Chelicerata Heymons, 1901
   Scorpiones Koch, 1837 - scorpions
     †Meristosternina Kjellesvig-Waering, 1986
       Superfamily †Cyclophthalmoidea Thorell & Lindström, 1885
         Family †Cyclophthalmidae Thorell & Lindström, 1885 [monotypic]
           1 Genus †Cyclophthalmus Corda, 1835