Chelicerata Heymons, 1901 Scorpiones Koch, 1837 - scorpions †Holosternina Kjellesvig-Waering, 1986 Superfamily †Spongiophonoidea Kjellesvig-Waering, 1986 1 Family †Praercturidae Dunlop, Penney & Jekel, 2010, orth. inval. [monotypic] see Family Praearcturidae Kjellesvig-Waering, 1986 2 Family †Spongiophonidae Kjellesvig-Waering, 1986 [monotypic]