Chelicerata Heymons, 1901 Scorpiones Koch, 1837 - scorpions †Meristosternina Kjellesvig-Waering, 1986 Superfamily †Palaeobuthoidea Kjellesvig-Waering, 1986 [monotypic] Family †Palaeobuthidae Kjellesvig-Waering, 1986 [monotypic] 1 Genus †Palaeobuthus Petrunkevitch, 1913