Order †Thecodontia Owen, 1859 see Division Archosauria Cope, 1869 Suborder †Aetosauria Nicholson & Lydekker, 1889 see Order Aetosauria Nicholson & Lydekker, 1889 Family †Stagonolepididae Lydekker, 1887 - aetosaurs Genus †Stagonolepis Agassiz, 1845