Name: Fresnosaurus ‭(‬Fresno lizard‭)‬.
Phonetic: Frez-noe-sore-us.
Named By: Samuel Paul Welles‭ ‬-‭ ‬1943.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Sauropterygia,‭ ‬Plesiosauria,‭ ‬Elasmosauridae.
Species: F.‭ ‬drescheri‭ (‬type‭)‬.
Diet: Piscivore.
Size: Estimate around‭ ‬10‭ ‬meters long for the holotype,‭ ‬but possibly up to‭ ‬12‭ ‬meters when fully grown.
Known locations: USA‭ ‬-‭ ‬California‭ ‬-‭ ‬Moreno Formation.
Time period: Maastrichtian of the Cretaceous.
Fossil representation: Partial skeleton of a juvenile/subadult.

       Fresnosaurus was a late Cretaceous era elasmosaurid plesiosaur that seems to have the signature feature of this group of a very long neck proportionately greater than in earlier and more primitive plesiosaur forms.‭ ‬Like with these other genera,‭ ‬Fresnosaurus was probably a specialist hunter of fish and soft bodied cephalopods like squid.
       Fresnosaurus is not the only plesiosaur from the Moreno Formation with others including Morenosaurus,‭ ‬Aphrosaurus and Hydrotherosaurus.‭ ‬Additionally not only have all of these plesiosaurs come from the Moreno Formation,‭ ‬but they were all described by Samuel Paul Welles and all in‭ ‬1943.‭ ‬Other marine reptiles to be discovered in the Moreno Formation include the mosasaurs Plotosaurus and Plesiotylosaurus,‭ ‬as well as the remains of marine turtles.
       The name Fresnosaurus is a reference to Fresno County in California,‭ ‬while the type species name F.‭ ‬drescheri is in honour of Arthur Drescher.

Further reading
- Elasmosaurid plesiosaurs with description of new material from California and Colorado. Memoirs of the University of California 13:125-254. - S. P. Welles - 1943.


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