Chelicerata Heymons, 1901 see Superclass Chelicerata Heymons, 1901
   Euchelicerata Weygoldt & Paulus, 1979
     [Class] Arachnida Lamarck, 1801
       Pantetrapulmonata Shultz, 2007
         1 [Order] †Trigonotarbida Petrunkevitch, 1949
         2 [Order] †Uraraneida Selden & Shear, 2008
         3 [Order] Araneae Clerck, 1757 - spiders
         4 [Order] †Haptopoda Pocock, 1911
         5 [Order] Amblypygi Thorell, 1883 - whip spiders
         6 [Order] Uropygi Thorell, 1882 - whip scorpions see [unranked] Uropygi Thorell, 1882
         7 [Order] Schizomida Petrunkevitch, 1945 - schizomids