First of all, the adductors or occlusors consist of two muscles, which, bifurcating near the centre of the shell cavity, produce a large quadruple impression on the internal surface of the small valve (fig. [Please select]
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The lateral push exerted against the cheek by the expansion of the mandibular adductors during contraction. [Please select]
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Changes in pattern that may have modified the origin of the adductors in _Captorhinus_ were correlated with the increase in length of the parietals and the reduction of the supratemporals. [Please select]
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The adductors of the jaw of _Dimetrodon_ were probably little changed from those of the Haptodontinae and represent a primitive condition within the suborder. [Please select]
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