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.

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

Caudal vertebrae from a referred specimen had very long transverse processes (column-like rib facets).

[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