vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801 †Pteraspidimorphi [paraphyletic] †Heterostraci Lankester, 1868, sedis mutabilis - heterostracans Family †Cyathaspididae Kiaer, 1932, nom. praeval. [paraphyletic] †Ariaspis arctata Elliott & Swift, 2010, sedis mutabilis