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PALEOZOIC ERA

CARBONIFEROUS PERIOD

318-300 million years ago

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PELYCOSAUR

OPHIACODONT PELYCOSAURS

In ophiacodont pelycosaurs, the frontal bone developed a slope unlike the flat ancestral bone and the occipital region slopes posteriorly. The vertebrae of ophiacodont pelycosaurs possessed enlarged neural spines and transverse processes for muscle attachment.