Chelicerata Heymons, 1901
Scorpiones Koch, 1837 - scorpions
†Holosternina Kjellesvig-Waering, 1986
Superfamily †Acanthoscorpionoidea Kjellesvig-Waering, 1986
1 Family †Acanthoscorpioniidae Dunlop, Penney & Jekel, 2010, orth. inval. [monotypic]
see Family Acanthoscorpionidae Kjellesvig-Waering, 1986
2 Family †Stenoscorpioniidae Dunlop, Penney & Jekel, 2010, orth. inval. [monotypic]
see Family Stenoscorpionidae Kjellesvig-Waering, 1986