Carboniferous Colorado

Desmatodon is an extinct genus of diadectid reptiliomorph. With fossils found from the Kasimovian (Missourian) stage of the Late Carboniferous of Pennsylvania, Colorado, and New Mexico in the United States, Desmatodon is the oldest known diadectid, the group of the first known herbivorous tetrapods. Later members obtained larger sizes, with Desmatodon being somewhat smaller, though its actual size is unknown due to the fragmentary nature of the fossils. Two species are currently recognized: the type species D. hollandi and the species D. hesperis.