- cuyama, Helminthoglypta cuyama G.D. Hanna & A.G. Smith, 1937 - (HELMINTHOGLYPTIDAE)
- cuyamacensis, Rothelix cuyamacensis (H.A. Pilsbry, 1895) - (HELMINTHOGLYPTIDAE)
- cuyana, Chilina cuyana D.E. Gutiérrez Gregoric, Ciocco & A. Rumi, 2014 - (CHILINIDAE)
- cuyana, Modiolopsis cuyana P. Sánchez, 1999 † - (MODIOMORPHIDAE) (FOSSIL)
- Cuyaniceras, Genus Cuyaniceras Leanza, 1945 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- cuyanus, Bostryx cuyanus L. Pfeiffer, 1867 - (BULIMULIDAE)
- cuyleri, Shumardites cuyleri Plummer & P.H. Scott, 1937 † - (SHUMARDITIDAE) (FOSSIL)
- cuyoensis, Cochlostyla cuyoensis L. Pfeiffer - (BRADYBAENIDAE)
- cuyoensis, Conus vidua cuyoensis F.Jr. Lorenz & J.P. Barbier, 2012 - (CONIDAE)
- cuyoensis contracta, Cochlostyla cuyoensis contracta W. Kobelt, 1911 - (BRADYBAENIDAE)
- cuyoensis subpallida, Cochlostyla cuyoensis subpallida P. Bartsch, 1932 - (BRADYBAENIDAE)
- Cuyopsis, Genus Cuyopsis Sanchez, 1999 † (PRAENUCULIDAE) (FOSSIL)
- cuyosae, Mitra cuyosae G.T. Poppe, 2008 - (MITRIDAE)
- cuyunchensis, Helcionella cuyunchensis Rusconi, 1952 † - syn of: Acevina cuyunchensis (Rusconi, 1952 †) - (HELCIONELLIDAE) (FOSSIL)
- cuyunchensis, Acevina cuyunchensis (Rusconi, 1952 †) - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- cuzcana, Happia cuzcana (R.A. Philippi, 1869) - (SCOLODONTIDAE)
- cuzcoensis, Drymaeus cuzcoensis (L.A. Reeve, 1849) - (BULIMULIDAE)
- cuzcoensis, Vermiculatus cuzcoensis (W.K. Weyrauch, 1967) - (BULIMULIDAE)
- cuzcoensis, Heleobia cuzcoensis (H.A. Pilsbry, 1911) - (COCHLIOPIDAE)
- cuzcoensis, Chondrothyrella cuzcoensis C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- cuzcoensis, Macroceramus cuzcoensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- cuzcoensis, Cochlodinella variegata cuzcoensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- cuzcoensis caroli, Chondrothyrella cuzcoensis caroli C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- cuzcoensis carolis, Chondrothyrella cuzcoensis carolis C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- cuzcoensis marasensis, Vermiculatus cuzcoensis marasensis (W.K. Weyrauch, 1967) - (BULIMULIDAE)
- cuzcoensis masarensis, Scutalus cuzcoensis masarensis W.K. Weyrauch, 1967 - syn of: Vermiculatus cuzcoensis marasensis (W.K. Weyrauch, 1967) - (BULIMULIDAE)
- cuzoensis, Macroceramus cuzoensis C. de la Torre & P. Bartsch, 2008 - syn of: Macroceramus cuzcoensis C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- cuzyensis, Aegopinella cuzyensis É.A.A. Locard, 1894 - syn of: Aegopinella nitens (A. Michaud, 1831) - (ZONITIDAE)
- cvijici, Bythinella cvijici P.S. Pavlovic, 1935 † - (BYTHINELLIDAE) (FOSSIL)
- cvijici, Melanopsis cvijici Š. Brusina, 1902 † - (MELANOPSIDAE) (FOSSIL)
- cvijici, Viviparus cvijici P.S. Pavlovic, 1932 † - (VIVIPARIDAE) (FOSSIL)
- cvitanovici, Illyricocongeria cvitanovici (Š. Brusina, 1907 †) - (DREISSENIDAE) (FOSSIL)
- cyacantha, Murex cyacantha G.B. II Sowerby, 1879 - syn of: Chicoreus virgineus (P.F. Röding, 1798) - (MURICIDAE)
- CYAMIIDAE G.O. Sars, 1878 - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-VENERIDA [Order]-CYAMIOIDEA [Superfamily])
- Cyamiocardium, Genus Cyamiocardium T. Soot-Ryen, 1951 (CYAMIIDAE)
- Cyamiomactra, Genus Cyamiomactra F. Bernard, 1897 (CYAMIIDAE)
- Cyamionema, syn of: Genus Kidderia W.H. Dall, 1876 (CYAMIIDAE)
- Cyamium, Genus Cyamium R.A. Philippi, 1845 (CYAMIIDAE)
- cyanae, Mitrella cyanae K. Monsecour & D. Monsecour, 2016 - (COLUMBELLIDAE)
- cyanantyx, Sabalimax cyanantyx S. Tillier & P. Bouchet, 1988 - (EUCONULIDAE)
- Cyane, syn of: Genus Arhecharax F.G. Thompson, 1980 (PROSERPINELLIDAE)
- cyanea, Philinopsis cyanea (E.C. Von Martens, 1879) - syn of: Philinopsis speciosa W.H. Pease, 1860 - (AGLAJIDAE)
- cyanea, Congeria cyanea P.J. Van Beneden, 1838 - syn of: Mytilopsis africana (P.J. Van Beneden, 1835) - (DREISSENIDAE)
- cyanea, Dreissena cyanea P.J. Van Beneden, 1838 - syn of: Mytilopsis africana (P.J. Van Beneden, 1835) - (DREISSENIDAE)
- cyanea, Octopus cyanea J.E. Gray, 1849 - (OCTOPODIDAE)
- cyanea, Patella cyanea R.P. Lesson, 1831 - (PATELLIDAE)
- cyanea, Elysia cyanea G. Mamo in A. Caruana Gatto, 1867 - syn of: Thuridilla hopei (J.B. Vérany, 1853) - (PLAKOBRANCHIDAE)
- cyanea, Sepiella cyanea C.W. Robson, 1924 - (SEPIIDAE)
- cyanea gracilis, Octopus cyanea gracilis C.W. Robson, 1929 - syn of: Octopus cyanea J.E. Gray, 1849 - (OCTOPODIDAE)
- Cyaneitapes, syn of: Genus Venerupis J.B.P.A. Lamarck, 1818 (VENERIDAE)
- cyanella, Facelina cyanella (J.P.Y. Couthouy in A.A. Gould, 1852) - (FACELINIDAE)
- cyaneomaculata, Siphonaria cyaneomaculata G.B. III Sowerby, 1906 - syn of: Siphonaria concinna G.B. I Sowerby, 1823 - (SIPHONARIIDAE)
- cyaneum, Aglaja cyaneum E.C. Von Martens, 1879 - syn of: Philinopsis speciosa W.H. Pease, 1860 - (AGLAJIDAE)
- cyaneum, Buccinum cyaneum J.G. Bruguière, 1792 - (BUCCINIDAE)
- cyaneum patulum, Buccinum cyaneum patulum J.G. Bruguière, 1792 - (BUCCINIDAE)
- cyaneus, Macaronapaeus cyaneus J.A. Albers, 1852 - syn of: Napaeus pruninus (A.A. Gould, 1848) - (ENIDAE)
- cyaneus, Bulinus cyaneus E. Pirajno, 1842 - syn of: Bulinus truncatus (J.V. Audouin, 1827) - (PLANORBIDAE)
- cyanobranchiata, Marionia cyanobranchiata (W.P.E.S. Rüppell & F.S. Leuckart, 1828) - (TRITONIIDAE)
- cyanocaudata, Haminoea cyanocaudata J. Heller & T.E. Thompson, 1983 - (HAMINOEIDAE)
- Cyanocyclas, Genus Cyanocyclas H.M.D. De Blainville, 1818 (CYRENIDAE)
- Cyanogaster, syn of: Genus Pleurobranchaea J.F. Meckel in S.F. Leue, 1813 (PLEUROBRANCHAEIDAE)
- cyanomarginata, Haminoea cyanomarginata J. Heller & T.E. Thompson, 1983 - (HAMINOEIDAE)
- Cyanoplax, Genus Cyanoplax H.A. Pilsbry, 1892 (LEPIDOCHITONIDAE)
- cyanostoma, Austroconus cyanostoma (A. Adams, 1855) - (CONIDAE)
- cyanostoma, Phos cyanostoma A. Adams, 1851 - (NASSARIIDAE)
- cyanostoma, Nerita cyanostoma P.M.A. Morelet, 1853 - syn of: Nerita insculpta C.A. Récluz, 1841 - (NERITIDAE)
- cyanostoma, Homorus cyanostoma (L. Pfeiffer, 1842) - (SUBULINIDAE)
- cyanostomus, Phos cyanostomus A. Adams, 1850 - syn of: Phos cyanostoma A. Adams, 1851 - (NASSARIIDAE)
- cyanosus, Callistochiton cyanosus W.H. Dall, 1919 - syn of: Callistochiton decoratus H.A. Pilsbry, 1893 ex Carpenter MS - (CALLISTOPLACIDAE)
- cyanozoaria, Oleacina cyanozoaria J. Gundlach in L. Pfeiffer, 1857 - (OLEACINIDAE)
- Cyanthopoma, Genus Cyanthopoma Rowson, 2010 (CYCLOPHORIDAE)
- cyatha, Phosinella cyatha (C.F. Laseron, 1956) - (RISSOINIDAE)
- cyathella, Cheilea equestris cyathella L.A. Reeve, 1858 - (HIPPONICIDAE)
- Cyathermia, Genus Cyathermia A. Warén & P. Bouchet, 1989 (NEOMPHALIDAE)
- CYATHERMIIDAE - syn of Family: NEOMPHALIDAE
- cyathinium, Platyceras cyathinium Lindström, 1884 † - syn of: Orthonychia enorme (Lindström, 1884 †) - (PLATYCERATIDAE) (FOSSIL)
- cyathinum, Platyceras cyathinum Lindström, 1884 † - syn of: Orthonychia enorme (Lindström, 1884 †) - (PLATYCERATIDAE) (FOSSIL)
- Cyathodonta, Genus Cyathodonta T.A. Conrad, 1849 (THRACIIDAE)
- cyathoides, Cadulus cyathoides S.G.A. Jaeckel, 1932 - (GADILIDAE)
- Cyathopoma, Genus Cyathopoma H.F. Blanford & W.T. Blanford, 1861 (CYCLOPHORIDAE)
- cyathula, Crassostrea cyathula (J.B.P.A. Lamarck, 1806 †) - (OSTREIDAE) (FOSSIL)
- cyathulum, Fissurella cyathulum L.A. Reeve, 1850 - (FISSURELLIDAE)
- cyathus, Vitrinoconus cyathus (L. Pfeiffer, 1845) - (TROCHOMORPHIDAE)
- cyathus attenuatus, Cadulus cyathus attenuatus T.A. de M. Monterosato, 1875 - syn of: Cadulus attenuatus T.A. de M. Monterosato, 1875 - (GADILIDAE)
- cybaea, Bathyarca cybaea C. Hedley, 1906 - (ARCIDAE)
- cybaea, Neptunea cybaea K. Fraussen & Y. Terryn, 2007 - (BUCCINIDAE)
- cybaea, Alopia lischkeana cybaea (M. von Kimakowicz, 1894) - (CLAUSILIIDAE)
- cybaea, Coriophora cybaea (S. Kosuge, 1963) - (TRIPHORIDAE)
- cybaea, Latitriphora cybaea (S. Kosuge, 1963) - syn of: Coriophora cybaea (S. Kosuge, 1963) - (TRIPHORIDAE)
- cybele, Cerodrillia cybele (H.A. Pilsbry & Lowe, 1932) - (DRILLIIDAE)
- cybele, Pyrgulopsis cybele R. Hershler & H.P. Liu, 2012 - (HYDROBIIDAE)
- cybele, Nevadotheca cybele (Walcott, 1905 †) - (HYOLITHIDAE) (FOSSIL)
- cybele, Coelocaulus cybele J. Perner, 1907 † - (MURCHISONIIDAE) (FOSSIL)
- cybele, Pterinopecten cybele (Barrande , 1881 †) - (PTERINOPECTINIDAE) (FOSSIL)
- cybele, Thiara cybele A.A. Gould, 1847 - syn of: Thiara amarula (C. Linnaeus, 1758) - (THIARIDAE)
- cybele nesiotes, Pterinopecten cybele nesiotes Kríž in Kríž & Serpagli, 1993 † - (PTERINOPECTINIDAE) (FOSSIL)
- cybelesae, Volvarina cybelesae J. Espinosa & J.A. Ortea, 2015 - (MARGINELLIDAE)
- cybium, Gastrochaena cybium L. Spengler, 1783 - syn of: Cucurbitula cymbium (L. Spengler, 1783) - (GASTROCHAENIDAE)
- Cycladamsia, Subgenus Aperostoma (Cycladamsia) P. Bartsch, 1942 (NEOCYCLOTIDAE)
- cycladea, Crassatella cycladea J.B.P.A. Lamarck, 1818 - syn of: Anapella cycladea (J.B.P.A. Lamarck, 1818) - (CRASSATELLIDAE)
- cycladea, Anapella cycladea (J.B.P.A. Lamarck, 1818) - (MESODESMATIDAE)
- Cycladella, syn of: Genus Sphaerium J.A. Scopoli, 1777 (SPHAERIIDAE)
- cycladensis, Bela cycladensis F. Nordsieck, 1977 - syn of: Sorgenfreispira brachystoma conspicua (F. Nordsieck, 1977) - (MANGELIIDAE)
- cycladensis, Bela cycladensis L.A. Reeve, 1845 - syn of: Sorgenfreispira brachystoma (R.A. Philippi, 1844) - (MANGELIIDAE)
- cycladia, Kellia cycladia Wood, 1840 † - (KELLIIDAE) (FOSSIL)
- Cycladicama, Genus Cycladicama A. Valenciennes in C. Rousseau, 1854 (UNGULINIDAE)
- Cycladichama, syn of: Genus Cycladicama A. Valenciennes in C. Rousseau, 1854 (UNGULINIDAE)
- cycladicum, Plathystimulus cycladicum A. Wiktor & M. Mylonas, 1981 - (AGRIOLIMACIDAE)
- cycladicus, Zonites pergranulatus cycladicus G.J. Pfeffer, 1930 - (ZONITIDAE)
- cycladiformis, Pseudocyrena cycladiformis (Deshayes 1825) † - (CYRENIDAE) (FOSSIL)
- cycladiformis, Kellia cycladiformis (G.P. Deshayes, 1851) - (KELLIIDAE)
- cycladiformis, Tellina cycladiformis S.C.T. Hanley, 1844 - (TELLINIDAE)
- Cycladina, syn of: Genus Lasaea T. Brown, 1827 (LASAEIDAE)
- Cycladina, syn of: Genus Pisidium L. Pfeiffer, 1821 (SPHAERIIDAE)
- Cycladites, syn of: Genus Sphaerium J.A. Scopoli, 1777 (SPHAERIIDAE)
- Cycladius, syn of: Genus Lasaea T. Brown, 1827 (LASAEIDAE)
- Cycladoconcha, syn of: Genus Entovalva A. Voeltzkow, 1890 (MONTACUTIDAE)
- Cyclamastra, Genus Cyclamastra H.A. Pilsbry & E.G. Vanatta, 1905 (AMASTRIDAE)
- cyclas, Astartila cyclas J.B.M. Dana, 1847 † - syn of: Astartila intrepida J.B.M. Dana, 1847 † - (MEGADESMIDAE) (FOSSIL)
- Cyclas, syn of: Genus Sphaerium J.A. Scopoli, 1777 (SPHAERIIDAE)
- cyclaspis, Plectopylis cyclaspis (W.H. Benson, 1859) - (PLECTOPYLIDAE)
- Cyclauchen, Subgenus Brachypodella (Cyclauchen) H.A. Pilsbry, 1930 (UROCOPTIDAE)
- Cyclendoceras, Genus Cyclendoceras Grabau & Shimer, 1910 † (ENDOCERATIDAE) (FOSSIL)
- cyclia, Adontorhina cyclia S.S. Berry, 1947 - (THYASIRIDAE)
- cyclica, Mitra cyclica A.A. Olsson, 1942 - syn of: Mitra belcheri R.B. Hinds, 1843 - (MITRIDAE)
- cyclica, Cyclinella cyclica (R.J.L. Guppy, 1866 †) - (VENERIDAE) (FOSSIL)
- cyclicum, Ctiloceras cyclicum (R.B. Watson, 1886) - (CAECIDAE)
- cyclicus, Sunites cyclicus C.K. Chang, 1960 † - (DIMEROCERATIDAE) (FOSSIL)
- Cyclina, Genus Cyclina G.P. Deshayes, 1850 (VENERIDAE)
- Cyclindromitra, syn of: Genus Pterygia P.F. Röding, 1798 (MITRIDAE)
- Cyclinella, Genus Cyclinella W.H. Dall, 1902 (VENERIDAE)
- Cyclinorbis, Genus Cyclinorbis Makiyama, 1926 (VENERIDAE)
- cyclips, Toxolasma cyclips C.S. Rafinesque, 1831 - syn of: Lampsilis abrupta T. Say, 1831 - (UNIONIDAE)
- Cycliscus, syn of: Genus Harmogenanina J. Germain, 1919 (HELICARIONIDAE)
- cyclist, Anticlimax cyclist F. Rubio & E. Rolán, 2014 - (TORNIDAE)
- Cyclites, Genus Cyclites Knight, 1940 † (MICRODOMATIDAE) (FOSSIL)
- Cycloadamsia, syn of: Subgenus Aperostoma (Cycladamsia) P. Bartsch, 1942 (NEOCYCLOTIDAE)
- cycloatus, Cyclotus cycloatus E. Chitty, 1857 - syn of: Poteria lineata (E. Chitty, 1857) - (CYCLOPHORIDAE)
- Cyclobactrites, Genus Cyclobactrites Shimansky, 1955 † (AGONIATITIDA (UNASSIGNED)) (FOSSIL)
- Cyclobakeria, Subgenus Poteria (Cyclobakeria) P. Bartsch, 1942 (NEOCYCLOTIDAE)
- cyclobates, Haliotis cyclobates F. Péron & C.A. Lesueur, 1816 - (HALIOTIDAE)
- Cyclobathmus, Genus Cyclobathmus Knight, 1940 † (MICRODOMATIDAE) (FOSSIL)
- Cycloblandia, Subgenus Amphicyclotus (Cycloblandia) P. Bartsch, 1942 (NEOCYCLOTIDAE)
- cyclocalyx, Cyclocalyx cyclocalyx Y.I. Starobogatov & L.L. Budnikova, 1985 - syn of: Pisidium hinzi J.G.J. Kuiper, 1975 - (SPHAERIIDAE)
- Cyclocalyx, syn of: Genus Pisidium L. Pfeiffer, 1821 (SPHAERIIDAE)
- Cyclocantha, syn of: Genus Astralium J.H.F. Link, 1807 (TURBINIDAE)
- Cyclocardia, Genus Cyclocardia T.A. Conrad, 1867 (CARDITIDAE)
- Cyclocaymania, Subgenus Cyclopilsbrya (Cyclocaymania) P. Bartsch, 1942 (MEGALOMASTOMIDAE)
- Cycloceltites, Genus Cycloceltites Mojsisovics , 1893 † (CYCLOCELTITIDAE) (FOSSIL)
- CYCLOCELTITIDAE Tozer, 1979 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-CHORISTOCERATOIDEA [Superfamily]) (FOSSIL)
- Cycloceras, Genus Cycloceras McCoy, 1844 † (BALTOCERATIDAE) (FOSSIL)
- Cycloceratites, Subgenus Ceratites (Cycloceratites) Schrammen, 1928 † (CERATITIDAE) (FOSSIL)
- Cyclocerion, syn of: Subgenus Cerion (Strophiops) W.H. Dall, 1894 (CERIONIDAE)
- Cyclochama, syn of: Genus Cycladicama A. Valenciennes in C. Rousseau, 1854 (UNGULINIDAE)
- Cyclochittya, Genus Cyclochittya J.P.E. Morrison, 1955 (NEOCYCLOTIDAE)
- CYCLOCHLAMYDIDAE Dijkstra & Maestrati, 2012 - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-PECTINIDA [Order]-PECTINOIDEA [Superfamily])
- CYCLOCHLAMYIDAE - syn of Family: CYCLOCHLAMYDIDAE
- Cyclochlamys, Genus Cyclochlamys H.J. Finlay, 1926 (CYCLOCHLAMYDIDAE)
- Cyclocholcus, syn of: Genus Cycloholcus Knight , 1947 † (HELCIONELLIDAE) (FOSSIL)
- Cycloclymenia, Genus Cycloclymenia Hyatt, 1884 † (PHENACOCERATIDAE) (FOSSIL)
- Cycloconcha, Genus Cycloconcha Miller, 1874 † (CYCLOCONCHIDAE) (FOSSIL)
- CYCLOCONCHIDAE Ulrich, 1884 † - Family (BIVALVIA-HETERODONTA [Subclass]-ARCHIHETERODONTA [Infraclass]-ACTINODONTIDA [Order]-ANODONTOPSOIDEA [Superfamily]) (FOSSIL)
- Cycloconchoides, Genus Cycloconchoides Zhang , 1980 † (STENOTHECOIDA INCERTAE SEDIS) (FOSSIL)
- cyclocostata, Pleuroclymenia cyclocostata Czarnocki, 1989 † - (PLATYCLYMENIIDAE) (FOSSIL)
- cyclocostatus, Tremanotus cyclocostatus Talent & Philip, 1956 † - (BUCANIIDAE) (FOSSIL)
- Cyclocubana, Subgenus Crocidopoma (Cyclocubana) P. Bartsch, 1942 (NEOCYCLOTIDAE)
- Cyclocyrtendoceras, Genus Cyclocyrtendoceras Balashov, 1961 † (CYRTENDOCERATIDAE) (FOSSIL)
- Cyclocyrtia, syn of: Genus Cyclope A. Risso, 1826 (NASSARIIDAE)
- Cyclocyrtonella, Genus Cyclocyrtonella Horný , 1962 † (CYRTOLITIDAE) (FOSSIL)
- Cyclocystis, Subgenus Trachycystis (Cyclocystis) H. Watson, 1934 (CHAROPIDAE)
- Cyclodicama, syn of: Genus Cycladicama A. Valenciennes in C. Rousseau, 1854 (UNGULINIDAE)
- Cyclodoma, syn of: Genus Polygyra T. Say, 1818 (POLYGYRIDAE)
- cyclodon, Trochoidea cyclodon D'Orbigny, 1839 - (HYGROMIIDAE)
- Cyclodontina, Genus Cyclodontina H.H. Beck, 1837 (ODONTOSTOMIDAE)
- Cyclodontostomia, syn of: Genus Odostomia J. Fleming, 1813 (PYRAMIDELLIDAE)
- Cyclodostomia, syn of: Genus Odostomia J. Fleming, 1813 (PYRAMIDELLIDAE)
- cycloeides, Calliotropis cycloeides C. Vilvens, 2007 - (CALLIOTROPIDAE)
- cycloferum, Caecum cycloferum Folin, 1867 - (CAECIDAE)
- cycloferum gracile, Caecum cycloferum gracile L. de Folin, 1870 - syn of: Caecum cycloferum Folin, 1867 - (CAECIDAE)
- Cycloglans, syn of: Genus Pleuromeris T.A. Conrad, 1867 (CARDITIDAE)
- Cyclohaitia, Genus Cyclohaitia Bartsch, 1942 (NEOCYCLOTIDAE)
- Cyclohelix, Subgenus Cyclophorus (Cyclohelix) O.A.L. Mörch, 1852 (CYCLOPHORIDAE)
- Cyclohidalgoa, Subgenus Aperostoma (Cyclohidalgoa) P. Bartsch, 1942 (NEOCYCLOTIDAE)
- Cycloholcus, Genus Cycloholcus Knight , 1947 † (HELCIONELLIDAE) (FOSSIL)
- cycloides, Megalomphala cycloides (E.F.R.K. Koken, 1896 †) - (BUCANIIDAE) (FOSSIL)
- cycloides, Granaria cycloides A. Moquin-Tandon, 1856 - syn of: Abida braunii E.A. Rossmässler, 1842 - (CHONDRINIDAE)
- cycloides, Donax cycloides A.E.M. Cossmann, 1886 † - (DONACIDAE) (FOSSIL)
- cycloides, Poecilomorphus cycloides (A.V.M.D. D'Orbigny, 1845 †) - (HAPLOCERATIDAE) (FOSSIL)
- cycloides, Platyceramus cycloides (Wegner, 1905 †) - (INOCERAMIDAE) (FOSSIL)
- cycloides, Venus cycloides D'Orbigny, 1845 - syn of: Dosinia ponderosa Gray, 1838 - (VENERIDAE)
- Cyclojamaicia, Genus Cyclojamaicia P. Bartsch, 1942 (MEGALOMASTOMIDAE)
- cyclolabris, Euhadra cyclolabris (O.F. von Möllendorff, 1899) - (BRADYBAENIDAE)
- cyclolabris, Thiessea cyclolabris G.P. Deshayes, 1839 - syn of: Helicigona arcadica (G.P. Deshayes, 1839) - (HELICIDAE)
- cyclolabris, Hydrobia cyclolabris J.R. Bourguignat, 1876 - syn of: Peringia ulvae (T. Pennant, 1777) - (HYDROBIIDAE)
- Cyclolimnea, syn of: Genus Radix P.D. Montfort, 1810 (LYMNAEIDAE)
- cycloliratus, Schizodus cycloliratus Harrington, 1955 † - (SCHIZODIDAE) (FOSSIL)
- cyclolites, Venus cyclolites J.B.G.M. Bory De Saint-Vincent, 1827 - syn of: Lajonkairia lajonkairii (B.C.M. Payraudeau, 1826) - (VENERIDAE)
- Cyclolituites, Genus Cyclolituites Remelé, 1886 † (LITUITIDAE) (FOSSIL)
- CYCLOLOBIDAE Zittel, 1895 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-GONIATITIDA [Order]-CYCLOLOBOIDEA [Superfamily]) (FOSSIL)
- Cyclolobus, Genus Cyclolobus Waagen , 1879 † (CYCLOLOBIDAE) (FOSSIL)
- cycloma, Liotina cycloma J.R. le B. Tomlin, 1918 - (LIOTIIDAE)
- cycloma, Minolia cycloma K.H. Barnard, 1958 - (SOLARIELLIDAE)
- Cyclomactra, Genus Cyclomactra W.H. Dall, 1895 (MACTRIDAE)
- Cyclomenia, Genus Cyclomenia H.F. Nierstrasz, 1902 (SIMROTHIELLIDAE)
- Cyclomolops, Genus Cyclomolops Gabb, 1868 † (ROSTELLARIIDAE) (FOSSIL)
- Cyclomonilearia, syn of: Subgenus Helicella (Xerotricha) T.A. de M. Monterosato, 1892 (HYGROMIIDAE)
- Cyclomorpha, Genus Cyclomorpha W.H. Pease, 1871 (ASSIMINEIDAE)
- cyclomphala, Valvata cyclomphala C.A. Westerlund, 1889 - (VALVATIDAE)
- Cyclomya, syn of: Genus Rhipidodonta O.A.L. Mörch, 1853 (HYRIIDAE)
- cyclomyata, Hemimenia cyclomyata L. Salvini-Plawén, 2006 - (HEMIMENIIDAE)
- Cyclonaias, Genus Cyclonaias H.A. Pilsbry, 1922 (UNIONIDAE)
- Cyclonassa, syn of: Genus Cyclope A. Risso, 1826 (NASSARIIDAE)
- cyclonema, Longstaffia cyclonema (Salter, 1873 †) - (LOPHOSPIRIDAE) (FOSSIL)
- Cyclonema, Genus Cyclonema Hall, 1852 † (PLATYCERATIDAE) (FOSSIL)
- Cyclonemina, syn of: Genus Cyclonema Hall, 1852 † (PLATYCERATIDAE) (FOSSIL)
- Cyclonenia, Genus Cyclonenia H. Nordsieck, 1999 (CLAUSILIIDAE)
- Cyclonidea, Genus Cyclonidea C.F. Laseron, 1956 (ACLIDIDAE)
- Cyclonima, syn of: Genus Cyclonema Hall, 1852 † (PLATYCERATIDAE) (FOSSIL)
- Cyclonoidea, syn of: Genus Aclis S.L. Lovén, 1846 (ACLIDIDAE)
- cyclopana, Panopea cyclopana T.A. de M. Monterosato, 1889 - syn of: Panopea glycimeris (I. von Born, 1778) - (HIATELLIDAE)
- Cyclope, Genus Cyclope A. Risso, 1826 (NASSARIIDAE)
- Cyclopecten, Genus Cyclopecten A.E. Verrill, 1897 (PROPEAMUSSIIDAE)
- Cyclopedus, Genus Cyclopedus O. Gargominy & I.V. Muratov, 2012 (NEOCYCLOTIDAE)
- Cyclopellatia, Genus Cyclopellatia Cossmann, 1907 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- cyclopeus, Macrosolen cyclopeus A. Brongniart, 1823 † - (MONTACUTIDAE) (FOSSIL)
- cyclophora, Proturritella cyclophora E.F.R.K. Koken & J. Perner, 1925 † - (LOPHOSPIRIDAE) (FOSSIL)
- cyclophora, Otitoma cyclophora (G.P. Deshayes, 1863) - (PSEUDOMELATOMIDAE)
- cyclophora, Hemidaphne cyclophora G.P. Deshayes, 1863 - syn of: Otitoma cyclophora (G.P. Deshayes, 1863) - (RAPHITOMIDAE)
- cyclophora, Daphnella cyclophora G.P. Deshayes, 1863 - syn of: Otitoma cyclophora (G.P. Deshayes, 1863) - (RAPHITOMIDAE)
- cyclophora, Pleurotoma cyclophora G.P. Deshayes, 1863 - syn of: Otitoma cyclophora (G.P. Deshayes, 1863) - (TURRIDAE)
- cyclophorella, Vallonia cyclophorella V. Sterki, 1892 - (VALLONIIDAE)
- cyclophorella kamtschatica, Vallonia cyclophorella kamtschatica I.M. Likharev, 1963 - syn of: Vallonia kamtschatica (I.M. Likharev, 1963) - (VALLONIIDAE)
- cyclophoreus, Haplocochlias cyclophoreus P.P. Carpenter, 1864 - (SKENEIDAE)
- CYCLOPHORIDAE Gray, 1847 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-ARCHITAENIOGLOSSA [Order]-CYCLOPHOROIDEA [Superfamily])
- cyclophoridus, Chamalycaeus cyclophoridus H.A. Pilsbry & Y. Hirase, 1909 - (CYCLOPHORIDAE)
- cyclophoridus koshuensis, Chamalycaeus cyclophoridus koshuensis J.T. Kuroda, 1936 - (CYCLOPHORIDAE)
- cyclophoroides, Alycaeus cyclophoroides H.A. Pilsbry & Y. Hirase, 1909 - syn of: Chamalycaeus cyclophoridus H.A. Pilsbry & Y. Hirase, 1909 - (CYCLOPHORIDAE)
- cyclophoroideus, Pterocyclus cyclophoroideus (G. Nevill, 1881) - (CYCLOPHORIDAE)
- Cyclophoropsis, syn of: Genus Maizania J.R. Bourguignat, 1889 (MAIZANIIDAE)
- cyclophorum, Cycloceras cyclophorum F. McCoy, 1844 † - (BALTOCERATIDAE) (FOSSIL)
- cyclophorum, Brachycycloceras cyclophorum (L. Waagen, 1879 †) - (BRACHYCYCLOCERATIDAE) (FOSSIL)
- cyclophorum, Orthoceras cyclophorum L. Waagen, 1879 † - syn of: Brachycycloceras cyclophorum (L. Waagen, 1879 †) - (ORTHOCERATIDAE) (FOSSIL)
- Cyclophorus, Genus Cyclophorus P.D. Montfort, 1810 (CYCLOPHORIDAE)
- cyclopica, Muticaria cyclopica Liberto, Reitano, Giglio, Colomba & Sparacio, 2016 - (CLAUSILIIDAE)
- Cyclopilsbrya, Genus Cyclopilsbrya P. Bartsch, 1942 (MEGALOMASTOMIDAE)
- Cyclopites, Genus Cyclopites Zhuravleva, 1962 † (POLYELASMOCERATIDAE) (FOSSIL)
- cyclopium, Crucibulum cyclopium S.S. Berry, 1969 - (CALYPTRAEIDAE)
- cycloplax, Oxytesta cycloplax (W.H. Benson) - (ARIOPHANTIDAE)
- Cycloplectoceras, Genus Cycloplectoceras Ulrich & al., 1942 † (TARPHYCERATIDAE) (FOSSIL)
- Cyclopoma, syn of: Genus Amphicyclotus J.C.H. Crosse & P. Fischer, 1879 (NEOCYCLOTIDAE)
- Cyclopomops, Genus Cyclopomops P. Bartsch & J.P.E. Morrison 1942 (NEOCYCLOTIDAE)
- Cycloprocta, syn of: Genus Pseudoveronicella J. Germain, 1908 (VERONICELLIDAE)
- Cyclops, syn of: Genus Cyclope A. Risso, 1826 (NASSARIIDAE)
- cyclops, Bouryia cyclops J. Le Renard, 1997 † - (POMATIOPSIDAE) (FOSSIL)
- cyclops, Unio cyclops T.A. Conrad, 1836 - syn of: Lampsilis abrupta T. Say, 1831 - (UNIONIDAE)
- cyclops, Valcouroceras cyclops Flower, 1943 † - (VALCOUROCERATIDAE) (FOSSIL)
- CYCLOPSIDAE - syn of Family: NASSARIIDAE
- cycloptera, Clymenia cycloptera Wedekind, 1908 † - syn of: Platyclymenia cycloptera (Wedekind, 1908 †) - (CLYMENIIDAE) (FOSSIL)
- cycloptera, Protactoclymenia cycloptera Wedekind, 1908 † - syn of: Platyclymenia cycloptera (Wedekind, 1908 †) - (CYRTOCLYMENIIDAE) (FOSSIL)
- cycloptera, Platyclymenia cycloptera (Wedekind, 1908 †) - (PLATYCLYMENIIDAE) (FOSSIL)
- cycloptera, Platyclymenia cycloptera Wedekind, 1908 † - syn of: Platyclymenia cycloptera (Wedekind, 1908 †) - (PLATYCLYMENIIDAE) (FOSSIL)
- cyclopterus, Pterynotus cyclopterus P.A. Millet, 1875 † - syn of: Pterynotus gastaldi (L.M.D. Bellardi, 1872 †) - (MURICIDAE) (FOSSIL)
- cyclopterus, Purpurellus cyclopterus P.A. Millet, 1875 † - syn of: Pterynotus gastaldi (L.M.D. Bellardi, 1872 †) - (MURICIDAE) (FOSSIL)
- cyclopum, Panopea cyclopum T.A. de M. Monterosato, 1889 - syn of: Panopea glycimeris (I. von Born, 1778) - (HIATELLIDAE)
- cyclopus, Murex cyclopus T.A. de M. Monterosato, 1884 - syn of: Murexsul aradasii (T.A. de M. Monterosato in N.J. Poirier, 1883) - (MURICIDAE)
- cyclopus, Ocinebrina cyclopus L. Benoit in T.A. de M. Monterosato, 1884 - syn of: Ocinebrina edwardsi (B.C.M. Payraudeau, 1826) - (MURICIDAE)
- cycloquadrata, Anthracosphaerium cycloquadrata W.B. Wright, 1929 † - (ANTHRACOSIIDAE) (FOSSIL)
- Cyclora, Genus Cyclora Hall, 1845 † (HOLOPEIDAE) (FOSSIL)
- cycloradiata, Pseudostomatella cycloradiata G.W. Nowell-Usticke, 1959 - (TROCHIDAE)
- Cyclorangeroceras, Genus Cyclorangeroceras Evans , 2005 † (RANGEROCERATIDAE) (FOSSIL)
- Cyclorisma, Genus Cyclorisma Dall, 1902 † (VENERIDAE) (FOSSIL)
- Cyclorismina, Genus Cyclorismina Marwick , 1927 † (VENERIDAE) (FOSSIL)
- Cycloryx, Genus Cycloryx H.H. Godwin-Austen, 1914 (CYCLOPHORIDAE)
- Cycloscala, Genus Cycloscala W.H. Dall, 1889 (EPITONIIDAE)
- Cycloscena, Genus Cycloscena Fletcher, 1958 † (ANOMPHALIDAE) (FOSSIL)
- cyclosis, Trachybembix cyclosis Pan, 1982 † - (STUORELLIDAE) (FOSSIL)
- Cyclospongia, Genus Cyclospongia Miller, 1892 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- cyclostata, Platyclymenia cyclostata (Pajchlowa, 1972 †) - (PLATYCLYMENIIDAE) (FOSSIL)
- cyclostata, Varioclymenia cyclostata Pajchlowa, 1972 † - syn of: Platyclymenia cyclostata (Pajchlowa, 1972 †) - (PLATYCLYMENIIDAE) (FOSSIL)
- cyclostoma, Amastra cyclostoma D.D. Baldwin, 1895 - (AMASTRIDAE)
- cyclostoma, Pomacea cyclostoma (J.B. von Spix, 1827) - (AMPULLARIIDAE)
- cyclostoma, Pisinna cyclostoma J.E. Tenison-Woods, 1877 - syn of: Pisinna approximata (W.F. Petterd, 1884) - (ANABATHRIDAE)
- cyclostoma, Heliacus cyclostoma K.T. Menke, 1830 - syn of: Heliacus cylindricus (J.F. Gmelin, 1791) - (ARCHITECTONICIDAE)
- cyclostoma, Bithynia cyclostoma (C. Rousseau, 1842 †) - (BITHYNIIDAE) (FOSSIL)
- cyclostoma, Alopia cyclostoma E.A. Bielz, 1858 - (CLAUSILIIDAE)
- cyclostoma, Cyclonenia cyclostoma (L. Pfeiffer, 1849) - (CLAUSILIIDAE)
- cyclostoma, Columbina cyclostoma L. Pfeiffer, 1849 - syn of: Alopia cyclostoma E.A. Bielz, 1858 - (CLAUSILIIDAE)
- cyclostoma, Diplommatina cyclostoma O.F. von Möllendorff, 1897 - (DIPLOMMATINIDAE)
- cyclostoma, Streptotrochus cyclostoma (J.J.F. Whiteaves, 1884 †) - (ELASMONEMATIDAE) (FOSSIL)
- cyclostoma, Ooliticia cyclostoma Benz, 1832 † - syn of: Marloffsteinia cyclostoma (Benz, 1832 †) - (EUCYCLIDAE) (FOSSIL)
- cyclostoma, Marloffsteinia cyclostoma (Benz, 1832 †) - (EUCYCLOSCALIDAE) (FOSSIL)
- cyclostoma, Helix cyclostoma E.J. Le Guillou, 1842 - syn of: Trachiopsis strangulata (J.B. Hombron & C.H. Jacquinot, 1841) - (HELICIDAE)
- cyclostoma, Alexogyra cyclostoma (Benz 1832 †) - (HYALOGYRINIDAE) (FOSSIL)
- cyclostoma, Galba cyclostoma B. Walker, 1908 - (LYMNAEIDAE)
- cyclostoma, Favartia cyclostoma (G.B. I Sowerby, 1841) - (MURICIDAE)
- cyclostoma, Murex cyclostoma G.B. I Sowerby, 1841 - syn of: Favartia cyclostoma (G.B. I Sowerby, 1841) - (MURICIDAE)
- cyclostoma, Eulithidium cyclostoma (P.P. Carpenter, 1864) - (PHASIANELLIDAE)
- cyclostoma, Tricolia cyclostoma (P.P. Carpenter, 1864) - syn of: Eulithidium cyclostoma (P.P. Carpenter, 1864) - (PHASIANELLIDAE)
- cyclostoma, Pleurotomaria cyclostoma J.J.F. Whiteaves, 1884 † - syn of: Streptotrochus cyclostoma (J.J.F. Whiteaves, 1884 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- Cyclostoma, Genus Cyclostoma J.B.P.A. Lamarck, 1799 (POMATIIDAE)
- Cyclostoma, syn of: Genus Pomatias S.E. Studer, 1789 (POMATIIDAE)
- cyclostoma, Macrochilina cyclostoma Whidborne, 1891 † - (SOLENISCIDAE) (FOSSIL)
- cyclostoma, Turbo cyclostoma Benz, 1832 † - syn of: Marloffsteinia cyclostoma (Benz, 1832 †) - (TURBINIDAE) (FOSSIL)
- cyclostoma, Holospira cyclostoma H.A. Pilsbry, 1953 - (UROCOPTIDAE)
- cyclostoma, Tetrentodon cyclostoma (L. Pfeiffer, 1856) - (UROCOPTIDAE)
- cyclostoma, Vallonia cyclostoma C.A. Westerlund, 1881 - syn of: Vallonia costata (O.F. Müller, 1774) - (VALLONIIDAE)
- cyclostoma, Valvata cyclostoma (Š. Brusina, 1902 †) - (VALVATIDAE) (FOSSIL)
- cyclostoma, Amplovalvata cyclostoma T.C. Yen, 1952 † - (VALVATIDAE) (FOSSIL)
- cyclostoma albicostata, Alopia cyclostoma albicostata M. von Kimakowicz, 1894 - (CLAUSILIIDAE)
- cyclostoma baldwiniana, Murex cyclostoma baldwiniana H.A. Pilsbry, 1921 - syn of: Favartia garrettii (W.H. Pease, 1868) - (MURICIDAE)
- cyclostoma gregoryi, Amastra cyclostoma gregoryi C.M. Cooke, 1933 - (AMASTRIDAE)
- cyclostomaformis, Lioplax cyclostomaformis (H.C. Lea, 1841) - (VIVIPARIDAE)
- Cyclostomaria, Genus Cyclostomaria Szabo , 1980 † (PLEUROTOMARIIDAE) (FOSSIL)
- cyclostomata, Rissoa cyclostomata C.A. Récluz, 1843 - syn of: Alvania zetlandica (G. Montagu, 1815) - (RISSOIDAE)
- Cyclostomiceras, Genus Cyclostomiceras Hyatt in Zittel, 1900 † (CYCLOSTOMICERATIDAE) (FOSSIL)
- CYCLOSTOMICERATIDAE Foerste, 1925 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-ELLESMEROCERIDA [Order]) (FOSSIL)
- CyclostomiRenier,, syn of: Genus Pomatias S.E. Studer, 1789 (POMATIIDAE)
- cyclostomoides, Helix cyclostomoides L. Pfeiffer, 1840 - syn of: Vitrinella cyclostomoides (L. Pfeiffer, 1840) - (HELICIDAE)
- cyclostomoides, Pseudamnicola cyclostomoides (Sinzov, 1880 †) - (HYDROBIIDAE) (FOSSIL)
- cyclostomoides, Gegania cyclostomoides (G.P. Deshayes, 1861 †) - (MATHILDIDAE) (FOSSIL)
- cyclostomoides, Cleopatra cyclostomoides (H.C. Küster, 1852) - (PALUDOMIDAE)
- cyclostomoides, Roemeriella cyclostomoides (A. Römer, 1850 †) - (PSEUDOPHORIDAE) (FOSSIL)
- cyclostomoides, Amphirissoa cyclostomoides P. Dautzenberg & H. Fischer, 1897 - (RISSOIDAE)
- cyclostomoides, Vitrinella cyclostomoides (L. Pfeiffer, 1840) - (TORNIDAE)
- cyclostomoides tchadiensis, Cleopatra cyclostomoides tchadiensis J. Germain, 1907 - (PALUDOMIDAE)
- cyclostomopsis, Zagrabica cyclostomopsis Š. Brusina, 1884 † - (LYMNAEIDAE) (FOSSIL)
- cyclostomum, Architectonica cyclostomum K.T. Menke, 1830 - syn of: Heliacus cylindricus (J.F. Gmelin, 1791) - (ARCHITECTONICIDAE)
- cyclostomum, Solarium cyclostomum J.W. Mighels, 1845 - syn of: Heliacus mighelsi (R.A. Philippi, 1853) - (ARCHITECTONICIDAE)
- cyclostomum, Cerion cyclostomum (H.C. Küster, 1841) - (CERIONIDAE)
- cyclostomum, Cyrtoceras cyclostomum (Barrande, 1866 †) - (ONCOCERIDA (UNASSIGNED)) (FOSSIL)
- cyclostomum latior, Torinia cyclostomum latior S.C.T. Hanley, 1863 - syn of: Heliacus cylindricus (J.F. Gmelin, 1791) - (ARCHITECTONICIDAE)
- cyclostomus, Bulimus cyclostomus J.B.P.A. Lamarck, 1804 † - (BULIMULIDAE) (FOSSIL)
- cyclostomus, Philoxene cyclostomus (J.W. Hall, 1858 †) - (EUOMPHALIDAE) (FOSSIL)
- cyclostomus, Planorbis cyclostomus Š. Brusina, 1902 † - syn of: Valvata cyclostoma (Š. Brusina, 1902 †) - (PLANORBIDAE) (FOSSIL)
- cyclostomus, Strophostylus cyclostomus J.W. Hall, 1864 † - (PLATYCERATIDAE) (FOSSIL)
- Cyclostomus, syn of: Genus Pomatias S.E. Studer, 1789 (POMATIIDAE)
- cyclostomus, Solenochilus cyclostomus (Phillips, 1836) † - (SOLENOCHILIDAE) (FOSSIL)
- Cyclostrema, Genus Cyclostrema F. Marryat, 1818 (LIOTIIDAE)
- cyclostrema, Valvata cyclostrema Š. Brusina, 1892 † - (VALVATIDAE) (FOSSIL)
- CYCLOSTREMATIDAE - syn of Family: LIOTIIDAE
- Cyclostremela, Genus Cyclostremela † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Cyclostremella, Genus Cyclostremella K.J. Bush, 1897 (PYRAMIDELLIDAE)
- Cyclostremicus, syn of: Genus Cyclostremiscus H.A. Pilsbry & A.A. Olsson, 1945 (TORNIDAE)
- Cyclostremiscus, Genus Cyclostremiscus H.A. Pilsbry & A.A. Olsson, 1945 (TORNIDAE)
- cyclostremoides, Helicopsis cyclostremoides G.B. Sowerby, 1904 - (HYGROMIIDAE)
- Cyclostromella, syn of: Genus Lodderia R. Tate, 1899 (SKENEIDAE)
- Cyclosunetta, syn of: Genus Sunetta J.H.F. Link, 1807 (VENERIDAE)
- Cyclosurus, Genus Cyclosurus P.M.A. Morelet, 1881 (CYCLOPHORIDAE)
- Cyclotellina, Subgenus Arcopagia (Cyclotellina) W.A. Wenz, 1923 (TELLINIDAE)
- CYCLOTEUTHIDAE Naef, 1923 - Family (CEPHALOPODA-COLEOIDEA [Subclass]-DECAPODIFORMES [Superorder]-OEGOPSIDA [Order])
- Cycloteuthis, Genus Cycloteuthis L.M.A.O.E. Joubin, 1919 (CYCLOTEUTHIDAE)
- Cyclotheca, syn of: Genus Cyclothyca R.E.C. Stearns, 1891 (AMATHINIDAE)
- Cyclotheca, Genus Cyclotheca Teichert, 1935 † (PTEROTHECIDAE) (FOSSIL)
- Cyclothyca, Genus Cyclothyca R.E.C. Stearns, 1891 (AMATHINIDAE)
- cyclothyra, Bythinella cyclothyra (Boettger, 1869 †) - (BYTHINELLIDAE) (FOSSIL)
- cyclothyra, Albinaria hians cyclothyra (O. Böttger, 1878) - (CLAUSILIIDAE)
- cyclothyra, Hypnophila cyclothyra (O. Böttger, 1885) - (COCHLICOPIDAE)
- Cyclothyrella, Genus Cyclothyrella Neubauer, Mandic, Harzhauser & Hrvatovic, 2013 † (HYDROBIIDAE) (FOSSIL)
- cyclotina, Daronia cyclotina A. Adams, 1864 - (NEOCYCLOTIDAE)
- Cyclotopsis, Genus Cyclotopsis W.T. Blanford, 1864 (POMATIIDAE)
- Cyclotrema, syn of: Genus Cyclostrema F. Marryat, 1818 (LIOTIIDAE)
- Cyclotropis, Genus Cyclotropis C.M. Tapparone-Canefri, 1883 (ASSIMINEIDAE)
- Cycloturbo, Genus Cycloturbo Conti & Fischer, 1983 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Cyclotus, Genus Cyclotus W.J. Swainson, 1840 (CYCLOPHORIDAE)
- cyclotus, Aegopinella cyclotus A. Bofill, 1909 - syn of: Aegopinella epipedostoma (P. Fagot, 1879) - (ZONITIDAE)
- cyclotusoides, Valvata cyclotusoides Raspail, 1909 † - (VALVATIDAE) (FOSSIL)
- Cyclovendreysia, Genus Cyclovendreysia P. Bartsch, 1942 (NEOCYCLOTIDAE)
- Cyclozyga, Genus Cyclozyga Knight, 1930 † (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- cyclura, Strophiops cyclura C.J. Maynard & W.F. Clapp, 1920 - syn of: Cerion glans H.C. Küster, 1844 - (CERIONIDAE)
- cyclura, Leachia cyclura C.A. Lesueur, 1821 - (CRANCHIIDAE)
- cyclura, Loligopsis cyclura A.E.J. Férussac & A.V.M.D. D'Orbigny, 1835 - (IDIOSEPIIDAE)
- cyclus, Liocerithium cyclus W.H. Dall, 1919 - syn of: Liocerithium interruptum (K.T. Menke, 1851) - (CERITHIIDAE)
- cyclus, Petricola cyclus H.A. Pilsbry, 1901 - syn of: Petricola fabagella J.B.P.A. Lamarck, 1818 - (VENERIDAE)
- cyclus sculpturata, Petricola cyclus sculpturata H.A. Pilsbry, 1901 - syn of: Petricola fabagella J.B.P.A. Lamarck, 1818 - (VENERIDAE)
- Cycopecten, syn of: Genus Cyclopecten A.E. Verrill, 1897 (PROPEAMUSSIIDAE)
- Cycria, syn of: Genus Ommastrephes D'Orbigny, 1834 (OMMASTREPHIDAE)
- Cyctostomus, syn of: Genus Pomatias S.E. Studer, 1789 (POMATIIDAE)
- cydarum, Ellatrivia cydarum (C.N. Cate, 1979) - (TRIVIIDAE)
- cydarum, Trivirostra cydarum C.N. Cate, 1979 - syn of: Ellatrivia cydarum (C.N. Cate, 1979) - (TRIVIIDAE)
- cydia, Drillia cydia (P. Bartsch, 1943) - (DRILLIIDAE)
- cydia barbadensis, Drillia cydia barbadensis P. Bartsch, 1943 - (DRILLIIDAE)
- Cydippe, syn of: Genus Arcopagia W.E. Leach in T. Brown, 1827 (TELLINIDAE)
- cydippe, Dosinia cydippe A. Adams, 1856 - syn of: Dosinia caerulea L.A. Reeve, 1850 - (VENERIDAE)
- Cydippina, syn of: Genus Psammotreta W.H. Dall, 1900 (TELLINIDAE)
- Cyerce, Genus Cyerce L.S.R. Bergh, 1871 (CALIPHYLLIDAE)
- cygna, Rhagada cygna G.A. Solem, 1997 - (CAMAENIDAE)
- cygnea, Armina cygnea (L.S.R. Bergh, 1876) - (ARMINIDAE)
- cygnea, Luinodiscus cygnea (W.H. Benson, 1853) - (CHAROPIDAE)
- cygnea, Crassatella cygnea (J.H. Chemnitz, 1782 †) - (CRASSATELLIDAE) (FOSSIL)
- cygnea, Clavus cygnea (J.C. Melvill & R. Standen, 1897) - (DRILLIIDAE)
- cygnea, Amberleya cygnea Hudleston † - (EUCYCLIDAE) (FOSSIL)
- cygnea, Pseudopaludinella cygnea V.V. Anistratenko, 1992 - (HYDROBIIDAE)
- cygnea, Mactra cygnea R.A. Philippi, 1844 - syn of: Mactra olorina R.A. Philippi, 1846 - (MACTRIDAE)
- cygnea, Mactra cygnea L. Spengler, 1802 - syn of: Mactra cygnus J.F. Gmelin, 1791 - (MACTRIDAE)
- cygnea, Natica cygnea R.A. Philippi, 1852 - syn of: Polinices mammilla (C. Linnaeus, 1758) - (NATICIDAE)
- cygnea, Nuculana cygnea (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (NUCULANIDAE)
- cygnea, Ovula cygnea P.F. Röding, 1798 - syn of: Ovula ovum (C. Linnaeus, 1758) - (OVULIDAE)
- cygnea, Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- cygnea armenica, Anodonta cygnea armenica Ovtschinnikov, 1935 - syn of: Anodonta cyrea H. Drouët, 1881 - (UNIONIDAE)
- cygnea cellensis, Anodonta cygnea cellensis (J.F. Gmelin, 1791) - (UNIONIDAE)
- cygnea piscinalis, Anodonta cygnea piscinalis (C. Linnaeus, 1758) - syn of: Anodonta anatina (C. Linnaeus, 1758) - (UNIONIDAE)
- cygnea piscinalis, Anodonta cygnea piscinalis S. Nilsson, 1823 - syn of: Anodonta anatina (C. Linnaeus, 1758) - (UNIONIDAE)
- cygneiformis, Anodontites trapesialis cygneiformis (H.A. Pilsbry, 1896) - (MYCETOPODIDAE)
- cygneum, Armenoceras cygneum Holland, 1998 † - (ARMENOCERATIDAE) (FOSSIL)
- cygneus, Drymaeus cygneus R.A. Philippi, 1867 - (BULIMULIDAE)
- cygneus, Mytilus cygneus C. Linnaeus, 1758 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (MYTILIDAE)
- cygni, Annularella cygni (H.A. Pilsbry, 1930) - (POMATIIDAE)
- cygnicollis, Parastrophia cygnicollis (C. Hedley, 1904) - (CAECIDAE)
- cygnipes, Palmoxytoma cygnipes (A.T. Young & Bird, 1822 †) - (OXYTOMIDAE) (FOSSIL)
- cygnoides, Gryphaea cygnoides Whidborne † - (GRYPHAEIDAE) (FOSSIL)
- cygnorum, Acrosterigma cygnorum (G.P. Deshayes, 1855) - (CARDIIDAE)
- cygnorum, Succinea cygnorum H.A. Pilsbry, 1930 - (SUCCINEIDAE)
- cygnus, Argonauta argo cygnus T.A. de M. Monterosato, 1913 - (ARGONAUTIDAE)
- cygnus, Mactra cygnus J.F. Gmelin, 1791 - (MACTRIDAE)
- cygnus, Tellina cygnus S.C.T. Hanley, 1844 - (TELLINIDAE)
- cygnus, Thyasira cygnus W.H. Dall, 1916 - (THYASIRIDAE)
- cygnus, Periglypta cygnus A. Aradas & L. Benoit, 1872 - syn of: Venus casina C. Linnaeus, 1758 - (VENERIDAE)
- Cylichna, Genus Cylichna S.L. Lovén, 1846 (CYLICHNIDAE)
- cylichna, Cylichnidia cylichna (R.T. Lowe, 1852) - (FERUSSACIIDAE)
- Cylichnania, Genus Cylichnania Marwick, 1931 † (CYLICHNIDAE) (FOSSIL)
- Cylichnatys, Genus Cylichnatys J.T. Kuroda & T. Habe, 1952 (HAMINOEIDAE)
- Cylichnella, Genus Cylichnella W.M. Gabb, 1873 (CYLICHNIDAE)
- cylichnella, Balanetta cylichnella (W.L. May, 1918) - (MARGINELLIDAE)
- cylichnella, Ovaginella cylichnella W.L. May, 1917 - syn of: Balanetta cylichnella (W.L. May, 1918) - (MARGINELLIDAE)
- CYLICHNIDAE H. & A. Adams, 1854 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-CEPHALASPIDEA [Order]-DIAPHANOIDEA [Superfamily])
- Cylichnidia, Genus Cylichnidia R.T. Lowe, 1852 (FERUSSACIIDAE)
- Cylichnina, Subgenus Retusa (Cylichnina) T.A. de M. Monterosato, 1884 (RETUSIDAE)
- Cylichnium, Genus Cylichnium W.H. Dall, 1908 (HAMINOEIDAE)
- Cylichnoides, Genus Cylichnoides Y.S. Minichev, 1977 (CYLICHNIDAE)
- Cylichnopsis, Subgenus Cylichna (Cylichnopsis) A.E.M. Cossmann, 1904 † (CYLICHNIDAE) (FOSSIL)
- Cylicioscapha, Genus Cylicioscapha Yochelson, 1956 † (EUOMPHALIDAE) (FOSSIL)
- Cylidrocaulidea, syn of: Genus Leidyula F.C. Baker, 1925 (VERONICELLIDAE)
- Cylinder, Genus Cylinder P.D. Montfort, 1810 (CONIDAE)
- cylindra, Cylichna cylindra J.G. Bruguière, 1791 - syn of: Cylichna cylindracea (T. Pennant, 1777) - (CYLICHNIDAE)
- Cylindra, syn of: Genus Pterygia P.F. Röding, 1798 (MITRIDAE)
- cylindraca, Cylichna cylindraca J.G. Bruguière, 1792 - syn of: Cylichna cylindracea (T. Pennant, 1777) - (CYLICHNIDAE)
- cylindracea, Torinia cylindracea S.C.T. Hanley, 1863 - syn of: Heliacus infundibuliformis (J.F. Gmelin, 1791) - (ARCHITECTONICIDAE)
- cylindracea, Torinia cylindracea G.B. III Sowerby, 1897 - syn of: Heliacus infundibuliformis strigata S.C.T. Hanley, 1863 - (ARCHITECTONICIDAE)
- cylindracea, Barbatia cylindracea (G.P. Deshayes, 1829 †) - (ARCIDAE) (FOSSIL)
- cylindracea, Bulla cylindracea T. Pennant, 1777 - syn of: Cylichna cylindracea (T. Pennant, 1777) - (BULLIDAE)
- cylindracea, Bythinella cylindracea (A. Paladilhe, 1869) - (BYTHINELLIDAE)
- cylindracea, Krachia cylindracea J.G. Jeffreys, 1885 - syn of: Krachia cylindrata (J.G. Jeffreys, 1885) - (CERITHIOPSIDAE)
- cylindracea, Clathurella cylindracea É.A.A. Locard & E. Caziot, 1900 - syn of: Raphitoma cylindracea (É.A.A. Locard & E. Caziot, 1900) - (CLATHURELLIDAE)
- cylindracea, Hypnophila cylindracea (P. Calcara, 1840) - (COCHLICOPIDAE)
- cylindracea, Cylichna cylindracea (T. Pennant, 1777) - (CYLICHNIDAE)
- cylindracea, Lauria cylindracea (E.M. Da Costa, 1778) - (LAURIIDAE)
- cylindracea, Oenopota cylindracea H.P.C. Møller, 1842 - syn of: Oenopota violacea (J.W. Mighels & C.B. Adams, 1842) - (MANGELIIDAE)
- cylindracea, Marginella cylindracea (G.P. Deshayes, 1865 †) - (MARGINELLIDAE) (FOSSIL)
- cylindracea, Mitra cylindracea L.A. Reeve, 1844 - syn of: Mitra variabilis L.A. Reeve, 1844 - (MITRIDAE)
- cylindracea, Montacuta cylindracea E.A. Smith, 1885 - (MONTACUTIDAE)
- cylindracea, Anodontites cylindracea (I. Lea, 1838) - (MYCETOPODIDAE)
- cylindracea, Anculosa cylindracea T.A. Conrad, 1834 - (PLEUROCERIDAE)
- cylindracea, Pyrgulina cylindracea G.S. Coen, 1933 - syn of: Parthenina terebellum (R.A. Philippi, 1844) - (PYRAMIDELLIDAE)
- cylindracea, Raphitoma cylindracea (É.A.A. Locard & E. Caziot, 1900) - (RAPHITOMIDAE)
- cylindracea, Rissoina cylindracea J.E. Tenison-Woods, 1878 - syn of: Epigrus cylindraceus (J.E. Tenison-Woods, 1878) - (RISSOINIDAE)
- cylindracea, Cosmomenus cylindracea (B. Phillips, 1846) - (SPIRAXIDAE)
- cylindracea, Stenothyra cylindracea G.P. Deshayes, 1862 † - syn of: Hyattites praefloridus (Mojsisovics, 1873 †) - (STENOTHYRIDAE) (FOSSIL)
- cylindracea, Subulina cylindracea J.R. Bourguignat, 1889 - (SUBULINIDAE)
- cylindracea, Truncatella cylindracea W.H. Pease, 1878 - (TRUNCATELLIDAE)
- cylindracea, Elliptio cylindracea L.S. Frierson, 1927 - (UNIONIDAE)
- cylindracea, Anodonta cylindracea I. Lea, 1838 - syn of: Anodontites cylindracea (I. Lea, 1838) - (UNIONIDAE)
- cylindracea, Petricola cylindracea G.P. Deshayes, 1839 - syn of: Petricola carditoides (T.A. Conrad, 1837) - (VENERIDAE)
- cylindracea linearis, Cylichna cylindracea linearis J.G. Jeffreys, 1867 - syn of: Cylichna cylindracea (T. Pennant, 1777) - (CYLICHNIDAE)
- Cylindraceana, syn of: Genus Lauria J.E. Gray in W.H. Turton, 1840 (LAURIIDAE)
- cylindraceum, Cerithium cylindraceum W.H. Pease, 1869 - syn of: Cerithium columna G.B. I Sowerby, 1834 - (CERITHIIDAE)
- cylindraceum, Cerithiopsis cylindraceum W.H. Pease, 1869 - syn of: Cerithiopsis columna P.P. Carpenter, 1864 - (CERITHIOPSIDAE)
- cylindraceum, Diplomoceras cylindraceum (J.L.M. Defrance, 1816 †) - (DIPLOMOCERATIDAE) (FOSSIL)
- cylindraceum vermetiformis, Solarium cylindraceum vermetiformis J.F. Gmelin, 1791 - syn of: Heliacus infundibuliformis (J.F. Gmelin, 1791) - (ARCHITECTONICIDAE)
- cylindraceus, Heliacus cylindraceus L.W. Dillwyn, 1817 - syn of: Heliacus cylindricus (J.F. Gmelin, 1791) - (ARCHITECTONICIDAE)
- cylindraceus, Mitraconus cylindraceus (W.J. Broderip & G.B. I Sowerby, 1830) - (CONIDAE)
- cylindraceus, Epigrus cylindraceus (J.E. Tenison-Woods, 1878) - (EPIGRIDAE)
- cylindraceus, Atys cylindraceus G.S. Helbling, 1779 - syn of: Aliculastrum cylindricum (G.S. Helbling, 1779) - (HAMINOEIDAE)
- cylindraceus, Mytilaster cylindraceus A. Marion, 1887 - syn of: Mytilaster marioni (É.A.A. Locard, 1889) - (MYTILIDAE)
- cylindraceus, Mytilus cylindraceus E. Réquien, 1848 - syn of: Mytilaster minimus (G.S. Poli, 1795) - (MYTILIDAE)
- cylindraceus, Mytilaster cylindraceus E. Réquien, 1848 - syn of: Mytilaster minimus (G.S. Poli, 1795) - (MYTILIDAE)
- cylindraceus, Ptychatractus cylindraceus (G.P. Deshayes, 1864 †) - (PTYCHATRACTIDAE) (FOSSIL)
- cylindraceus, Solen cylindraceus S.C.T. Hanley, 1843 - (SOLENIDAE)
- cylindraceus, Trochus cylindraceus L.W. Dillwyn, 1817 - syn of: Heliacus cylindricus (J.F. Gmelin, 1791) - (TROCHIDAE)
- cylindrata, Tubuaia cylindrata C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- cylindrata, Acteonina cylindrata (F. Haas, 1953 †) - (ACTEONINIDAE) (FOSSIL)
- cylindrata, Leptachatina cylindrata W.H. Pease, 1869 - (AMASTRIDAE)
- cylindrata, Krachia cylindrata (J.G. Jeffreys, 1885) - (CERITHIOPSIDAE)
- cylindrata, Coelostylina cylindrata F. Haas, 1953 † - syn of: Acteonina cylindrata (F. Haas, 1953 †) - (COELOSTYLINIDAE) (FOSSIL)
- cylindrata, Eulima cylindrata R.B. Watson, 1883 - (EULIMIDAE)
- cylindrata, Coilostele cylindrata O. Böttger, 1905 - (FERUSSACIIDAE)
- cylindrata, Gadila cylindrata (J.G. Jeffreys, 1877) - (GADILIDAE)
- cylindrata, Granulina cylindrata F. Boyer & E. Rolán, 2004 - (MARGINELLIDAE)
- cylindrata, Serrata cylindrata F. Boyer, 2008 - (MARGINELLIDAE)
- cylindrata, Melanopsis cylindrata Blanckenhorn, 1897 † - (MELANOPSIDAE) (FOSSIL)
- cylindrata, Cerithiella cylindrata J.G. Jeffreys, 1885 - (NEWTONIELLIDAE)
- cylindrata, Palaeostylus cylindrata Knight, 1930 † - (PALAEOSTYLIDAE) (FOSSIL)
- cylindrata, Bouryia cylindrata (Briart & Cornet, 1887 †) - (POMATIOPSIDAE) (FOSSIL)
- cylindrata, Pseudozygopleura cylindrata Knight 1930 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- cylindrata, Eulimella cylindrata A. Pimenta, F.N. Santos & R.S. Absalão, 2011 - (PYRAMIDELLIDAE)
- cylindrata, Turbonilla pusilla cylindrata J.T. Marshall, 1893 - (PYRAMIDELLIDAE)
- cylindrata, Lyropupa perlonga cylindrata H.A. Pilsbry & C.M. Cooke, 1920 - (VERTIGINIDAE)
- cylindrata philolichen, Tubuaia cylindrata philolichen C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- cylindratum, Cerithium cylindratum J.G. Jeffreys, 1885 - syn of: Krachia cylindrata (J.G. Jeffreys, 1885) - (CERITHIIDAE)
- cylindratum, Stokesoceras cylindratum Foerste & Savage, 1927 † - (LOWOCERATIDAE) (FOSSIL)
- cylindratus, Cadulus cylindratus J.G. Jeffreys, 1877 - (GADILIDAE)
- cylindrella, Fernandezia cylindrella N.H. Odhner, 1921 - (ACHATINELLIDAE)
- cylindrella, Volvula cylindrella A. Adams, 1862 - syn of: Volvulella cylindrella (A. Adams, 1862) - (ACTEOCINIDAE)
- cylindrella, Leptachatina pachystoma cylindrella C.M. Cooke, 1910 - (AMASTRIDAE)
- cylindrella, Abida cylindrella A. Moquin-Tandon, 1856 - syn of: Abida secale affinis E.A. Rossmässler, 1839 - (CHONDRINIDAE)
- cylindrella, Euphaedusa cylindrella (P.M. Heude, 1886) - (CLAUSILIIDAE)
- Cylindrella, syn of: Genus Asprella L.W. Schaufuss, 1869 (CONIDAE)
- cylindrella, Turriscala cylindrella (H.H. Suter, 1917 †) - (EPITONIIDAE) (FOSSIL)
- cylindrella, Enneopupa cylindrella (C.L.F. von Sandberger, 1858 †) - (PUPILLIDAE) (FOSSIL)
- cylindrella, Syrnola cylindrella A. Adams, 1863 - (PYRAMIDELLIDAE)
- cylindrella, Volvulella cylindrella (A. Adams, 1862) - (RHIZORIDAE)
- cylindrella, Rissoa cylindrella N.H. Odhner, 1924 - (RISSOIDAE)
- cylindrella, Mayaxis cylindrella (P.M.A. Morelet, 1851) - (SPIRAXIDAE)
- cylindrella, Gonospira cylindrella (C.B. Adams, 1868) - (STREPTAXIDAE)
- Cylindrella, Genus Cylindrella L. Pfeiffer, 1840 (UROCOPTIDAE)
- cylindrella crobylodes, Euphaedusa cylindrella crobylodes (P.B. Schmacker & O. Böttger, 1890) - (CLAUSILIIDAE)
- cylindrella medioglabra, Euphaedusa cylindrella medioglabra (P.B. Schmacker & O. Böttger, 1894) - (CLAUSILIIDAE)
- CYLINDRELLIDAE - syn of Family: UROCOPTIDAE
- cylindrelliformis, Cristataria cylindrelliformis (J.R. Bourguignat, 1855) - (CLAUSILIIDAE)
- Cylindrellina, Genus Cylindrellina E.C. Munier-Chalmas, 1883 (SUBULINIDAE)
- cylindrellus, Scaphander cylindrellus W.H. Dall, 1908 - (SCAPHANDRIDAE)
- cylindrellus, Triphora cylindrellus (W.H. Dall, 1881) - (TRIPHORIDAE)
- cylindrellus, Toxolasma cylindrellus I. Lea, 1868 - (UNIONIDAE)
- cylindriata, Strophiops cylindriata C.J. Maynard & W.F. Clapp, 1920 - (CERIONIDAE)
- cylindrica, Lamellidea cylindrica (E.R. Sykes, 1900) - (ACHATINELLIDAE)
- cylindrica, Volvula cylindrica E.A. Smith, 1872 - syn of: Volvulella acuminata (J.G. Bruguière, 1792) - (ACTEOCINIDAE)
- cylindrica, Volvaria cylindrica (J.G. Bruguière, 1792 †) - (ACTEONIDAE) (FOSSIL)
- cylindrica, Melanochlamys cylindrica T.F. Cheeseman, 1881 - (AGLAJIDAE)
- cylindrica, Amastra cylindrica (W. Newcomb, 1854) - (AMASTRIDAE)
- cylindrica, Ambonychinia cylindrica Isberg, 1934 † - (AMBONYCHIIDAE) (FOSSIL)
- cylindrica, Ancilla ampla cylindrica (G.B. II Sowerby, 1859) - (ANCILLARIIDAE)
- cylindrica, Heteranomia cylindrica J.F. Gmelin, 1791 - syn of: Heteranomia squamula (C. Linnaeus, 1758) - (ANOMIIDAE)
- cylindrica, Barbatia cylindrica W. Wood, 1828 - syn of: Barbatia barbata (C. Linnaeus, 1758) - (ARCIDAE)
- cylindrica, Bulimus cylindrica K.T. Menke, 1828 - syn of: Brephulopsis cylindrica (K.T. Menke, 1828) - (BULIMULIDAE)
- cylindrica, Bulla cylindrica G.S. Helbling, 1779 - syn of: Aliculastrum cylindricum (G.S. Helbling, 1779) - (BULLIDAE)
- cylindrica, Bythinella cylindrica (G.R. von Frauenfeld, 1856) - (BYTHINELLIDAE)
- cylindrica, Strophiops cylindrica C.J. Maynard, 1896 - (CERIONIDAE)
- cylindrica, Bittium cylindrica R.B. Watson, 1886 - (CERITHIIDAE)
- cylindrica, Synthopsis cylindrica C.F. Laseron, 1956 - (CERITHIOPSIDAE)
- cylindrica, Socienna cylindrica (R.B. Watson, 1886) - (CERITHIOPSIDAE)
- cylindrica, Abida cylindrica (A. Michaud, 1829) - (CHONDRINIDAE)
- cylindrica, Abida cylindrica É.A.A. Locard, 1881 - syn of: Abida secale (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- cylindrica, Chondrina cylindrica S.E. Studer in W. Coxe, 1789 - syn of: Chondrina avenacea (J.G. Bruguière, 1792) - (CHONDRINIDAE)
- cylindrica, Cima cylindrica (J.G. Jeffreys, 1856) - (CIMIDAE)
- cylindrica, Clathurella cylindrica É.A.A. Locard & E. Caziot, 1900 - syn of: Raphitoma cylindracea (É.A.A. Locard & E. Caziot, 1900) - (CLATHURELLIDAE)
- cylindrica, Cylindrophaedusa cylindrica (L. Pfeiffer, 1846) - (CLAUSILIIDAE)
- cylindrica, Hypnophila cylindrica É.A.A. Locard, 1894 - syn of: Hypnophila boissii (D. Dupuy, 1850) - (COCHLICOPIDAE)
- cylindrica, Panamicorbula cylindrica J.P.E. Morrison, 1946 - syn of: Panamicorbula ventricosa (Adams & L.A. Reeve, 1850) - (CORBULIDAE)
- cylindrica, Cylichna cylindrica J.G. Bruguière, 1792 - syn of: Cylichna cylindracea (T. Pennant, 1777) - (CYLICHNIDAE)
- cylindrica, Erronea cylindrica (I. von Born, 1778) - (CYPRAEIDAE)
- cylindrica, Erronea cylindrica W.R. Steadman & B.C. Cotton, 1943 - syn of: Erronea cylindrica lenella T. Iredale, 1939 - (CYPRAEIDAE)
- cylindrica, Erronea cylindrica T. Iredale, 1939 - syn of: Erronea cylindrica sowerbyana F.A. Schilder, 1932 - (CYPRAEIDAE)
- cylindrica, Talostolida cylindrica H.M.D. de Blainville, 1826 - syn of: Talostolida teres (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- cylindrica, Cypricardinia cylindrica J.W. Hall & R.P. Whitfield, 1872 † - (CYPRICARDINIIDAE) (FOSSIL)
- cylindrica, Arinia cylindrica J.J. Vermeulen, 1996 - (DIPLOMMATINIDAE)
- cylindrica, Brephulopsis cylindrica (K.T. Menke, 1828) - (ENIDAE)
- cylindrica, Epitonium cylindrica W.H. Dall, 1917 - syn of: Epitonium hindsii (P.P. Carpenter, 1856) - (EPITONIIDAE)
- cylindrica, Eulima cylindrica K.H.J. Thiele, 1925 - (EULIMIDAE)
- cylindrica, Pyramidelloides cylindrica C.F. Laseron, 1956 - syn of: Pyramidelloides mirandus (A. Adams, 1861) - (EULIMIDAE)
- cylindrica, Micromelania cylindrica Lörenthey, 1902 † - (HYDROBIIDAE) (FOSSIL)
- cylindrica, Saganoa cylindrica J.T. Kuroda & T. Habe, 1958 - (HYDROBIIDAE)
- cylindrica, Caspiohydrobia cylindrica (B.M. Logvinenko & Y.I. Starobogatov, 1968) - (HYDROBIIDAE)
- cylindrica, Gingicithara cylindrica (L.A. Reeve, 1846) - (MANGELIIDAE)
- cylindrica, Mangelia cylindrica L.A. Reeve, 1846 - syn of: Gingicithara cylindrica (L.A. Reeve, 1846) - (MANGELIIDAE)
- cylindrica, Hyalina cylindrica (G.B. II Sowerby, 1846) - (MARGINELLIDAE)
- cylindrica, Volvarina cylindrica G.B. II Sowerby, 1846 - syn of: Hyalina cylindrica (G.B. II Sowerby, 1846) - (MARGINELLIDAE)
- cylindrica, Mesoginella cylindrica G.B. II Sowerby, 1846 - syn of: Hyalina cylindrica (G.B. II Sowerby, 1846) - (MARGINELLIDAE)
- cylindrica, Melanopsis cylindrica (F. Stoliczka, 1862 †) - (MELANOPSIDAE) (FOSSIL)
- cylindrica, Lyrcaea cylindrica F. Stoliczka, 1862 † - syn of: Melanopsis cylindrica (F. Stoliczka, 1862 †) - (MELANOPSIDAE) (FOSSIL)
- cylindrica, Michelia cylindrica F.A. Roemer, 1855 † - (MURCHISONIIDAE) (FOSSIL)
- cylindrica, Lithophaga cylindrica (C.F.F. von Krauss, 1848) - (MYTILIDAE)
- cylindrica, Modiolus cylindrica C.F.F. von Krauss, 1848 - syn of: Lithophaga cylindrica (C.F.F. von Krauss, 1848) - (MYTILIDAE)
- cylindrica, Cellana cylindrica (J.F. Gmelin, 1791) - (NACELLIDAE)
- cylindrica, Nucula cylindrica McChesney, 1859 † - syn of: Cardiomorpha missouriensis Shumard & Swallow, 1858 † - (NUCULIDAE) (FOSSIL)
- cylindrica, Cyclodontina cylindrica (F.C. Baker, 1913) - (ODONTOSTOMIDAE)
- cylindrica, Oliva cylindrica F.P. Marrat, 1867 - (OLIVIDAE)
- cylindrica, Volva cylindrica E.A. Smith, 1872 - syn of: Volvulella acuminata (J.G. Bruguière, 1792) - (OVULIDAE)
- cylindrica, Cymbovula cylindrica X.T. Ma, 1997 - syn of: Cuspivolva queenslandica (C.N. Cate, 1974) - (OVULIDAE)
- cylindrica, Patella cylindrica J.F. Gmelin, 1791 - syn of: Cellana cylindrica (J.F. Gmelin, 1791) - (PATELLIDAE)
- cylindrica, Barnea cylindrica J. de C. Sowerby, 1818 - syn of: Barnea candida (C. Linnaeus, 1758) - (PHOLADIDAE)
- cylindrica, Physella gyrina cylindrica W. Newcomb, 1843 - (PHYSIDAE)
- cylindrica, Cowwarrella cylindrica Talent & Philip, 1956 † - syn of: Visitator cylindricum Talent & Philip, 1956 † - (PLATYCERATIDAE) (FOSSIL)
- cylindrica, Tricula cylindrica (R.A.M. Brandt, 1974) - (POMATIOPSIDAE)
- cylindrica, Hubendickia cylindrica R.A.M. Brandt, 1974 - syn of: Tricula cylindrica (R.A.M. Brandt, 1974) - (POMATIOPSIDAE)
- cylindrica, Hinemoa cylindrica (L. de Folin, 1879) - (PYRAMIDELLIDAE)
- cylindrica, Babella cylindrica E. Saurin, 1958 - (PYRAMIDELLIDAE)
- cylindrica, Odostomia cylindrica J. Alder, 1844 - syn of: Jordaniella nivosa (G. Montagu, 1803) - (PYRAMIDELLIDAE)
- cylindrica, Odostomella doliolum cylindrica M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1885 - (PYRAMIDELLIDAE)
- cylindrica, Kermia cylindrica (W.H. Pease, 1860) - (RAPHITOMIDAE)
- cylindrica, Philbertia cylindrica (É.A.A. Locard & E. Caziot, 1898) - (RAPHITOMIDAE)
- cylindrica, Raphitoma cylindrica É.A.A. Locard & E. Caziot, 1900 - syn of: Raphitoma cylindracea (É.A.A. Locard & E. Caziot, 1900) - (RAPHITOMIDAE)
- cylindrica, Volvulella cylindrica (Carpenter, 1865) - (RHIZORIDAE)
- cylindrica, Rhizorus cylindrica (W.M. Gabb, 1873 †) - (RHIZORIDAE) (FOSSIL)
- cylindrica, Rissoella cylindrica (J.G. Jeffreys, 1856) - (RISSOELLIDAE)
- cylindrica, Zebinella cylindrica (H.B. Preston, 1908) - (RISSOINIDAE)
- cylindrica, Rissoina cylindrica L. Bozzetti, 2009 - syn of: Moerchiella bozzettii (M.J. Faber, 2015) - (RISSOINIDAE)
- cylindrica, Ellipsoscapha cylindrica (Gardner, 1916 †) - (SCAPHANDRIDAE) (FOSSIL)
- cylindrica, Rumina cylindrica T.A. de M. Monterosato, 1892 - syn of: Rumina decollata (C. Linnaeus, 1758) - (SUBULINIDAE)
- cylindrica, Triphora cylindrica W.H. Pease, 1871 - (TRIPHORIDAE)
- cylindrica, Trivia cylindrica L. Dolin, 2001 - (TRIVIIDAE)
- cylindrica, Nystia cylindrica A.E.M. Cossmann & M.A. Peyrot, 1918 † - (TRUNCATELLIDAE) (FOSSIL)
- cylindrica, Turritella cylindrica Münster, 1841 † - syn of: Promathildia subornata (Münster, 1841 †) - (TURRITELLIDAE) (FOSSIL)
- cylindrica, Theliderma cylindrica (T. Say, 1817) - (UNIONIDAE)
- cylindrica, Lanceolaria cylindrica (C.T. Simpson, 1900) - (UNIONIDAE)
- cylindrica, Parreysia cylindrica T.N. Annandale & B. Prashad, 1919 - (UNIONIDAE)
- cylindrica, Anodonta cylindrica B. Dewey, 1856 - syn of: Anodontoides ferussacianus (I. Lea, 1834) - (UNIONIDAE)
- cylindrica, Buldowskia cylindrica I.M. Moskvicheva, 1973 - syn of: Anemina arcaeformis (P.M. Heude, 1877) - (UNIONIDAE)
- Cylindrica, syn of: Genus Lanceolaria T.A. Conrad, 1853 (UNIONIDAE)
- cylindrica, Truncatellina cylindrica (A.E.J. Férussac, 1807) - (VERTIGINIDAE)
- cylindrica, Vertigo cylindrica J.E. Gray, 1821 - syn of: Isthmia pygmaea (J.P.R. Draparnaud, 1801) - (VERTIGINIDAE)
- cylindrica, Alcithoe cylindrica J. Marwick, 1926 † - (VOLUTIDAE) (FOSSIL)
- cylindrica, Zebina cylindrica (K.H.J. Thiele, 1925) - (ZEBINIDAE)
- cylindrica costigerella, Truncatellina cylindrica costigerella W.A. Lindholm, 1926 - syn of: Truncatellina cylindrica (A.E.J. Férussac, 1807) - (VERTIGINIDAE)
- cylindrica crassilabris, Arinia cylindrica crassilabris J.J. Vermeulen, 1996 - (DIPLOMMATINIDAE)
- cylindrica kilohanana, Lamellidea cylindrica kilohanana H.A. Pilsbry & C.M. Cooke, 1915 - (ACHATINELLIDAE)
- cylindrica lenella, Erronea cylindrica lenella T. Iredale, 1939 - (CYPRAEIDAE)
- cylindrica parrallela, Volvulella cylindrica parrallela H.A. Pilsbry, 1917 - (RHIZORIDAE)
- cylindrica sowerbyana, Erronea cylindrica sowerbyana F.A. Schilder, 1932 - (CYPRAEIDAE)
- cylindrica strigillata, Theliderma cylindrica strigillata B.H. Wright, 1898 - (UNIONIDAE)
- cylindricum, Anaspyroceras cylindricum (Foerste, 1932 †) - (DAWSONOCERATIDAE) (FOSSIL)
- cylindricum, Gomphoceras cylindricum Barrande, 1865 † - syn of: Umbeloceras cylindricum (Barrande, 1865 †) - (DIESTOCERATIDAE) (FOSSIL)
- cylindricum, Epitonium cylindricum W.H. Dall, 1917 - syn of: Epitonium hindsii (P.P. Carpenter, 1856) - (EPITONIIDAE)
- cylindricum, Aliculastrum cylindricum (G.S. Helbling, 1779) - (HAMINOEIDAE)
- cylindricum, Umbeloceras cylindricum (Barrande, 1865 †) - (MANDALOCERATIDAE) (FOSSIL)
- cylindricum, Phylloceras cylindricum (Sowerby, 1833 †) - (PHYLLOCERATIDAE) (FOSSIL)
- cylindricum, Visitator cylindricum Talent & Philip, 1956 † - (PLATYCERATIDAE) (FOSSIL)
- cylindricum, Stereoplasmoceras cylindricum T. Kobayashi, 1934 † - (STEREOPLASMOCERATIDAE) (FOSSIL)
- cylindricus, Heliacus cylindricus (J.F. Gmelin, 1791) - (ARCHITECTONICIDAE)
- cylindricus, Crassiatractites cylindricus (J. Von Hauer, 1887 †) - (AULACOCERIDA (UNASSIGNED)) (FOSSIL)
- cylindricus, Bellerophon cylindricus C. Gemmellaro, 1889 † - (BELLEROPHONTIDAE) (FOSSIL)
- cylindricus, Euplacostylus cylindricus H.C. Fulton, 1907 - (BOTHRIEMBRYONTIDAE)
- cylindricus, Pseudoperonaeus cylindricus W.K. Weyrauch, 1960 - (BULIMULIDAE)
- cylindricus, Drymaeus cylindricus S.I. Da Costa, 1901 - (BULIMULIDAE)
- cylindricus, Cylindrites cylindricus Morris & Lycett † - (CEPHALASPIDAE) (FOSSIL)
- cylindricus, Abida cylindricus G.L. Hartmann, 1807 - syn of: Abida secale (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- cylindricus, Hypermastus cylindricus (G.B. III Sowerby, 1900) - (EULIMIDAE)
- cylindricus, Clavilithes cylindricus Wrigley † - (FASCIOLARIIDAE) (FOSSIL)
- cylindricus, Phanerophthalmus cylindricus (W.H. Pease, 1861) - (HAMINOEIDAE)
- cylindricus, Atys cylindricus G.S. Helbling, 1779 - syn of: Aliculastrum cylindricum (G.S. Helbling, 1779) - (HAMINOEIDAE)
- cylindricus, Nuculites cylindricus (Portlock) † - (MALLETIIDAE) (FOSSIL)
- cylindricus, Idas cylindricus J. Pelorce & J. Poutiers, 2009 - (MYTILIDAE)
- cylindricus, Modiolus cylindricus C.F.F. von Krauss, 1848 - syn of: Lithophaga cylindrica (C.F.F. von Krauss, 1848) - (MYTILIDAE)
- cylindricus, Sigmataxis cylindricus H.B. Baker, 1935 - (OLEACINIDAE)
- cylindricus, Nisipyrgiscus cylindricus (E. Saurin, 1959) - (PYRAMIDELLIDAE)
- cylindricus, Exomilus cylindricus C.F. Laseron, 1954 - (RAPHITOMIDAE)
- cylindricus, Pyrunculus cylindricus G.Y. Lin & W.L. Wu, 1994 - (RETUSIDAE)
- cylindricus, Tagelus cylindricus G.B. II Sowerby, 1874 - syn of: Tagelus affinis (C.B. Adams, 1852) - (SOLECURTIDAE)
- cylindricus, Solecurtus cylindricus G.B. II Sowerby, 1874 - syn of: Tagelus affinis (C.B. Adams, 1852) - (SOLECURTIDAE)
- cylindricus, Conomurex cylindricus W.J. Swainson, 1821 - syn of: Conomurex decorus (P.F. Röding, 1798) - (STROMBIDAE)
- cylindricus, Trochus cylindricus J.F. Gmelin, 1791 - syn of: Heliacus cylindricus (J.F. Gmelin, 1791) - (TROCHIDAE)
- cylindricus, Urocoptis cylindricus L.W. Dillwyn, 1817 - syn of: Urocoptis cylindrus (L.W. Dillwyn, 1817) - (UROCOPTIDAE)
- cylindricus latior, Heliacus cylindricus latior (S.C.T. Hanley, 1863) - (ARCHITECTONICIDAE)
- cylindriforme, Hebetoceras cylindriforme Flower, 1941 † - (HEBETOCERATIDAE) (FOSSIL)
- cylindriformis, Abida cylindriformis É.A.A. Locard, 1894 - syn of: Abida cylindrica (A. Michaud, 1829) - (CHONDRINIDAE)
- cylindriformis, Eulimella cylindriformis A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- Cylindrina, syn of: Genus Pterygia P.F. Röding, 1798 (MITRIDAE)
- Cylindrina, syn of: Genus Rumina A. Risso, 1826 (SUBULINIDAE)
- Cylindriscala, Genus Cylindriscala De Boury, 1912 (EPITONIIDAE)
- Cylindritella, Genus Cylindritella White, 1887 † (CEPHALASPIDA (UNASSIGNED)) (FOSSIL)
- Cylindrites, Genus Cylindrites Gesner , 1758 † (CEPHALASPIDAE) (FOSSIL)
- Cylindritopsis, Genus Cylindritopsis Gemmellaro , 1889 † (SOLENISCIDAE) (FOSSIL)
- Cylindriturbonilla, syn of: Genus Turbonilla A. Risso, 1826 (PYRAMIDELLIDAE)
- Cylindrobulla, Genus Cylindrobulla P. Fischer, 1857 (CYLINDROBULLIDAE)
- CYLINDROBULLIDAE Thiele, 1931 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-SACOGLOSSA [Order]-OXYNOACEA [Suborder]-CYLINDROBULLOIDEA [Superf)
- Cylindrobullina, Genus Cylindrobullina Ammon, 1878 † (CYLINDROBULLINIDAE) (FOSSIL)
- CYLINDROBULLINIDAE Wenz, 1938 † - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-ACTEONOIDEA [Superfamily]) (FOSSIL)
- Cylindrocaulides, syn of: Genus Leidyula F.C. Baker, 1925 (VERONICELLIDAE)
- Cylindrocaulus, syn of: Genus Leidyula F.C. Baker, 1925 (VERONICELLIDAE)
- Cylindroclavator, Subgenus Clavator (Cylindroclavator) Groh & Poppe, 2002 (ACAVIDAE)
- cylindroconus, Buliminus cylindroconus C.M.F. Ancey, 1886 - syn of: Pseudonapaeus regelianus (C.M.F. Ancey, 1886) - (ENIDAE)
- Cylindrocoptis, Subgenus Tetrentodon (Cylindrocoptis) M.L. Jaume & C. de la Torre, 1972 (UROCOPTIDAE)
- Cylindroenia, syn of: Genus Cylindronenia P. Ehrmann in H.A. Pilsbry, 1949 (CLAUSILIIDAE)
- cylindroides, Arcestes cylindroides Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- cylindroides, Abida cylindroides A. Moquin-Tandon, 1856 - syn of: Abida secale (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- cylindroides, Cylichna cylindroides (G.P. Deshayes, 1824 †) - (CYLICHNIDAE) (FOSSIL)
- cylindroides, Luria cylindroides G.S. Coen, 1949 - syn of: Luria isabella (C. Linnaeus, 1758) - (CYPRAEIDAE)
- cylindroides, Carychium cylindroides Staadt in Cossmann, 1913 † - (ELLOBIIDAE) (FOSSIL)
- cylindroides, Docidoceras cylindroides S.S. Buckman † - (OTOITIDAE) (FOSSIL)
- cylindroides, Turbonilla cylindroides Degrange-Touzin, 1895 † - (PYRAMIDELLIDAE) (FOSSIL)
- cylindroides ambigena, Cylichna cylindroides ambigena G.P. Deshayes, 1862 † - (CYLICHNIDAE) (FOSSIL)
- Cylindromitra, syn of: Genus Pterygia P.F. Röding, 1798 (MITRIDAE)
- Cylindronenia, Genus Cylindronenia P. Ehrmann in H.A. Pilsbry, 1949 (CLAUSILIIDAE)
- Cylindroneniella, Subgenus Cylindronenia (Cylindroneniella) H. Nordsieck 2007 (CLAUSILIIDAE)
- Cylindropalaina, Subgenus Palaina (Cylindropalaina) O.F. von Möllendorff, 1897 (DIPLOMMATINIDAE)
- Cylindrophaedusa, Genus Cylindrophaedusa O. Böttger, 1877 (CLAUSILIIDAE)
- cylindropsis, Eulimella cylindropsis L. de Folin, 1879 - (PYRAMIDELLIDAE)
- cylindrospica, Melanopsis cylindrospica V.V. Anistratenko, 1993 † - (MELANOPSIDAE) (FOSSIL)
- CYLINDROTEUTHIDAE - syn of Family: CYLINDROTEUTHIDIDAE (FOSSIL)
- CYLINDROTEUTHIDIDAE Stolley, 1919 † - Family (CEPHALOPODA-COLEOIDEA [Subclass]-BELEMNITIDA [Order]) (FOSSIL)
- Cylindroteuthis, Genus Cylindroteuthis D'Orbigny, 1842 † (CYLINDROTEUTHIDIDAE) (FOSSIL)
- Cylindrotis, syn of: Genus Auriculastra E.C. Von Martens, 1880 (ELLOBIIDAE)
- Cylindrotruncatum, Genus Cylindrotruncatum Sohl, 1963 † (ACTEOCINIDAE) (FOSSIL)
- Cylindroturbonilla, syn of: Genus Turbonilla A. Risso, 1826 (PYRAMIDELLIDAE)
- Cylindrovertilla, Genus Cylindrovertilla O. Böttger, 1880 (VERTIGINIDAE)
- Cylindrus, syn of: Genus Conus C. Linnaeus, 1758 (CONIDAE)
- Cylindrus, Genus Cylindrus L.I. Fitzinger, 1833 (HELICIDAE)
- cylindrus, Brotia cylindrus (A. Brot, 1886) - (PACHYCHILIDAE)
- cylindrus, Euglandina cylindrus (E.C. Von Martens in J.A. Albers, 1860) - (SPIRAXIDAE)
- cylindrus, Urocoptis cylindrus (L.W. Dillwyn, 1817) - (UROCOPTIDAE)
- cylindrus, Cylindrella cylindrus C.B. Adams, 1845 - syn of: Spirostemma dunkeri (L. Pfeiffer in R.A. Philippi) - (UROCOPTIDAE)
- cylindrus angusta, Euglandina cylindrus angusta F. Haas, 1951 - (SPIRAXIDAE)
- Cylinorophaedusa, Subgenus Hemiphaedusa (Cylinorophaedusa) O. Böttger, 1877 (CLAUSILIIDAE)
- cylinrdicus, Nuculites cylinrdicus (Portlock) † - (MALLETIIDAE) (FOSSIL)
- Cylioceras, Genus Cylioceras Buckman, 1906 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- cylista, Botula cylista S.S. Berry, 1959 - (MYTILIDAE)
- Cyllene, Genus Cyllene J.E. Gray in E. Griffith & E. Pidgeon, 1834 (NASSARIIDAE)
- cyllenica, Codringtonia intusplicata cyllenica (W. Kobelt, 1902) - (HELICIDAE)
- cylleniformis, Enaeta cylleniformis (G.B. I Sowerby, 1844) - (VOLUTIDAE)
- Cyllenina, Genus Cyllenina Bellardi, 1882 † (NASSARIIDAE) (FOSSIL)
- Cyllithea, syn of: Subgenus Vexillum (Costellaria) W.J. Swainson, 1840 (COSTELLARIIDAE)
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