• Candoniella Schneider, 1956
• Caproniella Berlese, 1896 [Family: Ascomycota incertae sedis]
• Caproniella Berlese, 1899 accepted as Capronia P.A. Saccardo, 1883 [Family: Herpotrichiellaceae]
• Casnoniella Csiki, 1932 (unaccepted > nomen nudum) [Family: Coleoptera (awaiting allocation)]
• Casnoniella Liebke, 1938 accepted as Colliuris de Geer, 1774 [Family: Carabidae]
• Castoriella Dworakowska, 1974 (uncertain)
• Catonella Moore & Moore, 1994
• Cattaniella Groenenberg, Subai & Gittenberger, 2016 accepted as Cattania Brusina, 1904
• Catuniella Egorova, 1956 †
• Ceyloniella Wilson, 1924 accepted as Lourinia Wilson, 1924
• Chitoniella P.C. Hennings in Engler & Prantl, 1898 accepted as Clarkeinda O. Kuntze, 1891
• Claytoniella B.A. Yurtsev in B.A. Yurtsev & N.N. Tsvelyov, 1972 accepted as Montia Linnaeus, 1753
• Cottoniella Børgesen, 1919
• Critoniella R.M. King & H. Robinson, 1975