Species (15.149)
- Oxytricha inquieta Stokes 1887
- Oxytricha islandica Berger & Foissner 1989
- Oxytricha lacrimula Dumas 1929
- Oxytricha lacerata Dumas 1929
- Oxytricha lanceolata Shibuya 1930
- Oxytricha lamella Perty 1852
- Oxytricha longa Gelei & Szabados 1950
- Oxytricha lepus Müller 1773
- Oxytricha longi-caudata Wright 1862
- Oxytricha longicirrata Kahl 1932
- Oxytricha longigranulosa Berger & Foissner 1989
- Oxytricha longipes Dumas 1930
- Oxytricha ludibunda Stokes 1891
- Oxytricha marina Kahl 1932
- Oxytricha luteolucens Dumas 1937
- Oxytricha macrostyla Wrzesniowski 1870
- Oxytricha merula Fromentel 1874
- Oxytricha monspessulana Chatton & Seguela 1940
- Oxytricha multipes Claparède & Lachmann 1858
- Oxytricha protensa Perty 1852
- Oxytricha pseudosimilis Hemberger 1985
- Oxytricha pubes Müller 1773
- Oxytricha pullaster Müller 1773
- Oxytricha retractilis Claparède & Lachmann 1858
- Oxytricha rostrata Dumas 1930
- Oxytricha rubripuncta Berger & Foissner 1987
- Oxytricha salmastra Dragesco & Dragesco-Kernéis 1986
- Oxytricha quercineti Lepsi 1948
- Oxytricha saprobica Kahl 1932
- Oxytricha selvatica Hemberger 1985
- Oxytricha similis Engelmann 1862
- Oxytricha setigera Stokes 1891
- Paradileptus tracheloides Zacharias 1894
- Paradiscophrya astaci Claparède & Lachmann 1859
- Paraenchelys spiralis Foissner 1983
- Paraenchelys terricola Foissner 1984
- Paraenchelys wenzeli Foissner 1984
- Paraeuplotes tortugensis Wichtermann 1942
- Parafavella calycina Jörgensen 1901
- Parafavella acuta Jörgensen 1901
- Parafavella curvata Kofoid & Campbell 1929
- Paraholosticha lichenicola Gellert 1955
- Paraholosticha polychaeta Borror 1966
- Paraholosticha nana Gellert 1955
- Paraholosticha ovata Horvath 1933
- Paraholosticha vitrea Vörösvary 1950
- Parahypocoma collini Chatton & Lwoff 1939
- Parahypocoma rhamphisokarya Burreson 1973
- Paraisotricha ampulia Fiorentini 1890
- Paraisotricha beckeri Hsiung 1930
- Paraisotricha composita Gassovsky 1918
- Paraisotricha colpoidea Fiorentini 1890
- Paraisotricha incisa Fiorentini 1890
- Paramaecidium glaucum Claparède & Lachmann 1859
- Paramecium acutum Dumas 1929
- Paramecium marinum Kent 1881
- Paramecium microstomum Claparède & Lachmann 1859
- Paramecium multimicronucleatum Powers & Mittchell 1910
- Paramecium nucleus Schrank 1803
- Paramecium putrinum Claparède & Lachmann 1859
- Paramecium pyriforme Gourret & Roeser 1886
- Paramitrella caudata Bullington 1940
- Paramphisiella caudata Hemberger 1985
- Paraptychostomum almae Ngassam, Pytorac & Grain 1994
- Pararaabena dentata Wolska 1968
- Parapyxicola ligiae Cuenot 1891
- Parasonderia kahli Faure-Fremiet 1973
- Paraspathidium longinucleatum Czapik & Jordan 1976
- Paraspathidium fuscum Kahl 1928
- Paraspathidium olbiqum Dragesco 1963
- Parastokesia tetraedrica Faure-Fremiet 1924
- Paraspathidium trichostomum Noland 1937
- Parastrongylidium oswaldi Aescht & Foissner 1992
- Parastylonychia pleuneouri Dragesco 1963
- Paratetrahymena soukupae Small & Lynn 1985
- Paracyclidium rhabdotectum Powers 1935
- Paracycloposthium hydrochoeri Cunha 1915
- Paradentacineta cypridinae Collin ()
- Paradexiotricha puytoraci Groliere 1975
- Paradileptus conicus Wenrich 1929
- Paradileptus caducus Kahl 1935
- Paradileptus elephantinus Svec 1897
- Paradileptus robustus Wenrich 1929
- Phyllotrichum striatum Bütschli 1899
- Physaliella collini Penard 1920
- Physalophrya spumosa Kahl 1931
- Physalophrya cylindrica Penard 1922
- Physochona australis Batisse & Crumeyrolle 1988
- Pinchatia chaetophorae Shibuya 1931
- Pingius minutus Hsiung 1932
- Pistillarina cuspidipes Dumas 1929
- Pistillarina cylindrica Dumas 1930
- Pistillarina gracilipes Dumas
- Pistillarina inclinans Dumas 1929
- Pistillarina pectinata Dumas 1929
- Pistillarina radicosa Dumas 1929
- Pistillarina spicula Dumas 1929
- Pistillarina turbinata Dumas 1929
- Pithothorax ovatus Kahl 1926
- Pithothorax processus Kahl 1926