trichomonadidae trichomonadidae trichomonadidae is a family of anaerobic protozoa. many of its members are parasitic, causing disease in humans or domestic animals. trichomonadidae two trophozoites of trichomonas vaginalis stained with giemsa scientific classification domain: eukaryota phylum: metamonada subphylum: trichozoa (unranked): parabasalia order: trichomonadida family: trichomonadidae genera cochlosoma lacusteria pentatrichomonas pentatrichomonoides pseudotrypanosoma tetratrichomonas trichomitopsis trichomonas