[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 Acoela Uljanin, 1870 - acoels see Class Acoela Uljanin, 1870
         Family Mecynostomidae Dörjes, 1968
           1 Genus Eumecynostomum Faubel & Regier, 1983
           2 Genus Mecynostomum Beneden, 1870
           3 Genus Neomecynostomum Faubel & Regier, 1983
           4 Genus Paedomecynostomum Dorjes, 1968
           5 Genus Paramecynostomum Dorjes, 1968
           6 Genus Philomecynostomum Dorjes, 1968
           7 Genus Postmecynostomum Dorjes, 1968
           8 Genus Pseudmecynostomum Dorjes, 1968