Chordata Bateson, 1885 - chordates
Count: -
   Class †Ostracophori
  Count: [†f] †5o;15f;7g;1s
     Order †Osteostraci Lankester, 1868 - osteostracans see Order Cephalaspidiformes Halstead Tarlo, 1967
    Count: [†f] †5f;2g
       Family †Ateleaspidae Traquair, 1899 [monotypic] see Family Ateleaspididae Traquair, 1899, nom. praeval.
      Count: [†*] †1g
         1 Genus †Ateleaspis Traquair, 1899
        Count: -