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Drepanosaurus Seems to be a Triassic, Diapsid 'ant-eater'

Extreme Modification of the Tetrapod Forelimb in a Triassic Diapsid Reptile Authors: Pritchard et al Abstract: The tetrapod forelimb is one of the most versatile structures in vertebrate evolution, having been co-opted for an enormous array of functions. However, the structural relationships between the bones of the forelimb have remained largely unchanged throughout the 375 million year history of Tetrapoda, with a radius and ulna made up of elongate, paralleling shafts contacting a series of shorter carpal bones.
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