Phylum [Vertebrata] (Lamarck, 1801)
Count: -
   Class Agnatha Cope, 1889
  Count: †4o;1f;11g
     Subclass †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorphi Goodrich, 1909
    Count: †2o;1f;5g
       Order †Heterostraci Lankester, 1868 - heterostracans see Subclass Heterostraci Lankester, 1868
      Count: †1f;4g
         1 Genus †Arandaspis Ritchie & Gilbert-Tomlinson, 1977
        Count: -
         2 Genus †Drepanaspis Schlüter, 1887
        Count: -
         3 Family †Pteraspidae see Family Pteraspididae Claypole, 1885
        Count: -