vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   Class †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorpha
     Subclass †Heterostraci Lankester, 1868
       Order †Cyathaspidiformes Kiaer, 1930
         Family †Ctenaspididae Kiaer, 1930, nom. praeval.
           1 Genus †Ctenaspis Kiaer, 1930