Therocephalians were ancient mammal-like reptiles that lived during the Permian and the Triassic epocs and which were related both to gorgonopsids and cynodonts. They were featured in the last episode of Walking with Monsters where they hunted lystrosaurs (and also the episode 4x04 of Primeval). It later then evolved into a Cynodont in the Mid-Triassic
Vicious nocturnal hunters, these predators didn’t rely on power to make a kill. Their attacks were swift and at first appeared unsuccessful, but these predators had a secret weapon: a venomous bite, with venom being more lethal and more powerful than a black mamba’s, which could flood their prey’s blood stream.
In the show, they were featured possessing venomous bites, supposedly more powerful than the modern venomous snakes, such as the black mamba. Still, only one species of therocephalian has been deduced to be venomous, i.e. Euchambersia, which would problably mean that the one appearing in Walking With Monsters was one. However, the presence of the venom in those mammal-like reptiles is speculation, as that cannot be proven via fossilised bones.
- Walking with Monsters