Whollydooleya tomnpatrichorum. From Gemma Tarlach on Discover’s Dead Things blog:
Whollydooleya, Wholly for short, is considered a hypercarnivore. While that sounds either like some kind of super predator, or maybe a carnivore with a lot of energy, it just means it ate mostly meat. Not exciting enough for you? Okay, well consider that the description of the animal, published in Memoirs of Museum Victoria, paints a picture of a carnivore weighing around 50 pounds (20-25kg), considerably bigger than a Tassie devil (22 pounds, or 10kg), with teeth capable of shearing through all things munchable and crunchable.
And the evidence?
I know what you’re thinking, where are the photos of this wonderful new Beast of Yore? Wholly is, alas, so far known from a single molar. The tooth has enough highly specialized features, however, to tell researchers a great deal about its size and diet.
Paleontologists are just highly specialized detectives.