Bootherium
Bootherium is an extinct bovid genus from the middle to late Pleistocene of North America which contains a single species, Bootherium bombifrons. Vernacular names for Bootherium include Harlan's muskox, woodox, woodland muskox, helmeted muskox, or bonnet-headed muskox. Bootherium was one of the most widely distributed muskox species in North America during the Pleistocene era. It is most closely related to the modern muskox, from which it diverged around 3 million years ago, it is possibly synonymous with Euceratherium, although this is uncertain.read more