Euchambersia

Euchambersia was a therocephalian therapsid that lived during the Late Permian epoch, approximately 250 million years ago, in what is now South Africa.

Description
Euchambersia was a unique therocephalian. It apparently had venom glands connected to its canine teeth. Like snakes, the teeth of Euchambersia were adapted to inject venom to kill its prey. A recess behind each canine tooth housed the venom gland, while grooves down the outer sides of the canine teeth delivered the venom into the puncture wound,[1] together with powerful jaws this made it a very efficient predator to hunt the herbivorious dicynodonts and pareiasaurs it encountered.

In popular culture
Euchambersia made an appearance in Walking with Monsters. Here, identified as a therocephalian, it was seen hunting Lystrosaurus in packs while the herd passed through a canyon. It is depicted as being nocturnal and having venom more potent than that of a black mamba. The model used for the Euchambersia was the same model that was used for the Thrinaxodon that appeared in the first episode of Walking with Dinosaurs.