Phylum Sarcomonada Cavalier-Smith, 1993 see Class Sarcomonadea Cavalier-Smith, 1993
   Class Cercomonadea K.A. Mikrjukov, 2000 see Class Sarcomonadea Cavalier-Smith, 1993
     Order Dimorphida Siemensma, 1991 see Order Heliomonadida Cavalier-Smith, 1993
       Genus Tetradimorpha Hsiung, 1927
         1 Tetradimorpha radiata Hsiung, 1927
         2 Tetradimorpha tetramastix (Penard, 1921) Siemensma, 1991
         3 Tetradimorpha pterbica Mikrjukov & Patterson, in Mikrjukov, 2000 see Tetrahelia pterbica (Mikrjukov & Patterson, 2000)
         4 Tetradimorpha marina Fenchel et al., 1995 see Pseudodimorpha marina (Fenchel et al., 1995) K.A. Mikrjukov, 2000