Chordata Bateson, 1885 - chordates Class †Ostracophori Order †Osteostraci Lankester, 1868 - osteostracans see Order Cephalaspidiformes Halstead Tarlo, 1967 [Family †Tremataspidae Woodward, 1891] see Family Tremataspididae Woodward, 1891, nom. praeval.