luo & al., 1982 † - syn of: Bemella bella C. Chen & Zhang, 1980 † - (HELCIONELLIDAE) (FOSSIL)
- simus, Microcornus simus Missarzhevsky, 1974 † - (NELEGEROCORNIDAE) (FOSSIL)
- simusyuensis, Valvata simusyuensis (D. Miyadi, 1935) - (VALVATIDAE)
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