Species (15.149)
- Chilodontopsis depressa Perty 1852
- Colpoda parvifrons Claparède & Lachmann 1859
- Colpoda patella Kahl 1931
- Colpoda penardi Kahl 1931
- Colpoda pigerrima Cohn 1866
- Colpoda praestans Kahl 1931
- Colpoda pirum Müller 1786
- Colpoda quinquecirrata Gellert 1955
- Colpoda ren Müller 1773
- Colpoda reniformis Kahl 1931
- Colpoda rotunda Foissner 1980
- Colpoda rostrum
- Colpoda rouxi Kahl 1926
- Colpoda spiralis Novotny, Lynn & Evans 1977
- Colpoda saprophila
- Colpoda steinii Maupas 1883
- Cometodendron brevimanum Swarczewsky 1928
- Cometodendron longimanum Swarczewsky 1928
- Cometodendron clavatum Swarczewsky 1928
- Cometodendron digitatum Swarczewsky 1928
- Cometodendron palmetta Swarczewsky 1928
- Cometodendron palmettoideum Swarczewsky 1928
- Cometodendron raphanus Swarczewsky 1928
- Cometodendron pendunculatum Swarczewsky 1928
- Cometodendron rhabdophryoideum Swarczewsky 1928
- Cometodendron spissum Swarczewsky 1928
- Cometodendron subtile Swarczewsky 1928
- Compsosomella psammobia Small & Lynn 1985
- Compactum lateritium Hirshfield, Isquith & Bhandary 1965
- Conchacineta constricta Collin ()
- Conchophthirius anodontae Stein 1861
- Conchophthirius metchnikoffi Certes 1891
- Conchophthirius mytilis Morgan 1925
- Conchophthirus anodontae Ehrenberg 1838
- Conchophthirus acuminatus Claparède & Lachmann 1858
- Conchophthirus antedonis Andre 1910
- Conchophthirus curtus Engelmann 1861
- Conchophthirus davidoffi Chatton 1911
- Condylostoma circumpedatum Meunier 1907
- Condylostoma curvum Burkovsky 1970
- Condylostoma enigmaticum Dragesco 1954
- Condylostoma fjeldi Hartwig 1973
- Condylostoma kahli Dragesco 1960
- Condylostoma minuta Dragesco 1954
- Condylostoma minutum Bullington 1940
- Condylostoma minimum Dragesco 1960
- Condylostoma patulum Claparède & Lachmann 1858
- Condylostoma patensis Bory 1826
- Condylostoma remanei Kahl 1932
- Condylostoma psammophilum Bock 1952
- Condylostoma reichi Wilbert & Kahan 1981
- Condylostoma spatiosum
- Condylostoma tardum Penard 1922
- Condylostoma terricola Foissner 1995
- Condylostoma tenuum Faure-Fremiet 1932
- Condylostoma vorticella Ehrenberg 1833
- Condylostoma wangi Foissner & Wölfl 1994
- Condylostomides grolieri Silva Neto 1994
- Apiosoma longiciliare Mytenev 1975
- Conidophrys pilisuctor Chatton & Lwoff 1934
- Coniarcella oedelemensis Keij 1969
- Coniculostomum monilata Dragesco & Njine 1971
- Conidophrys pitelkae Bradbury 1975
- Coniocylis campanula Ehrenberg ()
- Contophrya cachoni Puytorac & Dragesco 1969
- Conocylis helix Meunier 1910
- Contophrya chachoni Puytorac & Dragesco 1969
- Copemetopus subsalsus Villeneuve-Brachon 1940
- Coronodiscophrya prismatica Holm 1928
- Coronothigma gigas Puytorac ()
- Corynacineta tuba Zelinka ()
- Corticocolpoda kaneshiroae Foissner 1993
- Corynophrya symbiotica Kahl 1934
- Cossothigma dubia Dragesco 1954
- Cosmocolpoda naschbergeri Foissner 1993
- Cotensicoma viridis Jankowski 1982
- Cotensicoma manticola Jankowski 1982
- Cotensita commensalis Jankowski 1982
- Cothurnia astaci Stein ?
- Cothurnia arcuata Mereschkowski 1879
- Cothurnia boecki Claparède & Lachmann 1858
- Cothurnia bütschlii Zelinka 1913
- Cothurnia bipartita Penard 1922
- Cothurnia calix Kahl 1933
- Cothurnia castellensis Penard 1914
- Cothurnia camura Dumas 1929
- Cothurnia ceramicola Kahl 1933
- Cothurnia cohnii Kent 1882
- Cothurnia cyathus Jaworowski 1893
- Cothurnia cyclopis Kahl 1933
- Copemetopus chesapeakensis Small & Lynn 1985
- Corallocolpoda grelli Foissner 1993
- Corallocolpoda pacifica Alekperov 1991
- Corallocolpoda terricola Foissner 1993
- Corethria sertulariae Wright 1861
- Cordylostoma glabra Roth 1909
- Cordylosoma glabrum Roth 1909
- Corlissia picta Dragesco 1954
- Coriplites terricola Foissner 1988
- Corixicola coronata Lust 1950