vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801 Class †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorpha Subclass †Heterostraci Lankester, 1868 Order †Tesseraspidiformes Halstead, 1962 1 Family †Tesseraspididae Berg, 1955, nom. praeval.