Chelicerata Heymons, 1901 Scorpiones Koch, 1837 - scorpions Orthosternina Pocock, 1911 see Infraorder Orthosterni Pocock, 1911 Superfamily Chactoidea Pocock, 1893 Family Hemiscorpiidae Pocock, 1893 Genus †Protoischnurus Carvalho & Lourenço, 2001