Chelicerata Heymons, 1901 Scorpiones Koch, 1837 - scorpions Orthosternina Pocock, 1911 see Infraorder Orthosterni Pocock, 1911 Superfamily Chactoidea Pocock, 1893 Family Euscorpiidae Laurie, 1896 1 Genus †Eoeuscorpius Kühl & Lourenço, 2017