Vertebrata Cuvier, 1812 - vertebrates Class Agnatha Cope, 1889 [paraphyletic] Subclass †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorphi Goodrich, 1909 Order †Heterostraci Lankester, 1868 - heterostracans see Subclass Heterostraci Lankester, 1868 Family †Corvaspidae Dineley, 1953 [monotypic] see Family Corvaspididae Dineley, 1953 1 Genus †Corvaspis Woodward, 1934