PterogaulusPterogaulus is a genus of mylagauline rodent from Miocene North America.DescriptionSimilar to other members of Mylagaulidae, Pterogaulus was fossorial, living in underground burrows. These burrows could be as long as 7 meters in length, and were similar in construction to modern gophers. Despite being grouped closely with the horned Ceratogaulus, Pterogaulus lacks any indication of nasal horns. The post-orbital processes are large, and the premolars bear a small depression. The fourth premolar in particular has a branched pattern, with an antero-posteriorly elongated enamel lake.ClassificationPterogaulus is grouped with the derived subfamily Mylagaulinae within Mylagaulidae, closest to the genus Umbogaulus.