Phylum Chordata Bateson, 1885 - chordates
Ref: Zoological Record, 1998
   1 Subphylum †Calcichordata see Class Stylophora Gill & Caster, 1960
  Ref: Zoological Record, 1998
   2 Subphylum Urochordata Bateson, 1885 - tunicates
  Ref: Zoological Record, 1998
   3 Subphylum Cephalochordata Owen, 1846 - lancelets
  Ref: Zoological Record, 1998
   4 Subphylum Vertebrata Cuvier, 1812 - vertebrates
  Ref: Zoological Record, 1998