Chordata Bateson, 1885 - chordates Class Elasmobranchii Bonaparte, 1838 see Infraclass Elasmobranchii Bonaparte, 1838 Subclass Selachii see Division Selachii Order †Acanthodei Gunnell, 1933 see Class Acanthodii Owen, 1846 [Family †Acanthodidae Agassiz, 1844]