- casa, Chione casa H.F.A. von Ihering, 1907 † - (VENERIDAE) (FOSSIL)
- casablancae, Cerion casablancae P. Bartsch, 1920 - (CERIONIDAE)
- casacantaurana, Axelella casacantaurana B.M. Landau & al., 2012 † - (CANCELLARIIDAE) (FOSSIL)
- casaeblancae, Unio casaeblancae R.A. Philippi, 1848 - syn of: Diplodon chilensis (J.E. Gray, 1852) - (UNIONIDAE)
- casali, Semele casali M. Doello-Jurado, 1949 - (SEMELIDAE)
- casamajorensis, Juliania aequistriata casamajorensis Morra & Del Rio, 1987 † - (ARCHITECTONICIDAE) (FOSSIL)
- casandra, Doto casandra J.A. Ortea, 2013 - (DOTIDAE)
- casani, Thracia casani A. Aradas & P. Calcara, 1843 - syn of: Thracia distorta (G. Montagu, 1803) - (THRACIIDAE)
- casanica, Cocculina casanica W.H. Dall, 1919 - (COCCULINIDAE)
- casanovae, Hemihoplites casanovae Delanoy, 1992 † - (HEMIHOPLITIDAE) (FOSSIL)
- casanovei, Anomia casanovei G.P. Deshayes, 1858 † - (ANOMIIDAE) (FOSSIL)
- casaretii, Aeolidia casaretii J.B. Vérany, 1846 - syn of: Aeolidia casaretti J.B. Vérany, 1846 - (AEOLIDIIDAE)
- casaretti, Aeolidia casaretti J.B. Vérany, 1846 - (AEOLIDIIDAE)
- casaretto, Viviparus casaretto (C. Rousseau, 1842 †) - (VIVIPARIDAE) (FOSSIL)
- casasensis, Nesocoptis pruinosa casasensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- cascabulloi, Costoanachis cascabulloi J. Espinosa & J.A. Ortea, 2004 - (COLUMBELLIDAE)
- cascabullorum, Erosaria spurca cascabullorum F.F. Talavera, Dionis & R. Gomez, 1986 - (CYPRAEIDAE)
- cascadensis, Kimboraga cascadensis F. Köhler, 2010 - (CAMAENIDAE)
- cascadiensis, Leptochiton cascadiensis Sigwart & C. Chen, 2017 - (LEPTOCHITONIDAE)
- cascadiensis, Axinus cascadiensis P.G. Oliver & A.M. Holmes, 2007 - (THYASIRIDAE)
- casciana, Alia casciana W.H. Dall, 1919 - syn of: Alia gausapata (A.A. Gould, 1850) - (COLUMBELLIDAE)
- cascoensis, Yoldia cascoensis J.W. Mighels & C.B. Adams, 1842 - syn of: Yoldia myalis (J.P.Y. Couthouy, 1838) - (YOLDIIDAE)
- casearia, Lucerapex casearia (C. Hedley & W.F. Petterd, 1906) - (TURRIDAE)
- casearia regilla, Lucerapex casearia regilla T. Iredale, 1936 - (TURRIDAE)
- casei, Opisthoptera casei (F.B. Meek & A.H. Worthen, 1866 †) - (AMBONYCHIIDAE) (FOSSIL)
- casei, Australoneilo casei Zinsmeister & Macellari, 1988 † - (MALLETIIDAE) (FOSSIL)
- Casella, syn of: Genus Glossodoris C.G. Ehrenberg, 1831 (CHROMODORIDIDAE)
- casentina, Oenopota casentina (W.H. Dall, 1919) - (MANGELIIDAE)
- casentina, Lora casentina W.H. Dall, 1919 - syn of: Oenopota casentina (W.H. Dall, 1919) - (TURRIDAE)
- Caseoceras, Genus Caseoceras Ulrich & al., 1943 † (ELLESMEROCERATIDAE) (FOSSIL)
- Caseolus, Subgenus Ochtephila (Caseolus) R.T. Lowe, 1852 (HYGROMIIDAE)
- casertana, Helix casertana M. Paulucci, 1880 - syn of: Campylaea planospira setulosa (Briganti, 1825) - (HELICIDAE)
- casertanum, Cardium casertanum G.S. Poli, 1791 - syn of: Pisidium casertanum (Poli, 1791) - (CARDIIDAE)
- casertanum, Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- casertanum, Pisidium casertanum T.N. Annandale, 1918 - syn of: Pisidium clarkeanum G. Nevill, 1871 - (SPHAERIIDAE)
- casertanum humeriforme, Pisidium casertanum humeriforme A. Stelfox, 1918 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- casertanum ponderosum, Pisidium casertanum ponderosum A. Stelfox, 1918 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- casertanus, Tandonia casertanus M. Lessona & C. Pollonera, 1882 - syn of: Tandonia sowerbyi (A.E.J. Férussac, 1823) - (MILACIDAE)
- Casertiana, syn of: Genus Pisidium L. Pfeiffer, 1821 (SPHAERIIDAE)
- Caseyella, Genus Caseyella MacNeil, 1984 † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Caseyhoplites, Genus Caseyhoplites Cooper & Owen, 2013 † (HOPLITIDAE) (FOSSIL)
- caseyi, Tonohamites caseyi Klinger & J. Kennedy, 1977 † - (ANCYLOCERATIDAE) (FOSSIL)
- caseyi, Tropaeum caseyi M. Collignon, 1962 † - (ANCYLOCERATIDAE) (FOSSIL)
- caseyi, Architectonica textilina caseyi McNeil, 1984 † - (ARCHITECTONICIDAE) (FOSSIL)
- caseyi, Tropisurcula caseyi (T.H. Aldrich, 1903 † †) - (CLAVATULIDAE) (FOSSIL)
- caseyi, Euchasma caseyi Pojeta & al., 1977 † - (EOPTERIIDAE) (FOSSIL)
- caseyi, Strombiformis caseyi McNeil, 1984 † - (EULIMIDAE) (FOSSIL)
- caseyi, Holcodiscus caseyi Manolov, 1962 † - (HOLCODISCIDAE) (FOSSIL)
- caseyi, Natica caseyi McNeil, 1984 † - (NATICIDAE) (FOSSIL)
- caseyi, Turritella caseyi McNeil, 1984 † - (TURRITELLIDAE) (FOSSIL)
- casha, Catriona casha T.M. Gosliner & R.J. Griffiths, 1981 - (TRINCHESIIDAE)
- cashelense, Subclymenia cashelense Ramsbottom & Moore, 1961 † - (TRIGONOCERATIDAE) (FOSSIL)
- cashi, Ductoconus cashi J.R. Hendricks, 2015 † - (CONIDAE) (FOSSIL)
- cashmiriensis, Corbicula cashmiriensis G.P. Deshayes, 1854 - (CYRENIDAE)
- casia, Albinaria brevicollis casia (O. Böttger, 1883) - (CLAUSILIIDAE)
- casiacum, Bacillum casiacum (L.A. Reeve) - (SUBULINIDAE)
- casicalva, Pyruclia casicalva E.S. Marks, 1949 † - (CANCELLARIIDAE) (FOSSIL)
- casiguaya, Volvarina casiguaya J. Espinosa, J.A. Ortea & Y.L. Diez, 2015 - (MARGINELLIDAE)
- casii, Pleurotomaria casii F.B. Meek & A.H. Worthen, 1868 † - (PLEUROTOMARIIDAE) (FOSSIL)
- Casimiria, Genus Casimiria Cossmann, 1899 † (TRYPANAXIDAE) (FOSSIL)
- casina, Venus casina C. Linnaeus, 1758 - (VENERIDAE)
- casina albina, Venus casina albina P. Dautzenberg & H. Fischer, 1906 - syn of: Venus casina C. Linnaeus, 1758 - (VENERIDAE)
- casina aradasii, Venus casina aradasii M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1889 - (VENERIDAE)
- casina corsicanus, Venus casina corsicanus A. Aradas & L. Benoit, 1870 - (VENERIDAE)
- casina globosa, Venus casina globosa L. Benoit & A. Aradas, 1878 - syn of: Venus casina C. Linnaeus, 1758 - (VENERIDAE)
- casina picta, Venus casina picta M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1893 - syn of: Venus casina C. Linnaeus, 1758 - (VENERIDAE)
- casina sicilianus, Venus casina sicilianus A. Aradas & L. Benoit, 1870 - (VENERIDAE)
- casinaeformis, Venus casinaeformis M. Yokoyama, 1926 - syn of: Venus cassinaeformis (M. Yokoyama, 1926) - (VENERIDAE)
- casinensis, Saccoia doderleini casinensis (D. Pantanelli, 1886 †) - (HYDROBIIDAE) (FOSSIL)
- casinoides, Chione casinoides (B. de Basterot, 1825 †) - (VENERIDAE) (FOSSIL)
- casinula, Venus casinula G.P. Deshayes in J.B.G.M. Bory De Saint-Vincent, 1833 - syn of: Venus casina C. Linnaeus, 1758 - (VENERIDAE)
- casinus, Circomphalus casinus C. Linnaeus, 1758 - syn of: Venus casina C. Linnaeus, 1758 - (VENERIDAE)
- Casiohydrobia, Genus Casiohydrobia Y.I. Starobogatov, 1978 (HYDROBIIDAE)
- casitensis, Maderia casitensis Imlay, 1940 † - (OLCOSTEPHANIDAE) (FOSSIL)
- casius, Zonites casius E.C. Von Martens, 1889 - (ZONITIDAE)
- casmaliense, Bittium casmaliense P. Bartsch, 1911 - (CERITHIIDAE)
- Casmaria, Genus Casmaria H. Adams & A. Adams, 1853 (CASSIDAE)
- Casmeria, syn of: Genus Casmaria H. Adams & A. Adams, 1853 (CASSIDAE)
- caspari, Euhadra caspari (O.F. von Möllendorff, 1884) - (BRADYBAENIDAE)
- caspari, Nesiohelix caspari O.F. von Möllendorff, 1884 - syn of: Euhadra caspari (O.F. von Möllendorff, 1884) - (BRADYBAENIDAE)
- casperi, Collignoniceras casperi Anderson, 1958 † - (COLLIGNONICERATIDAE) (FOSSIL)
- caspia, Caspimactra caspia (Eichwald 1841) † - (CARDIIDA (UNASSIGNED)) (FOSSIL)
- caspia, Monodacna caspia (K.E.I. von Eichwald, 1829) - (CARDIIDAE)
- caspia, Corbula caspia K.E.I. von Eichwald, 1829 - syn of: Monodacna caspia (K.E.I. von Eichwald, 1829) - (CORBULIDAE)
- caspia, Dreissena caspia K.E.I. von Eichwald, 1855 - (DREISSENIDAE)
- Caspia, Genus Caspia W. Dybowski, 1888 (HYDROBIIDAE)
- caspia, Turricaspia caspia (K.E.I. von Eichwald, 1838) - (HYDROBIIDAE)
- caspia, Lauria caspia L. Pfeiffer, 1871 - syn of: Lauria cylindracea (E.M. Da Costa, 1778) - (LAURIIDAE)
- caspia, Mactra caspia K.E.I. von Eichwald † - (MACTRIDAE) (FOSSIL)
- caspia, Amphidesma caspia I. Krynicki, 1837 - syn of: Adacna vitrea (K.E.I. von Eichwald, 1829) - (SEMELIDAE)
- caspia, Anodonta caspia J.R. Bourguignat, 1882 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- caspia filatovae, Monodacna caspia filatovae B.M. Logvinenko & Y.I. Starobogatov, 1967 - syn of: Monodacna filatovae (B.M. Logvinenko & Y.I. Starobogatov, 1967) - (CARDIIDAE)
- caspia grossui, Hypanis caspia grossui O.A. Scarlato & Y.I. Starobogatov, 1972 - syn of: Monodacna caspia (K.E.I. von Eichwald, 1829) - (CARDIIDAE)
- caspia inflata, Micromelania caspia inflata W. Dybowski & J.G. Grochmalicki, 1915 - syn of: Turricaspia meneghiniana (A. Issel, 1865) - (HYDROBIIDAE)
- caspia knipowitschi, Monodacna caspia knipowitschi B.M. Logvinenko & Y.I. Starobogatov, 1966 - syn of: Monodacna knipowitschi (B.M. Logvinenko & Y.I. Starobogatov, 1966) - (CARDIIDAE)
- caspia pulla, Turricaspia caspia pulla W. Dybowski & J.G. Grochmalicki, 1915 - syn of: Pyrgula pulla (W. Dybowski & J.G. Grochmalicki, 1915) - (HYDROBIIDAE)
- caspia pullula, Turricaspia caspia pullula W. Dybowski & J.G. Grochmalicki, 1915 - syn of: Turricaspia pullula (W. Dybowski & J.G. Grochmalicki, 1915) - (HYDROBIIDAE)
- caspia typica, Micromelania caspia typica W. Dybowski & J.G. Grochmalicki, 1915 - syn of: Turricaspia caspia (K.E.I. von Eichwald, 1838) - (HYDROBIIDAE)
- Caspianites, Genus Caspianites T.L. Casey 1961 † (ANCYLOCERATIDAE) (FOSSIL)
- caspica, Allocinma caspica (C.A. Westerlund, 1902) - (BITHYNIIDAE)
- caspica, Hypanis caspica K.E.I. von Eichwald, 1829 - syn of: Monodacna caspia (K.E.I. von Eichwald, 1829) - (CARDIIDAE)
- Caspiconcha, Genus Caspiconcha Kelly, 2001 † (MODIOMORPHIDAE) (FOSSIL)
- Caspicyclotus, Genus Caspicyclotus L. Forcart, 1935 (CYCLOPHORIDAE)
- Caspiella, Genus Caspiella K.H.J. Thiele, 1928 (HYDROBIIDAE)
- Caspilimax, Subgenus Limax (Caspilimax) P. Hesse, 1926 (LIMACIDAE)
- Caspimactra, Genus Caspimactra Ali-Zade & Kabakova, 1969 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- Caspiohydrobia, Genus Caspiohydrobia Y.I. Starobogatov, 1970 (HYDROBIIDAE)
- Caspiophaedusa, Genus Caspiophaedusa W.A. Lindholm, 1924 (CLAUSILIIDAE)
- caspium, Cardium caspium O.A. Grimm, 1876 - syn of: Monodacna filatovae (B.M. Logvinenko & Y.I. Starobogatov, 1967) - (CARDIIDAE)
- caspius, Agriolimax caspius H.R. Simroth, 1901 - syn of: Deroceras caucasicum (H.R. Simroth, 1901) - (AGRIOLIMACIDAE)
- caspius, Lithoglyphus caspius S. Clessin & W. Dybowski in W. Dybowski, 1888 - syn of: Pseudamnicola sphaerion (A. Mousson, 1863) - (LITHOGLYPHIDAE)
- caspius, Lithoglyphus caspius O.A. Grimm, 1876 - syn of: Pseudamnicola brusiniana (S. Clessin & W. Dybowski in W. Dybowski, 1888) - (LITHOGLYPHIDAE)
- caspius, Ortizius caspius (O. Böttger, 1880) - (OXYCHILIDAE)
- caspius, Cyclostoma caspius A. Mousson, 1876 - syn of: Pomatias hyrcanum (E.C. Von Martens, 1874) - (POMATIIDAE)
- caspius disciformis, Oxychilus caspius disciformis F. Riedel, 1959 - syn of: Ortizius disciformis (F. Riedel, 1959) - (OXYCHILIDAE)
- casquesense, Pedioceras casquesense D.L.G. Karsten, 1858 † - syn of: Pedioceras caquesense (D.L.G. Karsten, 1858 †) - (ANCYLOCERATIDAE) (FOSSIL)
- cassa, Diplommatina uzenensis cassa H.A. Pilsbry, 1901 - (DIPLOMMATINIDAE)
- cassandra, Cupedora cassandra (L. Pfeiffer, 1864) - (CAMAENIDAE)
- cassandra, Allodiscus cassandra (F.W. Hutton, 1883) - (CHAROPIDAE)
- cassandra, Aesopus cassandra (C. Hedley, 1904) - (COLUMBELLIDAE)
- cassandra, Helix cassandra L. Pfeiffer, 1864 - syn of: Cupedora cassandra (L. Pfeiffer, 1864) - (HELICIDAE)
- cassandra, Plethospira cassandra (Billings 1865 †) - (MURCHISONIIDAE) (FOSSIL)
- cassandra, Odostomia cassandra P. Bartsch, 1912 - (PYRAMIDELLIDAE)
- cassiana, Stuorilda cassiana K. Bandel, 1995 † - (AMPEZZANILDIDAE) (FOSSIL)
- cassiana, Amphitomaria cassiana (E.F.R.K. Koken, 1889 †) - (AMPHITOMARIIDAE) (FOSSIL)
- cassiana, Bandellina cassiana K. Bandel, 1996 † - (CORNIROSTRIDAE) (FOSSIL)
- cassiana, Naticopsis cassiana Wissmann, 1841 † - syn of: Hologyra cassiana (Wissmann, 1841 †) - (DELPHINULOPSIDAE) (FOSSIL)
- cassiana, Turritelloidea cassiana K. Bandel, 1995 † - (GORDENELLIDAE) (FOSSIL)
- cassiana, Halobia cassiana Mojsisovics, 1874 † - (HALOBIIDAE) (FOSSIL)
- cassiana, Lanascala cassiana K. Bandel, 1992 † - (LANASCALIDAE) (FOSSIL)
- cassiana, Worthenia cassiana E.A.L. Kittl, 1891 † - syn of: Wortheniella cassiana (E.A.L. Kittl, 1891 †) - (LOPHOSPIRIDAE) (FOSSIL)
- cassiana, Ebala cassiana K. Bandel, 1996 † - (MURCHISONELLIDAE) (FOSSIL)
- cassiana, Hologyra cassiana (Wissmann, 1841 †) - (NATICOPSIDAE) (FOSSIL)
- cassiana, Katosira cassiana E.A.L. Kittl, 1894 † - (SETTSASSIIDAE) (FOSSIL)
- cassiana, Melania cassiana Klipstein, 1843 - syn of: Lacuna vincta (G. Montagu, 1803) - (THIARIDAE)
- cassiana, Cristalloella cassiana K. Bandel, 1995 † - (TOFANELLIDAE) (FOSSIL)
- cassiana, Monodonta cassiana Wissmann, 1841 † - syn of: Pseudoclanculus cassianus (Wissmann, 1841 † † †) - (TROCHIDAE) (FOSSIL)
- cassiana, Wortheniella cassiana (E.A.L. Kittl, 1891 †) - (WORTHENIELLIDAE) (FOSSIL)
- Cassianastraea, syn of: Genus Bandelastraea Nützel & Kaim, 2014 † (ANOMPHALIDAE) (FOSSIL)
- CASSIANAXIDAE Bandel, 1996 † - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-ARCHITECTONICOIDEA [Superfamily]) (FOSSIL)
- Cassianaxis, Genus Cassianaxis K. Bandel, 1996 † (CASSIANAXIDAE) (FOSSIL)
- Cassianebala, Genus Cassianebala Bandel, 1996 † (CASSIANEBALIDAE) (FOSSIL)
- CASSIANEBALIDAE Bandel, 1996 † - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-STREPTACIDOIDEA [Superfamily]) (FOSSIL)
- Cassianella, Genus Cassianella Beyrich, 1862 † (CASSIANELLIDAE) (FOSSIL)
- CASSIANELLIDAE Ichikawa, 1958 † - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-PTERIIDA [Order]-PTERIOIDEA [Superfamily]) (FOSSIL)
- Cassianilda, Genus Cassianilda Bandel, 1995 † (AMPEZZANILDIDAE) (FOSSIL)
- Cassianocirrus, Genus Cassianocirrus Bandel, 1993 † (PORCELLIIDAE) (FOSSIL)
- Cassianoides, Genus Cassianoides Newell & Boyd, 1995 † (HETEROPECTINIDAE) (FOSSIL)
- Cassianopsis, Genus Cassianopsis Bandel, 2007 † (NERITOPSIDAE) (FOSSIL)
- Cassianozyga, Genus Cassianozyga Bandel , 1991 † (HARPIDAE) (FOSSIL)
- Cassianpisulina, Genus Cassianpisulina Bandel, 2007 † (NERITARIIDAE) (FOSSIL)
- cassianus, Pseudoclanculus cassianus (Wissmann, 1841 † † †) - (CHILODONTIDAE) (FOSSIL)
- cassianus, Euomphalus cassianus E.F.R.K. Koken, 1889 † - syn of: Amphitomaria cassiana (E.F.R.K. Koken, 1889 †) - (EUOMPHALIDAE) (FOSSIL)
- cassianus, Temnocheilus cassianus Mojsisovics, 1882 † - syn of: Germanonautilus cassianus (Mojsisovics, 1882 †) - (KONINCKIOCERATIDAE) (FOSSIL)
- cassianus, Littorina cassianus Wissmann, 1841 † - syn of: Prostylifer paludinaris (Münster, 1841 †) - (LITTORINIDAE) (FOSSIL)
- cassianus, Nautilus cassianus Mojsisovics, 1882 † - syn of: Germanonautilus cassianus (Mojsisovics, 1882 †) - (NAUTILIDAE) (FOSSIL)
- cassianus, Germanonautilus cassianus (Mojsisovics, 1882 †) - (TAINOCERATIDAE) (FOSSIL)
- cassianus, Tirolites cassianus (F.A. von Quenstedt, 1845 †) - (TIROLITIDAE) (FOSSIL)
- cassianus, Clanculus cassianus Wissmann, 1841 † - syn of: Pseudoclanculus cassianus (Wissmann, 1841 † † †) - (TROCHIDAE) (FOSSIL)
- cassiaui, Nucleolaria cassiaui C.M. Burgess, 1965 - (CYPRAEIDAE)
- Cassiavellia, Genus Cassiavellia Temkin & Pojeta, 2010 † (BAKEVELLIIDAE) (FOSSIL)
- cassiculum, Neritina latissima cassiculum (G.B. I Sowerby, 1836) - (NERITIDAE)
- cassiculus, Cyclopecten cassiculus H.H. Dijkstra & P. Maestrati, 2015 - (PROPEAMUSSIIDAE)
- cassida, Euaustenia cassida (F.W. Hutton) - (ARIOPHANTIDAE)
- cassida, Raspailiceras cassida (Raspail, 1830 †) - (BARREMITIDAE) (FOSSIL)
- Cassida, syn of: Genus Cassis J.A. Scopoli, 1777 (CASSIDAE)
- cassida, Leiostyla cassida (R.T. Lowe, 1831) - (LAURIIDAE)
- CASSIDAE Latreille, 1825 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-LITTORINIMORPHA [Order]-TONNOIDEA [Superfamily])
- Cassidaria, syn of: Genus Galeodea J.H.F. Link, 1807 (CASSIDAE)
- cassidariaeformis, Siphonalia cassidariaeformis (L.A. Reeve, 1846) - (BUCCINIDAE)
- cassidariaeformis conspersa, Siphonalia cassidariaeformis conspersa A. Adams, 1863 - (BUCCINIDAE)
- cassidariaeformis funerea, Siphonalia cassidariaeformis funerea H.A. Pilsbry, 1895 - (BUCCINIDAE)
- cassidariaeformis grisea, Siphonalia cassidariaeformis grisea A. Adams, 1863 - (BUCCINIDAE)
- cassidariaeformis ornata, Siphonalia cassidariaeformis ornata A. Adams, 1863 - (BUCCINIDAE)
- cassidariaeformis tosana, Siphonalia cassidariaeformis tosana (S. Hirase, 1908) - (BUCCINIDAE)
- cassidariaeformis vanattai, Siphonalia cassidariaeformis vanattai H.A. Pilsbry, 1905 - syn of: Siphonalia vanattai H.A. Pilsbry, 1905 - (BUCCINIDAE)
- Cassidea, syn of: Genus Cassis J.A. Scopoli, 1777 (CASSIDAE)
- cassidens, Gulella cassidens (L. Pfeiffer, 1859) - (STREPTAXIDAE)
- cassideum, Buccinum cassideum G.B. I Sowerby, 1825 - syn of: Demoulia abbreviata (J.F. Gmelin, 1791) - (BUCCINIDAE)
- cassidiforme, Pachybathron cassidiforme J.S. Gaskoin, 1853 - (CYSTISCIDAE)
- cassidiformis, Ampullaria cassidiformis L.A. Reeve, 1856 - syn of: Pomacea eximia (R.W. Dunker, 1853) - (AMPULLARIIDAE)
- cassidiformis, Euclia cassidiformis (G.B. I Sowerby, 1832) - (CANCELLARIIDAE)
- cassidiformis, Mesoginella cassidiformis (R. Tate, 1878) - (MARGINELLIDAE)
- cassidiformis, Xanthochorus cassidiformis (H.M.D. de Blainville, 1832) - (MURICIDAE)
- Cassidina, syn of: Genus Canopoconus Jiang, 1982 † (MAIKHANELLIDAE) (FOSSIL)
- cassidoides, Melchiorites cassidoides (Uhlig, 1883 †) - (DESMOCERATIDAE) (FOSSIL)
- cassidula, Galeodea cassidula G.S. Coen, 1920 - syn of: Galeodea echinophora (C. Linnaeus, 1758) - (CASSIDAE)
- Cassidula, Genus Cassidula J.E. Gray, 1847 (ELLOBIIDAE)
- cassidula, Leiostyla cassidula R.T. Lowe, 1852 - (LAURIIDAE)
- cassidula, Lyria cassidula (L.A. Reeve, 1849) - (VOLUTIDAE)
- cassidula, Voluta cassidula L.A. Reeve, 1849 - syn of: Lyria cassidula (L.A. Reeve, 1849) - (VOLUTIDAE)
- cassidula pallidula, Lyria cassidula pallidula T. Habe, 1962 - (VOLUTIDAE)
- Cassidulta, syn of: Genus Cassidula J.E. Gray, 1847 (ELLOBIIDAE)
- Cassidulus, syn of: Genus Cassidula J.E. Gray, 1847 (ELLOBIIDAE)
- Cassiella, Genus Cassiella S. Gofas, 1987 (CERITHIIDAE)
- cassiforme, Vasum cassiforme (L.C. Kiener, 1840) - (TURBINELLIDAE)
- cassina, Holopea cassina R.P. Whitfield, 1886 † - syn of: Plethospira cassina (R.P. Whitfield, 1886 †) - (HOLOPEIDAE) (FOSSIL)
- cassina, Lophospira cassina R.P. Whitfield, 1886 † - syn of: Straparollina cassina (R.P. Whitfield, 1886 †) - (LOPHOSPIRIDAE) (FOSSIL)
- cassina, Hormotoma cassina (R.P. Whitfield, 1897 †) - (MURCHISONIIDAE) (FOSSIL)
- cassina, Plethospira cassina (R.P. Whitfield, 1886 †) - (MURCHISONIIDAE) (FOSSIL)
- cassina, Murchisonia cassina R.P. Whitfield, 1897 † - syn of: Hormotoma cassina (R.P. Whitfield, 1897 †) - (MURCHISONIIDAE) (FOSSIL)
- cassina, Straparollina cassina (R.P. Whitfield, 1886 †) - (STRAPAROLLINIDAE) (FOSSIL)
- cassinaeformis, Venus cassinaeformis (M. Yokoyama, 1926) - (VENERIDAE)
- cassinense, Cyclostomiceras cassinense (R.P. Whitfield, 1886 †) - (CYCLOSTOMICERATIDAE) (FOSSIL)
- cassinense, Schroederoceras cassinense R.P. Whitfield, 1886 † - syn of: Curtoceras eatoni (R.P. Whitfield, 1886 †) - (TROCHOLITIDAE) (FOSSIL)
- cassinensis, Bellerophon cassinensis R.P. Whitfield, 1886 † - syn of: Peruniscus cassinensis (R.P. Whitfield, 1886 †) - (BELLEROPHONTIDAE) (FOSSIL)
- cassinensis, Ambigua fuscolabiata cassinensis (Tagliani, 1942) - (HELICIDAE)
- cassinensis, Peruniscus cassinensis (R.P. Whitfield, 1886 †) - (TROPIDODISCIDAE) (FOSSIL)
- Cassinia, syn of: Genus Cassis J.A. Scopoli, 1777 (CASSIDAE)
- cassiniacum, Cochlostoma montanum cassiniacum (A.de Saint-Simon, 1878) - (COCHLOSTOMATIDAE)
- cassinianus, Deltoidonautilus cassinianus (Foord & Crick, 1890 †) - (HERCOGLOSSIDAE) (FOSSIL)
- cassiniensis, Nannochlora cassiniensis (E.A. Smith, 1894) - (CAMAENIDAE)
- Cassinoceras, Genus Cassinoceras Ulrich & Foerste, 1936 † (PILOCERATIDAE) (FOSSIL)
- Cassiope, Genus Cassiope Coquand, 1865 † (CASSIOPIDAE) (FOSSIL)
- cassiope, Trigonia cassiope Lycett ex d'Orbigny † - (TRIGONIIDAE) (FOSSIL)
- cassiopea, Octopus cassiopea J.E. Gray, 1849 - syn of: Octopus vulgaris G.L.C.F.D. Cuvier, 1797 - (OCTOPODIDAE)
- cassiopeia, Octopus cassiopeia J.E. Gray, 1849 - syn of: Octopus vulgaris G.L.C.F.D. Cuvier, 1797 - (OCTOPODIDAE)
- Cassiopella, Subgenus Cassiope (Cassiopella) Kase, 1984 † (CASSIOPIDAE) (FOSSIL)
- CASSIOPIDAE Beurlen, 1967 † - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-CERITHIOIDEA [Superfamily]) (FOSSIL)
- Cassipelia, Genus Cassipelia † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- cassiquiensis, Habroconus cassiquiensis W. Newcomb - (EUCONULIDAE)
- cassis, Acmaea cassis W.H. Dall - syn of: Lottia cassis (J.F. von Eschscholtz, 1833) - (ACMAEIDAE)
- cassis, Acmaea cassis J. Rathke in J.F. von Eschscholtz, 1833 - syn of: Lottia pelta (J. Rathke in J.F. von Eschscholtz, 1833) - (ACMAEIDAE)
- cassis, Thysanodonta cassis C. Vilvens & P. Maestrati, 2006 - (CALLIOSTOMATIDAE)
- Cassis, Genus Cassis J.A. Scopoli, 1777 (CASSIDAE)
- cassis, Conus cassis Lozet & Lozet, 1978 - syn of: Graphiconus broderipii (L.A. Reeve, 1844) - (CONIDAE)
- cassis, Lottia cassis (J.F. von Eschscholtz, 1833) - (LOTTIIDAE)
- cassis, Propebela cassis I.P. Bogdanov, 1989 - (MANGELIIDAE)
- cassis, Prunum cassis (W.H. Dall, 1889) - (MARGINELLIDAE)
- cassis, Tonna cassis P.F. Röding, 1798 - syn of: Tonna dolium (C. Linnaeus, 1758) - (TONNIDAE)
- cassis, Plemeroceras cassis Stridsberg, 1985 † - (TRIMEROCERATIDAE) (FOSSIL)
- cassisianum, Gaudryceras cassisianum A.V.M.D. D'Orbigny, 1850 † - (GAUDRYCERATIDAE) (FOSSIL)
- Cassisoma, syn of: Genus Cassis J.A. Scopoli, 1777 (CASSIDAE)
- Cassitella, Genus Cassitella Malinky & Skovsted, 2004 † (COLEOLIDAE) (FOSSIL)
- cassium, Parvamussium cassium H.H. Dijkstra, 1991 - (PROPEAMUSSIIDAE)
- Cassoginella, syn of: Genus Alaginella C.F. Laseron, 1957 (MARGINELLIDAE)
- Cassowarioides, Genus Cassowarioides Johnston & Chatterton, 1983 † (PSEUDOBIGALEAIDAE) (FOSSIL)
- casta, Achatinella casta W. Newcomb, 1854 - (ACHATINELLIDAE)
- casta, Leucotina casta (A. Adams, 1853) - (AMATHINIDAE)
- casta, Trishoplita collinsoni casta H.A. Pilsbry, 1901 - (BRADYBAENIDAE)
- casta, Turricula casta H. Adams, 1872 - syn of: Vexillum castum (H. Adams, 1872) - (CLAVATULIDAE)
- casta, Cardiomya casta (R.B. Hinds, 1843) - (CUSPIDARIIDAE)
- casta, Notocypraea comptonii casta (F.A. Schilder & R.H. Summers, 1963) - (CYPRAEIDAE)
- casta, Mazescala casta A. Adams, 1873 - syn of: Epitonium castum (A. Adams, 1873) - (EPITONIIDAE)
- casta, Hypermastus casta (A. Adams, 1861) - (EULIMIDAE)
- casta, Ludwigella casta Buckman, 1901 † - syn of: Graphoceras castum (Buckman, 1901 †) - (GRAPHOCERATIDAE) (FOSSIL)
- casta, Helix casta C.A. Westerlund, 1898 - syn of: Assyriella djulfensis (F. Dubois De Montpéreux, 1840) - (HELICIDAE)
- casta, Janthina casta L.A. Reeve, 1858 - syn of: Janthina janthina (C. Linnaeus, 1758) - (JANTHINIDAE)
- casta, Scabricola casta (J.F. Gmelin, 1791) - (MITRIDAE)
- casta, Swainsonia casta (J.F. Gmelin, 1791) - syn of: Scabricola casta (J.F. Gmelin, 1791) - (MITRIDAE)
- casta, Mysella casta (A.E. Verrill & K.J. Bush, 1898) - (MONTACUTIDAE)
- casta, Arvella casta (A. Adams, 1862) - (MYTILIDAE)
- casta, Tritia casta (A.A. Gould, 1850) - (NASSARIIDAE)
- casta, Nassa casta A.A. Gould, 1850 - syn of: Tritia casta (A.A. Gould, 1850) - (NASSARIIDAE)
- casta, Pyrgulina casta (A. Adams, 1861) - (PYRAMIDELLIDAE)
- casta, Pyrgulina casta (C.B. Adams, 1864) - (PYRAMIDELLIDAE)
- casta, Monotygma casta A. Adams, 1853 - syn of: Leucotina casta (A. Adams, 1853) - (PYRAMIDELLIDAE)
- casta, Daphnella casta R.B. Hinds, 1844 - (RAPHITOMIDAE)
- casta, Semele casta Adams, 1853 - (SEMELIDAE)
- casta, Minolops casta (G. Nevill & H. Nevill, 1874) - (SOLARIELLIDAE)
- casta, Succinea casta C.M.F. Ancey, 1899 - (SUCCINEIDAE)
- casta, Abranda casta (S.C.T. Hanley, 1844) - (TELLINIDAE)
- casta, Tellina casta S.C.T. Hanley, 1844 - syn of: Abranda casta (S.C.T. Hanley, 1844) - (TELLINIDAE)
- casta, Hastula casta R.B. Hinds, 1844 - syn of: Hastula albula (K.T. Menke, 1843) - (TEREBRIDAE)
- casta, Iniforis casta (R.B. Hinds, 1843) - (TRIPHORIDAE)
- Casta, syn of: Genus Apoma H.H. Beck, 1837 (UROCOPTIDAE)
- casta, Meretrix casta (J.F. Gmelin, 1791) - (VENERIDAE)
- casta, Venus casta J.F. Gmelin, 1791 - syn of: Meretrix casta (J.F. Gmelin, 1791) - (VENERIDAE)
- casta, Adranella casta (A.E. Verrill & K.J. Bush, 1898) - (YOLDIIDAE)
- casta dianae, Leucotina casta dianae A. Adams, 1854 - syn of: Leucotina dianae (A. Adams, 1854) - (AMATHINIDAE)
- casta henshawi, Succinea casta henshawi C.M.F. Ancey, 1904 - (SUCCINEIDAE)
- casta margaretae, Achatinella casta margaretae H.A. Pilsbry & C.M. Cooke, 1914 - (ACHATINELLIDAE)
- casta natalensis, Terebra casta natalensis E.A. Smith, 1903 - syn of: Hastula albula (K.T. Menke, 1843) - (TEREBRIDAE)
- casta orophila, Succinea casta orophila C.M.F. Ancey, 1904 - (SUCCINEIDAE)
- castacana, Angulus castacana Anderson & G.D. Hanna, 1925 † - (TELLINIDAE) (FOSSIL)
- castacensis, Eocypraea castacensis A.E.M. Cossmann 1903 † - (EOCYPRAEIDAE) (FOSSIL)
- castagni, Truncacila castagni Forner & Valls, 2012 † - (NUCULIDAE) (FOSSIL)
- castagnolai, Pseudaetomoceras castagnolai Cocchi, 1882 † - (ARIETITIDAE) (FOSSIL)
- castaicensis, Pyrgulopsis castaicensis R. Hershler & H.P. Liu, 2010 - (HYDROBIIDAE)
- castalia, Idyla castalia (J.R. Roth, 1856) - (CLAUSILIIDAE)
- Castalia, Genus Castalia M.J.C.L. de Savigny, 1822 (HYRIIDAE)
- castalia boschi, Idyla castalia boschi H. Nordsieck, 1975 - (CLAUSILIIDAE)
- castalia crenilabris, Idyla castalia crenilabris (O. Böttger, 1885) - (CLAUSILIIDAE)
- castalia herae, Idyla castalia herae I. Sajó, 1968 - (CLAUSILIIDAE)
- castalia unidentata, Idyla castalia unidentata (H.C. Küster, 1861) - (CLAUSILIIDAE)
- castalia yeruni, Idyla castalia yeruni (E. Gittenberger, 2002) - (CLAUSILIIDAE)
- Castaliella, Genus Castaliella C.T. Simpson, 1900 (HYRIIDAE)
- Castalina, Genus Castalina von Ihering, 1891 (HYRIIDAE)
- castanaeonitens, Drepanotrema castanaeonitens H.A. Pilsbry & E.G. Vanatta, 1896 - (PLANORBIDAE)
- Castanayiceras, syn of: Genus Castanyiceras Rakús & Guex, 2002 † (LYTOCERATIDAE) (FOSSIL)
- castanea, Auriculella castanea (L. Pfeiffer, 1853) - (ACHATINELLIDAE)
- castanea, Chelidonura castanea N. Yonow, 1994 - (AGLAJIDAE)
- castanea, Amastra rubens castanea A. Hyatt & H.A. Pilsbry, 1911 - (AMASTRIDAE)
- castanea, Pomacea castanea G.P. Deshayes, 1830 - syn of: Pomacea glauca (C. Linnaeus, 1758) - (AMPULLARIIDAE)
- castanea, Ancilla castanea (G.B. I Sowerby, 1830) - (ANCILLARIIDAE)
- castanea, Angustassiminea castanea (C.A. Westerlund, 1883) - (ASSIMINEIDAE)
- castanea, Assiminea castanea (C.A. Westerlund, 1883) - syn of: Angustassiminea castanea (C.A. Westerlund, 1883) - (ASSIMINEIDAE)
- castanea, Astarte castanea (T. Say, 1822) - (ASTARTIDAE)
- castanea, Bothriembryon melo castanea (G.P. Deshayes, 1838) - (BOTHRIEMBRYONTIDAE)
- castanea, Prodotia castanea (J.C. Melvill, 1912) - (BUCCINIDAE)
- castanea, Bulla castanea A. Adams, 1850 - syn of: Bulla quoyii J.E. Gray, 1843 - (BULLIDAE)
- castanea, Zachrysia guanensis castanea C.G. Aguayo & M.L. Jaume, 1954 - (CAMAENIDAE)
- castanea, Laevicardium castanea E. Vidal, 2005 - (CARDIIDAE)
- castanea, Cardita castanea G.P. Deshayes, 1854 - (CARDITIDAE)
- castanea, Skenella castanea (C.F. Laseron, 1950) - (CINGULOPSIDAE)
- castanea, Selenophaedusa castanea H. Nordsieck, 2012 - (CLAUSILIIDAE)
- castanea, Clavatula castanea J. Brown, 1827 - (CLAVATULIDAE)
- castanea, Colubraria castanea J.T. Kuroda & T. Habe, 1952 - syn of: Colubraria tenera (J.E. Gray, 1839) - (COLUBRARIIDAE)
- castanea, Columbella castanea G.B. I Sowerby, 1832 - (COLUMBELLIDAE)
- castanea, Columbella castanea A.A. Gould, 1850 - syn of: Alia unifasciata (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- castanea, Eucrassatella castanea L.A. Reeve, 1842 - syn of: Eucrassatella donacina (J.B.P.A. Lamarck, 1805) - (CRASSATELLIDAE)
- castanea, Cypraeovula castanea (H.C. Higgins, 1868) - (CYPRAEIDAE)
- castanea, Cypraea castanea C.J. Anderson, 1836 - syn of: Notocypraea angustata (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- castanea, Mauritia castanea P.F. Röding, 1798 - syn of: Mauritia mauritiana (C. Linnaeus, 1758) - (CYPRAEIDAE)
- castanea, Corbicula castanea (P.M.A. Morelet, 1865) - (CYRENIDAE)
- castanea, Sclerodoris castanea E.F. Kelaart, 1858 - syn of: Sclerodoris tuberculata C.N.E. Eliot, 1904 - (DISCODORIDIDAE)
- castanea, Tylotiella castanea G.B. Sowerby, 1897 - syn of: Clavus hottentotus (E.A. Smith, 1882) - (DRILLIIDAE)
- castanea, Eatoniella castanea W.F. Ponder & H.W. Worsfold, 1994 - (EATONIELLIDAE)
- castanea, Epitonium castanea T. Habe, 1961 - syn of: Epitonium tenuiliratum (G.B. II Sowerby, 1874) - (EPITONIIDAE)
- castanea, Microcystis castanea K.C. Emberton & T.A. Pearce, 2000 - (EUCONULIDAE)
- castanea, Fusceulima castanea (C.F. Laseron, 1955) - (EULIMIDAE)
- castanea, Pelseneeria castanea (W.H. Dall, 1925) - (EULIMIDAE)
- castanea, Pseudogaleomma castanea T. Habe, 1976 - (GALEOMMATIDAE)
- castanea, Goniodoris castanea J. Alder & A. Hancock, 1845 - (GONIODORIDIDAE)
- castanea, Helicarion castanea L. Pfeiffer, 1853 - (HELICARIONIDAE)
- castanea, Helix castanea E.A. Rossmässler, 1836 - syn of: Chilostoma squammatinum (A. Moquin-Tandon, 1855) - (HELICIDAE)
- castanea, Leiostyla castanea R.J. Shuttleworth, 1852 - syn of: Leiostyla anglica (W. Wood, 1828) - (LAURIIDAE)
- castanea, Cremnoconchus castanea D.G. Reid, N.A. Aravind & N.A. Madhyastha, 2013 - (LITTORINIDAE)
- castanea, Littorina castanea P. Dautzenberg & H. Fischer, 1915 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- castanea, Littorina castanea G.P. Deshayes, 1843 - syn of: Littorina saxatilis (A.G. Olivi, 1792) - (LITTORINIDAE)
- castanea, Spisula castanea J.B.P.A. Lamarck, 1818 - syn of: Spisula solida (C. Linnaeus, 1758) - (MACTRIDAE)
- castanea, Eucithara castanea (L.A. Reeve, 1846) - (MANGELIIDAE)
- castanea, Oenopota castanea T. Brown, 1827 - syn of: Propebela turricula (G. Montagu, 1803) - (MANGELIIDAE)
- castanea, Marginella castanea L.W. Dillwyn, 1817 - syn of: Marginella aurantia J.B.P.A. Lamarck, 1822 - (MARGINELLIDAE)
- castanea, Mitra castanea P.F. Röding, 1798 - syn of: Mitra nigra (J.F. Gmelin, 1791) - (MITRIDAE)
- castanea, Mitra castanea A. Adams, 1853 - syn of: Mitra badia L.A. Reeve, 1844 - (MITRIDAE)
- castanea, Orania castanea (H.C. Küster, 1886) - (MURICIDAE)
- castanea, Nucella castanea H.C. Küster, 1886 - syn of: Orania castanea (H.C. Küster, 1886) - (MURICIDAE)
- castanea, Thais castanea H.C. Küster, 1886 - syn of: Orania castanea (H.C. Küster, 1886) - (MURICIDAE)
- castanea, Purpura castanea H.C. Küster, 1886 - syn of: Orania castanea (H.C. Küster, 1886) - (MURICIDAE)
- castanea, Nucella lapillus castanea P. Dautzenberg, 1882 - (MURICIDAE)
- castanea, Natica castanea J.B.P.A. Lamarck, 1822 - syn of: Euspira catena (E.M. Da Costa, 1778) - (NATICIDAE)
- castanea, Clithon castanea (J.B. Hombron & C.H. Jacquinot, 1854) - (NERITIDAE)
- castanea, Nucula castanea A. Adams, 1856 - syn of: Nucula nitidula Adams, 1856 - (NUCULIDAE)
- castanea, Euvaricella castanea H.B. Baker, 1935 - (OLEACINIDAE)
- castanea, Oliva peruviana castanea J. Ford in C.W. Johnson, 1911 - (OLIVIDAE)
- castanea, Oliva flammulata castanea P. Dautzenberg, 1910 - (OLIVIDAE)
- castanea, Prionovolva castanea C.N. Cate, 1978 - syn of: Prionovolva brevis (Sowerby, 1825) - (OVULIDAE)
- castanea, Partula castanea W.H. Pease - (PARTULIDAE)
- castanea, Costatella castanea A. Moquin-Tandon, 1843 - syn of: Physella acuta (J.P.R. Draparnaud, 1805) - (PHYSIDAE)
- castanea, Holandriana castanea (J.R. Bourguignat, 1884) - (PLEUROCERIDAE)
- castanea, Melanella castanea J.R. Bourguignat, 1884 - syn of: Holandriana castanea (J.R. Bourguignat, 1884) - (PLEUROCERIDAE)
- castanea, Goniobasis laqueata castanea (I. Lea, 1841) - (PLEUROCERIDAE)
- castanea, Poromya castanea (T. Habe, 1952) - (POROMYIDAE)
- castanea, Dermatomya castanea (T. Habe, 1952) - syn of: Poromya castanea (T. Habe, 1952) - (POROMYIDAE)
- castanea, Sanguinolaria castanea O.A. Scarlato, 1965 - syn of: Gari chinensis (G.P. Deshayes, 1855) - (PSAMMOBIIDAE)
- castanea, Pteria castanea L.A. Reeve, 1857 - syn of: Pteria heteroptera (J.B.P.A. Lamarck, 1819) - (PTERIIDAE)
- castanea, Turbonilla castanea (J. Keep, 1887) - (PYRAMIDELLIDAE)
- castanea, Tropaeas castanea (A. Adams, 1863) - (PYRAMIDELLIDAE)
- castanea, Odostomia castanea T. Habe, 1961 - (PYRAMIDELLIDAE)
- castanea, Pleurotomella castanea W.H. Dall, 1896 - syn of: Phymorhynchus castaneus (W.H. Dall, 1896) - (RAPHITOMIDAE)
- castanea, Manzonia castanea R.G. Moolenbeek & M.J. Faber, 1987 - (RISSOIDAE)
- castanea, Boreocingula castanea (H.P.C. Møller, 1842) - (RISSOIDAE)
- castanea, Cingula castanea Auct. non H.P.C. Møller, 1842 - syn of: Onoba mighelsii (W. Stimpson, 1851) - (RISSOIDAE)
- castanea, Onoba castanea H.P.C. Møller, 1842 - syn of: Boreocingula castanea (H.P.C. Møller, 1842) - (RISSOIDAE)
- castanea, Rissoa janusi castanea (F. Nordsieck, 1972) - (RISSOIDAE)
- castanea, Ervilia castanea (G. Montagu, 1803) - (SEMELIDAE)
- castanea, Oreohomorus castanea (E.C. Von Martens, 1895) - (SUBULINIDAE)
- castanea, Impages castanea L.C. Kiener, 1839 - syn of: Hastula hectica (C. Linnaeus, 1758) - (TEREBRIDAE)
- castanea, Turbo castanea J.F. Gmelin, 1791 - (TURBINIDAE)
- castanea, Anodon castanea P.M. Heude, 1880 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- castanea, Trilamellaxis castanea (C. de la Torre, 1911) - (UROCOPTIDAE)
- castanea, Venus castanea T. Say, 1822 - syn of: Astarte castanea (T. Say, 1822) - (VENERIDAE)
- castanea, Periglypta castanea J.B.P.A. Lamarck, 1818 - syn of: Meretrix meretrix (C. Linnaeus, 1758) - (VENERIDAE)
- castanea, Paludina castanea A. Valenciennes, 1827 - (VIVIPARIDAE)
- castanea, Pilsbryna castanea H.B. Baker, 1931 - (ZONITIDAE)
- castanea castanella, Trilamellaxis castanea castanella C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- castanea crenulatus, Turbo castanea crenulatus J.F. Gmelin, 1791 - (TURBINIDAE)
- castanea fantomei, Colubraria castanea fantomei T.A. Garrard, 1961 - syn of: Colubraria tenera (J.E. Gray, 1839) - (COLUBRARIIDAE)
- castanea latebrosa, Cypraeovula castanea latebrosa S. Swarts & W. Liltved in W. Liltved, 2000 - (CYPRAEIDAE)
- castanea malani, Cypraeovula castanea malani F.Jr. Lorenz & B. de Bruin, 2009 - (CYPRAEIDAE)
- castanea procera, Astarte castanea procera J.G. Totten, 1835 - syn of: Astarte castanea (T. Say, 1822) - (ASTARTIDAE)
- castaneaensis, Paladilhia castaneaensis H. Girardi, 2015 - (MOITESSIERIIDAE)
- castanedoi, Spiroceramus castanedoi C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- castanella, Turbonilla castanella W.H. Dall, 1908 - (PYRAMIDELLIDAE)
- castanella, Onoba castanella (W.H. Dall, 1886) - (RISSOIDAE)
- castanella, Xenuroturris castanella A.W.B. Powell, 1964 - (TURRIDAE)
- castanella, Trilamellaxis castanea castanella C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- castaneocincta, Greenwoodoconcha castaneocincta (E.R. Sykes, 1900) - (EUCONULIDAE)
- castaneocinctus, Babelomurex castaneocinctus S. Kosuge, 1980 - syn of: Babelomurex princeps castaneocinctus (S. Kosuge, 1980) - (MURICIDAE)
- castaneocinctus, Babelomurex princeps castaneocinctus (S. Kosuge, 1980) - (MURICIDAE)
- castaneofusca, Terebra castaneofusca K.H.J. Thiele, 1925 - syn of: Strioterebrum plumbeum (J.R.C. Quoy & J.P. Gaimard, 1833) - (TEREBRIDAE)
- castaneofusca, Triphora castaneofusca K.H.J. Thiele, 1930 - (TRIPHORIDAE)
- castaneogramma, Phosinella castaneogramma (A. Garrett, 1873) - (RISSOINIDAE)
- castaneolabiata, Macrochlamys castaneolabiata H.H. Godwin-Austen - (ARIOPHANTIDAE)
- castaneonitens, Planorbis castaneonitens H.A. Pilsbry & E.G. Vanatta, 1896 - syn of: Drepanotrema lucidum (L. Pfeiffer, 1839) - (PLANORBIDAE)
- castaneosticta, Mitra castaneosticta P. Dautzenberg & J.L. Bouge, 1923 - syn of: Vexillum sanguisugum (C. Linnaeus, 1758) - (MITRIDAE)
- castaneosticta, Daphnella souverbiei castaneosticta R.P.J. Hervier, 1897 - (RAPHITOMIDAE)
- castaneostictum, Vexillum sanguisugum castaneostictum P. Dautzenberg & H. Fischer, 1906 - (COSTELLARIIDAE)
- castaneostriata, Terebra castaneostriata S. Kosuge, 1979 - (TEREBRIDAE)
- castaneostriatum, Vexillum castaneostriatum M. Herrmann, 2012 - (COSTELLARIIDAE)
- castaneostrigatus, Drymaeus castaneostrigatus S.I. Da Costa, 1906 - (BULIMULIDAE)
- castaneotinctus, Babelomurex castaneotinctus S. Kosuge, 1980 - syn of: Babelomurex princeps castaneocinctus (S. Kosuge, 1980) - (MURICIDAE)
- castaneozonatus, Liguus fasciatus castaneozonatus H.A. Pilsbry, 1912 - (ORTHALICIDAE)
- castaneum, Buccinum castaneum W.H. Dall, 1877 - (BUCCINIDAE)
- castaneum, Chlorostoma castaneum A. Adams, 1851 - (TEGULIDAE)
- castaneum, Vasum castaneum P.F. Röding, 1798 - syn of: Menathais tuberosa (P.F. Röding, 1798) - (TURBINELLIDAE)
- castaneum, Dissotropis castaneum F.G. Thompson, 1968 - (UROCOPTIDAE)
- castaneus, Acavus phoenix castaneus Hansdorf & M.L. Perera, 2000 - (ACAVIDAE)
- castaneus, Eurytus castaneus (L. Pfeiffer, 1845) - (AMPHIBULIMIDAE)
- castaneus, Volutopsius castaneus (O.A.L. Mörch, 1857) - (BUCCINIDAE)
- castaneus, Bulimus castaneus L. Pfeiffer, 1845 - syn of: Eurytus castaneus (L. Pfeiffer, 1845) - (BULIMULIDAE)
- castaneus, Callochiton dentatus castaneus (W. Wood, 1815) - (CALLOCHITONIDAE)
- castaneus, Joculator castaneus A. Cecalupo & I. Perugia, 2013 - (CERITHIOPSIDAE)
- castaneus, Chiton castaneus A.A. Gould, 1852 - syn of: Hemiarthrum setulosum P.P. Carpenter in W.H. Dall, 1876 - (CHITONIDAE)
- castaneus, Dauciconus castaneus L.C. Kiener, 1848 - (CONIDAE)
- castaneus, Boucardicus castaneus K.C. Emberton, 2002 - (CYCLOPHORIDAE)
- castaneus, Donax castaneus G. Montagu, 1803 - syn of: Ervilia castanea (G. Montagu, 1803) - (DONACIDAE)
- castaneus, Melampus castaneus J.K. Megerle Von Mühlfeld, 1818 - (ELLOBIIDAE)
- castaneus, Buliminus castaneus C.A. Westerlund, 1897 - syn of: Pseudonapaeus trigonochilus (C.M.F. Ancey, 1886) - (ENIDAE)
- castaneus, Latirus castaneus (J.E. Gray, 1839) - (FASCIOLARIIDAE)
- castaneus, Fusus castaneus O.A.L. Mörch, 1857 - syn of: Volutopsius castaneus (O.A.L. Mörch, 1857) - (FASCIOLARIIDAE)
- castaneus, Latirus castaneus L.A. Reeve, 1847 - syn of: Pustulatirus mediamericanus (L.G. Hertlein & A.M. Strong, 1951) - (FASCIOLARIIDAE)
- castaneus, Glycymeris castaneus J.B.P.A. Lamarck, 1819 - syn of: Glycymeris undata (C. Linnaeus, 1758) - (GLYCYMERIDIDAE)
- castaneus, Murex castaneus G.B. II Sowerby, 1834 - syn of: Chicoreus capucinus (J.B.P.A. Lamarck, 1822) - (MURICIDAE)
- castaneus, Lioberus castaneus (T. Say, 1822) - (MYTILIDAE)
- castaneus, Leiosolenus castaneus L.A. Reeve, 1857 - syn of: Leiosolenus spatiosus (P.P. Carpenter, 1857) - (MYTILIDAE)
- castaneus, Mytilus castaneus W. Wood, 1828 - syn of: Arenifodiens vagina (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- castaneus, Mytilus castaneus J. Lightfoot, 1786 - syn of: Arenifodiens vagina (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- castaneus, Liguus fasciatus castaneus C.T. Simpson, 1920 - (ORTHALICIDAE)
- castaneus, Planaxis castaneus E.A. Smith, 1872 - (PLANAXIDAE)
- castaneus, Phymorhynchus castaneus (W.H. Dall, 1896) - (RAPHITOMIDAE)
- castaneus, Turbo castaneus J.F. Gmelin, 1792 † - (TURBINIDAE) (FOSSIL)
- castaneus, Unio castaneus I. Lea, 1831 - syn of: Obovaria arkansasensis (I. Lea, 1862) - (UNIONIDAE)
- castaneus, Unio castaneus L.I. Fitzinger, 1833 - syn of: Unio crassus L. Philipsson in A. Retzius, 1788 - (UNIONIDAE)
- castani, Trigonia castani Henry, 1876 † - (TRIGONIIDAE) (FOSSIL)
- castanoi, Farcimen imperator castanoi L.O. Alcalde, 1945 - (MEGALOMASTOMIDAE)
- castanoleuca, Peristernia castanoleuca C.M. Tapparone-Canefri, 1879 - (FASCIOLARIIDAE)
- Castanophaedusa, Genus Castanophaedusa Páll-Gergely & Szekeres, 2017 (CLAUSILIIDAE)
- Castanyiceras, Genus Castanyiceras Rakús & Guex, 2002 † (LYTOCERATIDAE) (FOSSIL)
- castelinae, Clathropsis castelinae A. Cecalupo & I. Perugia, 2014 - (CERITHIOPSIDAE)
- castelinae, Bolma castelinae A. Alf, P. Maestrati & P. Bouchet, 2010 - (TURBINIDAE)
- castella, Pisinna castella (C.F. Laseron, 1950) - (ANABATHRIDAE)
- castellana, Murella nebrodensis castellana (T.A. de M. Monterosato, 1892) - (HELICIDAE)
- Castellana, syn of: Subgenus Helicella (Xerotricha) T.A. de M. Monterosato, 1892 (HYGROMIIDAE)
- castellanoi, Annularisca victoris castellanoi C.G. Aguayo - (POMATIIDAE)
- castellanosae, Heleobia castellanosae J.M. Gaillard, 1974 - (COCHLIOPIDAE)
- castellastuana, Agathylla regularis castellastuana (A.J. Wagner, 1918) - (CLAUSILIIDAE)
- castellata, Anadara satowi castellata M. Yokoyama, 1923 † - (ARCIDAE) (FOSSIL)
- castellata, Agathotoma castellata (E.A. Smith, 1888) - (MANGELIIDAE)
- castellata, Pseudorhaphitoma castellata E.A. Smith, 1888 - syn of: Agathotoma castellata (E.A. Smith, 1888) - (MANGELIIDAE)
- castellata, Pleurotoma castellata E.A. Smith, 1888 - syn of: Agathotoma castellata (E.A. Smith, 1888) - (TURRIDAE)
- castellensis, Albinaria brevicollis castellensis (L. Pfeiffer, 1855) - (CLAUSILIIDAE)
- castellensis, Harleites castellensis Reeside, 1932 † - (COLLIGNONICERATIDAE) (FOSSIL)
- castelli, Bakevellia castelli Wittenburg, 1908 † - (BAKEVELLIIDAE) (FOSSIL)
- castelli, Bullata castelli Abbass, 1967 † - (MARGINELLIDAE) (FOSSIL)
- castelli, Moridunoceras castelli J. Evans, 2005 † - (TROEDSSONELLIDAE) (FOSSIL)
- Castelliana, Subgenus Acrotoma (Castelliana) A.N. Suvorov, 2002 (CLAUSILIIDAE)
- castellini, Melanatria castellini (A. Brongniart, 1823 †) - (PACHYCHILIDAE) (FOSSIL)
- castellobrancoi, Ostrea castellobrancoi C.J. Maury, 1936 † - (OSTREIDAE) (FOSSIL)
- Castelloceras, Genus Castelloceras Evans , 2005 † (BALTOCERATIDAE) (FOSSIL)
- castelloi, Pomacea castelloi (G.B. III Sowerby, 1894) - (AMPULLARIIDAE)
- castellonica, Spiralix valenciana castellonica H.D. Boeters, 2003 - (MOITESSIERIIDAE)
- castelluccensis, Ambigua fuscolabiata castelluccensis (W. Kobelt, 1906) - (HELICIDAE)
- castelnaudi, Megalobulimus leucostomus castelnaudi (L.H. Hupé, 1857) - (MEGALOBULIMIDAE)
- castelnaudi, Leila blainvilliana castelnaudi L.H. Hupé, 1857 - (MYCETOPODIDAE)
- castelnaudii, Pomacea maculata castelnaudii L.H. Hupé, 1857 - (AMPULLARIIDAE)
- castelnaudii, Leila castelnaudii L.H. Hupé, 1857 - syn of: Leila blainvilliana castelnaudi L.H. Hupé, 1857 - (MYCETOPODIDAE)
- castelnaudii, Psadara castelnaudii (L.H. Hupé & L. Deville, 1850) - (PLEURODONTIDAE)
- castelnaudii, Anodonta castelnaudii L.H. Hupé, 1857 - syn of: Anodontites trigona (J.B. von Spix & J.A. Wagner, 1827) - (UNIONIDAE)
- castelnaui, Bulimulus castelnaui (L. Pfeiffer, 1857) - (BULIMULIDAE)
- castelneaui, Harmandia somboriensis castelneaui A. de Rochebrune, 1904 - (UNIONIDAE)
- casterasi, Pseudoschloenbachia casterasi M. Collignon 1983 † - (MUNIERICERATIDAE) (FOSSIL)
- Casterella, Genus Casterella Mendes , 1952 † (MODIOMORPHIDAE) (FOSSIL)
- casteri, Brevicoceras casteri Flower, 1938 † - (BREVICOCERATIDAE) (FOSSIL)
- Casteria, Genus Casteria † (PTERIIDAE) (FOSSIL)
- Casteroceras, Genus Casteroceras Flower, 1936 † (RUTOCERATIDAE) (FOSSIL)
- casterorum, Natalissima casterorum (Fleming, 1957 †) - (NATALISSIMIDAE) (FOSSIL)
- casterorum, Pseudaviculopecten casterorum Fleming, 1957 † - syn of: Natalissima casterorum (Fleming, 1957 †) - (PTERINOPECTINIDAE) (FOSSIL)
- casterorum, Pterinopecten casterorum Fleming, 1957 † - syn of: Natalissima casterorum (Fleming, 1957 †) - (PTERINOPECTINIDAE) (FOSSIL)
- castexi, Aporrhais castexi Magne, 1952 † - syn of: Aporrhais meridionalis B. de Basterot, 1825 † - (APORRHAIDAE) (FOSSIL)
- castianira, Crockerella castianira (W.H. Dall, 1919) - (CLATHURELLIDAE)
- castianira, Clathrodrillia castianira W.H. Dall, 1919 - syn of: Crockerella castianira (W.H. Dall, 1919) - (DRILLIIDAE)
- castigata, Ringicula castigata J. Marwick, 1929 † - (RINGICULIDAE) (FOSSIL)
- castigata, Zetela castigata (J. Marwick, 1931 †) - (SOLARIELLIDAE) (FOSSIL)
- castigata, Granuliterebra castigata (A.H. Cooke, 1885) - (TEREBRIDAE)
- castigata, Dosinia castigata J. Marwick, 1960 † - (VENERIDAE) (FOSSIL)
- castilla, Calliostoma castilla A.A. Olsson, 1922 † - (CALLIOSTOMATIDAE) (FOSSIL)
- castillai, Aeneator castillai J.H. McLean & B.G. Andrade, 1982 - (BUCCINIDAE)
- castlecliffensis, Austrorissopsis castlecliffensis (Finlay, 1930 †) - (ACLIDIDAE) (FOSSIL)
- castlecliffensis, Odostomia castlecliffensis C.R. Laws, 1939 - (PYRAMIDELLIDAE)
- castlemanensis, Worthenia castlemanensis Lintz Jr., 1958 † - (LOPHOSPIRIDAE) (FOSSIL)
- castlensis, Badouxia castlensis Longridge & al., 2006 † - (PSILOCERATIDAE) (FOSSIL)
- castleraghensis, Chrysallida castleraghensis E. Saurin, 1959 - (PYRAMIDELLIDAE)
- castor, Oxytesta castor (W. Theobald) - (ARIOPHANTIDAE)
- castor, Cyclocardia castor (W.H. Dall †) - (CARDITIDAE) (FOSSIL)
- castor, Marstonia castor F.G. Thompson, 1977 - (HYDROBIIDAE)
- castor, Kosmoceras castor Reinecke, 1818 † - (KOSMOCERATIDAE) (FOSSIL)
- castor, Aspella castor G.E. Radwin & D'Attilio, 1976 - (MURICIDAE)
- castor, Loxotomella castor Böhm, 1895 † - (MURICIDAE) (FOSSIL)
- castor, Cyrtoceras castor (Barrande, 1866 †) - (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- castor, Palaeanodonta castor (K.E.I. von Eichwald, 1860 †) - (PALAEANODONTIDAE) (FOSSIL)
- castor, Unio castor K.E.I. von Eichwald, 1860 † - syn of: Palaeanodonta castor (K.E.I. von Eichwald, 1860 †) - (UNIONIDAE) (FOSSIL)
- castor bizeti, Kosmoceras castor bizeti J.H.F. Douvillé, 1915 † - (KOSMOCERATIDAE) (FOSSIL)
- castorensis, Goniocheila castorensis (R.P. Whitfield, 1877 †) - (APORRHAIDAE) (FOSSIL)
- castoriana, Agriopoma castoriana Gardner, 1943 † - (VENERIDAE) (FOSSIL)
- castoruca, Cardites castoruca H. Adams & A. Adams, 1857 - syn of: Cardites rufa E.S.J.L. de Laborde & G.P. Deshayes, 1834 - (CARDITIDAE)
- castra, Amplirhagada castra G.A. Solem, 1981 - (CAMAENIDAE)
- castra, Strophiops castra C.J. Maynard & W.F. Clapp, 1921 - (CERIONIDAE)
- castra, Sivella castra W.H. Benson, 1852 - syn of: Videna castra (W.H. Benson, 1852) - (HELICARIONIDAE)
- castra, Helix castra W.H. Benson, 1852 - syn of: Videna castra (W.H. Benson, 1852) - (HELICIDAE)
- castra, Pseudosuccinea columella castra I. Lea - (LYMNAEIDAE)
- castra, Videna castra (W.H. Benson, 1852) - (TROCHOMORPHIDAE)
- castrana, Astarte castrana L.C. Glenn, 1904 † - (ASTARTIDAE) (FOSSIL)
- castrana, Cyclocardia castrana L.C. Glenn, 1904 † - (CARDITIDAE) (FOSSIL)
- castrenoides, Natica castrenoides W.P. Woodring, 1928 † - (NATICIDAE) (FOSSIL)
- castrensis, Drymaeus castrensis (L. Pfeiffer, 1847) - (BULIMULIDAE)
- castrensis, Polydontes castrensis (L. Pfeiffer, 1856) - (CAMAENIDAE)
- castrensis, Albinaria senilis castrensis (A. Mousson, 1859) - (CLAUSILIIDAE)
- castrensis, Conus castrensis A.A. Gould, 1842 - syn of: Virgiconus thalassiarchus (G.B. II Sowerby, 1834) - (CONIDAE)
- castrensis, Helicella castrensis E. Caziot - syn of: Helicella itala (C. Linnaeus, 1758) - (HYGROMIIDAE)
- castrensis, Melanopsis castrensis Noulet, 1854 † - (MELANOPSIDAE) (FOSSIL)
- castrensis, Natica castrensis W.H. Dall, 1889 - (NATICIDAE)
- castrensis, Acila castrensis (R.B. Hinds, 1843) - (NUCULIDAE)
- castrensis, Truncacila castrensis H.V.W. Howe, 1922 - syn of: Acila castrensis (R.B. Hinds, 1843) - (NUCULIDAE)
- castrensis, Gari castrensis (L. Spengler, 1794) - (PSAMMOBIIDAE)
- castrensis, Lioconcha castrensis (C. Linnaeus, 1758) - (VENERIDAE)
- castrensis, Tapes castrensis G.P. Deshayes, 1848 - syn of: Polititapes aureus (J.F. Gmelin, 1791) - (VENERIDAE)
- castrensis oriens, Gari castrensis oriens G.P. Deshayes, 1855 - syn of: Gari oriens (G.P. Deshayes, 1855) - (PSAMMOBIIDAE)
- castrensis perlineata, Natica castrensis perlineata W.H. Dall, 1889 - syn of: Natica perlineata W.H. Dall, 1889 - (NATICIDAE)
- castrensis texturoides, Tapes castrensis texturoides P.M. Pallary, 1912 - syn of: Polititapes aureus (J.F. Gmelin, 1791) - (VENERIDAE)
- castrepiscopalensis, Melanoides castrepiscopalensis (J. Almera, 1894 †) - (THIARIDAE) (FOSSIL)
- castriesi, Xerosecta castriesi (P.M. Pallary, 1904) - (HYGROMIIDAE)
- castriota, Candidula castriota L. Soós, 1924 - (HYGROMIIDAE)
- castroi, Hoplites castroi Kilian, 1889 † - syn of: Lopeziceras chaperi (Pictet, 1868 †) - (HOPLITIDAE) (FOSSIL)
- castroi, Hydrobia castroi É.A.A. Locard, 1899 - syn of: Peringia ulvae (T. Pennant, 1777) - (HYDROBIIDAE)
- castroi, Costatella castroi É.A.A. Locard, 1899 - syn of: Physella acuta (J.P.R. Draparnaud, 1805) - (PHYSIDAE)
- castroi, Sphaerium castroi É.A.A. Locard, 1899 - syn of: Musculium lacustre (O.F. Müller, 1774) - (SPHAERIIDAE)
- castroi, Unio castroi É.A.A. Locard, 1899 - syn of: Unio abrantesianus É.A.A. Locard, 1899 - (UNIONIDAE)
- castrovillensis, Trigonia castrovillensis L.W. Stephenson, 1941 † - (TRIGONIIDAE) (FOSSIL)
- castum, Vexillum castum (H. Adams, 1872) - (COSTELLARIIDAE)
- castum, Vexillum castum H. Adams, 1872 - syn of: Vexillum castum (H. Adams, 1872) - (COSTELLARIIDAE)
- castum, Epitonium castum (A. Adams, 1873) - (EPITONIIDAE)
- castum, Graphoceras castum (Buckman, 1901 †) - (GRAPHOCERATIDAE) (FOSSIL)
- castus, Acteon castus (R.B. Hinds, 1844) - (ACTEONIDAE)
- castus, Mesembrinus castus (L. Pfeiffer, 1847) - (BULIMULIDAE)
- castus, Chiton castus L.A. Reeve, 1847 - syn of: Ischnochiton contractus (L.A. Reeve, 1847) - (CHITONIDAE)
- castus, Conus castus L.A. Reeve, 1844 - syn of: Dauciconus daucus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- castus, Atys castus P.P. Carpenter, 1864 - (HAMINOEIDAE)
- castus, Murex castus A. Adams, 1854 - syn of: Favartia incisa (W.J. Broderip, 1833) - (MURICIDAE)
- castus, Nassarius castus Auct. non A.A. Gould, 1850 - syn of: Nassarius multivocus H.H. Kool, 2008 - (NASSARIIDAE)
- castus, Spondylus castus L.A. Reeve, 1856 - (SPONDYLIDAE)
- castus, Unio castus I. Lea, 1860 - syn of: Fusconaia masoni (T.A. Conrad, 1834) - (UNIONIDAE)
- castus porrectus, Mesembrinus castus porrectus E.C. Von Martens, 1893 - (BULIMULIDAE)
- castus vitiensis, Nassarius castus vitiensis J.B. Hombron & C.H. Jacquinot, 1848 † - syn of: Nassarius vitiensis (J.B. Hombron & C.H. Jacquinot, 1848 †) - (NASSARIIDAE) (FOSSIL)
- castus xantholeucus, Mesembrinus castus xantholeucus E.C. Von Martens, 1893 - (BULIMULIDAE)
- casus, Argobuccinum casus B.F. Kensley & Pether, 1986 † - (RANELLIDAE) (FOSSIL)
- caswelli, Phrixgnathus viridulus caswelli R.K. Dell, 1955 - (PUNCTIDAE)
- Cataceramus, Genus Cataceramus Cox, 1969 † (INOCERAMIDAE) (FOSSIL)
- catachroma, Trinchesia catachroma (R.F. Burn, 1963) - (TRINCHESIIDAE)
- cataclines, Coelocentrum cataclines F.G. Thompson, 1968 - (UROCOPTIDAE)
- Catacoeloceras, Genus Catacoeloceras Mitzopoulos, 1930 † (DACTYLIOCERATIDAE) (FOSSIL)
- catadupae, Pleurodonte catadupae H.B. Baker, 1935 - (PLEURODONTIDAE)
- catadupae, Sagda connectens catadupae H.B. Baker, 1935 - (SAGDIDAE)
- CATAEGIDAE McLean & Quinn, 1987 - Family (GASTROPODA-VETIGASTROPODA [Subclass]-SEGUENZIOIDEA [Superfamily])
- Cataegis, Genus Cataegis J.H. McLean & J.F. Quinn, 1987 (CATAEGIDAE)
- catalai, Noumea catalai W.B. Rudman, 1990 - (CHROMODORIDIDAE)
- catalanica, Kaunhowenia catalanica S. Kiel & K. Bandel, 2002 † - (APORRHAIDAE) (FOSSIL)
- catalanica, Ponsia catalanica S. Kiel & K. Bandel, 2001 † - (MATHILDIDAE) (FOSSIL)
- catalaunense, Bittium catalaunense G.P. Deshayes, 1864 † - (CERITHIIDAE) (FOSSIL)
- catalaunensis, Erycina catalaunensis A.E.M. Cossmann, 1883 † - (LASAEIDAE) (FOSSIL)
- catalaunica, Pseudotoucasia catalaunica Astre 1932 † - (REQUIENIIDAE) (FOSSIL)
- catalaunica, Melanoides catalaunica (J. Almera & Bofill y Poch, 1895 †) - (THIARIDAE) (FOSSIL)
- catalaunicum, Aspidoceras catalaunicum Loriol, 1872 † - (ASPIDOCERATIDAE) (FOSSIL)
- catalaunicus, Theodoxus crenulatus catalaunicus (J. Almera & Bofill y Poch, 1895 †) - (NERITIDAE) (FOSSIL)
- catalaunicus, Unio catalaunicus G. Coutagne, 1889 - syn of: Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- cataldi, Crepidula cataldi P. Parenzan, 1979 - (CALYPTRAEIDAE)
- Cataldia, Genus Cataldia Calzada & Corbacho, 2015 † (BATILLARIIDAE) (FOSSIL)
- cataldinii, Tubercliopsis cataldinii A. Cecalupo & I. Perugia, 2013 - (CERITHIOPSIDAE)
- catalina, Nucula catalina A.A. Olsson, 1930 † - (NUCULIDAE) (FOSSIL)
- catalinae, Epitonium catalinae W.H. Dall, 1908 - (EPITONIIDAE)
- catalinae, Lepidozona willetti catalinae G. Willett, 1937 - (ISCHNOCHITONIDAE)
- catalinae, Erycina catalinae W.H. Dall, 1916 - syn of: Lasaea adansoni W.H. Dall, 1899 - (LASAEIDAE)
- catalinae, Mitra catalinae W.H. Dall, 1919 - syn of: Mitra idae J.C. Melvill, 1893 - (MITRIDAE)
- catalinae, Triopha catalinae (J.G. Cooper, 1863) - (POLYCERIDAE)
- catalinae, Antiplanes catalinae (W.J. Raymond, 1904) - (PSEUDOMELATOMIDAE)
- catalinae, Pleurotoma catalinae W.J. Raymond, 1904 - syn of: Antiplanes catalinae (W.J. Raymond, 1904) - (TURRIDAE)
- catalinae contraria, Antiplanes catalinae contraria M. Yokoyama, 1926 - syn of: Antiplanes vinosa (W.H. Dall, 1874) - (PSEUDOMELATOMIDAE)
- catalinaria, Nearctula rowellii catalinaria (V. Sterki) - (VERTIGINIDAE)
- cataline, Orthoceras cataline Billings, 1865 † - syn of: Ectocycloceras cataline (Billings, 1865 †) - (ORTHOCERATIDAE) (FOSSIL)
- cataline, Ectocycloceras cataline (Billings, 1865 †) - (PROTOCYCLOCERATIDAE) (FOSSIL)
- catalinense, Caecum crebricinctum catalinense P. Bartsch, 1920 - (CAECIDAE)
- catalinense, Bittium catalinense P. Bartsch, 1907 - (CERITHIIDAE)
- catalinense, Epitonium catalinense W.H. Dall, 1917 - (EPITONIIDAE)
- catalinense, Haplotrema catalinense H. Hemphill, 1890 - (HAPLOTREMATIDAE)
- catalinense, Farcimen hendersoni catalinense C. de la Torre & P. Bartsch, 1942 - (MEGALOMASTOMIDAE)
- catalinense, Protancyloceras catalinense Imlay, 1942 † - (PROTANCYLOCERATIDAE) (FOSSIL)
- catalinense inornatum, Bittium catalinense inornatum P. Bartsch, 1911 - (CERITHIIDAE)
- catalinensis, Epitonium catalinensis W.H. Dall, 1917 - syn of: Epitonium catalinense W.H. Dall, 1917 - (EPITONIIDAE)
- catalinensis, Melanella catalinensis P. Bartsch, 1917 - (EULIMIDAE)
- catalinensis, Oceanida catalinensis P. Bartsch, 1920 - syn of: Pseudosabinella bakeri (P. Bartsch, 1917) - (EULIMIDAE)
- catalinensis, Helicina catalinensis L. Pfeiffer - syn of: Emoda sagraiana (A.V.M.D. D'Orbigny, 1842) - (HELICINIDAE)
- catalinensis, Alaba catalinensis P. Bartsch, 1920 - syn of: Pseudosabinella bakeri (P. Bartsch, 1917) - (LITIOPIDAE)
- catalinensis, Austrotrophon catalinensis (I.M. Oldroyd, 1927) - (MURICIDAE)
- catalinensis, Simnia catalinensis S.S. Berry, 1916 - syn of: Simnia barbarensis W.H. Dall, 1892 - (OVULIDAE)
- catalinensis, Chondrothyretes shuttleworthi catalinensis (C. de la Torre & P. Bartsch, 1938) - (POMATIIDAE)
- catalinensis, Annularita majuscula catalinensis (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- catalinensis, Cyclopecten catalinensis (G. Willett, 1931) - (PROPEAMUSSIIDAE)
- catalinensis, Pupoides catalinensis G.D. Hanna, 1923 - (PUPILLIDAE)
- catalinensis, Odostomia catalinensis P. Bartsch, 1927 - (PYRAMIDELLIDAE)
- catalinensis, Triphora catalinensis P. Bartsch, 1907 - (TRIPHORIDAE)
- catalinensis, Organocoptis catalinensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- cataliniana, Helicina cataliniana G.B. II Sowerby in L.A. Reeve, 1843 - syn of: Emoda sagraiana (A.V.M.D. D'Orbigny, 1842) - (HELICINIDAE)
- catalinitense, Chondropomium eusarcum catalinitense P. Bartsch, 1946 - (POMATIIDAE)
- catallus, Nassarius catallus (W.H. Dall, 1908) - (NASSARIIDAE)
- catalonica, Abida catalonica A. Bofill, 1890 - syn of: Abida secale affinis E.A. Rossmässler, 1839 - (CHONDRINIDAE)
- catalonica, Testacella catalonica C. Pollonera, 1888 - syn of: Testacella scutulum G.B. I Sowerby, 1821 - (TESTACELLIDAE)
- catalonicus, Potomida littoralis catalonicus (F. Haas, 1920) - (UNIONIDAE)
- Catamarcaia, Genus Catamarcaia Sanchez & Babin, 1993 (CATAMARCAIIDAE) (FOSSIL)
- CATAMARCAIIDAE Cope, 2000 † - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-ARCIDA [Order]-ARCOIDEA [Superfamily]) (FOSSIL)
- catamarcanus, Neopetraeus catamarcanus (L. Pfeiffer, 1858) - (BULIMULIDAE)
- catamarcanus, Bostryx catamarcanus J.J. Parodíz, 1956 - (BULIMULIDAE)
- catamarcanus orientalis, Neopetraeus catamarcanus orientalis A.S.H. Breure, 1978 - (BULIMULIDAE)
- catamarcensis, Pomacea catamarcensis (G.B. III Sowerby, 1875) - (AMPULLARIIDAE)
- catamayensis, Drymaeus catamayensis K. Miller, 1879 - (BULIMULIDAE)
- catamorpha, Emileia catamorpha Buckman † - (OTOITIDAE) (FOSSIL)
- catanduanica, Helicostyla imperator catanduanica O.F. von Möllendorff, 1898 - (BRADYBAENIDAE)
- catanduanica, Palaina catanduanica J.F. Quadras & O.F. von Möllendorff, 1895 - (DIPLOMMATINIDAE)
- catanesei, Architectonica catanesei E.J. Petuch, 1994 - syn of: Architectonica nobilis P.F. Röding, 1798 - (ARCHITECTONICIDAE)
- catanlilensis, Globularia catanlilensis C.S. Weaver, 1931 † - (AMPULLINIDAE) (FOSSIL)
- Catantostoma, Genus Catantostoma Sandberger, 1842 † (CATANTOSTOMATIDAE) (FOSSIL)
- CATANTOSTOMATIDAE Wenz, 1938 † - Family (GASTROPODA-VETIGASTROPODA [Subclass]-PLEUROTOMARIOIDEA [Superfamily]) (FOSSIL)
- CATANTOSTOMIDAE - syn of Family: CATANTOSTOMATIDAE (FOSSIL)
- catanuense, Epitonium catanuense (J. de C. Sowerby, 1844) - (EPITONIIDAE)
- catapasta, Etrema catapasta C. Hedley, 1922 - (CLATHURELLIDAE)
- cataphracta, Bathytoma cataphracta (G.B. Brocchi, 1814 †) - (BORSONIIDAE) (FOSSIL)
- cataphracta, Agathylla cataphracta L. Pfeiffer, 1848 - syn of: Agathylla sulcosa cataphracta (L. Pfeiffer, 1848) - (CLAUSILIIDAE)
- cataphracta, Agathylla sulcosa cataphracta (L. Pfeiffer, 1848) - (CLAUSILIIDAE)
- cataphracta, Pholidoherpia cataphracta (K.H.J. Thiele, 1913) - (HEMIMENIIDAE)
- cataphracta, Lepidomenia cataphracta (K.H.J. Thiele, 1913) - syn of: Pholidoherpia cataphracta (K.H.J. Thiele, 1913) - (LEPIDOMENIIDAE)
- cataphracta, Bullia cataphracta R.N. Kilburn, 1978 - (NASSARIIDAE)
- cataphracta dertogranosa, Bathytoma cataphracta dertogranosa F. Sacco, 1904 † - (BORSONIIDAE) (FOSSIL)
- cataphracta gedrosiana, Bathytoma cataphracta gedrosiana E.W. Vredenburg, 1925 - (BORSONIIDAE)
- cataphracta jugleri, Bathytoma cataphracta jugleri (R.A. Philippi, 1847 †) - (BORSONIIDAE) (FOSSIL)
- cataphracta mioturbida, Bathytoma cataphracta mioturbida F. Kautsky, 1925 † - (BORSONIIDAE) (FOSSIL)
- cataphractum, Delphiceras cataphractum (A.H. Clarke, 1898 †) - (GEPHUROCERATIDAE) (FOSSIL)
- cataphractus, Murex cataphractus G.B. II Sowerby, 1834 - syn of: Muricopsis cristatus (G.B. Brocchi, 1814) - (MURICIDAE)
- cataplexis, Pyrgulina cataplexis Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- Cataptychia, syn of: Genus Katoptychia Perner, 1907 † (LOXONEMATIDAE) (FOSSIL)
- Catapyrgus, Genus Catapyrgus F.M. Climo, 1974 (HYDROBIIDAE)
- cataracta, Cypricardinia cataracta T.A. Conrad † - (CYPRICARDINIIDAE) (FOSSIL)
- cataracta, Anodonta cataracta T. Say, 1817 - (UNIONIDAE)
- cataracta fragilis, Anodonta cataracta fragilis J.B.P.A. Lamarck, 1819 - syn of: Pyganodon fragilis (J.B.P.A. Lamarck, 1819) - (UNIONIDAE)
- cataractes, Euvola cataractes W.H. Dall, 1914 - syn of: Euvola vogdesi (R. Arnold, 1906) - (PECTINIDAE)
- cataractes, Sanguinolites cataractes Reed, 1944 † - (SANGUINOLITIDAE) (FOSSIL)
- catarinae, Pachydiscus catarinae (Anderson & G.D. Hanna 1935 †) - (DESMOCERATIDAE) (FOSSIL)
- catarinensis, Warthia catarinensis Rocha-Campos, 1970 † - (EUPHEMITIDAE) (FOSSIL)
- catarrhacta, Burnupena catarrhacta (J.F. Gmelin, 1791) - (BUCCINIDAE)
- catarrhacta dunkeri, Burnupena catarrhacta dunkeri (H.C. Küster, 1858) - (BUCCINIDAE)
- catarrhactae, Ruthenica filograna catarrhactae (E.A. Bielz, 1861) - (CLAUSILIIDAE)
- catasarca, Mangilia catasarca W.H. Dall, 1889 - syn of: Theta chariessa (R.B. Watson, 1881) - (MANGELIIDAE)
- catasarca, Saccella catasarca † - (NUCULANIDAE) (FOSSIL)
- catasarca, Pleurotomella catasarca W.H. Dall, 1889 - syn of: Theta chariessa (R.B. Watson, 1881) - (RAPHITOMIDAE)
- Cataschisma, Genus Cataschisma Branson , 1909 † (GOSSELETINIDAE) (FOSSIL)
- Catascopia, syn of: Subgenus Stagnicola (Ladislavella) N.D. Kruglov & Y.I. Starobogatov, 1986 (LYMNAEIDAE)
- catascopium, Stagnicola catascopium (T. Say, 1816) - (LYMNAEIDAE)
- catascopium nasoni, Stagnicola catascopium nasoni F.C. Baker, 1906 - (LYMNAEIDAE)
- catascopium niagaraensis, Stagnicola catascopium niagaraensis unknown - (LYMNAEIDAE)
- catascopium preblei, Stagnicola catascopium preblei W.H. Dall, 1905 - (LYMNAEIDAE)
- Catasigaloceras, Genus Catasigaloceras Buckman, 1923 † (KOSMOCERATIDAE) (FOSSIL)
- catastomum, Leptoconocardium catastomum (J.W. Hall, 1856 †) - (CONOCARDIIDAE) (FOSSIL)
- catastomum, Conocardium catastomum J.W. Hall, 1856 † - syn of: Leptoconocardium catastomum (J.W. Hall, 1856 †) - (CONOCARDIIDAE) (FOSSIL)
- Catastroboceras, Genus Catastroboceras Shimanskiy, 1967 † (AKTUBONAUTILIDAE) (FOSSIL)
- catathymia, Nicida catathymia E.R. Sykes, 1898 - (DIPLOMMATINIDAE)
- Cataulus, syn of: Genus Tortulosa J.E. Gray, 1847 (PUPINIDAE)
- catawbensis, Unio catawbensis I. Lea, 1862 - syn of: Unio abbevillensis I. Lea, 1857 - (UNIONIDAE)
- Catazona, Genus Catazona Gordon & Yochelson, 1983 † (PHYMATOPLEURIDAE) (FOSSIL)
- Catazone, Genus Catazone Perner, 1907 † (MURCHISONIIDAE) (FOSSIL)
- catedralis, Anchura catedralis von der Osten, 1957 † - (APORRHAIDAE) (FOSSIL)
- catei, Zoila catei F.A. Schilder, 1963 - syn of: Zoila venusta (G.B. II Sowerby, 1847) - (CYPRAEIDAE)
- catei, Trivellona catei D. Fehse & J. Grego, 2004 - (TRIVIIDAE)
- catelini, Pusionella catelini S.A.A. Petit De La Saussaye, 1851 - syn of: Perrona aculeiformis (J.B.P.A. Lamarck, 1816) - (CLAVATULIDAE)
- Catella, Genus Catella Healey, 1908 † (PARALLELODONTIDAE) (FOSSIL)
- catella, Serpulorbis catella N.E. Weisbord, 1962 - (VERMETIDAE)
- catellanosae, Heleobia catellanosae J.M. Gaillard, 1974 - syn of: Heleobia castellanosae J.M. Gaillard, 1974 - (COCHLIOPIDAE)
- catelliformis, Antonella catelliformis Astafieva-Urbajtis & Ramovs, 1985 † - (PARALLELODONTIDAE) (FOSSIL)
- Catellotrachia, syn of: Genus Semotrachia T. Iredale, 1933 (CAMAENIDAE)
- Catelysia, syn of: Genus Katelysia A. Römer, 1857 (VENERIDAE)
- catemacensis, Pomacea patula catemacensis (H.B. Baker, 1922) - (AMPULLARIIDAE)
- catena, Turricula catena (L.A. Reeve, 1843) - (CLAVATULIDAE)
- catena, Apispiralia catena C.F. Laseron, 1954 - (MANGELIIDAE)
- catena, Euspira catena (E.M. Da Costa, 1778) - (NATICIDAE)
- catena, Philine catena (G. Montagu, 1803) - (PHILINIDAE)
- catena, Phyllidiella catena A. Pruvot-Fol, 1956 - syn of: Phyllidiella zeylanica (E.F. Kelaart, 1859) - (PHYLLIDIIDAE)
- catena, Succinea catena G.C. Spence, 1925 - (SUCCINEIDAE)
- catena, Pleurotoma catena L.A. Reeve, 1843 - syn of: Turricula catena (L.A. Reeve, 1843) - (TURRIDAE)
- catena ampullinoides, Natica catena ampullinoides F. Sacco, 1890 † - syn of: Pliconacca plicatulaeformis (E.A.L. Kittl, 1887 †) - (NATICIDAE) (FOSSIL)
- catena conico, Natica catena conico J.G. Jeffreys, 1867 - syn of: Euspira catena (E.M. Da Costa, 1778) - (NATICIDAE)
- catena hemiclausa, Euspira catena hemiclausa (Sowerby, 1824 †) - (NATICIDAE) (FOSSIL)
- catena protracta, Euspira catena protracta (K.E.I. von Eichwald, 1830 †) - (NATICIDAE) (FOSSIL)
- catena zona, Philine catena zona T.A. de M. Monterosato - (PHILINIDAE)
- catena zona, Philine catena zona J.G. Jeffreys, 1867 - syn of: Philine catena (G. Montagu, 1803) - (PHILINIDAE)
- catenae, Drymaeus catenae F. Haas, 1952 - (BULIMULIDAE)
- catenaria, Cerithiopsis catenaria J.C. Melvill & R. Standen, 1896 - (CERITHIOPSIDAE)
- catenaria, Goniobasis catenaria (T. Say, 1822) - (PLEUROCERIDAE)
- catenaria dislocata, Goniobasis catenaria dislocata (E. Ravenel, 1834) - (PLEUROCERIDAE)
- catenaria effosa, Goniobasis catenaria effosa M. Smith, 1938 - (PLEUROCERIDAE)
- catenaria inclinans, Goniobasis catenaria inclinans I. Lea, 1862 - (PLEUROCERIDAE)
- catenaria postelli, Goniobasis catenaria postelli I. Lea, 1858 - syn of: Goniobasis postelli (I. Lea, 1858) - (PLEUROCERIDAE)
- catenaria vanhyningiana, Goniobasis catenaria vanhyningiana C. Goodrich, 1921 - (PLEUROCERIDAE)
- catenata, Turricula catenata G.P. Deshayes, 1865 † - (CLAVATULIDAE) (FOSSIL)
- catenata, Anachis catenata (G.B. I Sowerby, 1844) - (COLUMBELLIDAE)
- catenata, Columbella catenata G.W. Tryon, 1883 - syn of: Costoanachis scutulata (L.A. Reeve, 1859) - (COLUMBELLIDAE)
- catenata, Gibberula catenata (G. Montagu, 1803) - (CYSTISCIDAE)
- catenata, Elachisina catenata E. Rolán & S. Gofas, 2003 - (ELACHISINIDAE)
- catenata, Limopsis catenata H.H. Suter, 1917 † - syn of: Limopsis zitteli H.F.A. von Ihering, 1907 † - (LIMOPSIDAE) (FOSSIL)
- catenata, Natica catenata R.A. Philippi, 1853 - syn of: Natica grayi R.A. Philippi, 1852 - (NATICIDAE)
- catenata, Natica catenata R.A. Philippi, 1853 - syn of: Natica grayi R.A. Philippi, 1852 - (NATICIDAE)
- catenata, Natica catenata É.A.A. Locard, 1886 - syn of: Euspira catena (E.M. Da Costa, 1778) - (NATICIDAE)
- catenata, Philine catenata É.A.A. Locard, 1886 - syn of: Philine catena (G. Montagu, 1803) - (PHILINIDAE)
- catenata, Philine catenata C. Thorpe, 1844 - syn of: Philine catena (G. Montagu, 1803) - (PHILINIDAE)
- catenata, Pleurotomaria catenata de Koninck, 1844 † - syn of: Polytremaria catenata (de Koninck, 1844 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- catenata, Polytremaria catenata (de Koninck, 1844 †) - (POLYTREMARIIDAE) (FOSSIL)
- catenata, Eutudora catenata (A.A. Gould, 1843) - (POMATIIDAE)
- catenata, Peteniella catenata (L. Pfeiffer, 1856) - (SPIRAXIDAE)
- catenata, Voluta catenata G. Montagu, 1803 - syn of: Gibberula catenata (G. Montagu, 1803) - (VOLUTIDAE)
- catenata blanesi, Eutudora catenata blanesi (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- catenata pipianensis, Eutudora catenata pipianensis C.G. Aguayo & M.L. Jaume, 1954 - (POMATIIDAE)
- catenatatus, Potamides cristatus catenatatus G.P. Deshayes, 1833 † - (POTAMIDIDAE) (FOSSIL)
- catenatum, Vexillum catenatum (W.J. Broderip, 1836) - (COSTELLARIIDAE)
- catenatum, Pseudohelicoceras catenatum (A.V.M.D. D'Orbigny, 1842 †) - (TURRILITIDAE) (FOSSIL)
- catenatum smithi, Pusia catenatum smithi G.B. III Sowerby, 1889 - syn of: Vexillum smithi (G.B. III Sowerby, 1889) - (COSTELLARIIDAE)
- catenatus, Conus catenatus G.B. III Sowerby, 1879 - syn of: Tenorioconus granarius (L.C. Kiener, 1845) - (CONIDAE)
- catenatus, Catenohalorites catenatus (von Buch, 1833 †) - (HALORITIDAE) (FOSSIL)
- catenatus, Prodrepanites catenatus Tozer, 1994 † - (TIBETITIDAE) (FOSSIL)
- catenatus, Jujubinus catenatus R. Ardovini, 2006 - (TROCHIDAE)
- catenatus, Macroceramus catenatus J. Gundlach in L. Pfeiffer, 1859 - (UROCOPTIDAE)
- catenifera, Psadara catenifera (L. Pfeiffer, 1852) - (PLEURODONTIDAE)
- catenifera, Monodonta catenifera V.L.V. Potiez & A. Michaud, 1838 † - syn of: Cantallocostoma quadricostatum (Wood, 1828 †) - (TROCHIDAE) (FOSSIL)
- catenifera, Venus catenifera J.B.P.A. Lamarck, 1818 - syn of: Polititapes aureus (J.F. Gmelin, 1791) - (VENERIDAE)
- Catenohalorites, Genus Catenohalorites Tatzreiter , 1980 † (HALORITIDAE) (FOSSIL)
- catenoides, Polinices catenoides W.L. May, 1919 - (NATICIDAE)
- catenoides, Euspira catenoides (Wood, 1842 †) - (NATICIDAE) (FOSSIL)
- catenoides, Natica catenoides Wood, 1842 † - syn of: Euspira catenoides (Wood, 1842 †) - (NATICIDAE) (FOSSIL)
- catenoides, Elimia catenoides (I. Lea, 1842) - (PLEUROCERIDAE)
- catenoides, Skenea catenoides (T.A. de M. Monterosato, 1877) - (SKENEIDAE)
- Catenoscala, syn of: Genus Epitonium P.F. Röding, 1798 (EPITONIIDAE)
- Catenotoma, Subgenus Turricula (Catenotoma) A.E.M. Cossmann, 1900 † (CLAVATULIDAE) (FOSSIL)
- catenularia, Grandostoma catenularia J. Perner, 1903 † - syn of: Grandostoma bohemica (J. Perner, 1903 †) - (BUCANIIDAE) (FOSSIL)
- catenularia, Carinaropsis catenularia J. Perner, 1903 † - syn of: Grandostoma bohemica (J. Perner, 1903 †) - (PTEROTHECIDAE) (FOSSIL)
- catenulata, Andronakia catenulata W.A. Lindholm, 1913 - (ENIDAE)
- catenulata, Villmaria catenulata (d'Archiac & de Verneuil, 1842 †) - (GOSSELETINIDAE) (FOSSIL)
- catenulata, Ocythoe catenulata R.A. Philippi, 1844 - syn of: Ocythoe tuberculata C.S. Rafinesque, 1814 - (OCYTHOIDAE)
- catenulatus, Heliacus catenulatus A. da Costa, 1869 - (ARCHITECTONICIDAE)
- catenulatus, Conus catenulatus J. de C. Sowerby, 1840 † - syn of: Lithoconus brevis (J. de C. Sowerby, 1840 †) - (CONIDAE) (FOSSIL)
- catenulatus, Ischnochiton catenulatus G.B. I Sowerby, 1832 - syn of: Chaetopleura lurida (G.B. I Sowerby in W.J. Broderip & G.B. I Sowerby, 1832) - (ISCHNOCHITONIDAE)
- catenulatus, Trochomodulus catenulatus (R.A. Philippi, 1849) - (MODULIDAE)
- catenulatus, Octopus catenulatus R.A. Philippi, 1844 - syn of: Ocythoe tuberculata C.S. Rafinesque, 1814 - (OCTOPODIDAE)
- catenulifera, Philine catenulifera W. Macgillivray, 1843 - syn of: Philine scabra (O.F. Müller, 1784) - (PHILINIDAE)
- caterinae, Cerithiopsidella caterinae A. Cecalupo & I. Perugia, 2014 - (CERITHIOPSIDAE)
- caterinae, Marginella caterinae L. Bozzetti, 1991 - (MARGINELLIDAE)
- caterinii, Hildoceras caterinii Merla, 1933 † - (HILDOCERATIDAE) (FOSSIL)
- caterinii, Malletia caterinii (Appelius 1873) † - (MALLETIIDAE) (FOSSIL)
- catesbyana, Schwartziella catesbyana (A.V.M.D. D'Orbigny, 1842) - (ZEBINIDAE)
- catescopium, Lymnaea catescopium T. Say, 1867 - syn of: Stagnicola catascopium (T. Say, 1816) - (LYMNAEIDAE)
- cateucta, Hemicycla cateucta J.F. Mabille, 1883 - syn of: Hemicycla psathyra temperata (A. Mousson, 1872) - (HELICIDAE)
- cathaiana, Macrochlamys cathaiana O.F. von Möllendorff, 1899 - (ARIOPHANTIDAE)
- Cathaica, Genus Cathaica O.F. von Möllendorff, 1884 (BRADYBAENIDAE)
- cathaicola, Arinia cathaicola H.A. Pilsbry, 1934 - (DIPLOMMATINIDAE)
- cathara, Albinaria nivea cathara (C.A. Westerlund, 1894) - (CLAUSILIIDAE)
- Catharella, syn of: Genus Albinaria W. von Vest, 1867 (CLAUSILIIDAE)
- catharia, Limicolaria martensiana catharia W.H. Dall, 1910 - (ACHATINIDAE)
- catharia, Carditamera catharia W.H. Dall, 1903 † - (CARDITIDAE) (FOSSIL)
- catharia, Kermia catharia (J.C. Melvill, 1917) - (RAPHITOMIDAE)
- catharia, Volvulella catharia W.H. Dall, 1919 - (RHIZORIDAE)
- catharia, Agriopoma catharia (W.H. Dall, 1902) - (VENERIDAE)
- catharia, Callocardia catharia W.H. Dall, 1902 - syn of: Agriopoma catharia (W.H. Dall, 1902) - (VENERIDAE)
- cathariium, Agriopoma cathariium W.H. Dall, 1902 - syn of: Agriopoma catharia (W.H. Dall, 1902) - (VENERIDAE)
- catharina, Donaldiella catharina (Billings, 1865 †) - (LOPHOSPIRIDAE) (FOSSIL)
- catharina, Chondrothyra cumbrensis catharina C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- catharinae, Bulimus catharinae L. Pfeiffer, 1857 - syn of: Cyclodontina fusiformis (K.T. Menke, 1828) - (BULIMULIDAE)
- catharinae, Heteropecten catharinae (Reed, 1930 †) - (HETEROPECTINIDAE) (FOSSIL)
- catharinae, Potamolithus catharinae H.A. Pilsbry, 1911 - (LITHOGLYPHIDAE)
- catharinae, Cyclodontina catharinae (L. Pfeiffer, 1856) - (ODONTOSTOMIDAE)
- catharinae, Famelica catharinae (A.E. Verrill & S. Smith in A.E. Verrill, 1884) - (RAPHITOMIDAE)
- catharinae, Pleurotomella catharinae A.E. Verrill & S. Smith in A.E. Verrill, 1884 - (RAPHITOMIDAE)
- catharinae, Ethalia catharinae G.T. Poppe, S.P. Tagaro & H. Dekker, 2006 - (TROCHIDAE)
- catharinae, Pleurotoma catharinae A.E. Verrill & S. Smith, 1884 - syn of: Famelica catharinae (A.E. Verrill & S. Smith in A.E. Verrill, 1884) - (TURRIDAE)
- cathartensis, Eutrochatella pulchella cathartensis H.B. Baker, 1934 - (HELICINIDAE)
- catharus, Cadulus catharus J. Henderson, 1920 - (GADILIDAE)
- cathayensis, Cipangopaludina cathayensis (P.M. Heude, 1890) - (VIVIPARIDAE)
- cathaysiae, Tiberia cathaysiae E. Saurin, 1959 - (PYRAMIDELLIDAE)
- cathcartiae, Plekocheilus cathcartiae (L.A. Reeve, 1848) - (AMPHIBULIMIDAE)
- cathcartiae, Bulimus cathcartiae L.A. Reeve, 1848 - syn of: Plekocheilus cathcartiae (L.A. Reeve, 1848) - (BULIMULIDAE)
- cathcartiae, Cymbiola cathcartiae L.A. Reeve, 1856 - (VOLUTIDAE)
- cathedralis, Cochlespira cathedralis W.H. Dall, 1878 - syn of: Cochlespira elegans (W.H. Dall, 1881) - (COCHLESPIRIDAE)
- cathedralis, Protoma cathedralis (A. Brongniart, 1856 †) - (TURRITELLIDAE) (FOSSIL)
- cathedralis, Turritella cathedralis A. Brongniart, 1823 † - syn of: Protoma cathedralis (A. Brongniart, 1856 †) - (TURRITELLIDAE) (FOSSIL)
- cathedralis, Notovoluta cathedralis (R. Tate, 1888 †) - (VOLUTIDAE) (FOSSIL)
- cathedralis paucicincta, Protoma cathedralis paucicincta F. Sacco, 1894 † - (TURRITELLIDAE) (FOSSIL)
- catherina, Gyliotrachela catherina G.A. Solem, 1981 - syn of: Gyliotrachela australis (N.H. Odhner, 1917) - (HYPSELOSTOMATIDAE)
- catherina, Chlamys catherina (Cragin, 1893 †) - (PECTINIDAE) (FOSSIL)
- catherina, Compsodrillia catherina W.P. Woodring, 1928 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- catherinae, Geinitzia catherinae C. Gemmellaro 1896 † - (BIVALVIA INCERTAE SEDIS) (FOSSIL)
- catherinae, Muffinbuccinum catherinae M.G. Harasewych & Y.I. Kantor, 2004 - (BUCCINIDAE)
- catherinae, Xeromelon catherinae F. Criscione & F. Köhler, 2016 - (CAMAENIDAE)
- catherinae, Ctenoides catherinae R. von Cosel, 1995 - (LIMIDAE)
- catherinae, Luciella catherinae C. Gemmellaro, 1889 † - (LUCIELLIDAE) (FOSSIL)
- catherinae, Nuculites catherinae C. Gemmellaro 1896 † - (MALLETIIDAE) (FOSSIL)
- catherinae, Nordophiceratoides catherinae Guex & al., 2005 † - (NORDOPHICERATIDAE) (FOSSIL)
- catherinae, Pleurobranchaea catherinae B. Dayrat, 2001 - (PLEUROBRANCHAEIDAE)
- catherinae, Pleurotomaria catherinae C. Gemmellaro, 1889 † - (PLEUROTOMARIIDAE) (FOSSIL)
- catherinae, Cochliolepis catherinae K.H. Barnard, 1958 - (TORNIDAE)
- catherwoodianum, Cerion catherwoodianum C.B. Wurtz, 1950 - (CERIONIDAE)
- cathleenae, Cardavia cathleenae Kríž, 2005 † - (CARDIOLIDAE) (FOSSIL)
- cathleenae, Cardavia cathleenae Kriz 2005 † - (CARDIOLIDAE) (FOSSIL)
- catholica, Rissoina catholica J.C. Melvill & R. Standen, 1896 - (RISSOINIDAE)
- catholicorum, Cribrarula catholicorum (F.A. Schilder & M. Schilder, 1938) - (CYPRAEIDAE)
- catholicorum, Cypraea catholicorum F.A. Schilder & M. Schilder, 1938 - syn of: Cribrarula catholicorum (F.A. Schilder & M. Schilder, 1938) - (CYPRAEIDAE)
- cathyae, Pseudozonaria cathyae Groves, 1997 † - (CYPRAEIDAE) (FOSSIL)
- cathyae, Alvania cathyae Landau, Marquet & Grigis, 2003 † - (RISSOIDAE) (FOSSIL)
- catiana, Luria catiana N.E. Weisbord, 1962 - syn of: Luria cinerea (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- catilla, Diodora catilla L.A. Reeve, 1850 - (FISSURELLIDAE)
- catilliformis, Euomphalus catilliformis de Koninck, 1881 † - (EUOMPHALIDAE) (FOSSIL)
- catilliformis, Mactromeris catilliformis (T.A. Conrad, 1867) - (MACTRIDAE)
- Catillina, syn of: Genus Crucibulum H.C.F. Schumacher, 1817 (CALYPTRAEIDAE)
- catilllus, Pleurobema cordatum catilllus T.A. Conrad, 1836 - (UNIONIDAE)
- catilloides, Joleaudella catilloides (W.J. Raymond, 1906 †) - (BELLEROPHONTIDAE) (FOSSIL)
- catilloides, Bucania catilloides W.J. Raymond, 1906 † - syn of: Joleaudella argo (Billings, 1860 †) - (BUCANIIDAE) (FOSSIL)
- catilloides, Amphiscapha catilloides (T.A. Conrad, 1842 †) - (EUOMPHALIDAE) (FOSSIL)
- catilloides, Schizostoma catilloides T.A. Conrad, 1842 † - syn of: Amphiscapha catilloides (T.A. Conrad, 1842 †) - (EUOMPHALIDAE) (FOSSIL)
- Catillon, syn of: Genus Nassarius Duméril, 1805 (NASSARIIDAE)
- Catillopecten, Genus Catillopecten T. Iredale, 1939 (PROPEAMUSSIIDAE)
- catillum, Gafrarium catillum C. Hedley, 1909 - (VENERIDAE)
- catillus, Euomphalus catillus (Martin, 1793 †) - (EUOMPHALIDAE) (FOSSIL)
- catillus, Schizostoma catillus Martin, 1793 † - syn of: Euomphalus catillus (Martin, 1793 †) - (EUOMPHALIDAE) (FOSSIL)
- catillus, Neilonella catillus P.A. Maxwell, 1988 † - (NEILONELLIDAE) (FOSSIL)
- Catillus, syn of: Genus Septaria A.E.J. Férussac, 1807 (NERITIDAE)
- Catillus, syn of: Genus Septaria A.E.J. Férussac, 1807 (NERITIDAE)
- catillus, Dombarocanites catillus Ruzhentsev & Bogoslovskaya, 1971 † - (PROLECANITIDAE) (FOSSIL)
- catillus, Parvamussium catillus H.H. Dijkstra & P. Maestrati, 2015 - (PROPEAMUSSIIDAE)
- Catilon, Genus Catilon Addicot, 1965 † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- catina, Austraeolis catina Er. Marcus & Ev. Marcus, 1967 - (FACELINIDAE)
- catina, Philine catina T. Brown, 1827 - syn of: Philine catena (G. Montagu, 1803) - (PHILINIDAE)
- catina, Trivirostra catina Fehse, 2017 - (TRIVIIDAE)
- catinati, Cossmannica catinati E. Saurin, 1959 - (PYRAMIDELLIDAE)
- Catinella, Genus Catinella W.H. Pease, 1870 (SUCCINEIDAE)
- Catinula, Subgenus Gryphaea (Catinula) Rollier, 1911 † (GRYPHAEIDAE) (FOSSIL)
- catinus, Pratulum catinus (P.A. Maxwell, 1992 †) - (CARDIIDAE) (FOSSIL)
- Catinus, syn of: Genus Sinum P.F. Röding, 1798 (NATICIDAE)
- catinus, Fagesia catinus (Mantell, 1822 †) - (VASCOCERATIDAE) (FOSSIL)
- cativa, Axelella cativa B.M. Landau & al., 2012 † - (CANCELLARIIDAE) (FOSSIL)
- cativara, Euphaedusa cativara P.M. Heude, 1885 - (CLAUSILIIDAE)
- catletti, Helicarion catletti J.W. Brazier, 1872 - (HELICARIONIDAE)
- catlinensis, Belemnites catlinensis J. Hector, 1878 † - syn of: Hibolithes catlinensis (J. Hector, 1878 †) - (BELEMNITELLIDAE) (FOSSIL)
- catlinensis, Hibolithes catlinensis (J. Hector, 1878 †) - (MESOHIBOLITHIDAE) (FOSSIL)
- catlowae, Bulimulus catlowae L. Pfeiffer, 1853 - syn of: Naesiotus catlowiae L. Pfeiffer, 1853 - (BULIMULIDAE)
- catlowae, Corbula catlowae L.A. Reeve, 1844 - syn of: Corbula zelandica J.R.C. Quoy & J.P. Gaimard, 1835 - (CORBULIDAE)
- catlowiae, Naesiotus catlowiae L. Pfeiffer, 1853 - (BULIMULIDAE)
- cato, Orthoceras cato Billings, 1865 † - syn of: Ectocycloceras cato (Billings, 1865 †) - (ORTHOCERATIDAE) (FOSSIL)
- cato, Ectocycloceras cato (Billings, 1865 †) - (PROTOCYCLOCERATIDAE) (FOSSIL)
- catochense, Prunum catochense T. Cossignani, 2004 - (MARGINELLIDAE)
- catocyphia, Theba catocyphia J.R. Bourguignat, 1860 - syn of: Theba pisana (O.F. Müller, 1774) - (HELICIDAE)
- catocyrta, Ganesella catocyrta (J.F. Quadras & O.F. von Möllendorff, 1895) - (CAMAENIDAE)
- catocyrta, Anodonta catocyrta É.A.A. Locard, 1890 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- catomus, Glacidorbis catomus W.F. Ponder & G.J. Avern, 2000 - (GLACIDORBIDAE)
- catonense, Rayonnoceras catonense J.S. Turner, 1951 † - (CARBACTINOCERATIDAE) (FOSSIL)
- catonii, Notomyrtea catonii Glover & J.D. Taylor, 2016 - (LUCINIDAE)
- catonis, Ophionautilus catonis (C. Gemmellaro, 1886 †) - (CENOCERATIDAE) (FOSSIL)
- catonis, Nautilus catonis C. Gemmellaro, 1886 † - syn of: Ophionautilus catonis (C. Gemmellaro, 1886 †) - (NAUTILIDAE) (FOSSIL)
- Catoraphiceras, Genus Catoraphiceras Ulrich & Foerste, 1936 † (PROTOCYCLOCERATIDAE) (FOSSIL)
- Catoraphinoceras, Genus Catoraphinoceras Ulrich & Foerste, 1936 † (PROTOCYCLOCERATIDAE) (FOSSIL)
- catorceana, Holospira catorceana H.A. Pilsbry, 1953 - (UROCOPTIDAE)
- catostoma, Cadoceras catostoma (Pompeckj, 1900 †) - (CADOCERATIDAE) (FOSSIL)
- Catriceras, Genus Catriceras Venturi , 1978 † (POLYMORPHITIDAE) (FOSSIL)
- catriense, Catriceras catriense Venturi, 1978 † - (POLYMORPHITIDAE) (FOSSIL)
- catriensis, Lytoceras catriensis Meneghini, 1881 † - syn of: Alocolytoceras ophioneum (Benecke, 1865 †) - (LYTOCERATIDAE) (FOSSIL)
- Catriona, Genus Catriona R. Winckworth, 1941 (TRINCHESIIDAE)
- catskillensis, Amnigenia catskillensis (Vanuxem, 1842 †) - (AMNIGENIIDAE) (FOSSIL)
- catskillensis, Discus catskillensis H.A. Pilsbry, 1896 - (DISCIDAE)
- catskillensis, Cypricardites catskillensis Vanuxem, 1842 † - syn of: Amnigenia catskillensis (Vanuxem, 1842 †) - (KALENTERIDAE) (FOSSIL)
- Cattania, Genus Cattania Brusina, 1904 (HELICIDAE)
- cattaniana, Donax cattaniana Š. Brusina, 1866 - syn of: Donax venustus G.S. Poli, 1795 - (DONACIDAE)
- Cattaniella, syn of: Genus Cattania Brusina, 1904 (HELICIDAE)
- cattaroensis, Montenegrina cattaroensis (E.A. Rossmässler, 1835) - (CLAUSILIIDAE)
- cattaroensis, Hydrobia cattaroensis (C.A. Westerlund, 1886) - (HYDROBIIDAE)
- cattaroensis, Hydrocena cattaroensis (L. Pfeiffer, 1841) - (HYDROCENIDAE)
- cattaroensis antivaricostata, Montenegrina cattaroensis antivaricostata Z. Fehér & M. Szekeres, 2016 - (CLAUSILIIDAE)
- cattaroensis umbilicata, Montenegrina cattaroensis umbilicata (O. Boettger, 1879) - (CLAUSILIIDAE)
- catticum, Cerithium catticum Speyer, 1867 † - syn of: Cerithium pseudoobeliscus (J.P.S. Grateloup, 1832 †) - (CERITHIIDAE) (FOSSIL)
- catulli, Natica catulli Klipstein, 1843 † - (NATICIDAE) (FOSSIL)
- Catulloceras, Genus Catulloceras Tholliere, 1874 † (HILDOCERATIDAE) (FOSSIL)
- catulloi, Pseudothurmannia catulloi (C.F. Parona, 1898 †) - (CRIOCERATITIDAE) (FOSSIL)
- catulloi, Olcostephanus catulloi Rodighiero, 1919 † - (OLCOSTEPHANIDAE) (FOSSIL)
- catulus, Cypraea pantherina catulus F.A. Schilder, 1924 - (CYPRAEIDAE)
- catulus, Orthoceras catulus Billings, 1865 † - syn of: Protocycloceras catulus (Billings, 1865 †) - (ORTHOCERATIDAE) (FOSSIL)
- catulus, Elysia catulus (A.A. Gould, 1870) - (PLAKOBRANCHIDAE)
- catulus, Protocycloceras catulus (Billings, 1865 †) - (PROTOCYCLOCERATIDAE) (FOSSIL)
- caturigium, Ferussacia caturigium J.P.R. Draparnaud, 1805 - syn of: Ferussacia folliculus (J.S. Schröter, 1784) - (FERUSSACIIDAE)
- catus, Pionoconus catus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- catus fuscoolivaceus, Conus catus fuscoolivaceus P. Dautzenberg, 1937 - syn of: Pionoconus catus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- catus granulata, Conus catus granulata E. Wils, 1971 - syn of: Pionoconus catus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- catus granulosa, Conus catus granulosa P. Dautzenberg, 1937 - syn of: Puncticulis arenatus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- catus nigropunctatus, Chelyconus catus nigropunctatus G.B. II Sowerby, 1857 - syn of: Pionoconus nigropunctatus (G.B. II Sowerby, 1858) - (CONIDAE)
- catus pullulus, Pionoconus catus pullulus L. Bozzetti, 2017 - syn of: Pionoconus catus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- catus rubrapapillosa, Conus catus rubrapapillosa P. Dautzenberg, 1937 - syn of: Pionoconus catus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- catus vezorum, Pionoconus catus vezorum L. Bozzetti, 2017 - (CONIDAE)
- catutosense, Djurjuriceras catutosense H.A. Leanza & al., 1990 † - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- Catutosphinctes, Genus Catutosphinctes Leanza & Zeiss, 1992 † (ATAXIOCERATIDAE) (FOSSIL)
- Catyrephoceras, Genus Catyrephoceras Foerste, 1926 † (LECHRITROCHOCERATIDAE) (FOSSIL)
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