• Callina Hannibal, 1912 (uncertain) [Family: Mollusca (awaiting allocation)]
• Callina Lowe, 1855 (uncertain) [Family: Hygromiidae]
• Calolina Lhoste, 1934 accepted as Calomela Hope, 1840
• Camillina Berland, 1919
• Candollina Van Tieghem, 1895 accepted as Amyema Van Tieghem, 1894
• Capellina accepted as Eubranchus Forbes, 1838
• Caprellina Thomson, 1879
• Caracollina Ehrenberg, 1831
• Carallia Roxburgh, 1811
• Carcelina Mesnil in Lindner, 1944 (uncertain)
• Cardellina Du Bus, 1849
• Carlina Linnaeus, 1753
• Carlopina Reed, 1954 † accepted as Schellwienella Thomas, 1910 †
• Carolana Clarke, 1941
• Carolanna Gordon, 2021
• Carolia Cantraine, 1838 † [Family: Anomiidae]
• Carolia Gray, 1867 accepted as Epizoanthus Gray, 1867 [Family: Epizoanthidae]
• Carolina Borsuk-Bialynicka, 1985 † (uncertain) [Family: Seguenziidae]
• Carolina Engelmann, 1846 accepted as Cavolinia Abildgaard, 1791 [Family: Cavoliniidae]
• Carolina Thomson, 1880 (uncertain) [Family: Scarabaeidae]
• Carolinaia Wilson, 1911
• Carolinea Linnaeus f., 1782 accepted as Pachira Aublet, 1775
• Carollia Gray, 1838
• Carolluta Iredale, 1937 (unaccepted > nomen nudum)
• Carrollia Lutz, 1905 (uncertain)
• Caruelina O. Kuntze, 1891 accepted as Chomelia N.J. Jacquin, 1760
• Catillina Gray, 1868 (uncertain)
• Cavellina Coryell, 1928 † [Family: Cavellinidae]
• Cavellina Maitland, 1897 accepted as Clavelina Savigny, 1816 [Family: Polycitoridae]
• Cavolina Abildgaard, 1791 accepted as Cavolinia Abildgaard, 1791 [Family: Cavoliniidae]
• Cavolina Bruguière, 1791 (uncertain > nomen dubium) [Family: Facelinidae]
• Cavolina Forbes & Hanley, 1851 accepted as Eubranchus Forbes, 1838 [Family: Eubranchidae]
• Collina Bonarelli, 1893 † [Family: Ammonoidea (awaiting allocation)]
• Collina Distant, 1905 (uncertain) [Family: Tibicinidae]
• Collina Jhaveri, 1969 † [Family: Bellerophontidae]
• Collina Urquhart, 1891 [Family: Araneidae]
• Corallina Bucquoy, Dautzenberg & Dollfus, 1882 (uncertain) [Family: Mollusca (awaiting allocation)]
• Corallina Ellis in Krueniz, 1767 (uncertain > nomen dubium) [Family: Sabellidae]
• Corallina Linnaeus, 1758 [Family: Corallinaceae]
• Corallinia Bucquoy & Dautzenberg, 1882 accepted as Ocinebrina Jousseaume, 1880
• Corollina V.S. Maljavkina, 1949 † accepted as Classopollis H.D. Pflug, 1953 †
• Corralina Strand, 1942 (uncertain)
• Crellina Hentschel, 1914 accepted as Crella Gray, 1867