[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Phylum Platyhelminthes Gegenbaur, 1859 - flatworms
     Class Turbellaria Ehrenberg, 1831 - planarians see Subphylum Turbellaria Ehrenberg, 1831
       Order Polycladida Lang, 1884
         01 Family Anonymidae Lang, 1884
         02 Family Callioplanidae Hyman, 1953
         03 Family Cestoplanidae Lang, 1884
         04 Family Cryptocelididae
         05 Family Enantiidae Graff, 1890
         06 Family Euryleptidae Lang, 1884
         07 Family Gnesiocerotidae Marcus & Marcus, 1966
         08 Family Leptoplanidae Lang, 1857
         09 Family Notocirridae
         10 Family Notoplanidae Marcus & Marcus, 1966
         11 Family Planoceridae Lang, 1884
         12 Family Plehniidae Bock, 1913
         13 Family Pleioplanidae Faubel, 1983
         14 Family Polyposthiidae Bergendal, 1893
         15 Family Prosthiostomidae Lang, 1884
         16 Family Pseudocerotidae Lang, 1884
         17 Family Stylochidae Stimpson, 1857
         18 Family Stylochoplanidae Faubel, 1983