[Kingdom] Animalia Linnaeus, 1758 - animals
Status: extant
   Grade Enterozoa
  Status: extant
     Grade Cœlomata
    Status: extant
       Phylum Appendiculata {Lankester}
      Status: extant
         Branch Gnathopoda Straus-Durkheim, 1829
        Status: extant
           Grade Condylopoda
          Status: extant
             Class Arachnida Lamarck, 1801
            Status: extant
               Branch Branchiopulmonata
              Status: extant
                 Order Trilobitina
                Status: extant
                   1 Genus Phacops Emmrich, 1839
                  Status: extant
                   2 Genus Ilenus Rafinesque, 1832, nom. null. see Genus Illaenus Dalman, 1827
                  Status: extant