Delorhynchus is an extinct genus of lanthanosuchoid parareptile known from the late Early Permian (Artinskian age) Garber Formation of Comanche County, Oklahoma.

The specific name of the type species D. priscus is derived from Greek πρίσκος, meaning "ancient" or "venerable" in reference to the fragmentary nature of the known remains.

[4] Unlike the type species, D. cifellii is known from a well-preserved partial subadult skeleton, an isolated adult skull, and other disarticulated elements, all housed at the OMNH.

The subadult individual preserves both the partial skull and the postcranial remains in articulation, and thus was chosen as the holotype, represented by OMNH 73515.

It was named in reference to the multiple rows of teeth on the lower jaw of the skull, a unique feature which distinguished it from other Delorhynchus species.

This locality, also known as Richards Spur, is found at the Dolese Brothers limestone quarry near Fort Sill in Comanche County, Oklahoma.

[9] Mesosaurus Millerosauria Australothyris smithi Feeserpeton oklahomensis Colobomycter pholeter Delorhynchus cifellii Acleistorhinus pteroticus Lanthanosuchus watsoni Microleter mckinzieorum Belebey chengi Eudibamus cursoris Nycteroleteridae Pareiasauria Abyssomedon williamsi Nyctiphruretus acudens Owenettidae Procolophonidae The Richards Spur locality presents a very rich Early Permian vertebrate paleofauna, including species of chondrichthyes, lepospondyls, seymouriamorphs, basal synapsids, and basal eureptiles.