Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Superclass Agnatha Haeckel, 1895 see Class Agnatha Cope, 1889 Class †Diplorhina Haeckel, 1895 see Class Pteraspidomorphi Goodrich, 1909 1 Subclass †Heterostraci Lankester, 1868