Species (15.149)
- Cymatocylis drygalskii Laackmann 1907
- Cymatocylis ecaudata Kofoid & Campbell 1929
- Cothurnia cypridicola Kahl 1933
- Cothurnia elegans Swarczewsky 1930
- Cothurnia cytherideae Kahl 1933
- Cothurnia elastica Penard 1914
- Cothurnia elongata Fromentel 1874
- Cothurnia exilis Dumas 1930
- Cothurnia fibripes Kahl 1933
- Cothurnia flexa Wailes 1928
- Cothurnia hofkeri Kahl 1933
- Cothurnia putanea Jaworowski ?
- Cothurnia radicosa Dumas 1929
- Cothurnia pyxidiformis D'Udekem 1862
- Cothurnia recurva Claparède & Lachmann 1858
- Cothurnia recurvata Kahl 1928
- Cothurnia regalis Penard 1914
- Cothurnia reniformis Dumas 1929
- Cothurnia richtersi Penard 1914
- Cothurnia rheotypica Stiller 1931
- Cothurnia sahrhagei Kahl 1933
- Cothurnia scyphoides Dumas 1930
- Cothurnia simplex Kahl 1933
- Cothurnia vulgaris Dumas 1930
- Cothurniopsis valvata Stokes 1893
- Cotylothigma rhynchelmis Heidenreich 1935
- Cothurniopsis elastica Penard 1914
- Coxliella atricollium Eicher 1965
- Coxliella coloradoensis Eicher 1965
- Coxliella longa Brandt 1906
- Coxliella mariana Hada 1938
- Cranotheridium ariadnae Penard 1922
- Coxliellina berriasiensis Colom 1948
- Cranotheridium elongatum Penard 1922
- Cranotheridium foliosum Foissner 1983
- Craspedonotana sp. Strand 1928
- Craspedonotus vermicularis Kahl 1926
- Craspedophrya erhardi Rieder 1936
- Crassicalpionella conica Nagy 1989
- Crassichona insolita Jankowski 1973
- Craspedothorax dubius Maupas 1883
- Craterella acuta Kofoid & Campbell 1929
- Craterella aperta Marshall 1934
- Craterella armilla Kofoid & Campbell 1929
- Craterella obscura Brandt 1906
- Craterella oxyura Jörgensen 1924
- Craterella perminuta Hada 1970
- Craterella protuberans Kofoid & Campbell 1929
- Craterella urceolata Ostenfeld 1899
- Craterella torulata Jörgensen 1924
- Craterella retusa Hada 1935
- Crateromorpha mirabilis Perejaslawzewa 1885
- Crateristoma kindi Jankowski 1967
- Craticuloscuta escobari Kozloff 1965
- Crebricoma carinata Raabe 1934
- Cristichona pacifica Jankowski 1973
- Cristichona tesselata Jankowski 1973
- Cristigera cirrifera Kahl 1928
- Cristigera media Kahl 1928
- Cristigera minuta Kahl 1928
- Cristigera constricta Madsen ?
- Cristigera paucisetosa Gourret & Roeser 1888
- Cristigera penardi Kahl 1931
- Cristigera setosa Kahl 1928
- Cristigera vestita Kahl 1928
- Cristigera sulcata Kahl 1933
- Crobylura pelagica André 1914
- Crossacineta ornata Sand ()
- Cryptocaryon irritans Brown 1951
- Crossothamnium perlatum Stiller ()
- Cryptochilidium circuote Fiorentini ()
- Cryptochilidium cuenoti Florentin 1898
- Cryptochilum boreale Hentschel 1924
- Cryptochilum cuenoti Florentin 1898
- Cryptochilum elegans Maupas 1883
- Cryptochilum fusiforme Gourret & Roeser 1886
- Cryptochilum griseolum Perty 1852
- Cryptochilum nigricans Müller ?
- Cryptochilum reniforme Petz, Song & Wilbert 1995
- Cryptochilum tortum Maupas 1883
- Cryptolembus gongi Gunderson 1985
- Cryptonyctus chabaudi Albaret ()
- Cryptopharynx enigmaticum Dragesco 1954
- Cryptopharynx mauritanicum Dragesco 1954
- Cryptopharynx kahli Dragesco 1954
- Cryptopharynx multinucleatum Dragesco 1960
- Cryptopharynx wardi Small & Lynn 1985
- Cyathopercularia laccobii Matthes ()
- Cyclidium amoyensis Nie 1934
- Cyclidium borrori Small & Lynn 1985
- Cyclidium brandoni Kahl 1931
- Cyclidium caudens Kahl 1928
- Cyclidium candens Kahl 1928
- Cyclidium citrullus Cohn 1866
- Cypreostoma woodruffi Jankowski 1969
- Cyrtocaryum halosydnae Faure-Fremiet & Mugard 1949
- Cyrtohymena australis Foissner 1995
- Cyrtohymena balladynula Kahl 1932
- Cothurnia fecunda Stokes 1893
- Cothurnia floscularia Perty 1852