organisms
 see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
  
 Domain eukaryotes
 see Domain Eukaryota Chatton, 1925
    
 flagellated protists
      
 Phylum Parabasalia Honigberg, 1973
 see Infraphylum Parabasalia Honigberg, 1973
        
 Class Trichomonada
 see Class Trichomonadea Kirby, 1947
          
 Order Trichomonadida Kirby, 1947 - trichomonads
            
 Family Monocercomonadidae Kirby, 1944
              
 Subfamily Monocercomonadinae Kirby, 1944
 see Family Monocercomonadidae Kirby, 1944
                
 Genus Tetratrichomastix Mackinnon, 1913
 see Genus Hexamastix Alexeieff, 1912