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"T. vaginalis" Colorized SEM
Two T. vaginalis trophozoites. Colorized SEM
Scientific classification Edit this classification
Domain: Eukaryota
Phylum: Metamonada
Subphylum: Trichozoa
(unranked): Parabasalia
Order: Trichomonadida
Brugerolle & Lee 2000

Trichomonadida is an order of anaerobic protists, included with the parabasalids. Members of this order are referred to as trichomonads.

Some organisms in this order include:


Species in this order typically have four to six flagella at the cell's apical pole, one of which is recurrent - that is, it runs along a surface wave, giving the aspect of an undulating membrane. Like other parabasalids, they typically have an axostyle, a pelta, a costa, and parabasal bodies. In Histomonas only one flagellum and a reduced axostyle are found, and in Dientamoeba, both are absent.


Most species are either parasites or other endosymbionts of animals.

Trichomonads reproduce by a special form of longitudinal fission, leading to large numbers of trophozoites in a relatively short time. Cysts never form, so transmission from one host to another is always based on direct contact between the sites they occupy.[1]


The preferred treatment for trichomonad infection is Metronidazole.[2]


  1. ^ Kamaruddin, Mudyawati; Tokoro, Masaharu; Rahman, Md. Moshiur; Arayama, Shunsuke; Hidayati, Anggi P.N.; Syafruddin, Din; Asih, Puji B.S.; Yoshikawa, Hisao; Kawahara, Ei (2014). "Molecular Characterization of Various Trichomonad Species Isolated from Humans and Related Mammals in Indonesia". The Korean Journal of Parasitology. 52 (5): 471–478. doi:10.3347/kjp.2014.52.5.471. PMC 4210728. PMID 25352694.
  2. ^ PreTest Pharmacology (14 ed.). p. 221.

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