Teraterpeton (meaning "wonderful creeping thing" in Greek) is an extinct genus of trilophosaurid[1] archosauromorphs.

It has many unique features seen in no other related form, including an elongated, toothless snout and large openings for the nostrils.

Euryapsids have a single hole at the back of the skull called the supratemporal fenestra, which is located toward the top of the head.

[2][1] Another unusual feature of Teraterpeton is the large size of its narial fenestra, a hole in the skull that serves as the opening for the nostril.

This hole is positioned directly in front of the eyes and extends to the level of the toothless portion of the snout.

In fact, Hans-Dieter Sues, the original describer of Teraterpeton, first considered the hole to be an antorbital fenestra before revising his hypothesis.

[2] The preacetabular process (i.e. the front blade of the ilium bone of the hip) was large, thin and had a convex upper edge.

However, the modified and expanded ilium suggests that Teraterpeton's hindlimb musculature (as well as that of rhynchosaurs) was well-adapted for protracting and retracting during more erect forms of locomotion.

The deposit from which it was found is part of the late Carnian Wolfville Formation, comprising a section of the larger Newark Supergroup that stretches across Canada and the eastern United States.

The Wolfville Formation contains a diverse assemblage of Triassic tetrapods that includes temnospondyl amphibians, procolophonid reptiles, and traversodont cynodonts.

Below is a cladogram modified from the 2003 analysis:[2] Petrolacosaurus Youngina Lepidosauromorpha Choristodera Protorosauria Teraterpeton Trilophosaurus Rhynchosauria Prolacerta Archosauriformes