Alnashetri cerropoliciensis: The Tiny Dino That Reshaped Dinosaur Evolution

A sub-kilogram Cenomanian predator from Patagonia’s La Buitrera reveals adult, egg-laying biology through medullary bone, proving it wasn’t a baby. This tiny fossil rewrites how alvarosaurians evolved: miniaturization came first, followed by specialized limbs, and it supports vicariance as a driver of their global distribution. A Rosetta stone for dinosaur evolution, it invites us to rethink what “small” meant in the age of giants.

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