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Youngest Rhynchosaur Fossil
December 18 , 2025
16 hrs 0 min
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- The youngest rhynchosaur ever recorded, Macrocephalosaurus mariensis, was described in the British Journal of Systematic Palaeontology.
- The fossil was discovered in southern Brazil.
- The specimen consists of a skull measuring <2.5 cm, making it the smallest rhynchosaur hatchling ever found.
- The fossil shows diagnostic features unique to Macrocephalosaurus mariensis.
- The specimen represents the 1st perinate record of the Hyperodapedontinae clade and one of the oldest archosauromorph hatchlings found in continental deposits.
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