Chelicerata Heymons, 1901 Scorpiones Koch, 1837 - scorpions †Lobosternina Pocock, 1911 1 Superfamily †Isobuthoidea Petrunkevitch, 1913 2 Superfamily †Paraisobuthoidea Kjellesvig-Waering, 1986 3 Superfamily †Loboarchaeoctonoidea Kjellesvig-Waering, 1986 4 Superfamily †Palaeophonoidea Thorell & Lindström, 1885 [monotypic]