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- W2014298081 abstract "A new explanation for the origin of the primate suborder Anthropoidea is presented. Functional analyses of the “forward”-facing orbits, postorbital septum and retinal fovea are used to reconstruct the morphological and ecological contexts in which these features are most likely to have evolved. The postorbital septum is argued to have evolved as an adaptation to protect the orbital contents from encroaching fibers of anterior temporalis. This encroachment resulted from increasing convergence and frontation of the orbital margins in a lineage of small-bodied animals with relatively large eyes. Increasing orbital convergence is hypothesized to have resulted from reduction in relative orbit diameter associated with a shift to diurnality at small body size (<1,300 g). Increased frontation (verticality) of the orbital margins is hypothesized to have been due to rostral displacement of the superior orbital margin or increasing basicranial flexion in a lineage of animals with orbits pushed to the midline below the olfactory tract. Either of these changes would have occurred as a result of increases in neocortex size. Increased neocortical volume is hypothesized to have resulted from a shift to group living associated with a shift to diurnality. Diurnal, visual predation among other vertebrates is commonly associated with possession of a retinal fovea and the haplorhine fovea is hypothesized to have evolved in a similar context. All these features are hypothesized to have evolved in association with a shift from nocturnal to diurnal visual predation of insects at small body size and this adaptive shift is argued to be the defining feature of the anthropoid suborder. The omomyid skull is the best structural antecedent of the anthropoid skull; however, if basal primates exhibited moderate degrees of orbital convergence and frontation, orbits that were closely approximated below the olfactory tract and nocturnal habits, they could easily have given rise to the anthropoid stem species. The presence of a retinal fovea and lack of a tapetum lucidum in extant tarsiers implies that they shared a diurnal ancestry with anthropoids. This suggests that the adaptive explanation for anthropoid origins presented here applies to the origins of the haplorhine stem lineage. © 1996 Wiley-Liss, Inc." @default.
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- W2014298081 date "1996-01-01" @default.
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- W2014298081 title "Adaptive explanation for the origins of the anthropoidea (primates)" @default.
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- W2014298081 doi "https://doi.org/10.1002/(sici)1098-2345(1996)40:3<205::aid-ajp1>3.0.co;2-1" @default.
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