Chelicerata Heymons, 1901
   Scorpiones Koch, 1837 - scorpions
     †Holosternina Kjellesvig-Waering, 1986
       Superfamily †Mesophonoidea Wills, 1910
         Family †Mazoniidae Petrunkevitch, 1913 [monotypic]
           1 Genus †Mazonia Meek & Worthen, 1868