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meaning: "Water beast lizard"
Named By: Samuel Paul Welles in 1943
Time Period: Late Cretaceous, 70-66 Ma
Location: USA - California - Moreno Formation
Size: Up to 13 meters long
Diet: Piscivore
Fossil(s): Almost complete individual
Classification: | Chordata | Reptilia | Sauropterygia | Plesiosauria | Elasmosauridae |

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

Read more about Hydrotherosaurus at Wikipedia
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