Name: Sanjuansaurus ‭(‬San Juan lizard‭).
Phonetic: San-whan-sore-us.
Named By: Oscar Alcober‭ & ‬Ricardo Martinez‭ ‬-‭ ‬2010.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Theropoda,‭ ‬Eusaurischia,‭ ‬Herrerasauridae.
Species: S.‭ ‬gordilloi‭ (‬type‭)‬.
Diet: Carnivore.
Size: Estimated‭ ‬3‭ ‬meters long.
Known locations: Argentina,‭ ‬San Juan Province‭ ‬-‭ ‬Ischigualasto Formation.
Time period: Ladinian of the Triassic.
Fossil representation: ‭P‬artial skeleton with a jaw fragment.

       Superficially Sanjuansaurus was probably similar to Herrerasaurus in general appearance,‭ ‬but some skeletal features seem to have been slightly more primitive.‭ ‬Sanjuansaurus lived in the same time and location as its more famous relative Herrerasaurus which would suggest that this form held an important place in their ecosystem.‭ ‬Neither‭ ‬Sanjuansaurus‭ ‬nor Herrerasaurus would have been top predators however as large rauisuchian predators like the seven meter long Saurosuchus dominated the area.‭ ‬Although certainly not as fast as Sanjuansaurus,‭ ‬Saurosuchus had a tough hide with osteoderm armour down its back along with jaws that were larger and much more powerful than Sanjuansaurus.‭

Further reading
- A new herrerasaurid (Dinosauria, Saurischia) from the Upper Triassic Ischigualasto Formation of northwestern Argentina. - Zookeys 63:55-81. - O. A. Alcober & R. N. Martínez - 2010.


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