Species (15.149)
- Trichoda ovata Ehrenberg 1831
- Trichoda patella Müller 1773
- Trichoda mytilus Müller 1773
- Trichoda pellionella Müller 1773
- Trichoda piscis Müller 1773
- Trichoda proteus Müller 1786
- Trichoda pubes Müller 1773
- Trichoda pullaster Müller 1773
- Trichoda pura Ehrenberg 1831
- Trichoda pyrum Müller 1786
- Trichoda scorpaenae Fabre-Domergue 1888
- Trichoda striata Müller
- Trichoda silurus Müller 1773
- Trichoda succisa Müller 1786
- Trichoda uvula Müller
- Trichodina heterodentata Duncan 1977
- Trichodina labrorum Chatton 1910
- Trichodina patellae Cuenot 1891
- Trichodina polaridiae Fenchel 1965
- Trithigmostoma cucullus Müller 1786
- Trithigmostoma cucullulus Müller 1786
- Trithigmostoma chattoni Mac Dougall 1936
- Trithigmostoma hyalina sensu Srámek-Husek 1952
- Trithigmostoma pituitosus Foissner 1979
- Trithigmostoma marginatus Srámek-Husek 1957
- Thigmogaster schedoeublepharis Dragesco & Dragesco-Kernéis 1986
- Trithigmostoma srameki Foissner 1988
- Trithigmostoma steini Blochmann 1895
- Trochella mobilis Penard 1922
- Trochilia crassa Claparède & Lachmann 1859
- Trochilia dubia Wallengren 1903
- Trochilia fluviatilis Smith 1897
- Trochilia marina Mereschkowsky 1881
- Trochilia filans Faure-Fremiet & Guilcher 1947
- Trochilia palustris Stein 1859
- Trochilia minuta Roux 1899
- Trochilia petrani Dragesco 1966
- Trochilia polonica Wrzesniowski 1870
- Trochilia recta Kahl 1928
- Trochilia sigmoides Dujardin 1841
- Trochilia salina Entz 1879
- Trochilioides bathybius Jankowski 1967
- Trochilia stagnalis Stein 1859
- Trochilia sulcata Claparède & Lachmann 1859
- Trochilioides fimbriata Foissner 1984
- Trochilioides crassa Levander 1894
- Tropidoatractus acuminatus Levander 1894
- Turania vitrea Brodsky 1925
- Tucolesca miriabilis Lom in Corliss 1979
- Turbilina instabilis Enriques 1908
- Trachelostyla spirotrichoides Gellert 1956
- Triadinium caudatum Fiorentini 1890
- Traumatiophtora punctata Chatton & Lwoff 1930
- Triadinium galea Gassovsky 1918
- Triadinium minimum Gassovsky 1918
- Triadinium magnum Hsiung 1935
- Tricaudalia brumpti Buisson 1923
- Trichoda es Müller 1776
- Trichoda gibba Müller 1786
- Trichoda grandinella Müller 1773
- Trichoda i. partim Müller 1776
- Trichoda lyncaster Müller 1776
- Trichoda lynceus Müller 1773
- Trichoda nasamonum Ehrenberg 1831
- Trichoda urinicola Fulton 1923
- Trichoda synaptae Cuenot 1890
- Trichoda vermicularis Müller 1786
- Trichodina asterisci Gruber 1884
- Trichodina baltica Quennerstedt 1869
- Trichodina bidentata Fabre-Domergue 1888
- Trichodina decipiens Laird 1961
- Trichodina domerguei Lom & Laird 1969 ssp. saintjohnsi
- Trichodina galyae Lom & Laird 1969
- Trichodina elizabethae Lom & Laird 1969
- Trichodina grandinella Müller 1773
- Trichodina jarmilae Lom & Laird 1969
- Trichodina mitra Siebold 1850
- Trichodina polycirra Lom 1961
- Trichodina scorpaenae Robin 1879
- Trichodinella sphaeronucleata Lom 1956
- Trichodinella copiosa Lom 1959
- Trichodinella tilapae Duncan 1977
- Trichodinopsis paradoxa Claparède & Lachmann 1858
- Trichodoxa genitalis Sirgel 1983
- Trichogaster pilosus Sterki 1878
- Trichomecium caudatum Fromentel 1874
- Tricholeptus aculeatus Fromentel 1874
- Trichomecium palma Fromentel 1876
- Trichopelma euglenivora Kahl 1926
- Trichopelma eurystoma Kahl 1931
- Trichopelma opaca Kahl 1931
- Trichopelma sphagnetorum Levander 1900
- Trichopelma torpens Kahl 1931
- Trichophrya limax Dumas 1930
- Trichophrya epistylidis Claparède & Lachmann 1859
- Trichophrya fixa Dumas 1937
- Trichophrya pistillaris Dumas 1930
- Trichophrya sinuosa Stokes 1886
- Trichopodiella lachmanni Faure-Fremiet 1957
- Trichopodiella elongta Deroux 1976