Phylum: Sarcomastigophora
Sub-phylum: Mastigophora
Class: Zoomastigophora
Order: Trichomonadida
Family: Monocercomoriadidae
Genus: Histomonas
Trichomonadida
- Flagellate protozoa under this order are characterized by presence of 4-6 flagella, one of which may be a trailing flagellum attached to undulating membrane
- Multiplication occurs by binary fission
- Cyst are produced by some forms
- Most of species are non-pathogenic and found in alimentary canal of animals
- Pathogenic forms are classified under two families ‘Monocercomonadidae’ and ‘Trichomonadidae’.
Family: Monocercomonadidae
- Species of this family have three to five flagella directed toward and one trailing flagellum which is usually free
Genus: Histomonas
- Organism is amoeboid with single nucleus
- Shape is spherical or elongated with one flagellum
- A single species ‘Histomonas meleagridis’ is recognized.