Hydrotherosaurus

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Hydrotherosaurus Temporal range: Maastrichtian, ~72.1–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Restoration
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Superorder:	†Sauropterygia
Order:	†Plesiosauria
Family:	†Elasmosauridae
Genus:	†Hydrotherosaurus Welles, 1943
Species:	†H. alexandrae
Binomial name
†Hydrotherosaurus alexandrae Welles, 1943

Hydrotherosaurus (meaning "fisherman lizard") is an extinct genus of elasmosaurid plesiosaur from the Upper Cretaceous (Maastrichtian stage) Moreno Formation of Fresno County, California, USA. The only known species, H. alexandrae, was named for Annie Montague Alexander in 1943 by Samuel Paul Welles.