Convergent Evolution in the Euarchontoglires

Authors

Philip J.R. Morris, University of HullFollow
Samuel N.F. Cobb, University of York
Philip G. Cox, University of York

Document Type

Article

Publication Date

8-2018

Keywords

aye-aye, convergent evolution, morphology, rodents, mandible, cranium

Digital Object Identifier (DOI)

https://doi.org/10.1098/rsbl.2018.0366

Abstract

Convergence—the independent evolution of similar phenotypes in distantly related clades—is a widespread and much-studied phenomenon. An often-cited, but hitherto untested, case of morphological convergence is that between the aye-aye and squirrels. The aye-aye (Daubentonia madagascariensis) is a highly unusual lemuriform primate that has evolved a dentition similar to that of rodents: it possesses large, ever-growing incisors which it uses to strip the bark from trees in order to feed on wood-boring beetle larvae. Indeed, such is the similarity that some of the earliest classifications of the aye-aye placed it in the squirrel genus Sciurus. Here, we aimed to test the degree of convergence between the skulls and lower jaws of squirrels and the aye-aye. Three-dimensional landmarks were recorded from the crania and mandibles of 46 taxa representing the majority of families in the Euarchontoglires. Results were plotted as phylomorphospaces and convergence measures were calculated. The convergence between squirrels and the aye-aye was shown to be statistically significant for both the cranium and mandible, although the mandibles seem to converge more closely in shape. The convergence may indicate strong functional drivers of morphology in these taxa, i.e. the use of the incisors to produce high bite forces during feeding. Overall, we have shown that this classic case of convergence stands up to quantitative analysis.

Rights Information

This work is licensed under a Creative Commons Attribution 4.0 License.

Was this content written or created while at USF?

No

Citation / Publisher Attribution

Biology Letters, v. 14, issue 8, art. 20180366

Scholar Commons Citation

Morris, Philip J.R.; Cobb, Samuel N.F.; and Cox, Philip G., "Convergent Evolution in the Euarchontoglires" (2018). School of Geosciences Faculty and Staff Publications. 2118.
https://digitalcommons.usf.edu/geo_facpub/2118