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Multituberculate mammals thrived during the Mesozoic, but their diversity declined from the mid-late Paleocene onwards, with last occurrences known from the late Eocene.
The radiation of superficially similar eutherian rodents has been linked to multituberculate extinction through competitive exclusion.
However, characteristics providing rodents with a supposed competitive advantage are currently unknown and comparative functional tests between the two groups are lacking. Here, a multifaceted approach to craniomandibular biomechanics was taken to test the hypothesis that superior skull function made rodents more effective competitors.
Digital models of the skulls of four extant rodents and the Upper Cretaceous multituberculate Kryptobaatar were constructed and used i in finite element analysis to study feeding-induced stresses, ii to calculate metrics of bite force production, and iii to determine mechanical resistances to bending and torsional forces. Results suggest that most rodents experienced higher craniomandibular stresses and some had lower resistances to bending and torsion than the multituberculate, apparently refuting the competitive exclusion hypothesis.