Species (15.149)
- Trichototaxis villaensis Sarmiento & Guerra 1960
- Tricodon biuncinatus Dumas
- Trichototaxis stagnatilis Stokes 1891
- Tricoronella pulchra Blatterer & Foissner 1988
- Trihymena terricola Foissner 1988
- Trimyema alfredkahli Tucolesco 1962
- Trimyema claviformis Kahl 1933
- Trimyema compressa Lackey 1925
- Trimyema kahli Tucolesco 1962
- Trithigmostoma alpestris Foissner 1979
- Triplumaria hamertoni Hoare 1937
- Trochilioides dubia Wallengren 1903
- Trochilioides oculata Kahl 1933
- Trochilioides littoralis Jankowski 1967
- Trochilioides striata Buddenbrock 1920
- Trochilioides recta Kahl 1928
- Trochilioides tenuis Deroux 1976
- Trochilioides trivialis Fenchel 1965
- Trochiliopsis opaca Penard 1922
- Trochiliopsis australis Foissner, Skogstad & Pratt 1988
- Trochochilodon flavum Deroux 1976
- Troglodytella abrassarti Brumpt & Joyeux 1912
- Troglodytella gorillae Reichenow 1917
- Trophogemma poljanskyi Jankowski 1970
- Tucolesca mirabilis Tucolesco 1962
- Trypanococcus rotiferorum Stein 1885
- Turaniella vitrea Brodsky 1925
- Tracheloraphis dicaryon Raikov 1963
- Tracheloraphis enigmaticus Dragesco 1960
- Tracheloraphis flexuosus Raikov & Kovaleva 1968
- Tracheloraphis griseus Kahl 1933
- Tracheloraphis haloetes Borror 1973
- Tracheloraphis hamatus Wright 1982
- Tracheloraphis hyalinum Dragesco 1960
- Tracheloraphis incaudatus Kahl 1933
- Tracheloraphis sarmaticus Agamaliev & Kovaleva 1966
- Tracheloraphis stephani Dragesco 1965
- Tracheloraphis stratius Raikov 1962
- Tracheloraphis sulcata Kovaleva 1966
- Tracheloraphis swedmarki Dragesco 1960
- Tracheloraphis teissieri Dragesco 1960
- Tracheloraphis totevi Kovaleva & Golemanski 1979
- Tracheloraphis vermiformis Raikov 1962
- Trachelostyla affine
- Trachelostyla bryonicolum Gellert 1956
- Trachelostyla caudata Kahl 1932
- Trachelostyla canadensis Buitkamp & Wilbert 1974
- Trachelostyla ciliophorum Gellert 1956
- Trachelophyllum hyalinum Foissner 1983
- Trachelophyllum fontinale Penard 1922
- Trachelophyllum lineola Dumas 1937
- Trachelophyllum pilosum Penard 1922
- Trachelophyllum vestitum Stokes 1884
- Tracheloraphis angustivittata Borror 1973
- Tracheloraphis aragoi Dragesco 1954
- Tracheloraphis beninensis Dragesco & Dragesco-Kernéis 1986
- Tracheloraphis arenicolis Sauerbrey 1928
- Tracheloraphis bodiani Dragesco 1963
- Tracheloraphis caudatus Dragesco & Raikov 1966
- Tracheloraphis conformis Wright 1982
- Tracheloraphis crassus Raikov 1962
- Tracheloraphis coniformis Wright 1982
- Tracheloraphis discolor Raikov 1962
- Tracheloraphis dogieli Raikov 1957
- Vaginicola inclinata Fromentel 1876
- Vaginicola incisa Daday 1907
- Vaginicola lagena Kahl 1935
- Vaginicola tincta Ehrenberg 1830
- Valletofolliculina bicornis Andrews 1953
- Veracineta tisbei Guilcher 1950
- Vesonyctus vachoni Albaret ()
- Vestibulongum corlissi Grim 1988
- Vibrio anser Müller 1773
- Vibrio cygnus Müller 1773
- Vibrio fasciola Müller 1773
- Vibrio olor Müller 1786
- Vinarcon asteris Jankowski 1981
- Vaginicola leptosoma Stokes 1885
- Vaginicola lobata Daday 1907
- Vaginicola longipes Stokes 1894
- Vaginicola ovata Dons /Duj.: 563 1922
- Vaginicola paguri Andre 1910
- Vaginicola pala Swarczewsky 1930
- Vaginicola parva Dumas 1929
- Vaginicola pontica Mereschkowski 1881
- Vaginicola parallela Maskell 1888
- Vaginicola regularis Fromentel 1874
- Vaginicola sediculum Penard 1914
- Vaginicola solitaria Dumas 1929
- Vaginicola swarczewskyi Kahl 1935
- Vaginicola subulata Dujardin 1841
- Vaginicola sulcata Kahl 1928
- Vaginicola terricola Greeff 1888
- Vaginicola undata Dumas 1930
- Vaginicola vas Swarczewsky 1930
- Vaginicola vestita Fromentel 1874
- Vaginicola virgula Penard 1914
- Vaginicola wangi Kahl 1935
- Vasacineta cuspidata Kellicott 1885
- Vasicola annulata Stokes 1895