Chordata Bateson, 1885 - chordates
Status: extant; Count: -
   Class †Ostracophori
  Status: fossil; Count: [†f] †5o;15f;7g;1s
     Order †Cycliae [monotypic]
    Status: fossil; Count: [†*] †1f;1g;1s
       22 Family †Palaeospondylidae Gill, 1896 [monotypic]
      Status: fossil; Count: [†*] †1g;1s