[Panarthropoda] Nielsen, 1995 - panarthropods
   Arthropoda Siebold, 1848 - arthropods see Phylum Arthropoda Siebold, 1848
     Chelicerata Heymons, 1901 see Superclass Chelicerata Heymons, 1901
       Euchelicerata Weygoldt & Paulus, 1979
         1 Xiphosura Latreille, 1802 - horseshoe crabs see Class Xiphosura Latreille, 1802
         2 Arachnida Cuvier, 1812 see Class Arachnida Lamarck, 1801