Species: hsui YOUNG, 1944
Etymology: In honor of Mr. T. Y. Hsu of the National Geological Survey of China, who contributed so much to the knowledge of the Triassic stratigraphy and
marine invertebrate fossils of that period in China, and who recently lost his life while working in the field in Kweichow Province, China.

Holotype: CRL (Cenozoic Research Laboratory) No. V. 71

Locality: Huangchiaten, about 1 km north of sliawan, Lufeng, Yunnan Province, China.

Horizon: Dark Red Beds, Lower Lufeng Formation.

Biostratigraphy:

Age: Sinemurian Stage, Middle Lias Epoch, Middle Early Jurassic.

Material: Anterior end of dentary with 1 tooth.

Note: Lost or destroyed during WW II

Platyognathus hsui (modified from Young, 1944).

Neotype: IVPP V8266

Locality: About 10 m west of the intersection of the roads from Zhangjiawa to Dadi and from Dawa Elementary School to Dahuangtian, Yunnan Province, China.

Horizon: Stratum 6 (middle of Dark Red Beds) of Lower Lufeng Formation.

Biostratigraphy:

Age: Sinemurian Stage, Middle Lias Epoch, Middle Early Jurassic.

Material: Rostral portion of snout with tightly oppressed partial mandible.

Referred material:

WANG, CLARK, LI, RUEBENSTHAL & BI, 2025

Locality: Low cliffs near the cornfield near Dadi Village, lufeng County, Yunnan Province, China.

Horizon: Zhangjawa Member, Lower Lufeng Formation.

Biostratigraphy:

Age: Sinemurian Stage, Middle Lias Epoch, Middle Early Jurassic.

Material:

CVEB (Centre for Vertebrate Evolutionary Biology, Yunan University) 21301: A nearly complete skull with articulated mandible, articulated with the anterior 17 vertebrae and associated dorsal osteoderms, other dorsal, vetnral, and appendicular osteoderms, part of teh right scapulocoracoid, the left humerus, the right femur dn proximal tibia and fibula, most of the left tibia and fibula articulated with the tarsus and proximal metatarsals.