Species (437)
- Steinia muscorum Kahl 1932
- Steinia primicirrata Berger & Foissner 1987
- Steinia sphagnicola Foissner 1989
- Steinia candens Kahl 1932
- Steinia balladynula Kahl 1932
- Steinia citrina Berger & Foissner 1987
- Steinia ferruginea Stein 1859
- Steinia gracilis Kahl 1932
- Steinia quadrinucleata Dragesco & Njiné 1971
- Steinia sapropelica Kahl 1932
- Steinia tetracirrata Gellert 1942
- Tachysoma agilis Stokes 1887
- Tachysoma dubia Gellert 1956
- Tachysoma humicola Gellert 1957 ssp. humicola
- Tachysoma granuliferum Berger & Foissner 1987
- Tachysoma humicola Foissner 1998 ssp. longisetum
- Tachysoma tricornis Milne 1886
- Stylonychia bifaria Stokes 1887
- Tachysoma agile Stokes 1887
- Tachysoma furcatum Kahl 1932
- Tachysoma hyalina Berger, Foissner & Adam 1984
- Tachysoma micans Engelmann 1862
- Tachysoma longa Hemberger 1985
- Tachysoma mirabile Stokes 1887
- Tachysoma parvistylum Stokes 1887
- Tachysoma raptans Hemberger 1985
- Tachysoma perisincirra Hemberger 1985
- Tachysoma pellionella Müller 1773
- Tachysoma pellionellum Müller 1773
- Tachysoma rigescens Kahl 1932
- Tachysoma saltans Cohn 1866
- Tachysoma terricola Hemberger 1985
- Trichoda lepus Müller 1773
- Trichoda pellionella Müller 1773
- Trichoda pullaster Müller 1773
- Trachelochaeta gonostomoida Hemberger 1985
- Urosoma acuminata Stokes 1887
- Urosoma caudata Stokes 1887
- Urosoma ambigua Dragesco & Dragesco-Kernéis 1986
- Urosoma cienkowski Kowalewski 1882
- Urosoma cienkowskii Kowalewski 1882
- Urosoma gigantea Horváth 1933
- Urosoma longicirrata Kahl 1932
- Urosoma karinae Foissner 1987
- Urosoma macrostyla Wrzesniowski 1870
- Urosoma octonucleata Berger & Foissner 1989
- Urosoma planctonicum sensu Wilbert 1969
- Urosomoida agiliformis Foissner 1982
- Urosomoida agilis Engelmann 1862
- Urosomoida dorsiincisura Foissner 1982
- Urosomoida antarctica Foissner 1996
- Urosomoida minima Hemberger 1985
- Urosomoida n.sp.
- Urosomoida granulifera Foissner 1996
- Urosomoida perthensis Foissner & O'Donoghue 1990
- Uroleptus agilis Engelmann 1862
- Urosoma macrostoma Gellert 1957
- Oxytricha longissima Dragesco & Njine 1971
- Oxytricha maeceps
- Steinia ultricirrata Berger & Foissner 1987
- Tachysoma humicola Gellert 1957
- Urosomoida longa
- Urosoma planctonicum Horvath 1933
- Oxytricha gibba Claparède & Lachmann 1858
- Oxytricha granulifera Foissner & Adam 1983
- Oxytricha lingua Dujardin 1841
- Oxytricha lata Sterki 1878
- Oxytricha matritensis
- Vermioxytricha muelleri Foissner 1986
- Urosoma karini Foissner 1987
- Parurosoma granulifera Berger 1991
- Oxytricha procera Kahl 1932
- Cyrtohymena candens Kahl 1932
- Oxytricha planctonica sensu Wilbert 1986
- Oxytricha plana Gelei & Szabados 1950
- Oxytricha phytophaga Gelei & Szabados 1950
- Hemiurosoma polynucleata Foissner 1984
- Kerona multipes Fromentel 1876
- Oxytricha magna Gelei & Szabadosz 1950
- Oxytricha mistacea
- Oxytricha multiseta Dragesco 1966
- Oxytricha minima Dragesco 1970
- Oxytricha cypris Dumas 1929
- Oxytricha dragescoi Stiller 1974
- Cyrtohymena torrenticola Sramek-Husek 1957
- Oxytricha bivacuolata
- Cyrtohymena sapropelica Kahl 1932
- Oxytricha pernix Wrzesniowski 1877
- Oxytricha parvistyla Stokes 1887
- Oxytricha ovata Kahl 1932
- Oxytricha oltenica Lepsi 1965
- Oxytricha radians Dujardin 1841
- Oxytricha oblongua
- Oxytricha oblongatus Sharma, Sobti & Kasthuria 1986
- Oxytricha nuptacina
- Oxytricha nova Klobutcher et al. 1981
- Oxytricha monstrosa Vuxanovici 1963
- Gonostomum gonostomoida Hemberger 1985
- Gonostomum mereschkowskii Lepsi 1929
- Cyrtohymena aestuarii Margalef Lopez 1945