- cyma, Ovamactra cyma W.P. Woodring, 1982 † - (MACTRIDAE) (FOSSIL)
- Cymaceras, Genus Cymaceras Quenstedt, 1887 † (OPPELIIDAE) (FOSSIL)
- Cymaclymenia, Genus Cymaclymenia Hyatt , 1884 † (CYMACLYMENIIDAE) (FOSSIL)
- CYMACLYMENIIDAE Hyatt, 1884 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CLYMENIIDA [Order]-CYRTOCLYMENIOIDEA [Superfamily]) (FOSSIL)
- cymaeformis, Crassostrea cymaeformis Bohm, 1926 † - (OSTREIDAE) (FOSSIL)
- Cymahoplites, Genus Cymahoplites Spath, 1922 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- Cymakra, Genus Cymakra J.A. Gardner, 1937 (MITROMORPHIDAE)
- cymata, Amphissa cymata W.H. Dall, 1916 - (COLUMBELLIDAE)
- cymata, Obesotoma cymata W.H. Dall, 1919 - syn of: Obesotoma tenuilirata (W.H. Dall, 1871) - (MANGELIIDAE)
- cymata, Poromya cymata W.H. Dall, 1890 - (POROMYIDAE)
- cymata, Nutricola cymata (W.H. Dall, 1913) - (VENERIDAE)
- cymata, Psephidia cymata auct. non W.H. Dall, 1913 - syn of: Nutricola tantilla (A.A. Gould, 1853) - (VENERIDAE)
- cymata, Psephidia cymata W.H. Dall, 1913 - syn of: Nutricola cymata (W.H. Dall, 1913) - (VENERIDAE)
- cymatera, Sonninia cymatera Buckman † - (SONNINIIDAE) (FOSSIL)
- cymatia, Coryda alauda cymatia (J. Henderson) - (CEPOLIDAE)
- cymatias, Naesiotus cymatias W.H. Dall, 1917 - (BULIMULIDAE)
- cymatias, Kurtzina cymatias (H.A. Pilsbry & H.N. Lowe, 1932) - (MANGELIIDAE)
- Cymatiella, Genus Cymatiella T. Iredale, 1924 (RANELLIDAE)
- CYMATIIDAE - syn of Family: RANELLIDAE
- Cymatilesta, syn of: Genus Cabestana P.F. Röding, 1798 (RANELLIDAE)
- cymatilis, Dermatobranchus cymatilis T.M. Gosliner & S.J. Fahey, 2011 - (ARMINIDAE)
- cymatilis, Olivella cymatilis S.S. Berry, 1958 - (OLIVELLIDAE)
- Cymatioa, Genus Cymatioa S.S. Berry, 1964 (LASAEIDAE)
- cymation, Crassispira cymation W.P. Woodring, 1970 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- cymatium, Hemiplecta cymatium (W.H. Benson, 1873) - (ARIOPHANTIDAE)
- Cymatium, Genus Cymatium P.F. Röding, 1798 (RANELLIDAE)
- cymatius, Latirus cymatius J.S. Schwengel, 1955 - syn of: Polygona angulata (P.F. Röding, 1798) - (FASCIOLARIIDAE)
- Cymatoceras, Genus Cymatoceras Hyatt, 1884 † (CYMATOCERATIDAE) (FOSSIL)
- CYMATOCERATIDAE Spath, 1927 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-NAUTILIDA [Order]-NAUTILITOIDEA [Superfamily]) (FOSSIL)
- Cymatochiton, Genus Cymatochiton Dall , 1882 † (ISCHNOCHITONIDAE) (FOSSIL)
- Cymatocyclas, syn of: Genus Pisidium L. Pfeiffer, 1821 (SPHAERIIDAE)
- cymatodes, Fictonoba cymatodes (J.C. Melvill & R. Standen, 1916) - (BARLEEIIDAE)
- cymatodes, Isomeria cymatodes (L. Pfeiffer, 1852) - (CAMAENIDAE)
- cymatodes, Mesophaedusa cymatodes (H.A. Pilsbry, 1905) - (CLAUSILIIDAE)
- cymatodes, Eucyclotoma cymatodes (R.P.J. Hervier, 1897) - (RAPHITOMIDAE)
- cymatodes, Daphnella cymatodes R.P.J. Hervier, 1897 - syn of: Eucyclotoma cymatodes (R.P.J. Hervier, 1897) - (RAPHITOMIDAE)
- cymatodes, Onoba cymatodes J.C. Melvill & R. Standen, 1916 - syn of: Fictonoba cymatodes (J.C. Melvill & R. Standen, 1916) - (RISSOIDAE)
- Cymatoica, Subgenus Macoma (Cymatoica) W.H. Dall, 1889 (TELLINIDAE)
- cymatoides, Carinodrillia cymatoides J. Gardner, 1938 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- cymatoides, Onoba cymatoides J.C. Melvill & R. Standen, 1916 - syn of: Fictonoba cymatodes (J.C. Melvill & R. Standen, 1916) - (RISSOIDAE)
- Cymatona, syn of: Genus Sassia L.M.D. Bellardi, 1873 (RANELLIDAE)
- Cymatonautilus, Genus Cymatonautilus Spath, 1927 † (CYMATOCERATIDAE) (FOSSIL)
- Cymatonota, Genus Cymatonota Ulrich, 1893 † (MODIOMORPHIDAE) (FOSSIL)
- Cymatopegma, Genus Cymatopegma Pojeta & al., 1977 † (RIBEIRIIDAE) (FOSSIL)
- cymatophora, Guillarmodia cymatophora (H.A. Pilsbry, 1910) - (SPIRAXIDAE)
- Cymatophos, Subgenus Phos (Cymatophos) H.A. Pilsbry & A.A. Olsson, 1941 (NASSARIIDAE)
- cymatoplax, Carychium cymatoplax H.A. Pilsbry, 1901 - (ELLOBIIDAE)
- cymatopleura, Helix cymatopleura J.F. Mabille, 1883 - syn of: Cryptaxis groviana (A.E.J. Férussac, 1823) - (HELICIDAE)
- Cymatopteryx, Subgenus Lydiphnis (Cymatopteryx) H.A. Pilsbry & A.A. Olsson, 1946 (TORNIDAE)
- Cymatospira, Genus Cymatospira Knight, 1942 † (KNIGHTITIDAE) (FOSSIL)
- Cymatosyrinx, Genus Cymatosyrinx W.H. Dall, 1889 (DRILLIIDAE)
- cymatotropis, Lydiphnis cymatotropis H.A. Pilsbry & A.A. Olsson, 1945 - (TORNIDAE)
- Cymatriton, syn of: Genus Monoplex G. Perry, 1811 (RANELLIDAE)
- cymatum, Acanthina cymatum G.B. Sowerby, 1835 - syn of: Mexacanthina lugubris (J. de C. Sowerby, 1821) - (MURICIDAE)
- cymatus, Boreotrophon cymatus W.H. Dall, 1902 - syn of: Boreotrophon truncatus (H. Strøm, 1768) - (MURICIDAE)
- cymba, Sinum cymba K.T. Menke, 1828 - (NATICIDAE)
- cymba, Palaeomutela cymba Liang † - (PALAEOMUTELIDAE) (FOSSIL)
- Cymba, syn of: Genus Cymbium P.F. Röding, 1798 (VOLUTIDAE)
- cymbaeformis, Anadara cymbaeformis (L.A. Reeve, 1844) - (ARCIDAE)
- cymbaeformis, Crepidula cymbaeformis T.A. Conrad, 1844 - (CALYPTRAEIDAE)
- cymbaeformis, Endocostea cymbaeformis Pergament, 1975 † - (INOCERAMIDAE) (FOSSIL)
- cymbaeformis, Goniophora cymbaeformis (Sowerby, 1839 †) - (MODIOMORPHIDAE) (FOSSIL)
- cymbaeformis, Crassostrea cymbaeformis G.B. II Sowerby, 1871 - syn of: Crassostrea gigas (C.P. Thunberg, 1793) - (OSTREIDAE)
- cymbalum, Cystiscus cymbalum (R. Tate, 1878) - (CYSTISCIDAE)
- cymbalum, Haminoea cymbalum (J.R.C. Quoy & J.P. Gaimard, 1832) - (HAMINOEIDAE)
- cymbalum, Haminoea cymbalum J.R.C. Quoy & J.P. Gaimard, 1832 - syn of: Haminoea cymbalum (J.R.C. Quoy & J.P. Gaimard, 1832) - (HAMINOEIDAE)
- cymbalum, Marginella cymbalum R. Tate, 1878 - syn of: Cystiscus cymbalum (R. Tate, 1878) - (MARGINELLIDAE)
- Cymbancilla, syn of: Genus Ancilla J.B.P.A. Lamarck, 1799 (ANCILLARIIDAE)
- cymbellatus, Planotectus cymbellatus E.L. Yochelson, 1956 † - (EUOMPHALIDAE) (FOSSIL)
- cymbiformis, Heteranomia cymbiformis W.G. Maton & T. Rackett, 1807 - syn of: Heteranomia squamula (C. Linnaeus, 1758) - (ANOMIIDAE)
- cymbiformis, Arcestes cymbiformis Wulfen, 1793 † - syn of: Jinyaceras hindostanum (Diener, 1897 †) - (ARCESTIDAE) (FOSSIL)
- cymbiformis, Haminoea cymbiformis P.P. Carpenter, 1856 - (HAMINOEIDAE)
- cymbiformis, Joannites cymbiformis (Wulfen, 1793 †) - (JOANNITIDAE) (FOSSIL)
- cymbiformis, Nautilus cymbiformis Wulfen, 1793 † - syn of: Joannites cymbiformis (Wulfen, 1793 †) - (NAUTILIDAE) (FOSSIL)
- cymbiola, Pycnodonte cymbiola (G.P. Deshayes, 1832 †) - (GRYPHAEIDAE) (FOSSIL)
- cymbiola, Lottia cymbiola A.A. Gould, 1846 - syn of: Scurria variabilis (G.B. I Sowerby, 1839) - (LOTTIIDAE)
- cymbiola, Scurria cymbiola A.A. Gould, 1846 - syn of: Scurria variabilis (G.B. I Sowerby, 1839) - (LOTTIIDAE)
- Cymbiola, Genus Cymbiola W.J. Swainson, 1831 (VOLUTIDAE)
- cymbiola, Cymbiola cymbiola (J.F. Gmelin, 1791) - (VOLUTIDAE)
- Cymbiolacca, Genus Cymbiolacca T. Iredale, 1929 (VOLUTIDAE)
- Cymbiolena, syn of: Genus Cymbiola W.J. Swainson, 1831 (VOLUTIDAE)
- Cymbiolista, Genus Cymbiolista T. Iredale, 1929 (VOLUTIDAE)
- cymbiolista, Cymbiolena cymbiolista T. Iredale, 1931 - syn of: Amoria hunteri (T. Iredale, 1931) - (VOLUTIDAE)
- Cymbites, Genus Cymbites Neumayr , 1878 † (CYMBITIDAE) (FOSSIL)
- CYMBITIDAE Buckman, 1919 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-PSILOCERATOIDEA [Superfamily]) (FOSSIL)
- cymbium, Carinaria cymbium H. Woodward, 1890 - syn of: Carinaria lamarcki F. Péron & C.A. Lesueur, 1810 - (CARINARIIDAE)
- cymbium, Cucurbitula cymbium (L. Spengler, 1783) - (GASTROCHAENIDAE)
- cymbium, Gastrochaena cymbium L. Spengler, 1783 - syn of: Cucurbitula cymbium (L. Spengler, 1783) - (GASTROCHAENIDAE)
- cymbium, Gryphaea cymbium J.B.P.A. Lamarck, 1819 † - (GRYPHAEIDAE) (FOSSIL)
- cymbium, Platyceras cymbium J.W. Hall, 1862 † - (PLATYCERATIDAE) (FOSSIL)
- Cymbium, Genus Cymbium P.F. Röding, 1798 (VOLUTIDAE)
- cymbium, Cymbium cymbium (C. Linnaeus, 1758) - (VOLUTIDAE)
- Cymbophora, Genus Cymbophora Gabb, 1869 † (MACTRIDAE) (FOSSIL)
- Cymbovula, Genus Cymbovula J. Cate, 1974 (OVULIDAE)
- cymbula, Anomia cymbula R. Tate, 1886 † - (ANOMIIDAE) (FOSSIL)
- cymbula, Dreissena cymbula Š. Brusina, 1892 † - (DREISSENIDAE) (FOSSIL)
- cymbula, Scurria cymbula L.H. Hupé, 1854 - syn of: Scurria scurra (R.P. Lesson, 1830) - (LOTTIIDAE)
- cymbula, Modiolus cymbula H.B. Preston, 1908 - syn of: Modiolus auriculatus C.F.F. von Krauss, 1848 - (MYTILIDAE)
- cymbula, Anthraconaia cymbula (Wright) † - (NAIADITIDAE) (FOSSIL)
- cymbula, Crassostrea cymbula (J.B.P.A. Lamarck, 1806 †) - (OSTREIDAE) (FOSSIL)
- Cymbula, Genus Cymbula H. Adams & A. Adams, 1854 (PATELLIDAE)
- cymbula, Carinaropsis cymbula J.W. Hall, 1861 † - (PTEROTHECIDAE) (FOSSIL)
- cymbula, Avicularium cymbula (J.L.M. Defrance, 1817 †) - (TRIDACNIDAE) (FOSSIL)
- Cymbularia, Genus Cymbularia Koken, 1896 † (BELLEROPHONTIDAE) (FOSSIL)
- cymbularia, Bellerophon cymbularia de Sowerby in Murchison, 1839 † - (BELLEROPHONTIDAE) (FOSSIL)
- cymbularia, Patella cymbularia J.B.P.A. Lamarck, 1819 - syn of: Nacella mytilina (G.S. Helbling, 1779) - (PATELLIDAE)
- Cymbulia, Genus Cymbulia F. Péron & C.A. Lesueur, 1810 (CYMBULIIDAE)
- CYMBULIIDAE Gray, 1840 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-THECOSOMATA [Order]-CYMBULIOIDEA [Superfamily])
- Cymbuliopsis, syn of: Genus Corolla W.H. Dall, 1871 (CYMBULIIDAE)
- Cymbulostrea, Subgenus Crassostrea (Cymbulostrea) Vialov, 1936 (OSTREIDAE)
- cymbulus, Aulacoteuthis cymbulus Glasunova, 1969 † - syn of: Aulacoteuthis absolutiformis (Sinzow, 1877 †) - (BELEMNITIDA (unassigned)) (FOSSIL)
- cymbulus, Atys cymbulus P.D. Montfort, 1810 - syn of: Atys naucum (C. Linnaeus, 1758) - (HAMINOEIDAE)
- cymbyla, Scurria cymbyla L.H. Hupé, 1854 - syn of: Scurria scurra (R.P. Lesson, 1830) - (LOTTIIDAE)
- cymella, Caryocorbula cymella (W.H. Dall, 1881) - (CORBULIDAE)
- cymella, Ithycythara cymella (W.H. Dall, 1889) - (MANGELIIDAE)
- cymella, Nucula cymella W.H. Dall, 1886 - syn of: Ennucula pernambucensis (E.A. Smith, 1885) - (NUCULIDAE)
- Cymella, Genus Cymella Meek, 1864 † (POROMYIDAE) (FOSSIL)
- Cymenorhytis, Genus Cymenorhytis Cossmann, 1925 † (CAENOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Cymenorytis, Genus Cymenorytis A.E.M. Cossmann, 1888 † (VANIKORIDAE) (FOSSIL)
- Cymia, Genus Cymia O.A.L. Mörch, 1860 (MURICIDAE)
- cymica, Thais cymica W.H. Dall, 1915 - syn of: Nucella lamellosa cymica W.H. Dall, 1915 - (MURICIDAE)
- cymica, Nucella lamellosa cymica W.H. Dall, 1915 - (MURICIDAE)
- CYMIIDAE - syn of Family: CYAMIIDAE
- cymioides, Urosalpinx cymioides H.A. Pilsbry & A.A. Olsson, 1941 † - (MURICIDAE) (FOSSIL)
- cymmetrica, Lauria cymmetrica Puzanov, 1925 - syn of: Lauria cylindracea (E.M. Da Costa, 1778) - (LAURIIDAE)
- Cymoceras, Genus Cymoceras McCaleb, 1964 † (NEODIMORPHOCERATIDAE) (FOSSIL)
- cymodacea, Phyllaplysia cymodacea K.B. Clark, 1976 - syn of: Phyllaplysia smaragda K.B. Clark, 1977 - (APLYSIIDAE)
- cymodoce, Papuina cymodoce (J.C.H. Crosse, 1869) - (CAMAENIDAE)
- cymodoce, Crockerella cymodoce (W.H. Dall, 1919) - (CLATHURELLIDAE)
- cymodoce, Helix cymodoce J.C.H. Crosse, 1869 - syn of: Papuina cymodoce (J.C.H. Crosse, 1869) - (HELICIDAE)
- cymodocea, Phyllaplysia cymodocea K.B. Clark, 1976 - syn of: Phyllaplysia smaragda K.B. Clark, 1977 - (APLYSIIDAE)
- cymodocealis, Stenochiton cymodocealis E.A. Ashby, 1918 - (ISCHNOCHITONIDAE)
- cymoelia, Haminoea hydatis cymoelia T.A. de M. Monterosato, 1917 - (HAMINOEIDAE)
- cymoelium, Haminoea cymoelium T.A. de M. Monterosato, 1917 - syn of: Haminoea hydatis cymoelia T.A. de M. Monterosato, 1917 - (HAMINOEIDAE)
- Cymostyla, syn of: Genus Nerita C. Linnaeus, 1758 (NERITIDAE)
- cymothoe, Spirotropis cymothoe (W.H. Dall, 1919) - (DRILLIIDAE)
- cymothoe, Cryptogemma cymothoe W.H. Dall, 1919 - syn of: Spirotropis cymothoe (W.H. Dall, 1919) - (TURRIDAE)
- Cymotropis, syn of: Genus Papuina E.C. Von Martens, 1860 (CAMAENIDAE)
- cynara, Flabellina cynara (Er. Marcus & Ev. Marcus, 1967) - (FLABELLINIDAE)
- cynara, Turbinella cynara P.F. Röding, 1798 - syn of: Turbinella angulata (J. Lightfoot, 1786) - (TURBINELLIDAE)
- cynee, Calliotropis cynee C. Vilvens, 2007 - (CALLIOTROPIDAE)
- cynetarum, Ponentina cynetarum H. von Maltzan, 1885 - syn of: Ponentina subvirescens (J.C. Bellamy, 1839) - (HYGROMIIDAE)
- Cynisca, syn of: Genus Cinysca R.N. Kilburn, 1970 (ARENEIDAE)
- Cyniscella, Genus Cyniscella A.E.M. Cossmann, 1918 † (COLLONIIDAE) (FOSSIL)
- cynocephala, Helicostyla satyrus cynocephala (L. Pfeiffer) - (BRADYBAENIDAE)
- cynocephala, Ranularia cynocephala (J.B.P.A. Lamarck, 1816) - (RANELLIDAE)
- cynocephala caribbaeum, Ranularia cynocephala caribbaeum W.J. Clench & H. Turner, 1957 - (RANELLIDAE)
- cynocephalum, Monoplex cynocephalum W.J. Clench & H. Turner, 1957 - syn of: Monoplex wiegmanni (H.E. Anton, 1838) - (RANELLIDAE)
- Cynodonta, syn of: Genus Vasum P.F. Röding, 1798 (TURBINELLIDAE)
- cynophalus, Cymatium cynophalus J.B.P.A. Lamarck, 1816 - syn of: Cymatium lotorium (C. Linnaeus, 1758) - (RANELLIDAE)
- cynthia, Papuina cynthia H.C. Fulton, 1902 - (CAMAENIDAE)
- cynthia, Cerithiopsis cynthia P. Bartsch, 1911 - syn of: Cerithiopsis iota (C.B. Adams, 1845) - (CERITHIOPSIDAE)
- cynthiae, Melongena cynthiae E.J. Petuch, 1990 † - (MELONGENIDAE) (FOSSIL)
- cynthiae, Condylonucula cynthiae R.C. Moore, 1977 - (NUCULIDAE)
- cynthiae, Ostrea cynthiae C.J. Maury, 1912 † - (OSTREIDAE) (FOSSIL)
- cynthiae, Turbonilla cynthiae D. De Jong & H.E. Coomans, 1988 - (PYRAMIDELLIDAE)
- Cyomesus, syn of: Genus Latiromitra É.A.A. Locard, 1897 (COSTELLARIIDAE)
- cyparissias, Helix cyparissias L. Pfeiffer, 1847 - syn of: Xeropicta krynickii (Andrzeiewsky in I. Krynicki, 1833) - (HELICIDAE)
- cyparissias, Xeropicta cyparissias L. Pfeiffer, 1847 - syn of: Xeropicta krynickii (Andrzeiewsky in I. Krynicki, 1833) - (HYGROMIIDAE)
- cypha, Trivia cypha W.P. Woodring 1928 - (TRIVIIDAE)
- cyphastreae, Magilus cyphastreae (Massin, 1983) - syn of: Leptoconchus lamarckii G.P. Deshayes, 1863 - (MURICIDAE)
- cyphogyrus, Chamalycaeus cyphogyrus (J.F. Quadras & O.F. von Möllendorff, 1895) - (CYCLOPHORIDAE)
- cyphoides, Sassia cyphoides (Finlay, 1924 †) - (RANELLIDAE) (FOSSIL)
- cypholena, Anodonta cypholena G. Servain, 1882 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- Cypholioceras, Genus Cypholioceras Buckman, 1899 † (GRAPHOCERATIDAE) (FOSSIL)
- cyphoma, Nipponaphera cyphoma P. Bouchet & R.E. Petit, 2002 - (CANCELLARIIDAE)
- Cyphoma, Genus Cyphoma P.F. Röding, 1798 (OVULIDAE)
- Cyphonia, syn of: Genus Cyphoma P.F. Röding, 1798 (OVULIDAE)
- Cyphonochelus, syn of: Genus Siphonochelus F.P. Jousseaume, 1880 (MURICIDAE)
- Cyphonochelus, syn of: Genus Typhis P.D. Montfort, 1810 (MURICIDAE)
- Cyphonochilus, syn of: Genus Typhis P.D. Montfort, 1810 (MURICIDAE)
- cyphonotus, Strombina cyphonotus H.A. Pilsbry & Johnson, 1911 † - (COLUMBELLIDAE) (FOSSIL)
- cyphopleura, Oxyloma cyphopleura Gardner & Campbell 2002a † - (SUCCINEIDAE) (FOSSIL)
- cyphosa, Clio convexa cyphosa J. Rampal, 2002 - (CLIIDAE)
- cyphostyla, Tornatellides cyphostyla (C.M.F. Ancey, 1904) - (ACHATINELLIDAE)
- Cyphoxis, syn of: Genus Arca C. Linnaeus, 1758 (ARCIDAE)
- cyphus, Plagiamites cyphus Buckman † - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- cyphus, Sassia cyphus R. Tate, 1888 † - (RANELLIDAE) (FOSSIL)
- Cyphus, syn of: Genus Kuphus J.É. Guettard, 1770 (TEREDINIDAE)
- cyphus, Plethobasus cyphus C.S. Rafinesque, 1820 - syn of: Plethobasus cyphyus (C.S. Rafinesque, 1820) - (UNIONIDAE)
- cyphyus, Plethobasus cyphyus (C.S. Rafinesque, 1820) - (UNIONIDAE)
- Cypraea, Genus Cypraea C. Linnaeus, 1758 (CYPRAEIDAE)
- Cypraeacassis, syn of: Genus Cypraecassis S. Stutchbury, 1837 (CASSIDAE)
- cypraeacea, Persicula cypraeacea J.B.G.M. Bory De Saint-Vincent, 1827 - syn of: Persicula cornea (J.B.P.A. Lamarck, 1822) - (CYSTISCIDAE)
- Cypraeacites, syn of: Genus Proadusta F. Sacco, 1894 † (CYPRAEIDAE) (FOSSIL)
- Cypraeactaeon, syn of: Genus Siphocypraea A. Heilprin, 1887 (CYPRAEIDAE)
- cypraeaeformis, Marginella cypraeaeformis S. Nardini, 1934 † - (MARGINELLIDAE) (FOSSIL)
- cypraeaformis, Hydroginella cypraeaformis F. Boyer, 2015 - (MARGINELLIDAE)
- Cypraearius, syn of: Genus Cypraea C. Linnaeus, 1758 (CYPRAEIDAE)
- Cypraecassis, Genus Cypraecassis S. Stutchbury, 1837 (CASSIDAE)
- Cypraedia, Genus Cypraedia Swainson, 1940 † (OVULIDAE) (FOSSIL)
- Cypraeerato, Subgenus Proterato (Cypraeerato) F.A. Schilder, 1932 (TRIVIIDAE)
- cypraeformis, Marginella cypraeformis J.E. Tenison-Woods, 1878 - syn of: Ovaginella ovulum (G.B. II Sowerby, 1846) - (MARGINELLIDAE)
- cypraeformis, Pugnellus cypraeformis A.A. Olsson, 1934 † - (PUGNELLIDAE) (FOSSIL)
- Cypraeicassis, syn of: Genus Cypraecassis S. Stutchbury, 1837 (CASSIDAE)
- CYPRAEIDAE Rafinesque, 1815 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-LITTORINIMORPHA [Order]-CYPRAEOIDEA [Superfamily])
- cypraeiformis, Cypraecassis cypraeiformis (S. Borson, 1820 †) - (CASSIDAE) (FOSSIL)
- Cypraeites, syn of: Genus Proadusta F. Sacco, 1894 † (CYPRAEIDAE) (FOSSIL)
- Cypraela, syn of: Genus Calpurnus P.D. Montfort, 1810 (OVULIDAE)
- Cypraella, syn of: Genus Calpurnus P.D. Montfort, 1810 (OVULIDAE)
- Cypraeobini, syn of: Genus Mandolina F.P. Jousseaume, 1884 † (CYPRAEIDAE) (FOSSIL)
- Cypraeogemmula, Genus Cypraeogemmula E.W. Vredenburg, 1920 † (PEDICULARIIDAE) (FOSSIL)
- cypraeoides, Pachybathron cypraeoides (C.B. Adams, 1845) - (CYSTISCIDAE)
- cypraeoides, Marginella cypraeoides J.E. Tenison-Woods, 1878 - syn of: Ovaginella ovulum (G.B. II Sowerby, 1846) - (MARGINELLIDAE)
- cypraeoides, Erato cypraeoides C.B. Adams, 1845 - syn of: Pachybathron cypraeoides (C.B. Adams, 1845) - (TRIVIIDAE)
- cypraeola, Marginella cypraeola G.B. II Sowerby - syn of: Hespererato scabriuscula (G.B. II Sowerby, 1832) - (MARGINELLIDAE)
- cypraeola, Erato cypraeola G.B. Brocchi, 1814 - syn of: Erato voluta (G. Montagu, 1803) - (TRIVIIDAE)
- Cypraeolina, Genus Cypraeolina Cerulli-Irelli, 1911 † (MARGINELLIDAE) (FOSSIL)
- Cypraeopsis, Genus Cypraeopsis Schilder, 1936 † (OVULIDAE) (FOSSIL)
- Cypraeorbis, Genus Cypraeorbis T.A. Conrad, 1865 (CYPRAEIDAE)
- Cypraeotrivia, syn of: Genus Jenneria F.P. Jousseaume, 1884 (PEDICULARIIDAE)
- Cypraeova, syn of: Genus Cypraeovula J.E. Gray, 1824 (CYPRAEIDAE)
- Cypraeovula, Genus Cypraeovula J.E. Gray, 1824 (CYPRAEIDAE)
- Cypraeovulini, syn of: Genus Pseudozonaria F.A. Schilder, 1927 (CYPRAEIDAE)
- Cypraeovulum, syn of: Genus Cypraeovula J.E. Gray, 1824 (CYPRAEIDAE)
- Cypraeovum, syn of: Genus Cypraeovula J.E. Gray, 1824 (CYPRAEIDAE)
- Cyprea, syn of: Genus Cypraea C. Linnaeus, 1758 (CYPRAEIDAE)
- Cyprecites, syn of: Genus Proadusta F. Sacco, 1894 † (CYPRAEIDAE) (FOSSIL)
- cypreophila, Helminthoglypta cypreophila (W.G. Binney & T.B. Bland, 1869) - (HELMINTHOGLYPTIDAE)
- Cypreovula, syn of: Genus Cypraeovula J.E. Gray, 1824 (CYPRAEIDAE)
- cypria, Albinaria alajana cypria H. Nordsieck, 1993 - (CLAUSILIIDAE)
- cypria, Calaxis cypria (W. Kobelt, 1896) - (FERUSSACIIDAE)
- cypria, Patella cypria J.F. Gmelin, 1791 - syn of: Patella ferruginea J.F. Gmelin, 1791 - (PATELLIDAE)
- cypria, Odostomia cypria W.H. Dall & P. Bartsch, 1912 - (PYRAMIDELLIDAE)
- cypria, Venus cypria W.J. Broderip & G.B. I Sowerby, 1835 - syn of: Lirophora mariae (A.V.M.D. D'Orbigny, 1846) - (VENERIDAE)
- Cypriarius, syn of: Genus Cypraea C. Linnaeus, 1758 (CYPRAEIDAE)
- Cypricardella, Genus Cypricardella Hall, 1856 † (CRASSATELLIDAE) (FOSSIL)
- Cypricardia, syn of: Genus Trapezium J.K. Megerle Von Mühlfeld, 1811 (TRAPEZIDAE)
- Cypricardinea, syn of: Genus Cypricardinia Hall, 1860 † (CYPRICARDINIIDAE) (FOSSIL)
- Cypricardinia, Genus Cypricardinia Hall, 1860 † (CYPRICARDINIIDAE) (FOSSIL)
- CYPRICARDINIIDAE Ulrich, 1894 † - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-MODIOMORPHIDA [Order]-MODIOMORPHOIDEA [Super) (FOSSIL)
- Cypricardites, Genus Cypricardites Isberg, 1934 † (KALENTERIDAE) (FOSSIL)
- Cypricia, syn of: Genus Anatina H.C.F. Schumacher, 1817 (MACTRIDAE)
- cypricus koutaisanus, Zonites cypricus koutaisanus A. Mousson, 1863 - syn of: Longiphallus koutaisanus (A. Mousson, 1863) - (ZONITIDAE)
- cypridium, Helcion cypridium G. Perry, 1811 - syn of: Patella pellucida C. Linnaeus, 1758 - (PATELLIDAE)
- Cyprimeria, Genus Cyprimeria T.A. Conrad, 1864 † (VENERIDAE) (FOSSIL)
- Cyprina, syn of: Genus Arctica H.C.F. Schumacher, 1817 (ARCTICIDAE)
- cyprina, Astartila cyprina J.B.M. Dana, 1847 † - syn of: Astartila intrepida J.B.M. Dana, 1847 † - (MEGADESMIDAE) (FOSSIL)
- cyprina, Vitrea cyprina C.A. Westerlund, 1902 - (PRISTILOMATIDAE)
- cyprina, Scissurella cyprina B.C. Cotton & F.C. Godfrey, 1938 - (SCISSURELLIDAE)
- Cyprinella, syn of: Genus Polymesoda C.S. Rafinesque, 1820 (CYRENIDAE)
- Cypriniadea, syn of: Genus Arctica H.C.F. Schumacher, 1817 (ARCTICIDAE)
- cyprinoides, Pygocardia cyprinoides (Sandberger 1861) † - (ARCTICIDAE) (FOSSIL)
- cyprinoides, Astarte cyprinoides A. Duval, 1841 - syn of: Astarte arctica (J.E. Gray, 1824) - (ASTARTIDAE)
- cyprinoides, Chtenopteryx cyprinoides L.M.A.O.E. Joubin, 1894 - syn of: Chtenopteryx sicula (J.B. Vérany, 1851) - (CHTENOPTERYGIDAE)
- cyprinoides, Villorita cyprinoides (J.E. Gray, 1825) - (CYRENIDAE)
- cyprinoides, Cyrena cyprinoides J.R.C. Quoy & J.P. Gaimard, 1834 - syn of: Geloina erosa (J. Lightfoot, 1786) - (CYRENIDAE)
- cyprinoides, Coralliophaga cyprinoides Wood, 1840 † - (TRAPEZIDAE) (FOSSIL)
- cyprinoides, Venus cyprinoides H.E. Anton, 1838 - syn of: Mercenaria mercenaria (C. Linnaeus, 1758) - (VENERIDAE)
- cyprinorum, Unio cyprinorum J. Berthier, 1882 - syn of: Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- cyprinus, Anatina cyprinus (W. Wood, 1828) - (MACTRIDAE)
- cyprinus, Anatina cyprinus W. Wood, 1828 - syn of: Anatina cyprinus (W. Wood, 1828) - (MACTRIDAE)
- cypriola, Helicopsis cypriola (C.A. Westerlund, 1889) - (HYGROMIIDAE)
- cypris, Modiolus cypris E. Forbes, 1846 † - (MYTILIDAE) (FOSSIL)
- cypris, Turris cypris (Orbigny, 1852 †) - (TURRIDAE) (FOSSIL)
- cyprium, Deroceras cyprium (H.R. Simroth, 1906) - (AGRIOLIMACIDAE)
- cyprium, Nemocardium cyprium (G.B. Brocchi, 1814 †) - (CARDIIDAE) (FOSSIL)
- cyprius, Paramastus cyprius A. Zilch, 1951 - (ENIDAE)
- cyprius, Milax cyprius (H.R. Simroth, 1906) - (MILACIDAE)
- cyprius, Oxychilus cyprius L. Pfeiffer, 1847 - (OXYCHILIDAE)
- cyprius, Pleurodiscus cyprius (W. Kobelt, 1896) - (PLEURODISCIDAE)
- Cyproea, syn of: Genus Cypraea C. Linnaeus, 1758 (CYPRAEIDAE)
- Cyprogenia, Genus Cyprogenia A.E.R. Agassiz, 1852 (UNIONIDAE)
- Cyproglobina, Genus Cyproglobina De Gregorio, 1880 (PEDICULARIIDAE) (FOSSIL)
- Cyproglobini, syn of: Genus Pseudocypraea F.A. Schilder, 1927 (PEDICULARIIDAE)
- Cyproglobino, Genus Cyproglobino A. De Gregorio, 1880 † (OVULIDAE) (FOSSIL)
- Cypropterina, Genus Cypropterina A. De Gregorio, 1880 (EOCYPRAEIDAE)
- Cyprovula, syn of: Genus Cypraeovula J.E. Gray, 1824 (CYPRAEIDAE)
- cypsele, Streptaxis cypsele (L. Pfeiffer, 1849) - (STREPTAXIDAE)
- cypselis, Divaricella cypselis J.C. Melvill, 1918 - syn of: Pillucina angela (J.C. Melvill, 1899) - (LUCINIDAE)
- cypsellus, Pteria cypsellus R.W. Dunker, 1872 - syn of: Pteria peasei (R.W. Dunker, 1872) - (PTERIIDAE)
- Cyptendoceras, Genus Cyptendoceras Ulrich & Foerste, 1936 † (BALTOCERATIDAE) (FOSSIL)
- cypticostatus, Aviculopecten cypticostatus C.C. Lu, 1986 † - (AVICULOPECTINIDAE) (FOSSIL)
- Cyrachaea, syn of: Genus Myrtea W.H. Turton, 1822 (LUCINIDAE)
- cyrano, Yochelcionella cyrano Runnegar & Pojeta Jr., 1974 † - (YOCHELCIONELLIDAE) (FOSSIL)
- Cyranus, Subgenus Modiolus (Cyranus) Sowerby, 1818 † (MYTILIDAE) (FOSSIL)
- Cyrbasia, Genus Cyrbasia G.F. Harris & H.W. Burrows, 1891 (CERITHIOPSIDAE)
- cyrea, Gabbiella cyrea Y.I. Starobogatov in Y.I. Starobogatov & F. Zatrawkin, 1987 - (BITHYNIIDAE)
- cyrea, Anodonta cyrea H. Drouët, 1881 - (UNIONIDAE)
- Cyrena, syn of: Genus Corbicula J.K. Megerle Von Mühlfeld, 1811 (CYRENIDAE)
- Cyrenaeus, Genus Cyrenaeus J. Heller, 1971 (ENIDAE)
- Cyrenastrum, syn of: Genus Sphaerium J.A. Scopoli, 1777 (SPHAERIIDAE)
- cyrene, Dendrotrochus cyrene (J.C.H. Crosse, 1865) - (HELICARIONIDAE)
- cyrene, Helix cyrene J.C.H. Crosse, 1865 - syn of: Dendrotrochus cyrene (J.C.H. Crosse, 1865) - (HELICIDAE)
- cyrene, Kurtzina cyrene (W.H. Dall, 1919) - (MANGELIIDAE)
- cyrene, Kurtziella cyrene (W.H. Dall, 1919) - syn of: Kurtzina cyrene (W.H. Dall, 1919) - (MANGELIIDAE)
- cyrene, Decoritheca cyrene (Walcott, 1905 †) - (NOVITATIDAE) (FOSSIL)
- Cyrenella, syn of: Genus Cyrenoida L. de Joannis, 1835 (CYRENOIDIDAE)
- Cyrenella, syn of: Genus Cyrenoida L. de Joannis, 1835 (CYRENOIDIDAE)
- CYRENIDAE Gray, 1847 - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-VENERIDA [Order]-CYRENOIDEA [Superfamily])
- cyreniformis, Corbicula cyreniformis T. Prime, 1860 - (CYRENIDAE)
- Cyrenobatissa, Subgenus Batissa (Cyrenobatissa) M. Suzuki & K. Oyama, 1943 (CYRENIDAE)
- Cyrenocapsa, syn of: Subgenus Polymesoda (Pseudocyrena) Bourguignat, 1854 (CYRENIDAE)
- Cyrenodonax, Subgenus Corbiculina (Cyrenodonax) W.H. Dall, 1903 (CYRENIDAE)
- Cyrenodonta, syn of: Genus Cyrenoida L. de Joannis, 1835 (CYRENOIDIDAE)
- Cyrenoida, Genus Cyrenoida L. de Joannis, 1835 (CYRENOIDIDAE)
- Cyrenoidea, syn of: Genus Cyrenoida L. de Joannis, 1835 (CYRENOIDIDAE)
- cyrenoidea, Strigilla cyrenoidea (S.C.T. Hanley, 1844) - (TELLINIDAE)
- cyrenoides, Rangia cyrenoides C. des Moulins, 1832 - syn of: Rangia cuneata Sowerby, 1831 - (MACTRIDAE)
- cyrenoides, Sinonucula cyrenoides (J.T. Kuroda, 1929) - (NUCULIDAE)
- cyrenoides, Pachynaias cyrenoides (R.A. Philippi, 1847) - (UNIONIDAE)
- CYRENOIDIDAE H. Adams & A. Adams, 1857 (1853) - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-VENERIDA [Order]-CYRENOIDOIDEA [Superfamily])
- cyrenophila, Valvata cyrenophila A. Andreae, 1884 † - (VALVATIDAE) (FOSSIL)
- Cyrenopsis, Genus Cyrenopsis Etheridge, 1902 † (NEOMIODONTIDAE) (FOSSIL)
- cyrenopsis, Grandidieria burtoni cyrenopsis J.R. Bourguignat, 1885 - (UNIONIDAE)
- Cyrenorita, Genus Cyrenorita Janssen, 1981 † (CYRENIDAE) (FOSSIL)
- cyri, Ziba cyri W.L.H. Dohrn, 1860 - syn of: Ziba fulgetrum (L.A. Reeve, 1844) - (MITRIDAE)
- cyrili, Callogonia cyrili R. von Cosel & C. Salas, 2001 - (VESICOMYIDAE)
- Cyrilla, syn of: Genus Huxleyia A. Adams, 1860 (NUCINELLIDAE)
- cyrilli, Murex cyrilli A. Scacchi, 1833 - syn of: Raphitoma linearis (G. Montagu, 1803) - (MURICIDAE)
- cyrilli, Raphitoma cyrilli Š. Brusina, 1866 - (RAPHITOMIDAE)
- cyrilli, Raphitoma cyrilli A. Scacchi, 1835 - syn of: Raphitoma leufroyi (A. Michaud, 1828) - (RAPHITOMIDAE)
- cyrilli, Venus cyrilli A. Scacchi, 1832 - syn of: Gouldia minima (G. Montagu, 1803) - (VENERIDAE)
- Cyrillista, syn of: Genus Huxleyia A. Adams, 1860 (NUCINELLIDAE)
- Cyrillista, syn of: Genus Huxleyia A. Adams, 1860 (NUCINELLIDAE)
- Cyrillona, syn of: Genus Nucinella S.V. Wood, 1851 (NUCINELLIDAE)
- cyrnaeus, Jujubinus cyrnaeus E. Réquien, 1848 - syn of: Jujubinus montagui (W. Wood, 1828) - (TROCHIDAE)
- cyrnaeus, Trochus cyrnaeus E. Réquien, 1848 - syn of: Jujubinus montagui (W. Wood, 1828) - (TROCHIDAE)
- cyrniaca, Tacheocampylaea cyrniaca (G. Dutailly, 1867) - (HELICIDAE)
- cyrniaca, Radix cyrniaca J.F. Mabille, 1869 - syn of: Radix labiata (E.A. Rossmässler, 1835) - (LYMNAEIDAE)
- cyrniaca faucicola, Tacheocampylaea cyrniaca faucicola (P. Hagenmüller, 1888) - (HELICIDAE)
- cyrniaca omphalophora, Tacheocampylaea cyrniaca omphalophora (G. Dutailly, 1867) - (HELICIDAE)
- cyrniacus, Pseudamnicola cyrniacus (J.F. Mabille, 1869) - (HYDROBIIDAE)
- Cyrnotheba, Subgenus Monacha (Cyrnotheba) J. Germain, 1929 (HYGROMIIDAE)
- cyrnusi, Ostrea cyrnusi B.C.M. Payraudeau, 1826 - syn of: Ostrea edulis C. Linnaeus, 1758 - (OSTREIDAE)
- cyrta, Merelina cyrta B.C. Cotton, 1944 - syn of: Alvania hedleyi K.H.J. Thiele, 1930 - (RISSOIDAE)
- cyrta, Lyropupa cyrta C.M. Cooke & H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- Cyrtactinoceras, Genus Cyrtactinoceras Hyatt in Zittel, 1900 † (PROTEOCERATIDAE) (FOSSIL)
- Cyrtendoceras, Genus Cyrtendoceras Remelé, 1886 † (CYRTENDOCERATIDAE) (FOSSIL)
- CYRTENDOCERATIDAE Hyatt, 1900 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-ENDOCERIDA [Order]) (FOSSIL)
- Cyrthoceratites, Genus Cyrthoceratites d'Archiac & de Verneuil, 1842 † (NOTHOCERATIDAE) (FOSSIL)
- Cyrtoactinoceras, syn of: Genus Cyrtactinoceras Hyatt in Zittel, 1900 † (PROTEOCERATIDAE) (FOSSIL)
- Cyrtobactrites, Genus Cyrtobactrites Erben, 1960 † (BACTRITIDAE) (FOSSIL)
- Cyrtobaltoceras, Genus Cyrtobaltoceras Flower, 1964 † (BALTOCERATIDAE) (FOSSIL)
- Cyrtobelus, Genus Cyrtobelus Fuchs & al., 2012 † (GROENLANDIBELIDAE) (FOSSIL)
- cyrtocelis, Theodoxus cyrtocelis (C.F.F. von Krauss, 1852 †) - (NERITIDAE) (FOSSIL)
- cyrtocelis austriacus, Theodoxus cyrtocelis austriacus (Rzehak, 1893 †) - (NERITIDAE) (FOSSIL)
- cyrtocelis obtusangulus, Theodoxus cyrtocelis obtusangulus (C.F.F. von Krauss, 1852 †) - (NERITIDAE) (FOSSIL)
- cyrtocelis sparsus, Theodoxus cyrtocelis sparsus (C.F.F. von Krauss, 1852 †) - (NERITIDAE) (FOSSIL)
- cyrtocera, Capulus cyrtocera Münster, 1841 † - (CAPULIDAE) (FOSSIL)
- Cyrtocera, syn of: Genus Cyrtoceras Clarke, 1897 † (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- Cyrtoceras, Genus Cyrtoceras Clarke, 1897 † (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- Cyrtoceratites, Genus Cyrtoceratites Hoeninghaus, 1830 † (ARCHIACOCERATIDAE) (FOSSIL)
- Cyrtocerina, Genus Cyrtocerina Billings, 1865 † (CYRTOCERINIDAE) (FOSSIL)
- CYRTOCERINIDAE Flower, 1946 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-ELLESMEROCERIDA [Order]) (FOSSIL)
- Cyrtocheilus, Genus Cyrtocheilus Shimanskiy, 1962 † (POLYELASMOCERATIDAE) (FOSSIL)
- Cyrtochetus, Genus Cyrtochetus A.E.M. Cossmann, 1901 † (BUCCINIDAE) (FOSSIL)
- cyrtochila, Tengchiena cyrtochila (G.P.L.K. Gude, 1905) - (EUCONULIDAE)
- cyrtochila, Stenothyra cyrtochila W.S.S. Van Benthem-Jutting, 1959 - (STENOTHYRIDAE)
- Cyrtochilus, syn of: Genus Sciponoceras Hyatt , 1894 † (BACULITIDAE) (FOSSIL)
- cyrtochilus, Diplommatina cyrtochilus J.F. Quadras & O.F. von Möllendorff, 1895 - (DIPLOMMATINIDAE)
- cyrtochilus, Gudeodiscus cyrtochilus (G.P.L.K. Gude, 1909) - (PLECTOPYLIDAE)
- Cyrtoclymenia, Genus Cyrtoclymenia Hyatt , 1884 † (CYRTOCLYMENIIDAE) (FOSSIL)
- CYRTOCLYMENIIDAE Hyatt, 1884 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CLYMENIIDA [Order]-CYRTOCLYMENIOIDEA [Superfamily]) (FOSSIL)
- cyrtoconoidea, Eulimella cyrtoconoidea A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- cyrtoconoidea, Turbonilla cyrtoconoidea A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- Cyrtocycloceras, Genus Cyrtocycloceras Foerste, 1936 (PARAPHRAGMITIDAE) (FOSSIL)
- Cyrtocythara, syn of: Genus Mangelia A. Risso, 1826 (MANGELIIDAE)
- Cyrtodaria, Genus Cyrtodaria A.E. Reuss, 1801 (HIATELLIDAE)
- Cyrtodera, syn of: Genus Cyrtodaria A.E. Reuss, 1801 (HIATELLIDAE)
- Cyrtodiscus, Genus Cyrtodiscus Perner, 1903 † (SINUITIDAE) (FOSSIL)
- Cyrtodonta, Genus Cyrtodonta Billings, 1858 † (CYRTODONTIDAE) (FOSSIL)
- Cyrtodontarca, Genus Cyrtodontarca Yakovlev, 1903 (PTERINEIDAE) (FOSSIL)
- CYRTODONTIDAE Ulrich, 1894 † - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-CYRTODONTIDA [Order]-CYRTODONTOIDEA [Superfamily]) (FOSSIL)
- Cyrtodontidina, Genus Cyrtodontidina Scarlato & Starobogatov, 1971 † (MYTILIDAE) (FOSSIL)
- Cyrtodontopsis, Subgenus Gosseletia (Cyrtodontopsis) Frech, 1891 † (AMBONYCHIIDAE) (FOSSIL)
- Cyrtodontula, Genus Cyrtodontula Tomlin, 1931 † (CYRTODONTIDAE) (FOSSIL)
- cyrtoglypha, Bucania cyrtoglypha Bergeron, 1889 † - syn of: Peelerophon oehlerti (Bergeron, 1889 †) - (BUCANIIDAE) (FOSSIL)
- cyrtoglypha, Peelerophon cyrtoglypha Harrington, 1938 † - syn of: Peelerophon oehlerti (Bergeron, 1889 †) - (TROPIDODISCIDAE) (FOSSIL)
- cyrtoglyphe, Acmella cyrtoglyphe J.J. Vermeulen, T.S. Liew & M. Schilthuizen, 2015 - (ASSIMINEIDAE)
- Cyrtogomphoceras, Genus Cyrtogomphoceras Foerste, 1924 † (CYRTOGOMPHOCERATIDAE) (FOSSIL)
- CYRTOGOMPHOCERATIDAE Flower , 1940 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-DISCOSORIDA [Order]) (FOSSIL)
- Cyrtogomphus, Genus Cyrtogomphus Flower, 1938 † (POTERIOCERATIDAE) (FOSSIL)
- cyrtoidea, Turbona cyrtoidea F. Nordsieck, 1972 - syn of: Alvania beanii (S.C.T. Hanley in C. Thorpe, 1844) - (RISSOIDAE)
- Cyrtoides, syn of: Genus Raphitoma L.M.D. Bellardi, 1847 (RAPHITOMIDAE)
- Cyrtokolymia, Genus Cyrtokolymia Astaf'yeva, 1988 † (KOLYMIIDAE) (FOSSIL)
- cyrtoliformis, Igorella cyrtoliformis Yü, 1979 † - (HELCIONELLIDAE) (FOSSIL)
- Cyrtolites, Genus Cyrtolites Conrad , 1838 † (CYRTOLITIDAE) (FOSSIL)
- cyrtolites, Vorticina cyrtolites (J.W. Hall, 1858 †) - (TROPIDODISCIDAE) (FOSSIL)
- Cyrtolithes, syn of: Genus Cyrtolites Conrad , 1838 † (CYRTOLITIDAE) (FOSSIL)
- CYRTOLITIDAE Miller, 1889 † - Family (MONOPLACOPHORA-CYRTONELLIDA [Order]) (FOSSIL)
- Cyrtolitina, Genus Cyrtolitina Ulrich & Scofield, 1897 † (TROPIDODISCIDAE) (FOSSIL)
- cyrtomaphorus, Viviparus cyrtomaphorus Š. Brusina, 1874 † - (VIVIPARIDAE) (FOSSIL)
- Cyrtonaias, Genus Cyrtonaias J.C.H. Crosse & P. Fischer, 1894 (UNIONIDAE)
- Cyrtonella, Subgenus Cyrtolites (Cyrtonella) Hall, 1859 † (CYRTOLITIDAE) (FOSSIL)
- CYRTONELLIDA (UNASSIGNED) - Family (MONOPLACOPHORA-CYRTONELLIDA [Order]) (FOSSIL)
- CYRTONELLIDAE Knight & Yochelson, 1958 † - Family (MONOPLACOPHORA-CYRTONELLIDA [Order]-CYRTONELLOIDEA [Superfamily]) (FOSSIL)
- Cyrtonellopsis, Genus Cyrtonellopsis Yochelson , 1958 † (CYRTOLITIDAE) (FOSSIL)
- Cyrtonowakia, Genus Cyrtonowakia Alberti, 1986 † (PROCORNICULINIDAE) (FOSSIL)
- Cyrtonybyoceras, Genus Cyrtonybyoceras Teichert, 1933 † (ARMENOCERATIDAE) (FOSSIL)
- cyrtopatronus, Spyroceras cyrtopatronus Kröger, 2008 † - (SPYROCERATIDAE) (FOSSIL)
- Cyrtopinna, Subgenus Pinna (Cyrtopinna) O.A.L. Mörch, 1853 (PINNIDAE)
- cyrtopleura, Pleuroxia cyrtopleura (L. Pfeiffer, 1862) - (CAMAENIDAE)
- cyrtopleura, Helix cyrtopleura L. Pfeiffer, 1862 - syn of: Pleuroxia cyrtopleura (L. Pfeiffer, 1862) - (HELICIDAE)
- Cyrtopleura, Genus Cyrtopleura G.W. Tryon, 1862 (PHOLADIDAE)
- Cyrtopleurites, Genus Cyrtopleurites Mojsisovics , 1893 † (TIBETITIDAE) (FOSSIL)
- cyrtopleuron, Opisthostoma cyrtopleuron J.J. Vermeulen, 1994 - (DIPLOMMATINIDAE)
- Cyrtopleuropsis, Genus Cyrtopleuropsis Pacaud, 1998 † (PHOLADIDAE) (FOSSIL)
- Cyrtorhabdoceras, Subgenus Rhabdoceras (Cyrtorhabdoceras) Mojsisovics, 1893 † (RHABDOCERATIDAE) (FOSSIL)
- cyrtorhitis, Diplommatina cyrtorhitis J.J. Vermeulen, 1993 - (DIPLOMMATINIDAE)
- Cyrtorizoceras, Genus Cyrtorizoceras Hyatt, 1900 † (ONCOCERATIDAE) (FOSSIL)
- Cyrtorostra, Genus Cyrtorostra Branson, 1930 † (DELTOPECTINIDAE) (FOSSIL)
- Cyrtosiceras, Genus Cyrtosiceras Hyatt , 1900 † (OPPELIIDAE) (FOSSIL)
- Cyrtosolen, syn of: Genus Solecurtus H.M.D. De Blainville, 1824 (SOLECURTIDAE)
- Cyrtospira, Genus Cyrtospira Ulrich & Scofield, 1897 † (SUBULITIDAE) (FOSSIL)
- Cyrtospyroceras, Genus Cyrtospyroceras Flower, 1938 † (SPYROCERATIDAE) (FOSSIL)
- cyrtostriata, Cymaclymenia cyrtostriata (Kullmann, 1960 †) - (CYMACLYMENIIDAE) (FOSSIL)
- cyrtostriata, Falciclymenia cyrtostriata Kullmann, 1960 † - syn of: Cymaclymenia cyrtostriata (Kullmann, 1960 †) - (RECTOCLYMENIIDAE) (FOSSIL)
- Cyrtostropha, Genus Cyrtostropha Donald, 1902 † (MURCHISONIIDAE) (FOSSIL)
- Cyrtostrophia, syn of: Genus Cyrtostropha Donald, 1902 † (MURCHISONIIDAE) (FOSSIL)
- Cyrtothoracoceras, Genus Cyrtothoracoceras Turner, 1964 † (SPYROCERATIDAE) (FOSSIL)
- Cyrtotoma, syn of: Genus Aperostoma F.H. Troschel, 1847 (NEOCYCLOTIDAE)
- Cyrtoturbonilla, syn of: Genus Turbonilla A. Risso, 1826 (PYRAMIDELLIDAE)
- Cyrtovaginoceras, Genus Cyrtovaginoceras Kobayashi, 1934 † (CYRTENDOCERATIDAE) (FOSSIL)
- Cyrtronais, syn of: Genus Cyrtonaias J.C.H. Crosse & P. Fischer, 1894 (UNIONIDAE)
- Cyrtulotibia, Genus Cyrtulotibia Eames, 1957 † (ROSTELLARIIDAE) (FOSSIL)
- Cyrtulus, Genus Cyrtulus R.B. Hinds, 1843 ? (FASCIOLARIIDAE)
- cyrtus, Unio cyrtus É.A.A. Locard, 1899 - syn of: Unio abrantesianus É.A.A. Locard, 1899 - (UNIONIDAE)
- cysis, Ariophanta cysis (W.H. Benson) - (ARIOPHANTIDAE)
- Cystia, syn of: Genus Limatula S.V. Wood, 1839 (LIMIDAE)
- cysticola, Sabinella cysticola (F. Koehler & C. Vaney, 1925) - (EULIMIDAE)
- Cysticopsis, Subgenus Cepolis (Cysticopsis) O.A.L. Mörch, 1852 (CEPOLIDAE)
- Cysticus, syn of: Genus Cystiscus W. Stimpson, 1865 (CYSTISCIDAE)
- Cystigenus, syn of: Genus Limatula S.V. Wood, 1839 (LIMIDAE)
- CYSTISCIDAE Stimpson, 1865 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-NEOGASTROPODA [Order]-MURICOIDEA [Superfamily])
- Cystiscus, Genus Cystiscus W. Stimpson, 1865 (CYSTISCIDAE)
- cystiscus, Cystiscus cystiscus (J.H. Redfield, 1870) - (CYSTISCIDAE)
- cystiscus, Marginella cystiscus J.H. Redfield, 1870 - syn of: Cystiscus cystiscus (J.H. Redfield, 1870) - (MARGINELLIDAE)
- Cystopelta, Genus Cystopelta R. Tate, 1881 (CYSTOPELTIDAE)
- CYSTOPELTIDAE Tate, 1891 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-PUNCTOIDEA [Superfamily])
- cystophora, Rissoella cystophora (H.J. Finlay, 1924) - (RISSOELLIDAE)
- cytaeum, Anomia cytaeum J.E. Gray, 1850 - (ANOMIIDAE)
- Cythara, Genus Cythara H.C.F. Schumacher, 1817 (MANGELIIDAE)
- cythara, Microvoluta cythara P. Bouchet & Y.I. Kantor, 2004 - (VOLUTOMITRIDAE)
- Cytharella, syn of: Genus Mangelia A. Risso, 1826 (MANGELIIDAE)
- Cytharoclavus, Genus Cytharoclavus J.T. Kuroda & K. Oyama, 1971 (HORAICLAVIDAE)
- Cytharomorula, Genus Cytharomorula J.T. Kuroda, 1953 (MURICIDAE)
- Cytharopsis, Genus Cytharopsis A. Adams, 1865 (MANGELIIDAE)
- cytherae, Pileopsis cytherae R.P. Lesson, 1831 - syn of: Phenacolepas cytherae (R.P. Lesson, 1831) - (CAPULIDAE)
- cytherae, Albinaria cytherae (O. Böttger, 1894) - (CLAUSILIIDAE)
- cytherae, Phenacolepas cytherae (R.P. Lesson, 1831) - (PHENACOLEPADIDAE)
- cytherae cerigottana, Albinaria cytherae cerigottana (O. Böttger, 1894) - (CLAUSILIIDAE)
- Cytheraea, syn of: Genus Meretrix J.B.P.A. Lamarck, 1799 (VENERIDAE)
- cytherea, Pleurorima cytherea (J. Perner, 1903 †) - (GOSSELETINIDAE) (FOSSIL)
- cytherea, Malletia cytherea W.H. Dall, 1886 - syn of: Tindaria cytherea (W.H. Dall, 1881) - (MALLETIIDAE)
- cytherea, Astartila cytherea J.B.M. Dana, 1847 † - syn of: Astartila intrepida J.B.M. Dana, 1847 † - (MEGADESMIDAE) (FOSSIL)
- cytherea, Nucula cytherea W.H. Dall, 1881 - syn of: Tindaria cytherea (W.H. Dall, 1881) - (NUCULIDAE)
- cytherea, Partula cytherea C.M. Cooke & D.M. Crampton, 1930 - (PARTULIDAE)
- cytherea, Chlamys cytherea A.R.J.B. Bavay, 1904 - (PECTINIDAE)
- cytherea, Pleurotomaria cytherea J. Perner, 1903 † - syn of: Pleurorima cytherea (J. Perner, 1903 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- cytherea, Tindaria cytherea (W.H. Dall, 1881) - (TINDARIIDAE)
- cytherea, Unio cytherea H.C. Küster, 1833 - syn of: Unio crassus L. Philipsson in A. Retzius, 1788 - (UNIONIDAE)
- Cytherea, syn of: Genus Periglypta A.J. Jukes-Browne, 1914 (VENERIDAE)
- cythereaeformis, Venus cythereaeformis G.P. Deshayes, 1857 † - (VENERIDAE) (FOSSIL)
- Cythereites, syn of: Genus Meretrix J.B.P.A. Lamarck, 1799 (VENERIDAE)
- Cytheriopsis, Genus Cytheriopsis Conrad , 1865 † (VENERIDAE) (FOSSIL)
- Cytherocardia, Genus Cytherocardia Sacco, 1900 † (GLOSSIDAE) (FOSSIL)
- Cytherodon, Genus Cytherodon Hall & Whitfield, 1872 † (TRIGONIIDA (UNASSIGNED)) (FOSSIL)
- Cythnia, Genus Cythnia P.P. Carpenter, 1864 (EULIMIDAE)
- Cythnoa, syn of: Genus Cythnia P.P. Carpenter, 1864 (EULIMIDAE)
- Cytora, Genus Cytora W. Kobelt & O.F. von Möllendorff, 1897 (LIAREIDAE)
- cytora, Cytora cytora (J.E. Gray, 1850) - (LIAREIDAE)
- cyzicensis, Cernuella cyzicensis J. Galland in G. Coutagne, 1881 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- Czabalaya, Genus Czabalaya Bandel & Riedel, 1994 (VIVIPARIDAE) (FOSSIL)
- czarnieckii, Heidelbergeria czarnieckii Krawczynski, 2006 † - (ELASMONEMATIDAE) (FOSSIL)
- Czarnoclymenia, Genus Czarnoclymenia Korn , 1999 † (PLATYCLYMENIIDAE) (FOSSIL)
- czarnohorica, Fruticicola czarnohorica W. Polinski, 1924 - syn of: Perforatella rubiginosa (A. Schmidt, 1853) - (BRADYBAENIDAE)
- czekanowskii, Maizuria czekanowskii Kurushin, 1980 † - (BAKEVELLIIDAE) (FOSSIL)
- czekanowskii, Bucania czekanowskii A. Schmidt, 1858 † - (BUCANIIDAE) (FOSSIL)
- czekanowskii, Helix czekanowskii C.A. Westerlund, 1897 - syn of: Stygius stuxbergi (C.A. Westerlund, 1876) - (HELICIDAE)
- czekanowskii, Prosphingites czekanowskii Mojsisovics, 1886 † - (MELAGATHICERATIDAE) (FOSSIL)
- czekanowskii, Oxytoma czekanowskii Teller, 1886 † - (OXYTOMIDAE) (FOSSIL)
- Czekanowskites, Genus Czekanowskites Diener , 1915 † (LONGOBARDITIDAE) (FOSSIL)
- czerskii, Parajuga czerskii (I.M. Moskvicheva in F. Zatrawkin, 1986) - (SEMISULCOSPIRIDAE)
- czerskii, Galileja czerskii Y.I. Starobogatov & E.A. Streletzkaja, 1967 - syn of: Pisidium henslowanum (R. Sheppard, 1825) - (SPHAERIIDAE)
- czoernigi, Arcestes czoernigi Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
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