Genus: Philydrosaurus GAO & FOX, 2005
Etymology: Greek, philydros, "water" and Greek, sauros, "lizard": Water-loving lizard, referring to the presumed aquatic life style of the animal.

Species: proseilus GAO & FOX, 2005
Etymology: Greek, proseios, "toward the sun," similar in meaning to place name Chaoyang.

Holotype: PKUP V2001

Locality: Shangheshou near the city of Chaoyang, Liaoning Province, China.

Horizon: Chiufotang Formation.

Biostratigraphy:

Age: Early Cretaceous.

Material: Nearly complete skull, and lower jaws in association with partial postcranial skeleton.

Referred material:

GAO, KSEPKA, HOU, DUAN & HU, 2007

Locality: Fossil Quarry at Yuanjiawa village, N41°25'39", E120°09'06", near Dapingfang, approximately 40km southwest to the city of Chaoyang, Liaoning Province, China.

Horizon: Chiufotang Formation.

Biostratigraphy:

Age: Early Cretaceous.

Material:

LPMC 021 (SNU field #043): A disarticulated but closely associated skeleton with well-preserved skull.