Chelicerata Heymons, 1901
   Scorpiones Koch, 1837 - scorpions
     Suborder †Bilobosternina Kjellesvig-Waering, 1986
       Superfamily †Branchioscorpionoidea Kjellesvig-Waering, 1986
         1 Family †Branchioscorpioniidae Dunlop, Penney & Jekel, 2010, orth. inval. [monotypic] see Family Branchioscorpionidae Kjellesvig-Waering, 1986
         2 Family †Dolichophoniidae Dunlop, Penney & Jekel, 2010, orth. inval. [monotypic] see Family Dolichophonidae Petrunkevitch, 1953