Chelicerata Heymons, 1901 Scorpiones Koch, 1837 - scorpions †Lobosternina Pocock, 1911 Superfamily †Isobuthoidea Petrunkevitch, 1913 Family †Eoscorpiidae Scudder, 1884 Genus †Trachyscorpio Kjellesvig-Waering, 1986