Plathelminthes see [unranked] Platyhelminthes Gegenbaur, 1859
   Euplathelminthes see [unranked] Rhabditophora Ehlers, 1985
     Rhabditophora Ehlers, 1985 see Subphylum Rhabditophora Ehlers, 1985
       Trepaxonemata see [unranked] Rhabditophora Ehlers, 1985
         Neoophora see Class Neoophora
           Seriata Bresslau, 1933 see Order Seriata
             1 Proseriata Meixner, 1938 see Order Proseriata Meixner, 1938
             2 Tricladida Lang, 1884 see Order Tricladida Lang, 1884