Chelicerata Heymons, 1901
Count: 2c;12o; †6o;2f;23g
   Scorpiones Koch, 1837 - scorpions
  Count: [g†g] 15f;5g; †43f;92g [27 Dec 2020]
     †Holosternina Kjellesvig-Waering, 1986
    Count: [†g] †18f;24g [27 Dec 2020]
       Superfamily †Acanthoscorpionoidea Kjellesvig-Waering, 1986
      Count: [†g] †2f;2g [26 Dec 2020]
         1 Family †Acanthoscorpioniidae Dunlop, Penney & Jekel, 2010, orth. inval. [monotypic] see Family Acanthoscorpionidae Kjellesvig-Waering, 1986
        Count: [†g] †1g [26 Dec 2020]
         2 Family †Stenoscorpioniidae Dunlop, Penney & Jekel, 2010, orth. inval. [monotypic] see Family Stenoscorpionidae Kjellesvig-Waering, 1986
        Count: [†g] †1g [26 Dec 2020]