[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Appendiculata {Lankester}
         Branch Gnathopoda Straus-Durkheim, 1829
           Grade Condylopoda
             Class Arachnida Lamarck, 1801
               Branch Tracheopulmonata
                 Order Phalangida Bristowe, 1949
                   1 Genus Opilio Herbst, 1798
                   2 Genus Gonyleptus Stein, 1840, nom. null. see Genus Gonyleptes Kirby, 1819