Species (1.575)
- Cyclidium gemmuliferum Penard 1922
- Cyclidium glaucoma Müller 1773
- Cyclidium granulosum Kahl 1931
- Cyclidium helgolandicum Mansfeld 1922
- Cyclidium heptatrichum Schewiakoff 1893
- Cyclidium lanuginosum Penard 1922
- Cyclidium instabile Clark 1866
- Cyclidium lentiforme Hemprich & Ehrenberg 1831
- Cyclidium longatum Fromentel 1876
- Cyclidium litomesum Stokes 1884
- Cyclidium marinum Borror 1963
- Cyclidium margaritaceum Ehrenberg 1831
- Cyclidium libellus Kahl 1926
- Cyclidium milium Müller 1773
- Cyclidium obliquum Kahl 1926
- Cyclidium muscicola Kahl 1931
- 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
- Cothurniopsis elastica Penard 1914
- 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
- Cryptochilum reniforme Petz, Song & Wilbert 1995
- 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
- Cothurnia fecunda Stokes 1893
- Cothurnia floscularia Perty 1852
- Cothurnia fusiformis Gourret & Roeser 1886
- Cothurnia harpactici Kahl 1933
- Cothurnia gracilis Kent 1882
- Cothurnia havniensis Ehrenberg 1838
- Cothurnia imberis Hemprich & Ehrenberg 1831
- Cothurnia inflata Stokes 1893
- Cothurnia irregularis Kent 1882
- Cothurnia lapponum Penard 1922
- Cothurnia limnoriae Dons 1928
- Cothurnia longipes sensu Voigt 1902
- Cothurnia marina Andrussowa 1886
- Cothurnia maritima Ehrenberg 1838
- Cothurnia minutissima Penard 1914
- Cothurnia nebaliae Dons 1928
- Cothurnia oblonga Kahl 1935
- Cothurnia ovalis Kahl 1933
- Cothurnia operculata Gruber 1879
- Cothurnia ovata Fromentel 1874
- Cothurnia pediculata Dumas 1930
- Cothurnia pedunculata Dons 1918
- Cothurnia plectostyla Stokes 1885
- Cothurnia poculum Kahl 1933
- Cothurnia propinqua Kahl 1933
- Cothurnia sieboldi Stein ?
- Cothurnia spissa Fromentel 1874
- Cothurnia spinosa Labbe 1895
- Cothurnia sinuata Kahl 1933
- Cothurnia variabilis Kellicott 1883
- Cothurnia vas Swarczewsky 1930
- Cothurnia voigti Kahl 1935
- Cothurnia vorticelloides Dumas 1929
- Cyclidium oblongum Kahl 1931
- Cyclidium oligotrichum Kahl 1928
- Cyclidium opisthostoma Grandori & Grandori 1934
- Cyclidium paucisetum Lepsi 1926
- Cyclidium planum Hemprich & Ehrenberg 1831
- Cyclidium pellucidum Kahl 1931
- Cyclidium similans Kahl 1928
- Cyclidium plouneouri Dragesco 1963
- Cyclidium singulare Kahl 1926
- Cyclidium terricola Kahl 1931
- Cyclidium veliferum Kahl 1933