vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   †Pteraspidimorphi [paraphyletic]
     †Heterostraci Lankester, 1868, sedis mutabilis - heterostracans
       Family †Ctenaspididae Kiaer, 1930, nom. praeval.
         1 Genus †Zaphoctenaspis Elliott & Blieck, 2010
         2.1 Genus †Ctenaspis Kiaer, 1930
         2.2 Genus †Arctictenaspis Elliott & Blieck, 2010