Species (15.149)
- Vasichona paguri Jankowski 1972
- Vampyrophrya pelagica Chatton & Lwoff 1930
- Vasicola brevis Tucolesco 1962
- Vasicola ciliata Tatem 1869
- Vasicola gracilis Penard 1922
- Vasicola grandis Penard 1922
- Vasicola ovum Kahl 1926
- Vasicola lutea Kahl 1930
- Vasicola parvula Kahl 1928
- Vasicola procera Tucolesco 1962
- Vasicola vesiculata Tucolesco 1962
- Vauchomia nephritica Mueller 1938
- Velistoma echinometris Biggar & Wenrich ()
- Vautrinella lapparenti Cuvillier & Sacal 1963
- Venodiscophrya lichtensteinii Claparède & Lachmann 1859
- Urostyla intermedia Bergh 1889
- Urostyla marina Kahl 1932
- Urostyla rubra Andrussowa 1886
- Urostyla sphagni Stokes 1886
- Urostyla trichogaster Stokes 1885
- Urostyla vernalis Stokes 1894
- Urostyla urostyla Claparède & Lachmann 1858
- Urotricha agilis Stokes 1886
- Urostyla weissei Stein 1859
- Urostyla viridis Stein 1859
- Urotricha alveolata Kahl 1926
- Urotricha apsheronica Alekperov 1984
- Urotricha biconica Sauerbrey 1928
- Urotricha atypica Alekperov 1993
- Urotricha blatica Czapik & Jordan 1976
- Urotricha castalia Munoz, Tellez & Fernandenz-Galiano 1987
- Urotricha dragescoi Foissner 1984
- Urotricha discolor Kahl 1930
- Urotricha farcta Claparède & Lachmann 1859
- Urotricha globosa Schewiakoff 1892
- Urotricha furcata Schewiakoff 1892
- Urotricha gracilis Penard 1922
- Urotricha hyalina Smith 1897
- Urotricha gyrans Stokes 1887
- Urotricha hexatricha Savi 1913
- Urotricha lagenula Ehrenberg
- Urotricha labiata Edmondson 1920
- Urotricha leenai Krainer 1993
- Urotricha macrostoma Foissner 1983
- Urotricha lemani Foissner, Berger & Kohmann 1994
- Urotricha mamilla Lepsi 1951
- Urotricha marina Mansfeld 1923
- Urotricha matthesi Krainer 1995 ssp. matthesi
- Urotricha matthesi Foissner & Pfister 1997 ssp. tristicha
- Urotricha minkewiczi Schouteden 1906
- Urotricha ovata Kahl 1926
- Urotricha obliqua Kahl 1926
- Urotricha pelagica Kahl 1935
- Urotricha parvula Penard 1922
- Urotricha platystoma Stokes 1886
- Urotricha pusilla Penard 1922
- Urotricha simonsbergeri Foissner, Berger & Schaumburg 1999
- Vaginicola amphorella Maskell 1888
- Vaginicola annulata Stokes 1887
- Vaginicola attenuata Fromentel 1874
- Vaginicola baikalica Swarczewsky 1930
- Vaginicola calceola Dumas 1937
- Vaginicola ceratophylli Penard 1922
- Vaginicola compressa Entz 1884
- Vaginicola cristata Dumas 1929
- Vaginicola crassa Dumas 1929
- Vaginicola doliolum Penard 1914
- Vaginicola dilatata Fromentel 1876
- Vaginicola elegans Swarczewsky 1930
- Vaginicola elongata Fromentel 1874
- Vaginicola gigantea D'Udekem 1862
- Vaginicola globosa D'Udekem 1862
- Vaginicola galericulata Dumas 1929
- Vaginicola grandis Perty 1852
- Turchiniella culicis Grasse & Boissezon 1929
- Tytthocorys coronula Tappan & Loeblich 1968
- Undella anadyomene Entz
- Uncinata gigantea Bullington 1940
- Undella antarctica Hada 1970
- Undella bulla Kofoid & Campbell 1929
- Undella atenuata Jörgensen 1924
- Undella californiensis Kofoid & Campbell 1929
- Undella claparedei Entz 1885
- Undella clevei Jörgensen 1924
- Undella declivis Kofoid & Campbell 1929
- Undella dohrnii Daday 1887
- Urceolaria elongata Fenchel 1965
- Urceolaria heraldica Jankowski 1974
- Urceolaria karyodactyla Laird 1961
- Urceolaria korschelti Zick 1928
- Urceolaria patellae Cuenot 1891
- Urceolaria paradoxa Claparède & Lachmann 1858
- Urceolaria spinicola Beers 1964
- Urceolaria synaptae Cuenot 1890
- Urliella terricola Foissner 1989
- Urocentrum trichocystus Smith 1897
- Urnulella costata Szczechura 1969
- Urochaenia ichthyoides Savi 1913
- Urocyclon chesapeakensis Small & Lynn 1985
- Urocyclon filificus Kahl 1931