Species (15.149)
- Cystophrys gemmans Bresslau 1922
- Cyrtostomum leucas Ehrenberg ()
- Cyrtostrombidium longisomum Lynn & Gilron 1993
- Cyttarocylis annulata Daday 1887
- Cyttarocylis obtusa Kofoid & Campbell 1929
- Cyttarocylis ollula Brandt 1906
- Cyttarocylis polymorpha Entz
- Daturella gaussi Kofoid & Campbell 1929
- Daturella ora Kofoid & Campbell 1929
- Dictyocysta dilatata Brandt 1906
- Dictyocysta obtusa Jörgensen 1924
- Dictyocysta pacifica Kofoid & Campbell 1929
- Dictyocysta polygonata Kofoid & Campbell 1929
- Dictyocysta seshaiyai Krishnamurthy & Santhanam 1975
- Dictyocysta speciosa Jörgensen 1924
- Dictyocysta spinosa Kofoid & Campbell 1929
- Dictyocysta templum Haeckel 1873
- Dictyocysta tiara Haeckel 1873
- Cycloposthium plicatocaudatum Strelkow 1939
- Dictyocysta verticosa Hada 1938
- Didesmis ovalis Fiorentini 1890
- Didesmis quadrata Fiorentini 1890
- Didesmis spiralis Hsiung 1929
- Didinium armatum Penard 1922
- Didinium faurei Kahl 1930
- Didinium chlorelligerum Kahl 1935
- Didinium gargantua Meunier 1910
- Didinium cinctum Voigt 1902
- Didinium impressum Kahl 1926
- Didinium nasutum Müller 1773
- Digitophrya digitata Fraipoint 1878
- Dileptus bivacuolatus Cunha 1915
- Dileptus brachiatus Dumas 1929
- Dileptus breviboscis Foissner 1981
- Dileptus calceolus Fromentel 1876
- Dileptus cavicaudus Dumas 1929
- Dileptus cinereus Dumas 1929
- Dendrocometes densus Swarczewsky 1928
- Dexiotricha polystyla Foissner 1987
- Dictyocysta atlantica Herdman, Thompson & Scott 1897
- Blepharisma clarissimum Anigstein 1912 ssp. clarissimum
- Blepharisma lateritia Ehrenberg 1831 ssp. lateritia
- Blepharisma stoltei ssp. stoltei
- Caenomorpha medusula ssp. medusula
- Carchesium aselli ssp. aselli
- Licnophora bassoni Van As & Van As 2000
- Apobryophyllum sulcatum Foissner & Lei 2004
- Chaos intestinalis ssp. intestinalis
- Tetrahymena farleyi Lynn, Gransden, Wright & Josephson 2000
- Cinetoconia crassa ssp. crassa
- Cladotricha koltzowii ssp. koltzowii
- Neobryophyllum penardi Kahl 1931
- Xystonellopsis brandti Laackmann 1909
- Xystonella lanceolata Brandt 1906
- Xystonellopsis cyclas Kofoid & Campbell 1929
- Pleurotricha multinucleata Dragesco 2003
- Paragastrostyla clatratus
- Xystonellopsis clevei Kofoid & Campbell 1929
- Xystonellopsis ornata Brandt 1906
- Acineta harpacticicola
- Acineta hyphydri
- Acineta jolyi
- Acineta laomedeae
- Acineta livadiana Daday 1886
- Acineta lyngbyei
- Acineta macrocaulis
- Trichodina prorocephalusi
- Acineta ligulata
- Acineta karamani
- Acineta labiata
- Acineta maxima
- Acineta poculum
- Acineta papillifera sensu Collin 1912
- Acineta phryganidarum
- Cymatocylis everta Kofoid & Campbell 1929
- Cymatocylis gaussi Kofoid & Campbell 1929
- Cymatocylis folliculus Kofoid & Campbell 1929
- Cymatocylis flava Laackmann 1909
- Cymatocylis glans Kofoid & Campbell 1929
- Cymatocylis incondita Kofoid & Campbell 1929
- Cymatocylis kerguelensis Laackmann 1909
- Cymatocylis labiosa Kofoid & Campbell 1929
- Cymatocylis meridiana Kofoid & Campbell 1929
- Cymatocylis minor Laackmann 1909
- Cymatocylis nobilis Laackmann 1907
- Cymatocylis parva Laackmann 1907
- Cymatocylis ovata Laackmann 1909
- Cymatocylis robusta Laackmann 1909
- Cymatocylis situla Kofoid & Campbell 1929
- Cymatocylis scyphus Kofoid & Campbell 1929
- Cymatocylis simplex Laackmann 1909
- Cymatocylis subconica Kofoid & Campbell 1929
- Cymatocylis tubulosa Kofoid & Campbell 1929
- Cymatocylis typica Laackmann 1909
- Cymatocylis ventricosoides Kofoid & Campbell 1929
- Cymatocylis vanhöffeni Laackmann 1907
- Cymatocylis urnula Laackmann 1909
- Cyrtohymena candens Kahl 1932 ssp. candens
- Cyrtolophosis acuta Kahl 1926
- Cyrtolophosis bivacuolata Vuxanovici 1963