Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
   Spiralia Schleip, 1929 - spiralians see Superphylum Spiralia Schleip, 1929
     Platyzoa Ax, 1987 see [unranked] Spiralia Schleip, 1929
       Phylum Plathelminthes see Phylum Platyhelminthes Gegenbaur, 1859
         Rhabditophora Ehlers, 1985 see Subphylum Rhabditophora Ehlers, 1985
           Genus Microstomum Schmidt, 1848