Name: Corosaurus ‭(‬Coro lizard‭)‬.
Phonetic: Co-roe-sore-us.
Named By: Ermine Cowles Case‭ ‬-‭ ‬1936.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Sauropterygia,‭ ‬Pistosauroidea,‭ ‬Corosauridae.
Species: C.‭ ‬alcovensis‭ (‬type‭)‬.
Diet: Piscivore/Carnivore.
Size: Around‭ ‬1‭ ‬meter long.
Known locations: USA,‭ ‬Wyoming‭ ‬-‭ ‬Alcova Limestone Formation.
Time period: Anisian of the Triassic.
Fossil representation: Several individuals.

       Originally described as a nothosaur,‭ ‬Corosaurus is now identified as a pistosaurid,‭ ‬a kind of sauropterygian reptile that is related to but separate to the true nothosaurs.‭ ‬The pistosauroids are established around the type genus pistosaurus,‭ ‬and it may have been these kinds of marine reptiles that were actually ancestral to the plesiosaurs that would begin to appear around the late Triassic and early Jurassic.‭
       Fossils of Corosaurus have been dated to be around‭ ‬245-247‭ ‬million years old,‭ ‬which firmly places them within the early Anisian stage of the mid Triassic.‭ ‬The small size of Corosaurus indicates that members of the genus were probably predators of smaller marine organisms along the lines of fish.

Further reading
-‭ ‬A nothosaur from the Triassic of Wyoming‭ ‬-‭ ‬Ermine Cowles Case‭ ‬-‭ ‬1936.
-‭ ‬Corosaurus alcovensis Case and the phylogenetic interrelationships of Triassic stem-group Sauropterygia‭ ‬-‭ ‬Olivier Rieppel‭ ‬-‭ ‬1998.
-‭ ‬Anatomy and Relationships of Corosaurus alcovensis‭ (‬Diapsida:‭ ‬Sauropterygia‭) ‬and the Triassic Alcova Limestone of Wyoming‭ ‬-‭ ‬Glenn William Storrs‭ ‬-1991.


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