- Clea, Genus Clea H. Adams, 1855 (BUCCINIDAE)
- clealandi, Tectura clealandi G.B. I Sowerby, 1822 - syn of: Testudinalia testudinalis (Müller, 1776) - (LOTTIIDAE)
- clealandi, Patella clealandi J. Fleming, 1828 - syn of: Testudinalia testudinalis (Müller, 1776) - (PATELLIDAE)
- clealandiana, Turritella clealandiana W.E. Leach in J.E. Gray, 1852 - syn of: Graphis albida (F. Kanmacher, 1798) - (TURRITELLIDAE)
- cleamesi, Kalidos cleamesi (E.A. Smith, 1882) - (ARIOPHANTIDAE)
- Cleanthus, syn of: Genus Berthella H.M.D. De Blainville, 1824 (PLEUROBRANCHIDAE)
- clearete, Syrnola clearete J.C. Melvill, 1910 - (PYRAMIDELLIDAE)
- clearyensis, Eulimella clearyensis McNeil, 1984 † - (PYRAMIDELLIDAE) (FOSSIL)
- clearyensis, Terebra divisura clearyensis McNeil, 1984 † - (TEREBRIDAE) (FOSSIL)
- cleaveri, Pellasimnia cleaveri F.Jr. Lorenz & D. Fehse, 2009 - (OVULIDAE)
- cleaveri, Lyria cleaveri H. Morrison, 2008 - (VOLUTIDAE)
- Cleba, syn of: Genus Gleba P. Forsskål, 1776 (CYMBULIIDAE)
- cledonida, Columbella cledonida P.L. Duclos, 1846 - (COLUMBELLIDAE)
- cleefi, Drymaeus cleefi A.S.H. Breure & A. Eskens, 1981 - syn of: Stenostylus nigrolimbatus (L. Pfeiffer, 1853) - (BULIMULIDAE)
- cleeforum, Plekocheilus cleeforum A.S.H. Breure, 1978 - (AMPHIBULIMIDAE)
- cleicecabrale, Lacuna cleicecabrale F.N. Barros, 1994 - (LITTORINIDAE)
- Cleidochondrella, Genus Cleidochondrella Freneix & Lefevre, 1967 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- Cleidophorus, syn of: Genus Nuculites Conrad, 1841 † (MALLETIIDAE) (FOSSIL)
- CLEIDOTHAERIDAE Hedley, 1918 (1870) - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-ANOMALODESMATA [Order]-MYOCHAMOIDEA [Superfamily])
- Cleidothaerus, Genus Cleidothaerus S. Stutchbury, 1830 (CLEIDOTHAERIDAE)
- Cleiochondrella, Genus Cleiochondrella Freneix & Lafevre, 1967 † (CHONDRODONTIDAE) (FOSSIL)
- Cleionychia, Genus Cleionychia Ulrich, 1892 † (AMBONYCHIIDAE) (FOSSIL)
- cleistopsila, Polinices cleistopsila K.H. Barnard, 1963 - (NATICIDAE)
- Cleistosphinctes, Subgenus Leptosphinctes (Cleistosphinctes) Parona, 1896 † (PERISPHINCTIDAE) (FOSSIL)
- cleistus, Cleistosphinctes cleistus Buckman, 1920 † - (PERISPHINCTIDAE) (FOSSIL)
- Clelandella, Genus Clelandella R. Winckworth, 1932 (TROCHIDAE)
- clelandi, Bassleroceras clelandi Ulrich & al., 1944 † - syn of: Ectenolites clelandi (Ulrich & al., 1944 †) - (BASSLEROCERATIDAE) (FOSSIL)
- clelandi, Cominella clelandi R. Tate, 1888 † - (BUCCINIDAE) (FOSSIL)
- clelandi, Calliostoma clelandi W. Wood, 1828 - syn of: Clelandella miliaris (G.B. Brocchi, 1814) - (CALLIOSTOMATIDAE)
- clelandi, Ectenolites clelandi (Ulrich & al., 1944 †) - (ELLESMEROCERATIDAE) (FOSSIL)
- clelandi, Wisconsinella clelandi Blodgett, 1988 † - (GOSSELETINIDAE) (FOSSIL)
- clelandi, Clelandella clelandi W. Wood, 1828 - syn of: Clelandella miliaris (G.B. Brocchi, 1814) - (TROCHIDAE)
- Clelandoceras, Genus Clelandoceras Ulrich & al., 1944 † (ELLESMEROCERATIDAE) (FOSSIL)
- cleliae, Zilchogyra cleliae W.K. Weyrauch, 1965 - syn of: Radiodiscus pilsbryi M.I. Hylton-Scott, 1957 - (HELICODISCIDAE)
- clellandi, Arca clellandi E. Forbes, 1846 † - (ARCIDAE) (FOSSIL)
- clemam, Eulimella clemam A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- clemenceae, Bolma clemenceae L. Bozzetti, 2010 - syn of: Bolma recens (R.K. Dell, 1967) - (TURBINIDAE)
- clemens, Mastonia clemens (R.B. Hinds, 1843) - (TRIPHORIDAE)
- clemensi, Taia clemensi (P. Bartsch, 1907) - (VIVIPARIDAE)
- clementensis, Mitrella clementensis (P. Bartsch, 1927) - (COLUMBELLIDAE)
- clementensis, Euspira clementensis G.D. Hanna, 1927 † - (NATICIDAE) (FOSSIL)
- clementensis, Paralepetopsis clementensis J.H. McLean, 2008 - (NEOLEPETOPSIDAE)
- clementensis, Odostomia clementensis P. Bartsch, 1927 - (PYRAMIDELLIDAE)
- clementia, Crassinella clementia H.A. Pilsbry & A.A. Olsson, 1941 - syn of: Crassinella nuculiformis S.S. Berry, 1940 - (CRASSATELLIDAE)
- Clementia, Genus Clementia J.E. Gray, 1842 (VENERIDAE)
- clementianum, Eutrephoceras clementianum d'Orbigny, 1840 † - syn of: Eutrephoceras clementinum (A.V.M.D. D'Orbigny, 1840 †) - (NAUTILIDAE) (FOSSIL)
- clementina, Ampullospira clementina (A.V.M.D. D'Orbigny, 1842 †) - (AMPULLINIDAE) (FOSSIL)
- clementina, Melanopsis clementina J.L.H. Michelin, 1833 † - (MELANOPSIDAE) (FOSSIL)
- clementina, Mysella clementina (P.P. Carpenter, 1857) - (MONTACUTIDAE)
- clementina, Natica clementina d'Orbigny, 1842 † - syn of: Ampullospira clementina (A.V.M.D. D'Orbigny, 1842 †) - (NATICIDAE) (FOSSIL)
- clementina, Odostomia clementina W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- clementina, Metasterkia clementina (V. Sterki, 1890) - (VERTIGINIDAE)
- clementina oldroydi, Bifidaria clementina oldroydi E.G. Vanatta, 1916 - syn of: Metasterkia clementina (V. Sterki, 1890) - (VERTIGINIDAE)
- clementinum, Douvilleiceras clementinum (A.V.M.D. D'Orbigny, 1841 †) - (DOUVILLEICERATIDAE) (FOSSIL)
- clementinum, Epitonium clementinum (J.P.S. Grateloup, 1840) - (EPITONIIDAE)
- clementinum, Eutrephoceras clementinum (A.V.M.D. D'Orbigny, 1840 †) - (NAUTILIDAE) (FOSSIL)
- clementinum, Thracia clementinum P.P. Carpenter, 1857 - syn of: Thracia curta T.A. Conrad, 1837 - (THRACIIDAE)
- clementinus, Limatofusus clementinus (W.H. Dall, 1919) - (BUCCINIDAE)
- clementinus, Retimohnia clementinus W.H. Dall, 1919 - syn of: Limatofusus clementinus (W.H. Dall, 1919) - (BUCCINIDAE)
- clementinus, Scalaria clementinus J.B. † - (EPITONIIDAE) (FOSSIL)
- clementis, Emoda clementis W.J. Clench & C.G. Aguayo, 1950 - (HELICINIDAE)
- clementsi, Alycaeus clementsi Foon & Liew, 2017 - (CYCLOPHORIDAE)
- clemonensis, Aequipecten andersoni clemonensis Etherington † - (PECTINIDAE) (FOSSIL)
- clemvillensis, Cyrtolites clemvillensis Northrop, 1939 † - syn of: Zonidiscus clemvillensis (Northrop, 1939 †) - (CYRTOLITIDAE) (FOSSIL)
- clemvillensis, Zonidiscus clemvillensis (Northrop, 1939 †) - (TROPIDODISCIDAE) (FOSSIL)
- Clencharia, Genus Clencharia A.H. Clarke, 1961 (MALLETIIDAE)
- clenchi, Archachatina marginata clenchi J.C. Bequaert, 1950 - (ACHATINIDAE)
- clenchi, Spirolaxis clenchi M.L. Jaume & P.J. Borro, 1946 - syn of: Spirolaxis centrifuga (T.A. de M. Monterosato, 1890) - (ARCHITECTONICIDAE)
- clenchi, Neptunea despecta clenchi A.H. Clarke, 1956 - (BUCCINIDAE)
- clenchi, Caecum clenchi A.A. Olsson & J.T.L. McGinty, 1958 - syn of: Caecum cycloferum Folin, 1867 - (CAECIDAE)
- clenchi, Caecum clenchi A.A. Olsson & J.T.L. McGinty, 1958 - syn of: Caecum cycloferum Folin, 1867 - (CAECIDAE)
- clenchi, Callistochiton clenchi E.A. Ashby & B.C. Cotton, 1934 - (CALLISTOPLACIDAE)
- clenchi, Noctepuna poiretiana clenchi D.F. McMichael, 1958 - (CAMAENIDAE)
- clenchi, Brocchinia clenchi R.E. Petit, 1986 - (CANCELLARIIDAE)
- clenchi, Cerion clenchi S.J. Gould & D.S. Woodruff, 1986 - (CERIONIDAE)
- clenchi, Felimida clenchi (H.D. Russell, 1935) - (CHROMODORIDIDAE)
- clenchi, Glossodoris clenchi H.D. Russell, 1935 - syn of: Felimida clenchi (H.D. Russell, 1935) - (CHROMODORIDIDAE)
- clenchi, Aroapyrgus clenchi (C. Goodrich & H. Van Der Schalie, 1937) - (COCHLIOPIDAE)
- clenchi, Conus clenchi C.M. Martins, 1945 - syn of: Lamniconus lemniscatus (L.A. Reeve, 1849) - (CONIDAE)
- clenchi, Fusinus clenchi H.R. Bullis - syn of: Fusinus benjamini R. Hadorn, 1997 - (FASCIOLARIIDAE)
- clenchi, Fissurella clenchi I. Pérez Farfante, 1943 - (FISSURELLIDAE)
- clenchi, Somatogyrus clenchi C. Goodrich & H. Van Der Schalie, 1937 - syn of: Aroapyrgus clenchi (C. Goodrich & H. Van Der Schalie, 1937) - (LITHOGLYPHIDAE)
- clenchi, Parvilucina clenchi C.O. Van Regteren Altena, 1968 - (LUCINIDAE)
- clenchi, Farcimen auriculatum clenchi C. de la Torre & P. Bartsch, 1942 - (MEGALOMASTOMIDAE)
- clenchi, Trophon clenchi (A. Carcelles, 1953) - (MURICIDAE)
- clenchi, Neritina clenchi H.D. Russell, 1940 - (NERITIDAE)
- clenchi, Liguus fasciatus clenchi H.G. Frampton, 1932 - (ORTHALICIDAE)
- clenchi, Phenacovolva clenchi C.N. Cate, 1973 - (OVULIDAE)
- clenchi, Goniobasis clenchi C. Goodrich, 1924 - (PLEUROCERIDAE)
- clenchi, Patera clenchi H.A. Rehder, 1932 - (POLYGYRIDAE)
- clenchi, Wrightudora clenchi C.G. Aguayo & M.L. Jaume, 1954 - (POMATIIDAE)
- clenchi, Kisslingia clenchi (H.A. Pilsbry) - (POMATIIDAE)
- clenchi, Chondropoma ernesti clenchi C.G. Aguayo, 1932 - (POMATIIDAE)
- clenchi, Spathoderma clenchi A.H. Scheltema, 1985 - (PROCHAETODERMATIDAE)
- clenchi, Tetrentodon clenchi (C.G. Aguayo, 1932) - (UROCOPTIDAE)
- clenchi, Lirophora clenchi (T.E. Pulley, 1952) - (VENERIDAE)
- clenchi, Xylophaga clenchi H. Turner & J.L. Culliney, 1971 - (XYLOPHAGAIDAE)
- Clenchicoptis, syn of: Genus Heterocoptis M.L. Jaume & C. de la Torre, 1972 (UROCOPTIDAE)
- Clenchiella, Genus Clenchiella R.T. Abbott, 1948 (CLENCHIELLIDAE)
- CLENCHIELLIDAE Taylor, 1966 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-LITTORINIMORPHA [Order]-TRUNCATELLOIDEA [Superfamily])
- Clenchina, syn of: Genus Scaphella Swainson, 1832 † (VOLUTIDAE) (FOSSIL)
- Clenchipoma, syn of: Genus Parachondria W.H. Dall, 1905 (POMATIIDAE)
- clendenini, Miraclathurella clendenini E.F. Garcia, 2008 - (PSEUDOMELATOMIDAE)
- cleo, Marginella cleo P. Bartsch, 1915 - syn of: Volvarina bilineata (C.F.F. von Krauss, 1848) - (MARGINELLIDAE)
- cleo, Turbonilla cleo K.H.J. Thiele, 1925 - (PYRAMIDELLIDAE)
- cleo, Schwartziella cleo (P. Bartsch, 1915) - (ZEBINIDAE)
- Cleobis, Subgenus Megadesmus (Cleobis) Dana, 1847 † (MEGADESMIDAE) (FOSSIL)
- Cleobula, syn of: Genus Dendroconus W.J. Swainson, 1840 (CONIDAE)
- Cleobula, syn of: Genus Dendroconus W.J. Swainson, 1840 (CONIDAE)
- Cleodora, syn of: Genus Clio C. Linnaeus, 1767 (CLIIDAE)
- Cleogastroplites, Genus Cleogastroplites Jeletzky , 1980 † (HOPLITIDAE) (FOSSIL)
- cleon, Cleoniceras cleon (A.V.M.D. D'Orbigny, 1841 †) - (HOPLITIDAE) (FOSSIL)
- Cleone, syn of: Genus Cristaria H.C.F. Schumacher, 1817 (UNIONIDAE)
- Cleoniceras, Genus Cleoniceras Parona & Bonarelli, 1897 † (HOPLITIDAE) (FOSSIL)
- cleopathra, Calliostoma cleopathra É.A.A. Locard, 1896 - syn of: Calliostoma cleopatra (É.A.A. Locard, 1896) - (CALLIOSTOMATIDAE)
- cleopatra, Calliostoma cleopatra (É.A.A. Locard, 1896) - (CALLIOSTOMATIDAE)
- cleopatra, Cribrarula cumingii cleopatra F.A. Schilder & M. Schilder, 1938 - (CYPRAEIDAE)
- Cleopatra, Genus Cleopatra F.H. Troschel, 1856 (PALUDOMIDAE)
- cleopatrae, Mytilus cleopatrae P. Oppenheim, 1903 † - (MYTILIDAE) (FOSSIL)
- cleopatrae, Succinea cleopatrae P.M. Pallary - (SUCCINEIDAE)
- cleopatrae, Turris cleopatrae Abbass, 1967 † - (TURRIDAE) (FOSSIL)
- Cleospira, Genus Cleospira J.H. McLean, 1971 (STRICTISPIRIDAE)
- Cleostyla, Subgenus Chilonopsis (Cleostyla) W.H. Dall, 1896 (SUBULINIDAE)
- Cleotrivia, Genus Cleotrivia T. Iredale, 1930 (TRIVIIDAE)
- clerchi, Chondrothyrium violaceum clerchi C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- clerchi, Tetrentodon clerchi (R. Arango in L. Pfeiffer, 1870) - (UROCOPTIDAE)
- clerchi, Macroceramus clerchi R. Arango in L. Pfeiffer, 1866 - (UROCOPTIDAE)
- clerchi arangoi, Macroceramus clerchi arangoi L. Pfeiffer, 1866 - (UROCOPTIDAE)
- clerchi imiasensis, Macroceramus clerchi imiasensis C. de la Torre & P. Bartsch - (UROCOPTIDAE)
- clerchi jaucosensis, Macroceramus clerchi jaucosensis M.I. Sánchez Roig - (UROCOPTIDAE)
- clericus, Oocorys clericus J.F. Quinn, 1980 - (CASSIDAE)
- clerii, Lamniconus clerii (L.A. Reeve, 1844) - (CONIDAE)
- clerii, Cumingia clerii A. Adams, 1850 - syn of: Mulinia byronensis Gray, 1837 - (SEMELIDAE)
- clerii tostesi, Lamniconus clerii tostesi E.J. Petuch, 1979 - syn of: Lamniconus tostesi (E.J. Petuch, 1979) - (CONIDAE)
- clermont, Laevidelos clermont J. Stanisic, 2010 - (RHYTIDIDAE)
- clertoni, Psilaxis clertoni D. de Oliveira Tenório, J.C.N. Barros & al., 2011 - (ARCHITECTONICIDAE)
- clerxi, Opisthostoma clerxi W.J.M. Maassen, 2002 - (DIPLOMMATINIDAE)
- cleryana, Cardiomya cleryana (A.V.M.D. D'Orbigny, 1842) - (CUSPIDARIIDAE)
- cleryana, Mulinia cleryana (A.V.M.D. D'Orbigny, 1846) - (MACTRIDAE)
- cleryana, Mactra cleryana D'Orbigny, 1846 - syn of: Mulinia cleryana (A.V.M.D. D'Orbigny, 1846) - (MACTRIDAE)
- cleryana, Sphenia cleryana D'Orbigny, 1842 - syn of: Cardiomya cleryana (A.V.M.D. D'Orbigny, 1842) - (MYIDAE)
- cleryana, Macoma cleryana (A.V.M.D. D'Orbigny, 1846) - (TELLINIDAE)
- cleryana, Venus cleryana d'Orbigny, 1842 † - (VENERIDAE) (FOSSIL)
- cleryana, Odontocymbiola americana cleryana (S.A.A. Petit De La Saussaye, 1856) - (VOLUTIDAE)
- cleryana branneri, Mulinia cleryana branneri W.H. Dall, 1901 - (MACTRIDAE)
- cleryanus, Aeneator cleryanus (A.V.M.D. D'Orbigny, 1842 †) - (BUCCINIDAE) (FOSSIL)
- cleryanus, Fusus cleryanus A.V.M.D. D'Orbigny, 1842 † - syn of: Aeneator cleryanus (A.V.M.D. D'Orbigny, 1842 †) - (FASCIOLARIIDAE) (FOSSIL)
- cleryi, Eumecostylus cleryi (S.A.A. Petit De La Saussaye, 1850) - (BOTHRIEMBRYONTIDAE)
- cleryi, Dendrotrochus helicinoides cleryi (C.A. Récluz, 1851) - (HELICARIONIDAE)
- cleryi, Helix cleryi C.A. Récluz, 1851 - syn of: Dendrotrochus helicinoides cleryi (C.A. Récluz, 1851) - (HELICIDAE)
- cleryi, Marginella cleryi S.A.A. Petit De La Saussaye, 1836 - (MARGINELLIDAE)
- cleryi, Typhis cleryi S.A.A. Petit De La Saussaye, 1840 - syn of: Typhina belcheri (W.J. Broderip, 1833) - (MURICIDAE)
- Clessinella, syn of: Genus Eupera J.R. Bourguignat, 1854 (SPHAERIIDAE)
- clessini, Macrochlamys clessini C.A. Westerlund, 1902 - (ARIOPHANTIDAE)
- clessini, Bithynia clessini Š. Brusina, 1884 † - (BITHYNIIDAE) (FOSSIL)
- clessini, Bythinella clessini Rzehac, 1888 - (BYTHINELLIDAE)
- clessini, Buliminus clessini O. von Retowski, 1883 - syn of: Euchondrus lamellifera (E.A. Rossmässler, 1858) - (ENIDAE)
- clessini, Terebrella clessini (H. von Maltzan, 1886 †) - (FERUSSACIIDAE) (FOSSIL)
- clessini, Helix clessini J. Ulicný, 1885 - syn of: Plicuteria lubomirskii (Slosarski, 1881) - (HELICIDAE)
- clessini, Odontohydrobia clessini P.S. Pavlovic, 1927 † - (HYDROBIIDAE) (FOSSIL)
- clessini, Bythiospeum clessini (C.D. Weinland, 1883) - (HYDROBIIDAE)
- clessini, Diatrypesis clessini (Maltzan, 1886) - (METACERITHIIDAE)
- clessini, Anodontites clessini A.E. Ortmann, 1921 - syn of: Anodontites obtusa (J.B. von Spix & J.A. Wagner, 1827) - (MYCETOPODIDAE)
- clessini, Mycetopus clessini H.F.A. von Ihering, 1933 - syn of: Mycetopoda siliquosa (J.B. von Spix, 1827) - (MYCETOPODIDAE)
- clessini, Anodontites tenebricosa clessini (P. Fischer, 1890) - (MYCETOPODIDAE)
- clessini, Segmentina clessini (C.A. Westerlund, 1873) - (PLANORBIDAE)
- clessini, Vitrea clessini P. Hesse, 1882 - (PRISTILOMATIDAE)
- clessini, Odostomia clessini W.H. Dall & P. Bartsch, 1909 - (PYRAMIDELLIDAE)
- clessini, Pisidium clessini G. Surbeck, 1899 - syn of: Pisidium conventus S. Clessin, 1877 - (SPHAERIIDAE)
- clessini, Calyculina clessini S. Clessin, 1882 - syn of: Musculium lacustre (O.F. Müller, 1774) - (SPHAERIIDAE)
- clessini, Anodonta clessini J.R. Bourguignat, 1881 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- clessini, Sunetta clessini C.M.F. Ancey, 1880 - syn of: Sunetta solanderii (J.E. Gray, 1825) - (VENERIDAE)
- clessini moenanum, Bythiospeum clessini moenanum (K. Flach, 1886) - (HYDROBIIDAE)
- clessini posterum, Bythiospeum clessini posterum (D. Geyer, 1904) - (HYDROBIIDAE)
- clessini septentrionale, Bythiospeum clessini septentrionale (H. Schütt, 1960) - (HYDROBIIDAE)
- Clessinia, Genus Clessinia A. Doering, 1874 (ODONTOSTOMIDAE)
- clessiniana, Ferrissia clessiniana (C.F. Jickeli, 1882) - (PLANORBIDAE)
- clessiniana, Turbonilla clessiniana (S. Nomura, 1938) - (PYRAMIDELLIDAE)
- clessiniana, Chemnitzia clessiniana S. Nomura, 1938 - syn of: Turbonilla clessiniana (S. Nomura, 1938) - (PYRAMIDELLIDAE)
- Clessinicyclas, syn of: Genus Sphaerium J.A. Scopoli, 1777 (SPHAERIIDAE)
- Clessiniella, syn of: Subgenus Cochlostoma (Neglecta) A.J. Wagner, 1897 (COCHLOSTOMATIDAE)
- Clessiniola, Genus Clessiniola W.A. Lindholm, 1924 (HYDROBIIDAE)
- cleta, Anachis cleta P.L. Duclos, 1846 - syn of: Costoanachis avara (T. Say, 1822) - (COLUMBELLIDAE)
- Cletella, syn of: Genus Pisidium L. Pfeiffer, 1821 (SPHAERIIDAE)
- clethra, Strioterebrum clethra C.J. Maury, 1925 † - (TEREBRIDAE) (FOSSIL)
- cleti, Chondropoma cleti C.G. Aguayo, 1939 - (POMATIIDAE)
- clevei, Pulsarella clevei (F.P. Jousseaume, 1883) - (BORSONIIDAE)
- clevei, Planorbis clevei A. Cousin, 1887 - syn of: Biomphalaria occidentalis W.L. Paraense, 1981 - (PLANORBIDAE)
- clevei, Vertigo clevei C.A. Westerlund, 1887 - syn of: Vertigo pusilla O.F. Müller, 1774 - (VERTIGINIDAE)
- clevelandicus, Parallelodon clevelandicus Tate † - (PARALLELODONTIDAE) (FOSSIL)
- Cleviceras, Genus Cleviceras Howarth, 1992 (HILDOCERATIDAE) (FOSSIL)
- Clidiophora, Subgenus Pandora (Clidiophora) P.P. Carpenter, 1864 (PANDORIDAE)
- Clidiphora, syn of: Subgenus Pandora (Clidiophora) P.P. Carpenter, 1864 (PANDORIDAE)
- Clidophorus, Genus Clidophorus Hall, 1862 † (NUCULANIDAE) (FOSSIL)
- cliendentata, Chondrina cliendentata E. Gittenberger, 1973 - (CHONDRINIDAE)
- clienta, Chondrina clienta (C.A. Westerlund, 1883) - (CHONDRINIDAE)
- clienta caucasica, Chondrina clienta caucasica P. Ehrmann, 1931 - (CHONDRINIDAE)
- clifdenensis, Borsonia clifdenensis Finlay, 1930 † - (BORSONIIDAE) (FOSSIL)
- clifdenensis, Penion clifdenensis (Finlay, 1930 †) - (BUCCINIDAE) (FOSSIL)
- clifdenensis, Seila clifdenensis (C.R. Laws, 1941 †) - (CERITHIOPSIDAE) (FOSSIL)
- clifdenensis, Spissatella clifdenensis Finlay, 1926 † - (CRASSATELLIDAE) (FOSSIL)
- clifdenensis, Notadusta clifdenensis W.O. Cernohorsky, 1971 † - (CYPRAEIDAE) (FOSSIL)
- clifdenensis, Splendrillia clifdenensis A.W.B. Powell, 1942 † - (DRILLIIDAE) (FOSSIL)
- clifdenensis, Austroclavus clifdenensis A.W.B. Powell, 1942 † - (DRILLIIDAE) (FOSSIL)
- clifdenensis, Dolicrossea clifdenensis Finlay, 1930 † - (ELACHISINIDAE) (FOSSIL)
- clifdenensis, Leptochiton clifdenensis (E.A. Ashby, 1929 †) - (LEPTOCHITONIDAE) (FOSSIL)
- clifdenensis, Vexiguraleus clifdenensis A.W.B. Powell, 1942 † - (MANGELIIDAE) (FOSSIL)
- clifdenensis, Typhis clifdenensis P. Vella, 1961 † - (MURICIDAE) (FOSSIL)
- clifdenensis, Murexsul clifdenensis Finlay, 1930 † - (MURICIDAE) (FOSSIL)
- clifdenensis, Magnatica clifdenensis Finlay, 1926 † - (NATICIDAE) (FOSSIL)
- clifdenensis, Comitileda clifdenensis (Powell, 1935 †) - (NUCULANIDAE) (FOSSIL)
- clifdenensis, Charonia clifdenensis Marshall & Murdoch 1923 - (RANELLIDAE)
- clifdenensis, Erato clifdenensis C.R. Laws, 1935 † - (TRIVIIDAE) (FOSSIL)
- clifdenensis, Gemmula clifdenensis A.W.B. Powell, 1942 † - (TURRIDAE) (FOSSIL)
- clifdenensis, Metamelon clifdenensis (Finlay, 1926 †) - (VOLUTIDAE) (FOSSIL)
- clifdenensis, Peculator clifdenensis (Finlay, 1930 †) - (VOLUTOMITRIDAE) (FOSSIL)
- clifdeni, Trachycystis clifdeni M. Connolly, 1932 - (CHAROPIDAE)
- clifdeni, Ferrissia clifdeni M. Connolly, 1939 - (PLANORBIDAE)
- Clifdenia, Genus Clifdenia Laws, 1932 † (MITRIDAE) (FOSSIL)
- clifdenica, Tomopleura clifdenica A.W.B. Powell, 1942 † - (BORSONIIDAE) (FOSSIL)
- clifdenica, Etremopsis clifdenica A.W.B. Powell, 1942 † - (CLATHURELLIDAE) (FOSSIL)
- clifdenica, Austrotoma clifdenica A.W.B. Powell, 1942 † - (CONOIDEA (UNASSIGNED)) (FOSSIL)
- clifdenica, Anacithara clifdenica A.W.B. Powell, 1942 † - (HORAICLAVIDAE) (FOSSIL)
- clifdenica, Turbonilla clifdenica C.R. Laws, 1937 † - (PYRAMIDELLIDAE) (FOSSIL)
- clifdenica, Maoridaphne clifdenica (C.R. Laws, 1939 †) - (RAPHITOMIDAE) (FOSSIL)
- cliffensis, Leptosphinctes cliffensis (Imlay, 1962 †) - (PERISPHINCTIDAE) (FOSSIL)
- cliffensis, Spondylus cliffensis G.D. Hanna, 1927 † - (SPONDYLIDAE) (FOSSIL)
- cliffordi, Strophiops martensi cliffordi W.J. Clench, 1933 - (CERIONIDAE)
- cliftonensis, Notosepia cliftonensis A.C. Chapman, 1915 † - (BELOSAEPIIDAE) (FOSSIL)
- cliftonensis, Austrofusus cliftonensis (J. Marwick, 1926 ) - (BUCCINIDAE)
- cliftonensis, Natica cliftonensis Clark, 1895 † - (NATICIDAE) (FOSSIL)
- cliftonensis, Nuculana cliftonensis (Clark & Martin, 1901 †) - (NUCULANIDAE) (FOSSIL)
- cliftonensis, Platyostoma cliftonensis Foerste, 1909 † - (PLATYCERATIDAE) (FOSSIL)
- Cliftonoceras, Genus Cliftonoceras Flower, 1957 † (URANOCERATIDAE) (FOSSIL)
- clignetti, Indopecten clignetti (Krumbeck, 1913 †) - (PECTINIDAE) (FOSSIL)
- CLIIDAE Jeffreys, 1869 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-THECOSOMATA [Order]-CAVOLINIOIDEA [Superfamily])
- clima, Volvarina clima (B.C. Cotton, 1949 †) - (MARGINELLIDAE) (FOSSIL)
- Climacea, syn of: Genus Anticlimax H.A. Pilsbry & J.T.L. McGinty, 1946 (TORNIDAE)
- climacella, Belomitra climacella (W.H. Dall, 1895) - (BELOMITRIDAE)
- climacella, Pleurotomella climacella W.H. Dall, 1895 - syn of: Belomitra climacella (W.H. Dall, 1895) - (RAPHITOMIDAE)
- Climacia, syn of: Genus Anticlimax H.A. Pilsbry & J.T.L. McGinty, 1946 (TORNIDAE)
- climacina, Fastigiella climacina A.E.M. Cossmann & G. Pissarro † - (CERITHIIDAE) (FOSSIL)
- Climacina, syn of: Genus Anticlimax H.A. Pilsbry & J.T.L. McGinty, 1946 (TORNIDAE)
- climacodes, Trophon climacodes (R.A. Philippi, 1887 †) - (MURICIDAE) (FOSSIL)
- climacographus, Bostryx climacographus E.L. Holmberg, 1912 - (BULIMULIDAE)
- Climacopoma, Subgenus Torinia (Climacopoma) Fischer, 1885 † (ARCHITECTONICIDAE) (FOSSIL)
- Climacoraphistoma, Genus Climacoraphistoma Vostokova, 1955 † (LESUEURILLIDAE) (FOSSIL)
- climacota, Zemacies climacota (H.H. Suter, 1917 †) - (BORSONIIDAE) (FOSSIL)
- climacota, Minolia climacota J.C. Melvill, 1897 - syn of: Pseudominolia climacota (J.C. Melvill, 1897) - (SOLARIELLIDAE)
- climacota, Pseudominolia climacota (J.C. Melvill, 1897) - (TROCHIDAE)
- climacota, Coluzea climacota (H.H. Suter, 1917 †) - (TURBINELLIDAE) (FOSSIL)
- climacoton, Uromitra climacoton J. Gardner, 1938 † - (COSTELLARIIDAE) (FOSSIL)
- Climacotrigonia, Genus Climacotrigonia Cox, 1964 † (TRIGONIIDAE) (FOSSIL)
- climacotum, Epitonium climacotum R.N. Kilburn, 1985 - (EPITONIIDAE)
- climacterica, Khasiella climacterica (W.H. Benson, 1836) - (ARIOPHANTIDAE)
- climakis, Mangelia climakis R.B. Watson, 1886 - syn of: Belomitra quadruplex (R.B. Watson, 1882) - (MANGELIIDAE)
- climakis, Pleurotoma climakis R.B. Watson, 1886 - syn of: Belomitra quadruplex (R.B. Watson, 1882) - (TURRIDAE)
- climax, Clausilia climax O. Böttger, 1888 - syn of: Index index (A. Mousson, 1863) - (CLAUSILIIDAE)
- climax, Uromitra climax J. Gardner, 1938 † - (COSTELLARIIDAE) (FOSSIL)
- climax, Hipponix climax L.R.L. Simone, 2005 - (HIPPONICIDAE)
- Climocella, Genus Climocella J.F. Goulstone, 1996 (CHAROPIDAE)
- climoi, Suterilla climoi H. Fukuda, W.F. Ponder & B.A. Marshall, 2006 - (ASSIMINEIDAE)
- climoi, Allodiscus climoi B.A. Marshall & G.M. Barker, 2008 - (CHAROPIDAE)
- climoi, Latia climoi Y.I. Starobogatov, 1986 - (LATIIDAE)
- climoi, Cytora climoi B.A. Marshall & G.M. Barker, 2007 - (LIAREIDAE)
- climoi, Leucosyrinx climoi P.A. Maxwell, 1988 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- climoi, Smeagol climoi S. Tillier & W.F. Ponder, 1992 - (SMEAGOLIDAE)
- clinata, Astartella clinata Hoare, 2007 † - (ASTARTIDAE) (FOSSIL)
- clinatus, Mytiloceramus clinatus Koschelkina, 1969 † - syn of: Retroceramus clinatus (Koschelkina, 1969 †) - (PTERIIDA (unassigned)) (FOSSIL)
- clinatus, Retroceramus clinatus (Koschelkina, 1969 †) - (RETROCERAMIDAE) (FOSSIL)
- clinei, Gastrioceras clinei Miller & Owen, 1937 † - syn of: Syngastrioceras clinei (Miller & Owen, 1937 †) - (GASTRIOCERATIDAE) (FOSSIL)
- clinei, Syngastrioceras clinei (Miller & Owen, 1937 †) - (GLAPHYRITIDAE) (FOSSIL)
- clingmani, Glyphyalinia clingmani (W.H. Dall, 1890) - (ZONITIDAE)
- clingmanicus, Mesodon clingmanicus (H.A. Pilsbry, 1904) - (POLYGYRIDAE)
- clinisepta, Costatheca clinisepta (A.V. Sysoev, 1960 †) - (TETRATHECIDAE) (FOSSIL)
- clinisepta, Tetratheca clinisepta A.V. Sysoev, 1960 † - syn of: Costatheca clinisepta (A.V. Sysoev, 1960 †) - (TETRATHECIDAE) (FOSSIL)
- Clinispira, Genus Clinispira L.R.L. Simone & R. Casati, 2013 (ODONTOSTOMIDAE)
- Clinocaprina, Genus Clinocaprina Mitchell, 2013 † (ANTILLOCAPRINIDAE) (FOSSIL)
- Clinocardium, Genus Clinocardium A.M. Keen, 1936 (CARDIIDAE)
- Clinoceras, Genus Clinoceras Mascke, 1876 † (CLINOCERATIDAE) (FOSSIL)
- CLINOCERATIDAE Flower, 1946 † - Family (CEPHALOPODA-ORTHOCERATOIDEA [Subclass]-ORTHOCERIDA [Order]) (FOSSIL)
- clinocnemus, Mirachelus clinocnemus J.F. Quinn, 1979 - (CHILODONTIDAE)
- clinolobatus, Baculites clinolobatus Elias, 1933 † - (BACULITIDAE) (FOSSIL)
- Clinolobus, Genus Clinolobus Gemmellaro , 1887 † (METALEGOCERATIDAE) (FOSSIL)
- Clinomitra, syn of: Subgenus Mitromorpha (Mitrolumna) M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1883 (MITROMORPHIDAE)
- Clinopegma, Subgenus Ancistrolepis (Clinopegma) U.S. Grant & H.R. Gale, 1931 (BUCCINIDAE)
- Clinopista, syn of: Genus Clinopistha Meek & Worthen, 1870 † (CLINOPISTHIDAE) (FOSSIL)
- Clinopistha, Genus Clinopistha Meek & Worthen, 1870 † (CLINOPISTHIDAE) (FOSSIL)
- CLINOPISTHIDAE Pojeta, 1988 † - Family (BIVALVIA-PROTOBRANCHIA [Subclass]-SOLEMYIDA [Order]-SOLEMYOIDEA [Superfamily]) (FOSSIL)
- clinoseptatum, Eocyclostomiceras clinoseptatum C. Chen, in Z. Qi & al, 1983 † - (CYCLOSTOMICERATIDAE) (FOSSIL)
- clinovata, Naticopsis clinovata W.J. Gordon & E.L. Yochelson, 1987 † - (DELPHINULOPSIDAE) (FOSSIL)
- clintonense, Lechritrochoceras clintonense Flower, 1942 † - (LECHRITROCHOCERATIDAE) (FOSSIL)
- clintonensis, Strotostoma clintonensis C.O. Waterhouse, 1986 † - (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- clintonensis, Platyostoma clintonensis Foerste, 1909 † - syn of: Platyostoma cliftonensis Foerste, 1909 † - (PLATYCERATIDAE) (FOSSIL)
- clintonensis, Ptychobranchus clintonensis C.T. Simpson, 1900 - syn of: Ptychobranchus occidentalis (T.A. Conrad, 1836) - (UNIONIDAE)
- clintoni, Stereospyroceras clintoni (Miller, 1877 †) - (PROTEOCERATIDAE) (FOSSIL)
- clintoni, Spyroceras clintoni Miller, 1877 † - syn of: Stereospyroceras clintoni (Miller, 1877 †) - (SPYROCERATIDAE) (FOSSIL)
- clintonius, Placopecten clintonius (T. Say, 1824 †) - (PECTINIDAE) (FOSSIL)
- Clinura, Genus Clinura L.M.D. Bellardi, 1875 (RAPHITOMIDAE)
- Clinurella, Genus Clinurella Sacco, 1890 † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Clinuromella, syn of: Genus Benthomangelia K.H.J. Thiele, 1925 (MANGELIIDAE)
- Clinuropsis, Genus Clinuropsis Vincent, 1913 † (RAPHITOMIDAE) (FOSSIL)
- Clio, Genus Clio C. Linnaeus, 1767 (CLIIDAE)
- clio, Sphyradoceras clio (J.W. Hall, 1861 †) - (NEPHRITICERATIDAE) (FOSSIL)
- clio, Triphora clio C. Hedley, 1899 - (TRIPHORIDAE)
- clio, Monophyllites clio Mojsisovics, 1879 † - syn of: Eopsiloceras planorboides (Guembel, 1861 †) - (USSURITIDAE) (FOSSIL)
- Clioderma, syn of: Genus Pterotheca Salter, 1853 † (PTEROTHECIDAE) (FOSSIL)
- cliodita, Spongiobranchaea cliodita J.R.C. Quoy & J.P. Gaimard, 1823 - syn of: Spongiobranchaea australis (A.V.M.D. D'Orbigny, 1834) - (PNEUMODERMATIDAE)
- Cliodita, syn of: Genus Spongiobranchaea D'Orbigny, 1836 (PNEUMODERMATIDAE)
- Cliodora, syn of: Genus Clio C. Linnaeus, 1767 (CLIIDAE)
- cliona, Cymenorytis cliona (Raincourt & Munier, 1863 †) - (VANIKORIDAE) (FOSSIL)
- Clione, Genus Clione P.S. Pallas, 1774 (CLIONIDAE)
- Clionella, Genus Clionella J.E. Gray, 1847 (CLAVATULIDAE)
- clionella, Leucosyrinx clionella W.H. Dall, 1908 - (PSEUDOMELATOMIDAE)
- clionellaeformis, Drillia clionellaeformis (H.C. Weinkauff & W. Kobelt, 1875) - (DRILLIIDAE)
- clionellaeformis, Turris clionellaeformis (H.C. Weinkauff & W. Kobelt, 1875) - syn of: Drillia clionellaeformis (H.C. Weinkauff & W. Kobelt, 1875) - (TURRIDAE)
- CLIONIDAE Rafinesque, 1815 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-GYMNOSOMATA [Order]-CLIONOIDEA [Superfamily])
- Clionina, syn of: Genus Paraclione J.J. Tesch, 1903 (CLIONIDAE)
- Clionites, syn of: Genus Clionitites Strand , 1929 † (CLIONITITIDAE) (FOSSIL)
- Clionitites, Genus Clionitites Strand , 1929 † (CLIONITITIDAE) (FOSSIL)
- CLIONITITIDAE Arabu, 1932 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-CLYDONITOIDEA [Superfamily]) (FOSSIL)
- Clionopsis, syn of: Genus Cliopsis F.H. Troschel, 1854 (CLIOPSIDAE)
- Clionychia, syn of: Genus Cleionychia Ulrich, 1892 † (AMBONYCHIIDAE) (FOSSIL)
- Clionyssiceras, Genus Clionyssiceras Foerste, 1930 † (ACLEISTOCERATIDAE) (FOSSIL)
- CLIOPSIDAE O.G. Costa, 1873 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-GYMNOSOMATA [Order]-CLIONOIDEA [Superfamily])
- Cliopsis, Genus Cliopsis F.H. Troschel, 1854 (CLIOPSIDAE)
- Cliopteria, Genus Cliopteria Williams, 1912 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- Clioscaphites, Genus Clioscaphites Cobban, 1951 † (SCAPHITIDAE) (FOSSIL)
- clipeata, Anculosa clipeata E.A. Smith, 1922 - (PLEUROCERIDAE)
- clipeus, Colpentolium clipeus Yamani, 1983 † - (ENTOLIIDAE) (FOSSIL)
- clippertonense, Homalopoma clippertonense (L.G. Hertlein & W.K. Emerson, 1953) - (COLLONIIDAE)
- clippertonensis, Latirus clippertonensis L.G. Hertlein & E.C. Allison, 1968 - syn of: Polygona socorroensis (L.G. Hertlein & A.M. Strong, 1951) - (FASCIOLARIIDAE)
- clippertonensis, Ctena clippertonensis P. Bartsch & H.A. Rehder, 1939 - (LUCINIDAE)
- clippertonensis, Turbonilla clippertonensis L.G. Hertlein & E.C. Allison, 1968 - (PYRAMIDELLIDAE)
- clishevichi, Cambridium clishevichi Koneva, 1979 † - (CAMBRIDIIDAE) (FOSSIL)
- clisia, Mactrellona clisia (W.H. Dall, 1915) - (MACTRIDAE)
- Clisocolus, Genus Clisocolus Gabb, 1868 † (MACTROMYIDAE) (FOSSIL)
- Clisospira, Genus Clisospira Billings, 1865 † (CLISOSPIRIDAE) (FOSSIL)
- CLISOSPIRIDAE S.A. Miller, 1889 † - Family (MOLLUSCA INCERTAE SEDIS-MIMOSPIRIDA [Order]-CLISOSPIROIDEA [Superfamily]) (FOSSIL)
- CLISOSPIRINAE - syn of Family: CLISOSPIRIDAE (FOSSIL)
- clissana, Medora macascarensis clissana (K. Brancsik, 1897) - (CLAUSILIIDAE)
- Clistaxis, syn of: Genus Cylichna S.L. Lovén, 1846 (CYLICHNIDAE)
- Clistoceras, Genus Clistoceras Nassichuk , 1967 † (STENOGLAPHYRITIDAE) (FOSSIL)
- Clistoconcha, Genus Clistoconcha E.A. Smith, 1910 (CLISTOCONCHIDAE)
- CLISTOCONCHIDAE Morton, 2012 - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-ANOMALODESMATA [Order]-THRACIOIDEA [Superfamily])
- clitellarium, Ephippioceras clitellarium (Sowerby, 1840 †) - (EPHIPPOCERATIDAE) (FOSSIL)
- Clitendoceras, Genus Clitendoceras Ulrich & Foerste, 1936 † (PROTEROCAMEROCERATIDAE) (FOSSIL)
- clitharellus, Cumia clitharellus R. Tate, 1888 † - (COLUBRARIIDAE) (FOSSIL)
- clitheroensis, Ammonellipsites clitheroensis Riley, 1996 † - (PERICYCLIDAE) (FOSSIL)
- Clithon, Subgenus Theodoxus (Clithon) P.D. Montfort, 1810 (NERITIDAE)
- CLITOCERATIDAE - syn of Family: CAECIDAE
- Cliton, syn of: Subgenus Theodoxus (Clithon) P.D. Montfort, 1810 (NERITIDAE)
- clitonota, Glossodoris clitonota L.S.R. Bergh, 1905 - syn of: Mexichromis lemniscata (J.R.C. Quoy & J.P. Gaimard, 1832) - (CHROMODORIDIDAE)
- clitonota, Chromodoris clitonota L.S.R. Bergh, 1905 - syn of: Mexichromis lemniscata (J.R.C. Quoy & J.P. Gaimard, 1832) - (CHROMODORIDIDAE)
- clitum, Grimsbyoceras clitum (Billings, 1866 †) - (ACLEISTOCERATIDAE) (FOSSIL)
- clitumni, Cernuella clitumni W. Kobelt, 1907 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- clivi, Bayleoidea clivi Palmer 1928 † - (REQUIENIIDAE) (FOSSIL)
- clivicola, Admete clivicola T. Høisæter, 2011 - (CANCELLARIIDAE)
- clivicola, Aenigmatoconcha clivicola C. Tumpeesuwan & S. Tumpeesuwan, 2017 - (HELICARIONIDAE)
- clivicola, Chondrothyretes shuttleworthi clivicola (C. de la Torre & P. Bartsch, 1938) - (POMATIIDAE)
- Clivipollia, Subgenus Cantharus (Clivipollia) T. Iredale, 1929 (BUCCINIDAE)
- clivosa, Clathrospira clivosa Sardeson, 1892 † - syn of: Clathrospira conica Ulrich & Scofield, 1897 † - (EOTOMARIIDAE) (FOSSIL)
- clivosa, Eunema clivosa Ulrich & Scofield, 1897 † - syn of: Clathrospira conica Ulrich & Scofield, 1897 † - (LOPHOSPIRIDAE) (FOSSIL)
- clivosa, Waikura clivosa J. Marwick, 1931 † - (PYRAMIDELLIDAE) (FOSSIL)
- clivosa, Peronidia clivosa Böhm, 1916 - syn of: Macoma calcarea (J.F. Gmelin, 1792) - (TELLINIDAE)
- clivosa sakhalinensis, Peronidia clivosa sakhalinensis L.S. Zhidkova, 1972 † - syn of: Megangulus sakhalinensis (L.S. Zhidkova, 1972 †) - (TELLINIDAE) (FOSSIL)
- clivosus, Arctogymnites clivosus Bychkov & Vavilov, 1982 † - (BEYRICHITIDAE) (FOSSIL)
- Clivuloturris, Genus Clivuloturris Hickman, 1976 † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Clivunella, Genus Clivunella Katzer, 1918 † (CLAVATULIDAE) (FOSSIL)
- clivunensis, Illyricocongeria clivunensis (Kochansky-Devidé, 1981 †) - (DREISSENIDAE) (FOSSIL)
- cloaca, Herviella cloaca W.B. Rudman, 1980 - (GLAUCIDAE)
- cloacata, Mimachlamys cloacata (L.A. Reeve, 1853) - (PECTINIDAE)
- cloacata curtisiana, Mimachlamys cloacata curtisiana T. Iredale, 1939 - (PECTINIDAE)
- cloacata pelseneeri, Mimachlamys cloacata pelseneeri (P. Dautzenberg & A.R.J.B. Bavay, 1912) - (PECTINIDAE)
- cloacinum, Cardium cloacinum F.A. von Quenstedt, 1856 † - (CARDIIDAE) (FOSSIL)
- cloacinus, Schizodus cloacinus F.A. von Quenstedt, 1858 † - (SCHIZODIDAE) (FOSSIL)
- clochense, Campbelloceras clochense R.L. Collins † - (TARPHYCERATIDAE) (FOSSIL)
- clochensis, Archinacella clochensis Foerste, 1914 † - (ARCHINACELLIDAE) (FOSSIL)
- clochensis, Pterotheca clochensis Foerste, 1924 † - (PTEROTHECIDAE) (FOSSIL)
- clodianus, Conus clodianus G.D. Nardo, 1847 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- clodianus, Trochus clodianus G.D. Nardo, 1847 - syn of: Gibbula albida (J.F. Gmelin, 1791) - (TROCHIDAE)
- clodiense, Cerastoderma clodiense G.B. Brocchi, 1814 - syn of: Cerastoderma glaucum (J.G. Bruguière, 1789) - (CARDIIDAE)
- clodiensis, Donax clodiensis T.A. de M. Monterosato, 1884 - syn of: Donax semistriatus clodiensis (T.A. de M. Monterosato, 1884) - (DONACIDAE)
- clodiensis, Donax semistriatus clodiensis (T.A. de M. Monterosato, 1884) - (DONACIDAE)
- clodiensis, Nassa clodiensis G.S. Coen, 1933 - syn of: Nassarius nitidus (J.G. Jeffreys, 1867) - (NASSARIIDAE)
- Cloelia, syn of: Genus Hero J. Alder & A. Hancock, 1855 (HEROIDAE)
- cloezi, Rissoina cloezi L.J. Morlet, 1885 † - (RISSOINIDAE) (FOSSIL)
- Cloioceras, Genus Cloioceras Whitehouse, 1927 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- Cloisonnaria, syn of: Genus Kuphus J.É. Guettard, 1770 (TEREDINIDAE)
- clomuncula, Diplommatina clomuncula H.H. Godwin-Austen, 1892 - (DIPLOMMATINIDAE)
- cloneta, Moerella cloneta W.H. Dall, 1900 † - (TELLINIDAE) (FOSSIL)
- clopica, Helix clopica J.F. Mabille, 1888 - syn of: Camaena gabriellae (O.F. von Möllendorff, 1908) - (HELICIDAE)
- clorensis, Endolobus clorensis Collinson, 1955 † - (KONINCKIOCERATIDAE) (FOSSIL)
- clorionensis, Turritella clorionensis L.G. Hertlein & A.M. Strong, 1951 - syn of: Turritella clarionensis L.G. Hertlein & A.M. Strong, 1951 - (TURRITELLIDAE)
- closei, Noumea closei W.B. Rudman, 1986 - syn of: Noumea closeorum W.B. Rudman, 1986 - (CHROMODORIDIDAE)
- closei, Limatula closei C. Hedley, 1916 - syn of: Limatula hodgsoni (E.A. Smith, 1907) - (LIMIDAE)
- closeli, Septa closeli (A.G. Beu, 1987) - (RANELLIDAE)
- closeli, Cymatium closeli A.G. Beu, 1987 - syn of: Septa closeli (A.G. Beu, 1987) - (RANELLIDAE)
- closeorum, Noumea closeorum W.B. Rudman, 1986 - (CHROMODORIDIDAE)
- Closia, Genus Closia J.E. Gray, 1857 (MARGINELLIDAE)
- Clossoannaria, syn of: Genus Kuphus J.É. Guettard, 1770 (TEREDINIDAE)
- Clossonaria, syn of: Genus Kuphus J.É. Guettard, 1770 (TEREDINIDAE)
- closta, Micropontica closta O. Böttger, 1881 - (CLAUSILIIDAE)
- closter, Fusinus closter R.A. Philippi, 1850 - syn of: Fusinus ansatus (J.F. Gmelin, 1791) - (FASCIOLARIIDAE)
- closter, Fusus closter R.A. Philippi, 1850 - syn of: Fusinus ansatus (J.F. Gmelin, 1791) - (FASCIOLARIIDAE)
- closterion, Gemmula closterion A.V. Sysoev, 1997 - (TURRIDAE)
- Closteriscus, Genus Closteriscus Meek, 1876 † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Closteroides, Genus Closteroides Tomlin, 1929 † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- closteroides, Tricoloceras closteroides (Etheridge, 1904 †) - (PTYCHOCERATIDAE) (FOSSIL)
- closteroides, Ptychoceras closteroides Etheridge, 1904 † - syn of: Tricoloceras closteroides (Etheridge, 1904 †) - (PTYCHOCERATIDAE) (FOSSIL)
- Clostophis, Genus Clostophis W.H. Benson, 1860 (DIPLOMMATINIDAE)
- clotbeyi, Alectryonia clotbeyi L.M.D. Bellardi, 1854 † - (OSTREIDAE) (FOSSIL)
- Clotha, syn of: Genus Hiatella L.A.G. d'A. Bosc, 1801 (HIATELLIDAE)
- clotho, Ampelita clotho A.E.J. Férussac - (ACAVIDAE)
- clotho, Scenella clotho Walcott, 1912 † - syn of: Stenotheca clotho (Walcott, 1912 †) - (SCENELLIDAE) (FOSSIL)
- clotho, Stenotheca clotho (Walcott, 1912 †) - (STENOTHECIDAE) (FOSSIL)
- Clotho, syn of: Genus Ungulina L.A.G. d'A. Bosc, 1801 (UNGULINIDAE)
- clothonis, Paraclathurella clothonis C. Hedley, 1922 - (CLATHURELLIDAE)
- cloti, Corbicula cloti P.M. Pallary, 1909 - syn of: Corbicula fluminalis (O.F. Müller, 1774) - (CYRENIDAE)
- cloudi, Boreoceras cloudi (Miller & Youngquist, 1947 †) - (COLUMBITIDAE) (FOSSIL)
- cloudi, Neoglyphioceras cloudi Miller & Youngquist, 1948 † - syn of: Pachylyroceras cloudi (Miller & Youngquist, 1948 †) - (GONIATITIDAE) (FOSSIL)
- cloudi, Pachylyroceras cloudi (Miller & Youngquist, 1948 †) - (NEOGLYPHIOCERATIDAE) (FOSSIL)
- Cloudia, Genus Cloudia Knight , 1947 † (CYRTOLITIDAE) (FOSSIL)
- clouei, Brachioteuthis clouei A. de Rochebrune, 1884 - syn of: Brachioteuthis riisei (J.J.S. Steenstrup, 1882) - (BRACHIOTEUTHIDAE)
- clouei, Hiatula clouei (V. Bertin, 1880) - (PSAMMOBIIDAE)
- clouei, Sanguinolaria clouei V. Bertin, 1880 - syn of: Hiatula clouei (V. Bertin, 1880) - (PSAMMOBIIDAE)
- clouei, Leiostracus clouei L. Pfeiffer, 1857 - (SIMPULOPSIDAE)
- cloughi, Clathronema cloughi Blodgett, 1992 † - (LOXONEMATIDAE) (FOSSIL)
- cloughtonensis, Quenstedtia cloughtonensis L.R. Cox & W.J. Arkell, 1948 † - (QUENSTEDTIIDAE) (FOSSIL)
- Cloughtonia, Subgenus Microschiza (Cloughtonia) Hudleston, 1882 † (PSEUDOMELANIIDAE) (FOSSIL)
- clourtessolei, Ekaterodonta clourtessolei Babin 1982 † - (DIMYIDAE) (FOSSIL)
- clouthianus, Cyclophorus clouthianus O.F. von Möllendorff, 1881 - (CYCLOPHORIDAE)
- cloveri, Lautoconus cloveri (J.G. Walls, 1978) - (CONIDAE)
- cloveri, Cirsotrema cloveri L.G. Brown, 2002 - (EPITONIIDAE)
- cloveri, Benimakia cloveri M.A. Snyder & G.J. Vermeij, 2008 - (FASCIOLARIIDAE)
- cloveri, Latirus cloveri M.A. Snyder, 2003 - syn of: Fusolatirus suduirauti (K. Fraussen, 2003) - (FASCIOLARIIDAE)
- cloveri, Marginella cloveri E. de C. Rios & H.R. Matthews, 1972 - (MARGINELLIDAE)
- cloveri, Ziba cloveri (W.O. Cernohorsky, 1971) - (MITRIDAE)
- cloveri, Chicoreus cloveri (R. Houart, 1985) - (MURICIDAE)
- cloveri, Triplex cloveri R. Houart, 1985 - syn of: Chicoreus cloveri (R. Houart, 1985) - (MURICIDAE)
- cloveri purpurea, Marginella cloveri purpurea T. Cossignani, 2006 - syn of: Marginella purpurea T. Cossignani, 2006 - (MARGINELLIDAE)
- cloveriana, Cryptospira cloveriana A. Wakefield, 2010 - (MARGINELLIDAE)
- cloveriana, Indolyria cloveriana (C.S. Weaver, 1963) - (VOLUTIDAE)
- cloveriana gabryae, Indolyria cloveriana gabryae (G.T. Poppe, 1991) - (VOLUTIDAE)
- clowi, Dunveganoceras clowi Warren & Stelck, 1955 † - (ACANTHOCERATIDAE) (FOSSIL)
- Clunaculum, Genus Clunaculum W.H. Dall, 1899 (SOLECURTIDAE)
- clupeispina, Maoritomella clupeispina R.N. Kilburn, 1986 - (BORSONIIDAE)
- Clupibankia, syn of: Genus Bankia J.E. Gray, 1842 (TEREDINIDAE)
- Cluthoceras, Genus Cluthoceras Currie , 1954 † (MUENSTEROCERATIDAE) (FOSSIL)
- clydaniona, Yoldia clydaniona D.T. Dockery, 1982 † - (YOLDIIDAE) (FOSSIL)
- clydense, Burroceras clydense Cobban, Hook & J. Kennedy, 1989 † - (ACANTHOCERATIDAE) (FOSSIL)
- clydense, Buroceras clydense Cobban, Hook & J. Kennedy, 1989 † - (KOSSMATICERATIDAE) (FOSSIL)
- clydense, Tainoceras clydense Miller & Kemp, 1947 † - (TAINOCERATIDAE) (FOSSIL)
- clyderoperi, Muusoctopus clyderoperi (B.J. O'Shea, 1999) - (ENTEROCTOPODIDAE)
- Clydomphalites, Genus Clydomphalites Arkell, 1952 † (CLYDONICERATIDAE) (FOSSIL)
- Clydonacme, Subgenus Humboldtiana (Clydonacme) F.G. Thompson, 2006 (HUMBOLDTIANIDAE)
- CLYDONAUTILIDAE Hyatt in Zittel, 1900 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-NAUTILIDA [Order]-CLYDONAUTILOIDEA [Superfamily]) (FOSSIL)
- Clydonautilus, Genus Clydonautilus Mojsisovics, 1882 † (CLYDONAUTILIDAE) (FOSSIL)
- clydonia, Splendrillia clydonia (J.C. Melvill & R. Standen, 1901) - (DRILLIIDAE)
- Clydoniceras, Genus Clydoniceras Blake, 1905 † (CLYDONICERATIDAE) (FOSSIL)
- CLYDONICERATIDAE Buckman, 1924 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-STEPHANOCERATOIDEA [Superfamily]) (FOSSIL)
- clydonigera, Pleuroxia clydonigera R. Tate, 1894 - (CAMAENIDAE)
- clydoniona, Yoldia clydoniona D.T. Dockery, 1982 † - (YOLDIIDAE) (FOSSIL)
- Clydonites, Genus Clydonites Hauer , 1860 † (CLYDONITIDAE) (FOSSIL)
- CLYDONITIDAE Mojsisovics, 1879 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-CLYDONITOIDEA [Superfamily]) (FOSSIL)
- Clydonochilus, Genus Clydonochilus P. Fischer, 1890 (TROCHIDAE)
- Clydonopoma, Genus Clydonopoma H.A. Pilsbry, 1933 (POMATIIDAE)
- Clydonopoma, syn of: Subgenus Chondropoma (Chondropomium) J. Henderson & P. Bartsch, 1920 (POMATIIDAE)
- clydonus, Nodipecten clydonus W.P. Woodring, 1982 † - syn of: Nodipecten colinensis F. Hodson & F. Hodson, 1927 † - (PECTINIDAE) (FOSSIL)
- clydosa, Semele clydosa F.R. Bernard, 1983 - syn of: Semele sowerbyi G.W. Tryon, 1869 - (SEMELIDAE)
- clymene, Nautilinus clymene (R.J. Shuttleworth, 1852) - (PLANORBIDAE)
- clymene, Styloptygma clymene J.C. Melvill, 1918 - (PYRAMIDELLIDAE)
- clymene, Pleurotoma clymene W.H. Dall, 1918 - (TURRIDAE)
- Clymenia, Genus Clymenia Münster, 1834 (CLYMENIIDAE) (FOSSIL)
- clymeniae, Vetupraeca clymeniae (Beushausen, 1895 †) - (PRAECARDIIDAE) (FOSSIL)
- clymeniaeformis, Costaclymenia clymeniaeformis (G.G. Münster, 1839 †) - (COSTACLYMENIIDAE) (FOSSIL)
- clymeniaeformis, Goniatites clymeniaeformis G.G. Münster, 1839 † - syn of: Costaclymenia clymeniaeformis (G.G. Münster, 1839 †) - (GONIATITIDAE) (FOSSIL)
- CLYMENIIDA (UNASSIGNED) - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CLYMENIIDA [Order]) (FOSSIL)
- CLYMENIIDAE Edwards, 1849 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CLYMENIIDA [Order]-CLYMENIOIDEA [Superfamily]) (FOSSIL)
- clymenioides, Straparollus clymenioides J.W. Hall, 1860 † - (EUOMPHALIDAE) (FOSSIL)
- clymenioides, Phenacoceras clymenioides Schindewolf, 1923 † - (PHENACOCERATIDAE) (FOSSIL)
- Clymenites, syn of: Genus Clymenia Münster, 1834 (CLYMENIIDAE) (FOSSIL)
- Clymenoceras, Genus Clymenoceras Schindewolf, 1938 † (PHENACOCERATIDAE) (FOSSIL)
- Clymenonautilus, Genus Clymenonautilus Hyatt in Zittel, 1900 † (SYRINGONAUTILIDAE) (FOSSIL)
- clypaea, Caracollina clypaea P.M. Pallary, 1921 - syn of: Caracollina lenticula (A. Michaud, 1831) - (TRISSEXODONTIDAE)
- clypea, Patella clypea T. Brown, 1827 - syn of: Testudinalia testudinalis (Müller, 1776) - (PATELLIDAE)
- clypealoides, Tragodesmoceras clypealoides (Leonhard, 1897 †) - (MUNIERICERATIDAE) (FOSSIL)
- clypeaster, Nacella clypeaster R.P. Lesson, 1831 - syn of: Nacella clypeater (R.P. Lesson, 1831) - (NACELLIDAE)
- Clypeastericola, Genus Clypeastericola A. Warén, 1994 (EULIMIDAE)
- clypeastericola, Clypeastericola clypeastericola (T. Habe, 1976) - (EULIMIDAE)
- clypeata, Lucapinella clypeata (J.P.S. Grateloup, 1828 †) - (FISSURELLIDAE) (FOSSIL)
- clypeata, Entomella clypeata (J.B.P.A. Lamarck, 1802 †) - (FISSURELLIDAE) (FOSSIL)
- clypeata tapina, Lucapinella clypeata tapina (A. De Gregorio, 1884 †) - (FISSURELLIDAE) (FOSSIL)
- clypeater, Nacella clypeater (R.P. Lesson, 1831) - (NACELLIDAE)
- clypeater, Patella clypeater R.P. Lesson, 1831 - syn of: Nacella clypeater (R.P. Lesson, 1831) - (PATELLIDAE)
- clypeatum, Proscutum clypeatum A.E.M. Cossmann, 1888 † - (LOTTIIDAE) (FOSSIL)
- clypeatum, Bolloceras clypeatum (Barrande, 1877 †) - (NOTHOCERATIDAE) (FOSSIL)
- clypeatum, Phragmoceras clypeatum Barrande, 1877 † - syn of: Bolloceras clypeatum (Barrande, 1877 †) - (PHRAGMOCERATIDAE) (FOSSIL)
- clypeatus, Pernopecten clypeatus Newell, 1938 † - (PERNOPECTINIDAE) (FOSSIL)
- clypeiformis, Craspedodiscus clypeiformis (J.W. Judd, 1867 †) - (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- clypeiformis, Saynella clypeiformis (A.V.M.D. D'Orbigny, 1841 †) - (LEOPOLDIDAE) (FOSSIL)
- Clypeoceras, Genus Clypeoceras Smith , 1913 † (CLYPEOCERATIDAE) (FOSSIL)
- CLYPEOCERATIDAE Waterhouse, 1996 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-MEEKOCERATOIDEA [Superfamily]) (FOSSIL)
- Clypeoceratoides, Genus Clypeoceratoides Dagis & Ermakova, 1990 † (PROPTYCHITIDAE) (FOSSIL)
- Clypeola, syn of: Genus Sigapatella R.P. Lesson, 1830 (CALYPTRAEIDAE)
- Clypeola, syn of: Genus Sigapatella R.P. Lesson, 1830 (CALYPTRAEIDAE)
- clypeolum, Trochita clypeolum L.A. Reeve, 1859 - syn of: Trochita pileolus d'Orbigny, 1841 - (CALYPTRAEIDAE)
- Clypeolum, Subgenus Neritina (Clypeolum) C.A. Récluz, 1842 (NERITIDAE)
- clypeolum, Septaria clypeolum (C.A. Récluz, 1842) - (NERITIDAE)
- Clypeomorus, Genus Clypeomorus F.P. Jousseaume, 1888 (CERITHIIDAE)
- clypeomorus, Clypeomorus clypeomorus F.P. Jousseaume, 1888 - syn of: Clypeomorus bifasciata (G.B. II Sowerby, 1855) - (CERITHIIDAE)
- CLYPEOSECTIDAE - syn of Family: LEPETODRILIDAE
- Clypeosectus, Genus Clypeosectus J.H. McLean, 1989 (LEPETODRILIDAE)
- Clypeostoma, Genus Clypeostoma D.G. Herbert, 2012 (CHILODONTIDAE)
- clypeus, Cerithium clypeus W.H. Hudleston, 1889 † - (CERITHIIDAE) (FOSSIL)
- clypeus, Dyakia clypeus (A. Mousson, 1857) - (DYAKIIDAE)
- clypeus, Emarginula clypeus A. Adams, 1852 - (FISSURELLIDAE)
- clypeus, Fissurella clypeus G.B. I Sowerby, 1835 - syn of: Fissurella peruviana J.B.P.A. Lamarck, 1822 - (FISSURELLIDAE)
- clypeus, Tectura clypeus T. Brown, 1827 - syn of: Testudinalia testudinalis (Müller, 1776) - (LOTTIIDAE)
- clypeus, Sinuconus clypeus Yü, 1979 † - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- clypeus, Kenzieana clypeus Barrande, 1881 † - syn of: Kenzieana cardiopsis (Barrande, 1881 †) - (SPANILIDAE) (FOSSIL)
- clypeus, Hebetoxyites clypeus Buckman † - (STRIGOCERATIDAE) (FOSSIL)
- Clypeus, syn of: Genus Trimusculus A. Schmidt, 1818 (TRIMUSCULIDAE)
- clypeus, Dolichupis clypeus L. Dolin, 1991 - (TRIVIIDAE)
- clypeus, Trochotoma clypeus Terquem, 1855 † - (TROCHOTOMIDAE) (FOSSIL)
- Clypidella, Subgenus Fissurella (Clypidella) W.J. Swainson, 1840 (FISSURELLIDAE)
- clypidellaeformis, Tectisumen clypidellaeformis (H.H. Suter, 1908) - (LEPETELLIDAE)
- Clypidina, Genus Clypidina J.E. Gray, 1847 (FISSURELLIDAE)
- Clypites, Genus Clypites Waagen , 1895 † (HEDENSTROEMIIDAE) (FOSSIL)
- Clystaxis, syn of: Genus Cylichna S.L. Lovén, 1846 (CYLICHNIDAE)
- clythia, Vaugonia clythia (A.V.M.D. D'Orbigny, 1850 †) - (MYOPHORELLIDAE) (FOSSIL)
- clytia, Pseudonerinea clytia (A.V.M.D. D'Orbigny, 1852 †) - (CERITELLIDAE) (FOSSIL)
- Clytia, syn of: Genus Partula A.E.J. Férussac, 1821 (PARTULIDAE)
- Clytoceras, Genus Clytoceras Ulrich, Foerste, Miller & Flower, 1942 † (ESTONIOCERATIDAE) (FOSSIL)
- clytospira, Leptoconus milneedwardsi clytospira (J.C. Melvill & R. Standen, 1899) - (CONIDAE)
- clytotropis, Ancistrosyrinx clytotropis (E.R. Sykes, 1906) - (COCHLESPIRIDAE)
- Clytropelta, syn of: Genus Deroceras C.S. Rafinesque, 1820 (AGRIOLIMACIDAE)
- cmadoritinctum, Parvamussium cmadoritinctum J.T. Kuroda, 1931 - syn of: Parvamussium scitulum (Smith, 1885) - (PROPEAMUSSIIDAE)
- cnemopsis, Orygoceras cnemopsis Š. Brusina, 1892 † - (HYDROBIIDAE) (FOSSIL)
- cnephaea, Clathurella cnephaea J.C. Melvill & R. Standen, 1896 - syn of: Pseudodaphnella cnephaea (J.C. Melvill & R. Standen, 1896) - (CLATHURELLIDAE)
- cnephaea, Pseudodaphnella cnephaea (J.C. Melvill & R. Standen, 1896) - (RAPHITOMIDAE)
- Cnesterium, Subgenus Yoldia (Cnesterium) Dall, 1898 † (YOLDIIDAE) (FOSSIL)
- Cnesterium, syn of: Genus Yoldia H.P.C. Møller, 1842 (YOLDIIDAE)
- Cnesticystis, Subgenus Microcystis (Cnesticystis) F.C. Baker, 1933 (EUCONULIDAE)
- Cnestriella, Genus Cnestriella Tashiro & Otsuka, 1980 † (NUCULIDA (UNASSIGNED)) (FOSSIL)
- cnestum, Uromitra cnestum J. Gardner, 1937 † - (COSTELLARIIDAE) (FOSSIL)
- cnidevorans, Dondersia cnidevorans L. Salvini-Plawén, 1978 - (DONDERSIIDAE)
- cnidicaulis, Latipes cnidicaulis (H.B. Baker, 1926) - (VERONICELLIDAE)
- cnidophilum, Calliostoma cnidophilum J.F. Quinn, 1992 - (CALLIOSTOMATIDAE)
- Cnisma, Genus Cnisma Mayer, 1868 † (LIMOPSIDAE) (FOSSIL)
- cnismatopleura, Buccinum cnismatopleura (W.H. Dall, 1919) - (BUCCINIDAE)
- cnismatum, Buccinum cnismatum W.H. Dall, 1907 - (BUCCINIDAE)
- cnismatum chibanum, Buccinum cnismatum chibanum J.T. Kuroda, 1964 - (BUCCINIDAE)
- cnissodus, Chicoreus cnissodus (F.M. Euthyme, 1889) - (MURICIDAE)
- cnissodus, Murex cnissodus F.M. Euthyme, 1889 - syn of: Chicoreus cnissodus (F.M. Euthyme, 1889) - (MURICIDAE)
- cnissodus ceylonensis, Chicoreus cnissodus ceylonensis R. Houart, 2015 - syn of: Chicoreus cnissodus (F.M. Euthyme, 1889) - (MURICIDAE)
- cnodax, Coriophora cnodax (F.P. Jousseaume, 1884) - (TRIPHORIDAE)
- cnodax, Mastonia cnodax (F.P. Jousseaume, 1884) - syn of: Coriophora cnodax (F.P. Jousseaume, 1884) - (TRIPHORIDAE)
- coa, Albinaria coa (O. Böttger, 1889) - (CLAUSILIIDAE)
- coa, Pseudamnicola coa Willmann, 1981 † - (HYDROBIIDAE) (FOSSIL)
- coacta, Koloonella coacta (R.B. Watson, 1886) - (MURCHISONELLIDAE)
- coactiliata, Epiphragmophora coactiliata A.E.J. Férussac, 1838 - syn of: Trichodiscina coactiliata (A.E.J. Férussac, 1838) - (EPIPHRAGMOPHORIDAE)
- coactiliata, Helix coactiliata A.E.J. Férussac, 1838 - syn of: Trichodiscina coactiliata (A.E.J. Férussac, 1838) - (HELICIDAE)
- coactiliata, Trichodiscina coactiliata (A.E.J. Férussac, 1838) - (XANTHONYCHIDAE)
- coactiliata suturalis, Patula coactiliata suturalis L. Pfeiffer, 1846 - syn of: Trichodiscina suturalis (L. Pfeiffer, 1846) - (DISCIDAE)
- coactum, Chrysoceras coactum P.A. Zhuravleva, 1972 † - syn of: Chrysoceras tumidum (P.A. Zhuravleva, 1972 †) - (DISCOSORIDA (unassigned)) (FOSSIL)
- Coactunio, Genus Coactunio Van Damme & Bogan, 2015 † (UNIONIDAE) (FOSSIL)
- coaequata, Melanopsis fossilis coaequata Handmann, 1887 † - (MELANOPSIDAE) (FOSSIL)
- coagulata, Naninia coagulata (L. Pfeiffer) - (ARIOPHANTIDAE)
- coagulatus, Scutalus coagulatus L.A. Reeve, 1849 - syn of: Scutalus versicolor H.A. Pilsbry, 1897 - (BULIMULIDAE)
- coahuilae, Juturnia coahuilae (D.W. Taylor, 1966) - (COCHLIOPIDAE)
- coahuilaensis, Spathites coahuilaensis (Jones, 1938 †) - (ACANTHOCERATIDAE) (FOSSIL)
- coahuilenis, Coelostemma coahuilenis P. Bartsch, 1906 - (UROCOPTIDAE)
- coahuilense, Bitaunioceras coahuilense Miller, 1944 † - (SPYROCERATIDAE) (FOSSIL)
- coahuilensis, Exogyra arietina coahuilensis Jones, 1938 † - (GRYPHAEIDAE) (FOSSIL)
- coahuilensis, Maderia coahuilensis Imlay, 1940 † - (OLCOSTEPHANIDAE) (FOSSIL)
- coahuilensis, Apertaxis coahuilensis (P. Bartsch, 1906) - (UROCOPTIDAE)
- coahuilensis, Haplocion coahuilensis (W.G. Binney, 1865) - (UROCOPTIDAE)
- Coahuilites, Genus Coahuilites Böse , 1928 † (SPHENODISCIDAE) (FOSSIL)
- Coahuilix, Genus Coahuilix J.D. Taylor, 1966 (COCHLIOPIDAE)
- Coalcomana, Genus Coalcomana Harris & Hodson, 1922 † (CAPRINULOIDEIDAE) (FOSSIL)
- coalescens, Stylonema coalescens J. Perner, 1907 † - syn of: Stylonema potens J. Perner, 1907 † - (LOXONEMATIDAE) (FOSSIL)
- coalescens, Turris disjuncta coalescens M.A. Peyrot, 1931 † - (TURRIDAE) (FOSSIL)
- coalingense, Gaudryceras coalingense de Grossouvre 1894 † - (GAUDRYCERATIDAE) (FOSSIL)
- coalingensis, Pachydiscus coalingensis Anderson 1958 † - (DESMOCERATIDAE) (FOSSIL)
- coalingensis, Clathrodrillia coalingensis (R. Arnold, 1910 †) - (DRILLIIDAE) (FOSSIL)
- coalingensis, Glycymeris coalingensis R. Arnold, 1910 - syn of: Glycymeris septentrionalis (A.T. von Middendorff, 1849) - (GLYCYMERIDIDAE)
- coalingensis, Mytiloconcha coalingensis R. Arnold, 1909 † - syn of: Crenomytilus grayanus (R.W. Dunker, 1853) - (MYTILIDAE) (FOSSIL)
- coalingensis, Crenomytilus coalingensis T. Soot-Ryen, 1955 † - syn of: Arcuatula sootryeni J.D. Stilwell & Zinsmeister, 1992 † - (MYTILIDAE) (FOSSIL)
- coalingensis, Caesia coalingensis R. Arnold, 1909 † - (NASSARIIDAE) (FOSSIL)
- coalingensis, Gonidea coalingensis R. Arnold, 1909 - syn of: Gonidea angulata (I. Lea, 1838) - (UNIONIDAE)
- coalingensis cooperi, Gonidea coalingensis cooperi R. Arnold, 1909 - syn of: Gonidea angulata (I. Lea, 1838) - (UNIONIDAE)
- Coalingodea, Genus Coalingodea Durham, 1942 † (PURPURINIDAE) (FOSSIL)
- coalita, Galeomma coalita S. Gofas, 1991 - (GALEOMMATIDAE)
- coalvillensis, Craginia coalvillensis (F.B. Meek †) - (TURRITELLIDAE) (FOSSIL)
- coangustatus, Arcestes coangustatus J. Von Hauer, 1860 † - syn of: Sphingites coangustatus (J. Von Hauer, 1860 †) - (ARCESTIDAE) (FOSSIL)
- coangustatus, Theodoxus deperditus coangustatus (J. Almera, 1894 †) - (NERITIDAE) (FOSSIL)
- coangustatus, Sphingites coangustatus (J. Von Hauer, 1860 †) - (SPHINGITIDAE) (FOSSIL)
- coangustus, Schartymites coangustus Ruzhencev & Bogoslovskaya, 1978 † - (STENOGLAPHYRITIDAE) (FOSSIL)
- coani, Rochefortia coani P.H. Valentich-Scott, 1998 - (LASAEIDAE)
- coani, Limea coani (F.R. Bernard, 1988) - (LIMIDAE)
- coani, Benthobulbus coani (L.N. Marincovich, 1975) - (NATICIDAE)
- coani, Choristes coani L.N. Marincovich, 1975 - syn of: Benthobulbus coani (L.N. Marincovich, 1975) - (NATICIDAE)
- coani, Amauropsis coani L.N. Marincovich, 1975 - syn of: Benthobulbus coani (L.N. Marincovich, 1975) - (NATICIDAE)
- coani, Moerella coani A.M. Keen, 1971 - (TELLINIDAE)
- coani, Macoma coani A.I. Kafanov & K.A. Lutaenko, 1999 - (TELLINIDAE)
- Coania, Genus Coania P.H. Valentich-Scott & C.C. Skoglund, 2010 (PANDORIDAE)
- Coanollonia, Genus Coanollonia Woodring, 1928 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- coanscotti, Austroneaera coanscotti M. Huber, 2010 - (CUSPIDARIIDAE)
- Coanyax, Genus Coanyax M. Huber, Langleit & Kreipl, 2015 (TELLINIDAE)
- coapta, Loxonema coapta J.W. Hall, 1876 † - (LOXONEMATIDAE) (FOSSIL)
- coarctaca, Prosimnia coarctaca F.A. Schilder, 1941 - syn of: Prosimnia semperi (H.C. Weinkauff, 1881) - (OVULIDAE)
- coarctaca, Primovula coarctaca F.A. Schilder, 1941 - syn of: Prosimnia semperi (H.C. Weinkauff, 1881) - (OVULIDAE)
- coarctata, Leptoplax coarctata (G.B. II Sowerby, 1841) - (ACANTHOCHITONIDAE)
- coarctata, Acteocina coarctata A. Adams, 1850 - syn of: Truncacteocina coarctata (A. Adams, 1850) - (ACTEOCINIDAE)
- coarctata, Latiala coarctata (H.B. Geinitz, 1842 †) - (APORRHAIDAE) (FOSSIL)
- coarctata, Bulla coarctata A. Adams, 1850 - syn of: Truncacteocina coarctata (A. Adams, 1850) - (BULLIDAE)
- coarctata, Cypraecassis coarctata (Sowerby, 1825) - (CASSIDAE)
- coarctata, Laciniaria plicata coarctata A. Schmidt, 1868 - (CLAUSILIIDAE)
- coarctata, Truncacteocina coarctata (A. Adams, 1850) - (CYLICHNIDAE)
- coarctata, Apula coarctata (E. Klein, 1853 †) - (ELONIDAE) (FOSSIL)
- coarctata, Acirsa coarctata (J.G. Jeffreys, 1884) - (EPITONIIDAE)
- coarctata, Acirsa coarctata F. Nordsieck, 1972 - syn of: Acirsa subdecussata (F.J. Cantraine, 1835) - (EPITONIIDAE)
- coarctata, Pseudacirsa coarctata J.G. Jeffreys, 1884 - syn of: Acirsa coarctata (J.G. Jeffreys, 1884) - (EPITONIIDAE)
- coarctata, Fissurella coarctata P.P. King, 1832 - (FISSURELLIDAE)
- coarctata, Gastrochaena coarctata G.P. Deshayes, 1856 † - (GASTROCHAENIDAE) (FOSSIL)
- coarctata, Helix coarctata A.E.J. Férussac, 1839 - syn of: Sphaerospira fraseri (E. Griffith & E. Pidgeon, 1833) - (HELICIDAE)
- coarctata, Stenopylis coarctata (O.F. von Möllendorff, 1894) - (HELICODISCIDAE)
- coarctata, Kellia coarctata S.V. Wood, 1851 - syn of: Montacuta phascolionis P. Dautzenberg & H. Fischer, 1925 - (KELLIIDAE)
- coarctata, Littorina coarctata G.O. Sars, 1878 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- coarctata, Mangelia coarctata (E. Forbes, 1840) - (MANGELIIDAE)
- coarctata, Nebularia coarctata L.A. Reeve, 1844 - (MITRIDAE)
- coarctata, Phascoliophila coarctata (Wood, 1840 †) - (MONTACUTIDAE) (FOSSIL)
- coarctata, Ebala coarctata (P. Dautzenberg, 1889) - (MURCHISONELLIDAE)
- coarctata, Catazone coarctata J. Perner, 1907 † - syn of: Catazone latona J. Perner, 1907 † - (MURCHISONIIDAE) (FOSSIL)
- coarctata, Gregariella coarctata (Carpenter, 1857) - (MYTILIDAE)
- coarctata, Eunaticina coarctata L.A. Reeve, 1864 - syn of: Eunaticina papilla (J.F. Gmelin, 1791) - (NATICIDAE)
- coarctata, Ostrea coarctata I. von Born, 1778 - syn of: Flexopecten flexuosus (G.S. Poli, 1795) - (OSTREIDAE)
- coarctata, Hiatavolva coarctata (G.B. II Sowerby in A. Adams & L.A. Reeve, 1848) - (OVULIDAE)
- coarctata, Pseudomelania coarctata (Deslongchamps, 1842 †) - (PSEUDOMELANIIDAE) (FOSSIL)
- coarctata, Ondina coarctata (G.O. Sars, 1878) - (PYRAMIDELLIDAE)
- coarctata, Spiralinella spiralis coarctata (J.T. Marshall, 1891) - (PYRAMIDELLIDAE)
- coarctata, Rostellaria coarctata H.B. Geinitz, 1842 † - syn of: Latiala coarctata (H.B. Geinitz, 1842 †) - (ROSTELLARIIDAE) (FOSSIL)
- coarctata, Cumingia lamellosa coarctata G.B. I Sowerby, 1833 - (SEMELIDAE)
- coarctata, Apolymetis coarctata (R.A. Philippi, 1845) - (TELLINIDAE)
- coarctata, Leporimetis coarctata R.A. Philippi, 1845 - syn of: Apolymetis coarctata (R.A. Philippi, 1845) - (TELLINIDAE)
- coarctata, Turbinella coarctata O.G. Michelotti, 1847 † - syn of: Latirus coarctatus (O.G. Michelotti, 1847 †) - (TURBINELLIDAE) (FOSSIL)
- coarctata, Pleurotoma coarctata E. Forbes, 1840 - syn of: Mangelia coarctata (E. Forbes, 1840) - (TURRIDAE)
- coarctata, Unio coarctata J.B.P.A. Lamarck, 1819 - syn of: Unio abbevillensis I. Lea, 1857 - (UNIONIDAE)
- coarctata aquitanica, Ondina coarctata aquitanica F. Nordsieck, 1972 - (PYRAMIDELLIDAE)
- coarctata distantespirata, Pseudacirsa coarctata distantespirata F. Nordsieck, 1972 - syn of: Acirsa subdecussata (F.J. Cantraine, 1835) - (EPITONIIDAE)
- coarctata distantespirata, Acirsa coarctata distantespirata F. Nordsieck, 1972 - syn of: Acirsa subdecussata (F.J. Cantraine, 1835) - (EPITONIIDAE)
- Coarctatio, syn of: Genus Stenopylis H.C. Fulton, 1914 (HELICODISCIDAE)
- coarctatum, Busycoarctum coarctatum (G.B. I Sowerby, 1825) - (BUSYCONIDAE)
- coarctatum, Cerithium coarctatum G.B. II Sowerby, 1866 - syn of: Colina macrostoma (R.B. Hinds, 1844) - (CERITHIIDAE)
- coarctatum, Alocolytoceras coarctatum Pompeckj, 1896 † - (LYTOCERATIDAE) (FOSSIL)
- coarctatum, Ovultm coarctatum G.B. II Sowerby in A. Adams & L.A. Reeve, 1848 - syn of: Hiatavolva coarctata (G.B. II Sowerby in A. Adams & L.A. Reeve, 1848) - (OVULIDAE)
- coarctatum, Campeloma coarctatum H.C. Lea, 1844 - (VIVIPARIDAE)
- coarctatus, Notoplax coarctatus G.B. II Sowerby, 1841 - syn of: Leptoplax coarctata (G.B. II Sowerby, 1841) - (ACANTHOCHITONIDAE)
- coarctatus, Drymaeus coarctatus (L. Pfeiffer, 1845) - (BULIMULIDAE)
- coarctatus, Latirus coarctatus (O.G. Michelotti, 1847 †) - (FASCIOLARIIDAE) (FOSSIL)
- coarctatus, Radiodiscus coarctatus M.I. Hylton-Scott, 1979 - (HELICODISCIDAE)
- coarctatus, Flexopecten coarctatus (I. von Born, 1778) - (PECTINIDAE)
- coarctatus, Azorinus coarctatus (J.F. Gmelin, 1791) - (SOLECURTIDAE)
- coarctatus, Solen coarctatus J.F. Gmelin, 1791 - syn of: Azorinus coarctatus (J.F. Gmelin, 1791) - (SOLENIDAE)
- coarctica, Gastrochaena coarctica G.P. Deshayes, 1856 † - syn of: Gastrochaena coarctata G.P. Deshayes, 1856 † - (GASTROCHAENIDAE) (FOSSIL)
- coarctica, Mioerycina coarctica (Wood, 1851 †) - (MONTACUTIDAE) (FOSSIL)
- coaretata, Cerion coaretata H.H. Beck, 1837 - (CERIONIDAE)
- coarguta, Quirella coarguta Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- coarta, Temertassetia coarta D. Korn & al., 2010 † - (TEMERTASSETIIDAE) (FOSSIL)
- coartata, Metafruticicola coartata A. Fuchs & F. Käufel, 1936 - (HYGROMIIDAE)
- coartata geminus, Metafruticicola coartata geminus A. Fuchs & F. Käufel, 1936 - (HYGROMIIDAE)
- coarti, Dentalium coarti P. Dautzenberg, 1891 - (DENTALIIDAE)
- coatesi, Ventrilia coatesi B.M. Landau, R.E. Petit & F. Da Silva, 2012 † - (CANCELLARIIDAE) (FOSSIL)
- coatesi, Neilsonia coatesi Peel, 2016 † - (GOSSELETINIDAE) (FOSSIL)
- coatesi, Barrettia coatesi (Chubb 1971) † - (HIPPURITIDAE) (FOSSIL)
- coatesi, Vaugonia coatesi Poulton, 1977 † - (MYOPHORELLIDAE) (FOSSIL)
- coatsi, Chlamys coatsi F.S. MacNeil, 1967 † - (PECTINIDAE) (FOSSIL)
- coatsiana, Lodderia coatsiana (J.C. Melvill & R. Standen, 1912) - (SKENEIDAE)
- coatsianum, Cyclostrema coatsianum J.C. Melvill & R. Standen, 1912 - syn of: Lodderia coatsiana (J.C. Melvill & R. Standen, 1912) - (LIOTIIDAE)
- coaxans, Polymesoda coaxans (J.F. Gmelin, 1791) - (CYRENIDAE)
- coaxans, Venus coaxans J.F. Gmelin, 1791 - syn of: Geloina erosa (J. Lightfoot, 1786) - (VENERIDAE)
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