Paleontology #18
ARTIODACTYLA

Paraxonic feet; double pulley astragalus Early artiodactyls: Palaeodonts Bunodont vs Selenodont teeth Mastoid vs Amastoid skulls: (The Amastoid condition is a derived condition of Suina.) Diversity among artiodactyls Tylopoda: oreodonts, camelids, etc. Background on rumination: Behavioral changes are often the first step in evolving new adaptive traits: Breathing surface air —> Lungs Laying eggs on shore —> Amniote eggs Gnawing —> Rodent incisors Swallowing poorly chewed food, regurgitating later —> Cud-chewing (rumination, "wiederkauer") Ruminant artiodactyls Antlers vs horns Traguloids Cervoids and Giraffoids Bovoids Order CETACEA

· · · • • • • • · · ·

rev. Nov. 2017