Species (15.149)
- Acineta contorta
- Acineta crater
- Acineta crenata sensu Möbius 1888
- Acineta diademiformis
- Acineta dentata
- Acineta dibdalteria
- Acineta digitata Stein 1859
- Acineta divisa
- Acineta emaciata
- Acineta ferrum ssp. equinum
- Acineta ferrumequinum
- Acineta foetida Maupas 1881
- Circinella arenicola Foissner 1994
- Circinella filiformis Foissner 1982
- Circinella vettersi Berger & Foissner 1989
- Circodinium minimum Gassovsky 1918
- Cirranter mobilis Penard 1922
- Circolagenophrys ampulla Stein 1851
- Cirrhogaster monilifer Ozaki & Yagiu 1942
- Cirrophrya australis Foissner 1993
- Cirrophrya haptica Gellert 1950
- Cirrophrya terricola Foissner 1987
- Cladotricha australis Blatterer & Foissner 1988
- Cladotricha edaphoni Wilbert 1995
- Cladotricha elongata Ruinen 1938
- Cladotricha kahli Ruinen 1938
- Cladotricha halophila Wilbert 1995
- Cladotricha sagittata Ruinen 1938
- Cladotricha n.sp.
- Cladotricha koltzowi Gaievskaia 1926
- Cladotricha sigmoidea Ruinen 1938
- Cladotricha variabilis Ruinen 1938
- Clamidodon stagnalis Dumas 1929
- Clathrostoma pseudoparamecium Kahl 1931
- Claustrofolliculina clausa Hadzi 1951
- Clevelandella augustipennis Yamasaki 1939
- Clevea melchersi Balech 1948
- Clevelandella constrica Kidder 1938
- Clevelandella hastula Kidder 1938
- Clevelandella elongata Kidder 1938
- Clevelandella contorta Kidder 1938
- Clevelandella longicollis Yamasaki 1939
- Clevelandella nipponensis Kidder 1938
- Clevelandella parapanesthidae Kidder 1938
- Clevelandella plantiformis Yamasaki 1939
- Clevelandella panesthiae Kidder 1938
- Clevelandella papilloris Yamasaki 1939
- Clevelandia constricta Kidder 1937
- Clevelandia elongata Kidder 1937
- Clevelandia contorta Kidder 1937
- Clevelandia hastula Kidder 1937
- Clevelandia nipponensis Kidder 1937
- Clevelandia parapanesthiae Kidder 1937
- Clevelandia panesthiae Kidder 1937
- Climacocylis scalaroides Kofoid & Campbell 1929
- Clausophrya oblida Naidenova & Zaika 1969
- Climacocylis elongata Kofoid & Campbell 1929
- Codonella acuta Kofoid & Campbell 1929
- Codonella acerca Jörgensen 1924
- Codonella angusta Kofoid & Campbell 1929
- Codonella annulata Claparède & Lachmann 1858
- Codonella amphorella Biedermann 1893
- Codonella aspera Kofoid & Campbell 1929
- Codonella apicata Kofoid & Campbell 1929
- Codonella australis Kofoid & Campbell 1929
- Codonella benguelensis Kofoid & Campbell 1929
- Chilodon geographicus Penard 1922
- Chilodon muscorum Dumas
- Chilodon propellens Gruber
- Chilodon uncinatus Ehrenberg 1838
- Chilodonella acuta Kahl 1931
- Chilodonella algivora Kahl 1931
- Chilodonella calkinsi Kahl 1928
- Chilodonella aplanata Kahl 1931
- Chilodonella chattoni Mac Dougall 1936
- Chilodonella cucullulus Müller 1786
- Chilodonella curvidens Gruber 1883
- Chilodonella cyprini Moroff 1902
- Chilodonella dorsisuprema Foissner 1980
- Chilodonella elongatus Maskell 1887
- Chilodonella elongata
- Chilodonella geographicus Penard 1922
- Chilodonella fluviatilis Stokes 1885
- Chilodonella gourandi Certes 1891
- Chilodonella gouraudi Certes 1891
- Chilodonella granulata Penard 1922
- Chilodonella hexasticha Kiernik.
- Chilodonella helgolandica Kahl 1931
- Chilodonella labiata Stokes 1891
- Chilodonella sp. Strand 1928
- Chilodonella marginata Srámek-Husek 1957
- Chilodonella megalotrochae Stokes 1884
- Chilodonella osrima Tucolesco 1962
- Chilodonella nana Kahl 1928
- Chilodonella pediculatus Kahl 1928
- Chilodonella pigra Lepsi 1951
- Chilodonella piscatoris Blochmann 1895
- Chilodonella plurivacuolata Deroux & Dragesco 1968
- Chilodonella porcellionis Dogiel & Furssenko 1921
- Chilodonella propellens Engelmann 1878