vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   †Pteraspidimorphi [paraphyletic]
     †Heterostraci Lankester, 1868, sedis mutabilis - heterostracans
       Family †Cyathaspididae Kiaer, 1932, nom. praeval. [paraphyletic]
         [Order] †Traquairaspidida Stensiö, 1958
           1 Genus †Traquairaspis Kiaer, 1932
           2.1 Genus †Munchoaspis Tarrant, 1991
           2.2.1 Genus †Toombaspis Randle, 2017, nom. ined., orth. inval. see Genus Toombsaspis Tarrant, 1991
           2.2.2 Genus †Phialaspis Wills, 1935