Species (15.149)
- Stylonychia clavata
- Oxytricha complanatus Stokes 1887
- Anoplophrya criodrili
- Chaetospira congregata
- Strongylidium contorta
- Strongylidium contorta
- Isosticha contractilis
- Chaetospira cornuta
- Trichoda crinita
- Oxytricha chilensis Bürger 1905
- Holosticha caudatus Stokes 1886
- Urosoma caudatum Stokes 1887
- Oxytricha chlorelligera Kahl 1932
- Holosticha coronata Gourret & Roeser 1888
- Neogeneia costata
- Strongylidium coronatum
- Aspidisca tetracirrata ssp. costata
- Stylonichia capucinus Dumas 1930
- Holosticha crassa Claparède & Lachmann 1858
- Moneuplotes balticus
- Euplotes balteata
- Oxytricha crassistillata Kahl 1932
- Aspidisca caspica
- Euplotes balteatus
- Stylonichia auriformis
- Anthochloe prosperinae Joseph 1882
- Paraholosticha arenivora
- Paraholosticha arenivora
- Euplotes crassus
- Holosticha annulata Kahl 1928
- Euplotoides amieti Dragesco 1970
- Stenotricha arenicola
- Euplotoides agamalievi
- Euplotes arenularum
- Euplotes crassus ssp. minor
- Aspidisca binucleata Kahl
- Stichotricha asensius
- Euplotes alatus
- Moneuplotes crassus Dujardin 1841
- Amphisiella arenicola
- Euplotes mutagens
- Causella shtekhovicensis Koshevoj 1987
- Celeritia globosa Tucolesco 1962
- Paruroleptus musculus Kahl 1932 ssp. simplex
- Holosticha musculus Kahl 1932
- Aspidisca minuta
- Pseudokeronopsis multiplex
- Euplotes minutus
- Holosticha multinucleata Maupas 1883
- Tachysoma monstrosa
- Paradiophrys multinucleata
- Paradiophrys multinucleata
- Pseudokeronopsis multinucleata Maupas 1883
- Chaenia ponticum Lepsi 1926
- Chlamydodontopsis bengalensis
- Holosticha micans
- Laurentia monilata Dragesco & Njiné 1971
- Euplotes modunensis
- Cichlidotherus meanjae Affa'a 1989
- Moneuplotes minuta Yocum 1930
- Oxytricha mirabilis Stokes 1887
- Cinetozona pyriformis Olmo, Tellez & Esteban 1998
- Holosticha milnei Kahl 1932
- Holosticha minima
- Euplotes minima
- Holosticha milnei Kahl 1932
- Euplotes moebiusi
- Holosticha monilata Kahl 1928
- Xiphodysteria spinifera
- Xystonella longicauda ssp. longicauda
- Xystonellopsis conicacauda
- Xystonellopsis favata
- Xystonellopsis pulchra ssp. pulchra
- Yagiua sp.
- Yvonniellina oedelemensis
- Yvonniellina sp. A
- Yvonniellina sp. B
- Yvonniellina variabilis
- Trachelophyllum biacuminatum
- Chaos intestinalis ssp. cordiformis
- Ratulus musculus
- Chervurtskella kolskiensis Koshevoj 1987
- Chilodon cucululus
- Chilodon uncinatus ssp. turritus
- Phialina minima Kahl 1927
- Chilodonella rostrata
- Chitonella chesapeakensis Small & Lynn 1985
- Holosticha musculus Kahl 1932 ssp. simplex
- Strongylidium microstoma Dragesco & Dragesco-Kernéis 1986
- Trichototaxis multinucleatus Burkovsky 1970
- Uronychia multicirrus
- Coniculostomum monilatum Dragesco & Njiné 1971
- Laurentiella monilata Dragesco & Njiné 1971
- Chaetospira monilata
- Bakuella crenata
- Stichotricha aculeata Kahl 1932 ssp. sapropelica
- Tetmemena bifaria
- Urostyla algivora
- Gorgonosoma arbuscula Swarczewsky 1928
- Holosticha alpestris Kahl 1932