Ulemosaurus

Ulemosaurus is an extinct genus of dinocephalian therapsids that lived 265 to 260 million years ago, at Isheevo in Russian Tatarstan. It was a tapinocephalid, a group of bulky herbivores which flourished in the Middle Permian. "Ulemosaurus" and other tapinocephalians disappeared at the end of the Middle Permian.
Description.
Only several partial skeletons and skulls have been found. The skull bones are extremely dense: about at its thickest. This thickening is possibly related to head-butting behavior, as some researchers suggest. The species is considered a herbivore, but because the mandible is heavily constructed some palaeontologists consider it a carnivore, with the species being able to use muscle power to cut prey up with its incisors.
Classification.
Ulemosaurus is a large "Moschops"-like form from Russia; it is probably similar enough to be included as a separate species of "Moschops". Despite its advanced characteristics, it lived slightly before the Karoo forms, showing that the Moschopines, and indeed the Tapinocephalidae in general, had already attained their acme by early Capitanian time.