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
         Order †Pteraspidiformes Berg, 1940
        Count: [†*] †44g;4s
           [Suborder] †Psammosteida Kiaer, 1932 see Suborder Psammosteoidei Kiaer, 1932
          Count: [†*] †5g
             Genus †Psammolepis Agassiz, 1844, sedis mutabilis
            Count: -