Chordata Bateson, 1885 - chordates Class †Ostracophori Order †Osteostraci Lankester, 1868 - osteostracans see Order Cephalaspidiformes Halstead Tarlo, 1967 Family †Ateleaspidae Traquair, 1899 [monotypic] see Family Ateleaspididae Traquair, 1899, nom. praeval. 1 Genus †Ateleaspis Traquair, 1899