Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
   Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
     Phylum Acoelomorpha Ehlers, 1985 - acoelomorphs see Subphylum Acoelomorpha Ehlers, 1985
       Acoela Uljanin, 1870 - acoels see Class Acoela Uljanin, 1870
         1 Genus [Paratomella] Dörjes, 1966
         2 Genus [Symsagitiffera] see Genus Symsagittifera Kostenko & Mamkaev, 1990
         3 Genus [Convoluta] Oersted, 1843
         4 Family Diopisthoporidae Westblad, 1940