Genus: Hyphalosaurus GAO, TANG & WANG, 1999
Etymology: Greek, hyphalos, “submerged, underwater”, and Greek, sauros, “lizard”; Underwater lizard.

Species: lingyuanensis GAO, TANG & WANG, 1999
Etymology: In reference to Lingyuan

Referred material:

GAO & KSEPKA, 2008

Locality: Fanzhangzi, Dawangzhangzi (Daxinfanzi) bed, Lingyuan, Liaoning Province, China.

Horizon: Horizon II, Yixian Formation, Jehol Group.

Biostratigraphy: Psittacosaurus fauna, Liaoxiornis Avifauna.

Age: Lower Hautervian Stage, Uppermost Neocomian Subepoch, Lower Early Cretaceous Epoch, Early Cretaceous.

Material:

PKUP V1052: Skull and skeleton.
Note: Has integument along the neck.