an extinct carnivorous mammallike reptile, of the genus Dimetrodon, dominant in North America during the Permian Period, up to 10 feet (3.1 meters long and usually bearing spinal sails.
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The adductor musculature of the lower jaw in Dimetrodon was divided into lateral and medial groups (Figs. 5, 6).
Thrinaxodon represents an advance beyond Dimetrodon in several respects.
A similar origin suggests itself for the corresponding muscle, the second major adductor mass, in Dimetrodon.
The dentition of Dimetrodon further substantiates the movement of the jaw in a simple up and down direction.
Watson believed that the jaw of Dimetrodon was capable of anteroposterior sliding.