Class Mammalia Linnaeus, 1758 - mammals Subclass Trechnotheria McKenna, 1975 see Superlegion Trechnotheria McKenna, 1975 Superorder †Dryolestoidea Butler, 1939 1 Order †Dryolestida Prothero, 1981 2 Order †Amphitheriida Prothero, 1981