Trogonophidae:

Trogonophids can be distinguished from other amphisbaenians by their triangular cross section. In addition they have acrodont teeth as opposed to pleurodont teeth in other amphisbaenians (in acrodont vertebrates teeth are attached to the apex = acron of the dentaries, maxillae, or premaxillae, whereas pleurodont species have their teeth attached to the medial surface of the bone). They lack caudal autonomy which is present in most other amphisbaenians. Snout strongly flattened snout with slightly upturned edges.