vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
Count: [†*] †2o;3f;119g;16s
   †Pteraspidimorphi [paraphyletic]
  Count: [†*] †2o;3f;119g;16s
     †Heterostraci Lankester, 1868, sedis mutabilis - heterostracans
    Count: [†*] †2o;3f;106g;16s
       Family †Cyathaspididae Kiaer, 1932, nom. praeval. [paraphyletic]
      Count: [†*] †2o;1f;102g;13s
         Genus †Boothiaspis Broad, 1973, sedis mutabilis
        Count: -