Paleontology #11b
EARLY MAMMALS

PROTOTHERIA THERIA Derived from Morganucodon Derived from Kuehneotherium Major molar cusps in antrero-posterior rows Major molar cusps in opposing triangles Petrosal bone has anterior lamina exposed inside the orbit Petrosal bone has no such anterior lamina ----- Link to article on an early Haramiyid

· · · • • • • • · · ·

rev. Aug. 2017