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PALEOZOIC ERA

CARBONIFEROUS PERIOD

318-300 million years ago

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PELYCOSAUR

The limbs became longer and the hip became stronger.

Sphenacodonts evolved more gracile limbs which were longer and more slender. The forearm became longer and more slender and longer still in therapsids. In the hip, the ilium was expanded. Sphenacodonts evolved a longer, more slender foot and a hinge ankle joint.