Chordata Bateson, 1885 - chordates Class †Ostracophori Order †Heterostraci Lankester, 1868 - heterostracans see Subclass Heterostraci Lankester, 1868 Family †Ceraspidae nom. illeg. [monotypic] Genus †Ceraspis Schlüter, 1887, nom. illeg. see Genus Cornaspis Whitley, 1940