Species (15.149)
- Corlissiella criodrili Heidenreich 1935
- Coronochona pectinata Jankowski 1973
- Cothurnia affinis Kahl 1935
- Cothurnia angusta Kahl 1933
- Cothurnia annulata Stokes 1885
- Cothurnia coarctata Kahl 1933
- Cothurnia collaris Kahl 1933
- Cothurnia compressula Kahl 1933
- Cothurnia cordylophorae Kahl 1933
- Cothurnia cratera Swarczewsky 1930
- Cothurnia curva Stein 1867
- Cothurnia curvula Entz 1884
- Codonella bojiga Eicher 1965
- Codonella brevicollis Daday 1887
- Codonella cistellula Fol 1884
- Codonella cuspidata Kofoid & Campbell 1929
- Codonella cratera Leidy 1877
- Codonella dadayi Kofoid & Campbell 1929
- Codonella elongata Kofoid & Campbell 1929
- Codonella bornandi Daday 1887
- Codonella diomedae Kofoid & Campbell 1929
- Codonella galea Haeckel 1873
- Codonella inflata Kofoid & Campbell 1929
- Codonella lacustris Entz 1885
- Codonella lariana Zacharias 1905
- Codonella lata Kofoid & Campbell 1929
- Codonella mucronata Kofoid & Campbell 1929
- Codonella laticollis Daday 1887
- Codonella nationalis Brandt 1906
- Codonella poculum Brandt 1906
- Codonella recta Kofoid & Campbell 1929
- Codonella robusta Kofoid & Campbell 1929
- Codonella saccus Kofoid & Campbell 1929
- Codonella sphaerica Carazzi 1900
- Codonella tropica Kofoid & Campbell 1929
- Codonellopsis americana Kofoid & Campbell 1929
- Codonellopsis balechi Hada 1970
- Codonellopsis biedermanni Brandt 1906
- Codonellopsis brevicaudata Brandt 1906
- Codonellopsis brasilensis Brandt 1906
- Codonellopsis gaussi Laackmann 1907
- Codonellopsis globosa Kofoid & Campbell 1929
- Codonellopsis inflata Kofoid & Campbell 1929
- Codonellopsis inornata Brandt 1906
- Codonellopsis indica Kofoid & Campbell 1929
- Codonellopsis lagenula Claparède & Lachmann 1858
- Codonellopsis lata Kofoid & Campbell 1929
- Codonellopsis longa Kofoid & Campbell 1929
- Codonellopsis lusitanica Jörgensen 1924
- Codonellopsis tessellata Brandt 1906
- Codonellopsis tropica Kofoid & Campbell 1929
- Codonellopsis tuberculata Daday 1887
- Codonellopsis turbinella Kofoid & Campbell 1929
- Codonellopsis turgescens Kofoid & Campbell 1929
- Codonellopsis turgida Kofoid & Campbell 1929
- Coelosomides teissieri Dragesco 1954
- Coeloperix diremptum Deroux 1976
- Coeloperix disremptum Deroux 1970
- Cohnilembus stichotricha Kahl 1928
- Coelothigma canalis Katashima 1952
- Cohnilembus pusillus Quennerstedt 1869
- Cohnilembus versinus Müller 1786
- Cohnilembus verminus Müller 1786
- Cohnilembus vexillarius Kahl 1926
- Coleps amphacanthus Ehrenberg 1833
- Coleps arenarius Bock 1952
- Coleps arenicolus Dragesco 1965
- Coleps bicuspis Noland 1925
- Coleps dentatus Lepsi 1962
- Coleps fusus Claparède & Lachmann 1859
- Coleps grandis Vacelet 1961
- Colpoda simulans Kahl 1931
- Colpoda steni
- Colpoda striata Müller
- Colpoda tripartita Kahl 1931
- Colpoda triquetra Müller 1786
- Colpoda variabilis Foissner 1980
- Colpodidium caudatum Wilbert 1982
- Colpodidium viridis Mirabdullaev 1986
- Colpodopsis latifrons Gourret & Roeser 1888
- Conchophthirus discophorus Mermod 1914
- Conchophthirus elongatus Ghosh 1918
- Conchophthirus lamellidens Ghosh 1918
- Conchophthirus steenstrupii Stein 1861
- Conchophthirus raabei Kahl 1935
- Condylostentor auriculatus Kahl ()
- Conchoscutum inversum Raabe 1947
- Conchostoma longissimum Faure-Fremiet 1963
- Conchophyllum caryoclada Kidder 1933
- Condylostoma acutum Dragesco 1960
- Condylostoma arenarium Spiegel 1926
- Condylostoma culex Smith 1897
- Condylostoma granulosum Bullington 1940
- Condylostoma longissima Kahl 1928
- Condylostoma luteum Kahl 1932
- Condylostoma magnum Spiegel 1926
- Condylostoma patens Müller 1786
- Condylostoma sphagni Penard 1922
- Condylostoma rugosum Kahl 1932
- Condylostoma stagnale Wrzesniowski 1870