Tetrapod Fossil Discovery: Fins to Limbs

Fossil Discovery Picture: Fins to Limbs (National Geographic News)
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The humerus of a 365-million-year-old tetrapod (a four-limbed, backboned animal), found in Pennsylvania, shows that the animal could support the front end of its body in a low, wide stance, according to scientists. The scientists say that this posture reflects an intermediate stage in the evolution of limbs from fish fins.

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Image courtesy Kalliopi Monoyios/Science
 
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