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Testing a developmental model in the fossil record: Molar proportions in South American ungulates

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Date
2012-03-01
Authors
Wilson, LAB
Madden, RH
Kay, RF
Sánchez-Villagra, MR
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Abstract
A developmental model, based upon murine rodents, has been proposed by Kavanagh et al. (2007) to explain lower molar proportions in mammals. We produce a clade-wide macroevolutionary test of the model using the dental evolutionary trends in a unique radiation of extinct mammals endemic to South America ("Meridiungulata") that comprise a diverse array of molar morphologies. All of the South American ungulate groups examined follow the inhibitory cascade model with the exception of two groups: Interatheriidae (Notoungulata) and Astrapotheria. For most taxa studied, ratios between lower molar areas are greater than 1.0, indicating a weak inhibition by m1 on the subsequent molars in the tooth row, and a trend to greater absolute size of the posterior molars. Comparisons of mean ratios between clades indicate that a significant phylogenetic signal can be detected, particularly between the two groups within Notoungulata Typotheria and Toxodontia. Body mass estimates were found to be significantly correlated with both m3/m1 and m2/m1 ratios, suggesting that the larger body size achieved the weaker inhibition between the lower molars. Molar ratio patterns are examined and discussed in relation to the independent and numerous acquisitions of hypsodonty that are characteristic of dental evolution in "Meridiungulata. © 2012 The Paleontological Society. All rights reserved.
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Journal article
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https://hdl.handle.net/10161/10792
Published Version (Please cite this version)
10.1666/11001.1
Publication Info
Wilson, LAB; Madden, RH; Kay, RF; & Sánchez-Villagra, MR (2012). Testing a developmental model in the fossil record: Molar proportions in South American ungulates. Paleobiology, 38(2). pp. 308-321. 10.1666/11001.1. Retrieved from https://hdl.handle.net/10161/10792.
This is constructed from limited available data and may be imprecise. To cite this article, please review & use the official citation provided by the journal.
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Scholars@Duke

Kay

Richard Frederick Kay

Professor of Evolutionary Anthropology
I have two areas of research:1) the evolution of primates in South America; and 2) the use of primate anatomy to reconstruct the phylogenetic history and adapations of living and extinct primates, especially Anthropoidea. 1) Evolution of primates and mammalian faunal evolution, especially in South America. For the past 30 years, I have been engaged in research in Argentina, Bolivia The Dominican Republic, Peru, and Colombia with three objectives:a) to reconstruct the evol
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