Chordata Bateson, 1885 - chordates
Count: -
   Class †Arthrodira Woodward, 1891 - arthrodires see Order Arthrodiriformes Grande & Eastman, 1986
  Count: [†f] †3o;9f;2g
     Order †Stegophthalami see Class Placodermi McCoy, 1848
    Count: [†*] †2f;2g
       23 Family †Macropetalichthyidae Eastman, 1898 [monotypic]
      Count: [†*] †1g
       24 Family †Asterosteidae Woodward, 1891 [monotypic]
      Count: [†*] †1g