Data from: Testing a developmental model in the fossil record: molar proportions in South American ungulates

Laura A. B. Wilson, Richard H. Madden, Richard F. Kay & Marcelo R. Sánchez-Villagra
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:...
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