Class †Placodermi McCoy, 1848 Order †Arthrodira Woodward, 1891 see [unranked] Arthrodira Woodward, 1891 †Aspinothoracida see [unranked] Aspinothoracidi Stensiö, 1959 Family †mylostomatids? Woodward, 1891 Genus †Tafilalichthys Lehman, 1956 †Tafilalichthys lavocati Lehman, 1954