.95" Permian Reptiliomorph (Desmatodon) Jaw Section - Texas
Desmatodon is the oldest known diadectid. Like most other diadectids, Desmatodon was a terrestrial herbivore that consumed high-fiber plants. Protruding incisiform teeth and a large digestive tract may have allowed the animal to effectively consume and digest plant material. Being the oldest diadectid, Desmatodon also is the oldest known herbivorous land vertebrate.