Vertebrata Cuvier, 1812 - vertebrates Gnathostomata Class †Placodermi McCoy, 1848 Order †Arthrodira Woodward, 1891 see Order Arthrodiriformes Grande & Eastman, 1986 Suborder †Wuttagoonaspina Ritchie, 1973 [monotypic] 1 Family †Wuttagoonaspidae Ritchie, 1973 [monotypic]