Joaquinrapor Dinosaur: Bone Found in Patagonian Fossil
Okay, hear’s a breakdown of the key facts from the provided text, focusing on the newly discovered dinosaur, Joaquinraptor casali:
What is it?
* A new species of megarraptorid – a group of large, carnivorous dinosaurs known for their huge claws.
* Named Joaquinraptor casali in honor of the son of the lead researcher and a prominent Patagonian paleontologist.
Where and When was it found?
* Southern Chubut, Argentina. Specifically, the Lake Colhué Huapi formation.
* Lived during the Upper Cretaceous period, relatively close too the time of the mass extinction event (around 66 million years ago).
Key Features & Significance:
* Size: Approximately 7 meters long and weighed about a ton.
* Age at Death: Roughly 19 years old.
* “Last Meal” Evidence: A crocodiliform (primitive crocodile) humerus (upper arm bone) was found between its jaws. This suggests the dinosaur preyed on crocodiliforms, a previously undocumented behavior for this group. It could also indicate another type of ecological interaction, but the “last meal” hypothesis is favored.
* Completeness: It’s one of the most complete megarraptorid skeletons discovered to date. It includes a jaw and an articulated arm, providing valuable anatomical information.
* Ecosystem Role: Joaquinraptor was likely a top predator in its ecosystem.
* Time Capsule: The discovery provides insights into the dinosaur’s anatomy, behavior, and eating habits.
In essence,this discovery is critically important as it:
* Adds to our understanding of megarraptorid dinosaurs.
* Provides evidence of the dinosaur’s diet and predatory behavior.
* Offers a glimpse into the ecosystem of Patagonia just before the mass extinction event.