Beishanodon youngi, Gao & Fox & Zhou & Li, 2010

Gao, Ke-Qin, Fox, Richard C., Zhou, Chang-Fu & Li, Da-Qing, 2010, A New Nonmammalian Eucynodont (Synapsida: Therapsida) from the Triassic of Northern Gansu Province, China, and its Biostratigraphic and Biogeographic Implications, American Museum Novitates 3685, pp. 1-28 : 7

Beishanodon youngi , new species

HOLOTYPE: PKUP V3007 , incomplete skull with well-preserved snout and left temporal region, but lacking the right zygomatic arch and much of the occiput; only known specimen.

ETYMOLOGY: The specific epithet is in honor of the late Chinese paleontologist C.C. Young, who named and described the first cynodont known from China.

TYPE LOCALITY AND HORIZON: Beishan locality, Quarry-3, in Beishan Hills (41 ° 56 9 739 0 N/ 96 ° 32 9 023 0 E), northern Gansu Province, China; Lower Triassic dark shales of the Hongyanjing Formation (see above discussion) .

DIAGNOSIS: An Early Triassic sinognathine trirachodontid differing from the closely related Sinognathus gracilis by the following derived characters: triangular lateral process of frontal closely approaching but not entering dorsal rim of orbit; jugal/postorbital suture located at midlength of postorbital bar; short intertemporal crest, about one-half length of enlarged temporal fenestra; posterior border of osseous secondary palate straight; incisor roots buccolingually expanded; upper canine obliquely positioned lateral to paracanine fossa; upper postcanine teeth eight in number, and less expanded laterally; transverse crest in upper postcanines located posteriorly; maxillary tooth row terminating at level close to anterior border of orbit; smooth curvature from snout to zygomatic arch; major palatine foramen penetrating palatine at midlength of the element.