Species (15.149)
- Vorticella echini King 1931
- Naxella minima
- Euplotopsis muscicola ssp. alatus
- Urostyla hologama Heckmann 1965
- Urostyla naumanni Lepsi 1935
- Urostyla polymicronucleata
- Urostyla thompsoni Jankowski 1979
- Urotricha corlissiana Song, Weibo & Wilbert 1989
- Urotricha halteriiformis
- Urotricha multisetosa Wang & Nie 1933
- Urotricha rotunda Fernandez-Leborans & Novillo 1994
- Urotricha tricha Wang & Nie 1933
- Uvelinus ovatus
- Vaginicola pedinculata
- Vaginicola subcrystallina
- Styxophrya quadricornuta Foissner, Schlegel & Prescott 1987
- Uroleptoides atypica Hemberger 1985
- Uroleptoides caudata Hemberger 1985
- Uroleptoides raptans
- Uronychia invicta
- Uroleptus ambiguus
- Uroleptus dubius
- Uroleptus elliptica
- Uroleptus galina
- Uroleptus khali
- Uroleptus magnificus
- Uroleptus poianae
- Uroleptus patens
- Uroleptus ratulus
- Uroleptus roscoviana Maupas 1983
- Uroleptus retractilis Claparède & Lachmann 1858
- Uroleptus ruber
- Uroleptus setiformis
- Ottowphrya magna Foissner 1993
- Uronema castellonensis
- Uronema gallicum
- Uronema parvum
- Uronychia antarctica
- Uronychia paradoxa
- Uronychia unicinata
- Oxytricha flava Cohn 1866 ssp. flava
- Urostrongylum contortum Kahl 1928
- Urostyla coei Turner 1939
- Urostyla gibba
- Urostyla cristata Jerka-Dziadosz 1964
- Urostyla grandis ssp. kahli
- Urostyla grandis ssp. typica
- Urostyla latissima Dragesco 1970
- Urostyla pseudomuscorum
- Urostyla trichota
- Urostyla trichogastra
- Aspidisca jugensis
- Urotricha baltica Czapik & Jordan 1976
- Urotricha fareta
- Urotricha ondina
- Urotricha nais
- Urozona buetschli Schewiakoff 1889
- Urotrychia transfuga
- Urozona bütschlii Schewiakoff 1889
- Usconophrys dauricus
- Vaginicola crystallina ssp. crystallina
- Vaginicola folliculata
- Vaginicola inquilina
- Vaginicola inquillina
- Vaginicola gigantea ssp. gigantea
- Vaginicola longicollis
- Vaginicola longistyla
- Vaginicola pedunculata
- Urceolaria dujardinii
- Urceolaria gaimaridae
- Urceolus ovatus
- Zoothamnium kahlii ssp. kahlii
- Trochilia angustata
- Trochilia pusilla
- Trochilia legumen
- Trochilia sygmoides
- Condylostomides tardus Penard 1922
- Undella armata
- Undella collaria
- Undella attenuata
- Undella hadai
- Undella messinensis
- Undella marsupialis
- Undella tenuirostris
- Undella tridivisa
- Oxytricha balladynula Kahl 1932
- Undellopsis anularis
- Undellopsis cubitum
- Undellopsis entzi
- Undellopsis insignata
- Undellopsis lineata
- Undellopsis subangulata
- Undellopsis tricollaria
- Undellopsis pacifica
- Undellopsis umbilicata
- Trichophrya variabilis
- Trichototaxis caudata Ehrenberg 1838
- Diophrys appendiculata Ehrenberg 1838 ssp. appendiculata
- Tripalmaria dogieli ssp. dogieli
- Tucolescoa mirabilis