Delorhynchus

Delorhynchus Temporal range: Early Permian, Kungurian PreЄ Є O S D C P T J K Pg N
Skull of D. cifellii
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	†Parareptilia
Order:	†Procolophonomorpha
Superfamily:	†Lanthanosuchoidea
Genus:	†Delorhynchus Fox, 1962
Type species
†Delorhynchus priscus Fox, 1962
Species
D. cifellii Reisz et al., 2014 D. priscus Fox, 1962 (type)

Delorhynchus is an extinct genus of lanthanosuchoid parareptile known from the late Early Permian (Kungurian age) Garber Formation of Comanche County, Oklahoma, south-central United States. It contains the type species D. priscus as well as a better preserved second species D. cifellii.

The type species D. priscus is known from the holotype KU 11117, a fragmentary left maxilla bearing 4 teeth, and from the fragmentary referred specimens KU 11118 and KU 11119, a right and a left maxillae respectively, each bearing 4 teeth. All known specimens of D. priscus are housed at the University of Kansas Natural History Museum in Lawrence, Kansas. 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 Oklahoma Museum of Natural History. 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. OMNH 73362 represents the complete skull of the large, adult, individual. Other remains referred to D. cifellii include OMNH 73363, a complete right mandibular ramus of an individual equal in size to OMNH 73362, as well as the right maxilla OMNH 73524.

Both species of Delorhynchus are known only from the claystone and conglomerate Oklahoma Museum of Natural History (OMNH) Locality V51, at Dolese Brothers limestone quarry of Richards Spur, Fissure Fills, just west of U.S. Highways 62 & 281, 10.5 miles south of Apache and 6 miles north of Fort Sill, of Comanche County, Oklahoma. The remains of both species were collected from the Garber Formation (also known as the Willington Formation) of Summer Group, Arbuckle limestone, which is probably equivalent to the Arroyo Formation of Texas, dating to the middle Leonardian stage, of the upper Rotliegend epoch, Early Permian, about 275 million years ago.