Plathelminthes see [unranked] Platyhelminthes Gegenbaur, 1859
   Euplathelminthes see [unranked] Rhabditophora Ehlers, 1985
     Acoelomorpha Ehlers, 1985 see Subphylum Acoelomorpha Ehlers, 1985
       1 Nemertodermatida Karling, 1940 - nemertodermatids see Order Nemertodermatida Karling, 1940
       2 Acoela Uljanin, 1870 - acoels see Class Acoela Uljanin, 1870