Class Scorpionida Latreille, 1810 - scorpions
   Order Scorpiones Koch, 1837 - scorpions
     Suborder †Mesoscorpionina (Stockwell, 1989)
       01 Genus †Mesophonus Wills, 1910
       02 Genus †Mazonia Meek & Worthen, 1868
       03 Genus †Heloscorpio Kjellesvig-Waering, 1986
       04 Genus †Phoxiscorpio Kjellesvig-Waering, 1986
       05 Genus †Isobuthus Fritsch, 1904
       06 Genus †Eobuthus Fritsch, 1904
       07 Genus †Eoscorpius Meek & Worthen, 1868
       08 Genus †Pareobuthus Wills, 1959
       09 Genus †Kronoscorpio Kjellesvig-Waering, 1986
       10 Genus †Paraisobuthus Kjellesvig-Waering, 1986
       11 Genus †Telmatoscorpio Kjellesvig-Waering, 1986