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Trichomonas Giemsa DPDx.JPG
Scientific classification
Domain: Eukaryota
(unranked): Excavata
Phylum: Metamonada
Class: Parabasalia
Order: Trichomonadida
Family: Trichomonadidae
Genus: Trichomonas

Trichomonas is a genus of anaerobic excavates that are parasites of vertebrates. They are included with the Parabasalids.

The best-known species is Trichomonas vaginalis, a common inhabitant of the vagina of human females. It travels along the mucus coated lining of the reproductive and urinary tract of its hosts by moving its flagella and by undulating part of its plasma membrane. If the normal acidity of the vagina is disturbed, T. vaginalis can outcompete beneficial microbes and infect the vagina lining. Such infection, which can be sexually transmitted, can also occur in the urethra of males, though often without symptoms. Genetics studies of T. vaginalis suggests that the species became pathogenic when some of these Parabasalids acquired a particular gene through horizontal gene transfer from bacteria that also dwell in the vagina. The gene allows T. vaginalis to feed on epithelial cells, resulting in infection.

Species of Trichomonas include:

Restoration of a Tyrannosaurus with Trichomonas-like infections.


  1. ^ Wolff, E.D.S.; Salisbury, S.W.; Horner J.R. & Varricchio D.J. (2009). Hansen, Dennis Marinus, ed. "Common Avian Infection Plagued the Tyrant Dinosaurs". PLoS ONE. 4 (9): e7288. doi:10.1371/journal.pone.0007288. PMC 2748709Freely accessible. PMID 19789646. 
  2. ^ "Kingdom Protista". Biology 1AL Laboratory Manual. UC Berkeley. Fall 2011. p. 42. 
  3. ^ Trager, William (April 1934). "The Cultivation of a cellulose-digesting flagellate, Trichomonas termopsidis, and of certain other termite protozoa". The Biological Bulletin. 66 (2): 182–190. doi:10.2307/1537331. 

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