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Carchesium is a genus of usually colonial peritrich ciliates in the Vorticellidae with a spirally contractile stalk. The inverted bell-shaped cells have an oral lip as in Epistylis.

The genus has a cosmopolitan distribution in freshwater and is a common part of the fauna of the aerobic stages of waste water treatment plants, such as activated sludge and trickling filters.

References

1. ^ "The World of Protozoa, Rotifera, Nematoda and Oligochaeta". Retrieved 7 January 2023.
2. Manwell, Reginald D. (1968). "16 Ciliophora Fig 16.5". Introduction to Protozoology (2nd ed.). Dover. pp. 331–2. ISBN 978-0-486-61897-5. OCLC 595572282.
3. Martin, D. (August 1968). Microfauna of Biological Filters. University of Newcastle upon Tyne - Department of Civil Engineering. Bulletin. Vol. 39. Oriel Press. p. 38. ISBN 978-0-85362-054-9.

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