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 Genus †Poraspis Kiaer, 1930 †Poraspis brevis Kiaer & Heintz, 1935