vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   †Pteraspidimorphi [paraphyletic]
     †Heterostraci Lankester, 1868, sedis mutabilis - heterostracans
       1 Family †Ctenaspididae Kiaer, 1930, nom. praeval.
       2.1 Genus †Cardipeltis Branson & Mehl, 1931
       2.2 Family †Cyathaspididae Kiaer, 1932, nom. praeval. [paraphyletic]