Teraterpeton, an unusual archosauromorph from the Late Triassic of Nova Scotia, Canada (~235-221 mya). Probably around 1m long (3′3″), it was a member of the trilophosaurs, a group of lizard-like archosauromorphs with toothless beaks at the front of their jaws and chisel-like cheek teeth at the back.
It had a very long, thin, rather bird-like snout, with a huge nasal opening, and a euryapsid-type skull with the lower temporal fenestra closed off – a condition seen in some marine reptiles like ichthyosaurs and plesiosaurs, but unique among all its close relatives.
Its forelimbs also had deep narrow blade-like claws, and the rest of its body is only known from fragmentary remains. It was clearly adapted for some sort of highly specialized niche in its ecosystem, but we just don’t yet know what that niche actually was.
Maybe one day we’ll find more complete fossils of this odd animal and get some answers… or even more surprises.