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Dietary and body-mass reconstruction of the Miocene neotropical bat Notonycteris magdalenensis (Phyllostomidae) from La Venta, Colombia

Published online by Cambridge University Press:  12 July 2021

Camilo López-Aguirre Open the ORCID record for Camilo López-Aguirre [Opens in a new window] ,
Nicholas J. Czaplewski ,
Andrés Link ,
Masanaru Takai  and
Suzanne J. Hand
Camilo López-Aguirre*
Affiliation:
Earth and Sustainability Science Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney 2052, Australia. E-mail: s.hand@unsw.edu.au.
Nicholas J. Czaplewski
Affiliation:
Section of Vertebrate Paleontology, Oklahoma Museum of Natural History, Norman, Oklahoma 73072, U.S.A. E-mail: nczaplewski@ou.edu
Andrés Link
Affiliation:
Departamento de Ciencias Biológicas, Universidad de los Andes, 111711 Bogotá DC, Colombia. E-mail: a.link74@uniandes.edu.co
Masanaru Takai
Affiliation:
Primate Research Institute, Kyoto University, 606-8585 Inuyama, Japan. E-mail: takai.masanaru.2s@kyoto-u.ac.jp
Suzanne J. Hand
Affiliation:
Earth and Sustainability Science Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney 2052, Australia. E-mail: s.hand@unsw.edu.au.
*
*Corresponding author.
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Abstract

With 14 species recorded, the Miocene La Venta bat fauna is the most diverse bat paleocommunity in South America. It includes the oldest plant-visiting bat in the New World and some of the earliest representatives of the extant families Phyllostomidae, Thyropteridae, and Noctilionidae. La Venta's Notonycteris magdalenensis is an extinct member of the subfamily Phyllostominae, a group of modern Neotropical animalivorous bats, and is commonly included in studies of the evolution of Neotropical bats, but aspects of its biology remain unclear. In this study, we used multivariate dental topography analysis (DTA) to reconstruct the diet of N. magdalenensis by quantitatively comparing measures of molar complexity with those of 25 modern noctilionoid species representing all major dietary habits in bats. We found clear differences in molar complexity between dietary guilds, indicating that DTA is potentially an informative tool to study bat ecomorphology. Our results suggest N. magdalenensis was probably an omnivore or insectivore, rather than a carnivore like its modern relatives Chrotopterus auritus and Vampyrum spectrum. Also, we reconstructed the body mass of N. magdalenensis to be ~95 g, larger than most insectivorous bats, but smaller than the largest carnivorous bat (V. spectrum). Our results confirm that N. magdalenensis was not a specialized carnivore. It remains to be demonstrated that the specialized carnivory ecological niche was occupied by the same lineage of phyllostomines from at least the middle Miocene. Combining our diet and body-mass reconstructions, we suggest that N. magdalenensis exhibits morphological pre-adaptations crucial for the evolution of specialized carnivory.

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Paleobiology , Volume 48 , Issue 1 , February 2022 , pp. 137 - 153
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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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Footnotes

†

Present address: Department of Anthropology, University of Toronto Scarborough, Toronto M1C 1A4, Canada. E-mail: c.lopezaguirre@utoronto.ca

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