DinoDigHydrotherosaurus alexandrae
- Time
- 66–72.2 million years ago
- Period
- Unknown
- Known sites
- 1
Summary
Hydrotherosaurus is an extinct genus of elasmosaurid plesiosaur from the Upper Cretaceous 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.
Source: Wikipedia - Hydrotherosaurus
Known Sites
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