Chelicerata Heymons, 1901
Count: 2c;12o; †6o;2f;23g
   †Eurypterida Burmeister, 1843 - eurypterids
  Count: [†g] †21f;73g [26 Dec 2020]
     †Stylonurina Diener, 1924
    Count: [†g] †8f;27g [25 Dec 2020]
       Superfamily †Mycteropoidea Cope, 1886
      Count: [†g] †3f;10g [25 Dec 2020]
         Family †Hibbertopteridae Kjellesvig-Waering, 1959
        Count: [†g] †6g [25 Dec 2020]
           Genus †Vernonopterus Waterston, 1968
          Count: -