Chelicerata Heymons, 1901
   Uropygi Thorell, 1882 [monotypic] - whip scorpions see [unranked] Uropygi Thorell, 1882
     Family Thelyphonidae Lucas, 1835
       1 Genus †Burmathelyphonia Wunderlich, 2015
       2 Genus †Mesoproctus Dunlop, 1998
       3 Genus †Mesothelyphonus Cai & Huang, 2017