Hyphalosaurus

Hyphalosaurus; Temporal range: Early Cretaceous, 123–120 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
	Fossil specimen, on display at the National Museum of Natural Science
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	†Choristodera
Family:	†Hyphalosauridae
Genus:	†Hyphalosaurus; Gao, Tang & Wang 1999
Type species
	†Hyphalosaurus lingyuanensis; Gao, Tang & Wang, 1999
Species
	†H. lingyuanensis Gao et al., 1999; ; †H. baitaigouensis Ji et al., 2004;
Synonyms
	Sinohydrosaurus Li, Zhang & Li, 1999;

Hyphalosaurus (meaning "submerged lizard") is a genus of freshwater aquatic reptiles, belonging to the extinct order Choristodera. They lived during the early Cretaceous period (late Barremian to early Aptian age), about 123-120 million years ago. The genus contains two species, H. lingyuanensis from the Yixian Formation and H. baitaigouensis from both the Yixian and Jiufotang Formation of Liaoning Province, China.^[1] They are among the best-known animals from the Jehol Biota, with thousands of fossil specimens representing all growth stages in scientific and private collections.

^ Zhang, L.-J.; Ji, S.-A.; Zhang, H.-C. (2024). "Discovery of the choristodere Hyphalosaurus baitaigouensis from the Lower Cretaceous Jiufotang Formation of western Liaoning, China and its paleobiogeographic significance". Journal of Palaeogeography. 13 (3): 547–562. doi:10.1016/j.jop.2024.05.003.

[Jiufotang-1] Zhang, L.-J.; Ji, S.-A.; Zhang, H.-C. (2024). "Discovery of the choristodere Hyphalosaurus baitaigouensis from the Lower Cretaceous Jiufotang Formation of western Liaoning, China and its paleobiogeographic significance". Journal of Palaeogeography. 13 (3): 547–562. doi:10.1016/j.jop.2024.05.003.

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