vertebrates Lamarck, 1801 - vertebrates
see Infraphylum Vertebrata Lamarck, 1801
†Pteraspidimorphi [paraphyletic]
†Heterostraci Lankester, 1868, sedis mutabilis - heterostracans
Family †Cyathaspididae Kiaer, 1932, nom. praeval. [paraphyletic]
Genus †Rachiaspis Soehn, Hanke, Märss & Wilson, 2000, orth. inval., sedis mutabilis
see Genus Rhachiaspis Elliott, 1984