Chelicerata Heymons, 1901 Scorpiones Koch, 1837 - scorpions †Holosternina Kjellesvig-Waering, 1986 Superfamily †Mesophonoidea Wills, 1910 Family †Centromachidae Petrunkevitch, 1953 [Genus †Pulmonoscorpio Taylor, 2000, orth. inval.] see Genus Pulmonoscorpius Jeram, 1994