[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       Pantetrapulmonata Shultz, 2007
         01 ?Genus †Ecchosis Selden & Shear, 1991
         02 ?Genus †Eocteniza Pocock, 1911
         03 ?Genus †Idmonarachne Garwood, Dunlop, Selden, Spencer, Atwood, Vo & Drakopoulos, 2016
         03 ?Genus †Protocteniza Petrunkevitch, 1949
         04 ?Genus †Rakovnicia Kušta, 1884
         05 ?Genus †Saccogulus Dunlop, Fayers, Hass & Kerp, 2006
         06 ?Genus †Xenarachne Dunlop & Poschmann, 1997
         07 [Order] †Trigonotarbida Petrunkevitch, 1949
         08 [Order] †Uraraneida Selden & Shear, 2008
         09 [Order] Araneida Clerck, 1757 - spiders
         10 [Order] †Haptopoda Pocock, 1911 [monotypic]
         11 [Order] Amblypygi Thorell, 1883 - whip spiders
         12 [Order] Uropygi Thorell, 1882 [monotypic] - whip scorpions
         13 [Order] Schizomida Petrunkevitch, 1945 - schizomids