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