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Why Owl Monkeys Are Pitheciids: Morphology, Adaptations, and the Evolutionary History of the Aotus Lineage

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Abstract

Phylogeny reconstruction is an estimation of genealogical history, not an exact rendering of it, and no method of phylogeny reconstruction is infallible. The cladistic relationships of the owl monkey, Aotus, are the most hotly contested node of New World monkey interrelationships. The alternative hypotheses can be described taxonomically: Aotus is monophyletically related to either cebids or pitheciids. As predictive propositions, each notion should be evaluated by its explanatory power. The cebid hypothesis predicts that Aotus broadly shares adaptations in morphology, behavior, and ecology with cebines and/or callitrichines, while the pitheciid hypothesis predicts extensive overlap with Callicebus and/or pitheciins. We find no support for the cebid hypothesis and commanding support for the pitheciid hypothesis in the form of integrated morphological and behavioral complexes that are likely to be homologously derived. More attention should be directed toward understanding why the morphology and molecules do not align, from both biological and methodological perspectives.

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Acknowledgments

We thank our colleague Eduardo Fernandez-Duque for the opportunity to contribute to this volume and his encouragement, and the many institutions, and museum curators and support staff that have facilitated our work over the years. Thanks to the Digimorph project and Timothy Rowe for access to three-dimensional imagery of primate crania. Stephen Nash graciously allowed us to use his beautiful illustrations. Thanks to Marilyn Norconk for her expert advice and most helpful discussions of pitheciid biology. Eduardo Fernandez-Duque, Andrea-Spence Aizenberg, and several anonymous reviewers provided much helpful support, advice, and commentary that significantly improved the manuscript, for which we are genuinely grateful.

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© 2023 Eduardo Fernandez-Duque

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Rosenberger, A.L., Tejedor, M.F. (2023). Why Owl Monkeys Are Pitheciids: Morphology, Adaptations, and the Evolutionary History of the Aotus Lineage. In: Fernandez-Duque, E. (eds) Owl Monkeys. Developments in Primatology: Progress and Prospects. Springer, Cham. https://doi.org/10.1007/978-3-031-13555-2_4

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