Romer and Price suggest that _Haptodus_, although too late in time to be an actual ancestor, shows "all the common features of the _Dimetrodon_ group on the one hand and the therapsids on the other." [Please select]
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The relationships described above suggest that _Thrinaxodon_ and the therapsids having similar morphology in the posterior region of the skull possessed a temporal adductor mass that was split into major medial and lateral components (Fig.) [Please select]
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