Species (437)
- Tachysoma siseris sensu Stiller 1974
- Oxytricha fimbriata Dumas 1930
- Oxytricha fastigata
- Oxytricha quadrinucleata Culberson 1986
- Oxytricha minor sensu Dragesco
- Oxytricha minor Maskell 1887
- Oxytricha praeceps Müller
- Oxytricha sordis Lepsi 1965
- Opisthotricha parallela Maskell 1887 ssp. minor
- Oxytricha pellionella Müller 1786
- Oxytricha granuliferum ssp. quadricirrata
- Oxytricha granuliferum
- Oxytricha pellionella Bürger 1905 ssp. chilensis
- Oxytricha acuminata Stokes 1887
- Oxytricha acuminata Dumas 1930
- Oxytricha acuminata Vuxanovici 1963
- Mitra retractilis Claparède & Lachmann 1858
- Oxytricha acuminata Mahajan 1977
- Tachysoma echinata Claparède & Lachmann 1858
- Oxytricha candens Margalef Lopez 1945 ssp. aestuarii
- Tachysoma persincirra sensu Hemberger 1985
- Steinia inquieta sensu Foissner 1984
- Oxytricha sphagni Kahl 1932
- Oxytricha ovata Kahl 1932
- Oxytricha similis Engelmann 1862
- Onychodromopsis flexilis sensu Petz & Foissner 1996
- Tachysoma furcata sensu Gelei 1954
- Oxytricha sp. Dragesco 1986
- Oxytricha elongata Smith 1897
- Cyrtohymena ovalis Reuter 1961
- Oxytricha incrassata Dujardin 1841
- Urosoma emarginata Stokes 1885
- Urosoma salmastra Dragesco & Dragesco-Kernéis 1986
- Urosoma polynucleata Foissner 1984
- Urosoma similis Foissner 1982
- Oxytricha cultriformis
- Holosticha geleii Wilbert 1986
- Cyrtohymena ferruginea Stein 1859
- Oxytricha formosa Alekperov 1984
- Cyrtohymena macrostoma Groliere 1975
- Rigidocortex octonucleatus Foissner 1988
- Rubrioxytricha haematoplasma Blatterer & Foissner 1990
- Rubrioxytricha ferruginea Stein 1859
- Oxytricha euglenivora Kahl 1932
- Cyrtohymena marina Kahl 1932
- Cyrtohymena simplex Dragesco 1966
- Sterkiella tricirrata Buitkamp 1977
- Oxitricha pelionella Müller 1773
- Opistotricha macrostoma Dragesco 1972
- Opisthotricha paraholophila Wang & Nie 1935
- Steinia feruginea Stein 1859
- Steinia simplex Dragesco 1966
- Gonostomum parvum Lepsi 1947
- Cyrtohymena fenestrata Lepsi 1957
- Oxytricha lundi Dragesco 1970
- Allotricha antarctica Berger 1999
- Plagiotricha affinis Stein 1882
- Plagiotricha strenua Engelmann
- Pseudostrombidium planctonicum Horvath 1933
- Tachysoma balatonica
- Tachysoma dragescoi Song & Wilbert 1997
- Tachysoma parvistyla Stokes 1887
- Tachysoma fusiformis Gelei & Szabados 1950
- Tachysoma hyalinum
- Tachysoma ovata Song & Wilbert 1997
- Onychodromopsis kahli
- Oxytricha minor Kahl 1932
- Oxytricha feruginea Stein 1859
- Oxytricha granulosa Schmitz 1986
- Oxytricha saltans Cohn 1866
- Oxitricha pellionella Müller 1773
- Oxytricha vorax Stokes 1891
- Oxytricha hymenostomata
- Oxytricha pelionella sensu Horvath 1933
- Oxytricha planctontica sensu Wilbert 1986
- Oxytricha proteusa
- Oxytricha saprobia Kahl 1932
- Oxytricha sapropelica Kahl 1932
- Oxytricha strenua Engelmann 1862
- Oxytricha strenuum Engelmann 1862
- Oxytricha tenella
- Gonostomum affinis
- Gonostomum strenua Engelmann 1862
- Gonyostomum semen sensu Schmidt 1916
- Onychodromopsis viridis
- Oxytricha scutum
- Onychodromopsis variabilis
- Urosoma planctonticum Horváth 1933
- Urosoma planctonica sensu Stiller 1974
- Urosoma agilis
- Uroleptus retractilis Claparède & Lachmann 1858
- Oxytricha africana Foissner 1999
- Oxytricha elegans Foissner 1999
- Tachysoma granulifera Berger & Foissner 1987
- Gonostomum namibiense Foissner, Agatha & Berger 2002
- Urosomoida deserticola Foissner, Agatha & Berger 2002
- Urosomoida namibiensis Foissner, Agatha & Berger 2002
- Urosomoida monostyla Foissner, Agatha & Berger 2002
- Vermioxytricha arenicola Foissner, Agatha & Berger 2002
- Urosomoida reticulata Foissner, Agatha & Berger 2002