Chordata Bateson, 1885 - chordates
Count: -
   Class †Arthrodira Woodward, 1891 - arthrodires see Order Arthrodiriformes Grande & Eastman, 1986
  Count: [†f] †3o;9f;2g
     Order †Arthrothoraci see Order Arthrodiriformes Grande & Eastman, 1986
    Count: [†f] †6f
       Family †Coccosteidae Asmuss, 1856
      Count: -