vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801 Class †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorpha Subclass †Heterostraci Lankester, 1868 Order †Cyathaspidiformes Kiaer, 1930 Family †Poraspididae Kiaer, 1932 see Subfamily Poraspidinae Denison, 1964 1 Genus †Poraspis Kiaer, 1930