[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 Catenulida Meixner, 1924 - catenulid flatworms
         Family Retronectidae Sterrer & Rieger, 1974
           1 Genus Retronectes Sterrer & Rieger, 1974