Chelicerata Heymons, 1901
   Ricinulei Thorell, 1876 [monotypic] - ricinuleids
     Suborder †Primoricinulei Wunderlich, 2015
       Family †Hirsutisomidae Wunderlich, 2017 [monotypic]
         1 Genus †Hirsutisoma Wunderlich, 2017