Species (15.149)
- Paramecium bursaria Ehrenberg 1831
- Paramecium biumbonatum Dumas 1929
- Paramecium caudatum Ehrenberg 1833
- Paramecium calkinsi Woodruff 1921
- Paramecium chilodonides Baumeister in Kahl 1931
- Paramecium chrysalis Müller 1786
- Paramecium chlorelligerum Kahl 1935
- Paramecium colpoda Ehrenberg 1831
- Paramecium compressum Ehrenberg 1838
- Paramecium cordiformis Dumas 1929
- Paramecium cucullio Quennerstedt 1867
- Paramecium ellipsoides Dumas 1929
- Paramecium elongatum Dumas 1930
- Paramecium cucumula Dumas 1929
- Paramecium ficarium Kahl 1928
- Paramecium flavum Fromentel 1876
- Paramecium glaucum Claparède & Lachmann 1859
- Paramecium marginatum Dumas 1930
- Paramecium leucas Perty 1852
- Paramecium griseolum Perty 1852
- Paramecium inversum Claparède & Lachmann 1859
- Paramecium milium Müller 1773
- Paramecium nigrum Bürger 1908
- Paramecium nephridiatum Gelei 1925
- Paramecium orbiculare Dumas 1929
- Paramecium ovale Claparède & Lachmann 1859
- Paramecium ovatum Ehrenberg 1830
- Paramecium patella Dumas 1930
- Paramecium polycarium Woodruff 1923
- Paramecium regulare Fromentel 1876
- Paramecium roseum Fromentel 1876
- Paramecium rostratum Dumas 1930
- Paramecium sinaiticum Ehrenberg 1831
- Paramecium sonneborni Aufderheide, Daggett & Nerad 1983
- Paramecium scutellinum Dumas 1929
- Paramecium subovatum Fromentel 1876
- Paramecium sinuosum Dumas 1929
- Paramecium subradiatum Dumas 1929
- Paramecium trichium Stokes 1885
- Paramecium traunsteineri Baumeister in Kahl 1931
- Paramecium viridis Dumas 1930
- Paramecium versutum Perty 1852 ssp. alpina
- Paramecium woodruffi Wenrich 1928
- Parametopus circumlabens Biggar & Wenrich 1932
- Paramphisiella acuta Foissner 1982
- Paranassula microstoma Claparède & Lachmann 1859
- Paranophrys marina Thompson & Berger 1965
- Paranophrys magna Borror 1972
- Paranophrys thompsoni Didier & Wilbert 1976
- Paranyctotherus albareti Ngassam 1983
- Paranyctotherus kirbyi Rodriguez 1939
- Paranoplophrya vivipari Rohrbach 1936
- Paraoxychona inversa Jankowski 1973
- Parapetalotricha meridiana Hada 1970
- Paraplagiopyla kiboko Thurston & Grain 1971
- Parapodophrya soliformis Lauterborn 1908
- Paraprorodon cinctum Foissner 1983
- Paraprorodon morgani Kahl 1930
- Parastylophrya tumidis Gajewskaja ()
- Paratontonia gracillima Faure-Fremiet ()
- Paratetrahymena wassi Thompson 1963
- Paratrichodina incissa Lom 1963
- Pantotricha lagenula Ehrenberg 1838
- Pantotrichum lagenula Ehrenberg 1830
- Pantotrichum volvox Ehrenberg 1830
- Papillorhabdos carchesii Foissner 1984
- Papillorhabdos multinucleata Foissner 1984
- Parabakuella typica Song & Wilbert 1988
- Parablepharisma bacteriophora Villeneuve-Brachon 1940
- Parablepharisma chlamydophorum Kahl 1932
- Parablepharisma collare Kahl 1932
- Parablepharisma kahli Tucolesco 1962
- Parablepharisma pellitum Kahl 1932
- Parabundleia ruminantium Imai & Ogimoto 1983
- Parabryophrya penardi Kahl 1931
- Parachilodonella distyla Wilbert 1971
- Parabursaria pheretima Ghosh 1921
- Parachilodonella lygiae Dragesco 1966
- Paracichlidotherus leeuwenhoeki Grim 1992
- Parachitinoidella cuvillieri Trejo 1972
- Paracineta lauterborni Sondheim 1929
- Paradileptus flagellatus Rousselet 1890
- Paraenchelys n.sp.
- Parafavella cylindrica Jörgensen 1899
- Parafavella denticulata Ehrenberg 1840
- Parafavella digitalis Kofoid & Campbell 1929
- Parafavella dilatata Jörgensen 1899
- Parafavella edentata Brandt 1896
- Parafavella elegans Ostenfeld 1899
- Parafavella gigantea Brandt 1896
- Parafavella greenlandica Kofoid & Campbell 1929
- Parafavella hemifusus Meunier 1910
- Parafavella media Brandt 1896
- Parafavella inflata Kofoid & Campbell 1929
- Parafavella obtusa Aurivillius 1899
- Parafavella parumdentata Brandt 1906
- Parafavella obtusangula Ostenfeld 1899
- Parafavella rotundata Jörgensen 1899
- Parafavella robusta Jörgensen 1901
- Parafavella subedentata Jörgensen 1905