Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct. see Subphylum Vertebrata Cuvier, 1812
       Vertebrata (Lamarck, 1801) - vertebrates see Subphylum Vertebrata Cuvier, 1812
         Superclass †Pteraspidomorphi Goodrich, 1909 [monotypic]
           Class †Pteraspidomorphi Goodrich, 1909
             Subclass †Heterostraci Lankester, 1868
               1 ?Genus †Aserotaspis Dineley & Loeffler, 1976
               2 ?Order †Cardipeltida
               3 ?Order †Corvaspidida
               4 ?Order †Lepidaspidida
               5 ?Order †Tesseraspidida
               6 ?Order †Traquairaspidiformes Stensio, 1958
               7 ?Order †Tolypelepidida
               8 Order †Cyathaspidiformes (Kaier, 1930)
               9 Order †Pteraspidiformes Berg, 1940