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 †Irregulareaspididae Denison, 1964 see Subfamily Irregulareaspidinae Denison, 1964 Genus †Irregulareaspis Zych, 1931 †Irregulareaspis seretensis Novitskaya, 1983