Chelicerata Heymons, 1901
   Uropygi Thorell, 1882 [monotypic] - whip scorpions
     1 [plesion] Genus †Geralinura Scudder, 1884
     2 [plesion] Genus †Parageralinura Tetlie & Dunlop, 2008
     3 [plesion] Genus †Proschizomus Dunlop & Horrocks, 1996
     4 [plesion] Genus †Prothelyphonus Fritsch, 1904
     5 Family Thelyphonidae Lucas, 1835