[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Appendiculata {Lankester}
         Branch Gnathopoda Straus-Durkheim, 1829
           Grade Condylopoda
             Class Arachnida Lamarck, 1801
               Metarachnæ
                 Order Tardigrada Doyère, 1840 see Phylum Tardigrada Doyère, 1840
                   1 Genus Arctiscon Schrank, 1803
                   2 Genus Macrobiotus Schultze, 1834