Chelicerata Heymons, 1901 Scorpiones Koch, 1837 - scorpions †Holosternina Kjellesvig-Waering, 1986 Superfamily †Spongiophonoidea Kjellesvig-Waering, 1986 Family †Praercturidae Dunlop, Penney & Jekel, 2010, orth. inval. [monotypic] see Family Praearcturidae Kjellesvig-Waering, 1986 Genus †Praearcturus Woodward, 1871