vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   †Pteraspidimorphi [paraphyletic]
     †Heterostraci Lankester, 1868, sedis mutabilis - heterostracans
       Family †Cyathaspididae Kiaer, 1932, nom. praeval. [paraphyletic]
         †Problematic Heterostraci [paraphyletic]
           †Tesselate Heterostraci sedis mutabilis
             1 Genus †Kallostrakon Lankester, 1870, sedis mutabilis
             2 Genus †Oniscolepis Pander, 1856, sedis mutabilis
             3 Genus †Aserotaspis Dineley & Loeffler, 1976, sedis mutabilis
             4 Genus †Aporemaspis Elliott & Loeffler, 1989, sedis mutabilis
             5.1 Genus †Tesseraspis Wills, 1935
             5.2 Genus †Lepidaspis Dineley & Loeffler, 1976