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Consequently, we propose that the positive allometry of male chelicerae may result from sexual selection to mechanically mesh with larger and more fecund females. Evidence for mechanical mesh includes multiple traits ranging from apophyses and grooves to guide teeth on the basal portion of the chelicerae. In contrast, we propose that chelicerae of females are analogous to the female peacock's tail shortened by natural selection limiting the exaggeration of sexually selected traits. Indeed, females had increased foraging efficiency compa