Chelicerata Heymons, 1901
Count: 2c;12o; †6o;2f;23g
   †Chasmataspidida Caster & Brooks, 1956
  Count: [†g] †2f;10g [24 Dec 2020]
     Family †Diploaspididae Størmer, 1972
    Count: [†g] †9g [24 Dec 2020]
       Genus †Diploaspis Størmer, 1972
      Count: -