[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] Scorpiones Koch, 1837 - scorpions
         [plesion] Family †Proscorpiidae Scudder, 1885
           1 Genus †Archaeoctonus Pocock, 1911
           2 Genus †Hydroscorpius Kjellesvig-Waering, 1986
           3 Genus †Labriscorpio Leary, 1980
           4 Genus †Proscorpius Whitfield, 1885
           5 Genus †Pseudoarchaeoctonus Kjellesvig-Waering, 1986
           6 Genus †Waeringoscorpio Størmer, 1970