Arthropoda Siebold, 1848 - arthropods
   Euarthropoda
     Subphylum Chelicerata Heymons, 1901
       Euchelicerata Weygoldt & Paulus, 1979
         Prosomapoda Lamsdell, 2013
           Planaterga Lamsdell, 2013
             Dekatriata Lamsdell, 2013
               Sclerophorata Kamenz, Staude & Dunlop, 2011
                 1 Arachnida Lamarck, 1801
                 2 †Eurypterida Burmeister, 1843 - sea scorpions