Supplementary material from "Differential influences of allometry, phylogeny and environment on the rostral shape diversity of extinct South American notoungulates"
Posted on 2018-01-19 - 12:34
Understanding the mechanisms responsible for phenotypic diversification, and the associated underlying constraints and ecological factors represents a central issue in evolutionary biology. Mammals present a wide variety of sizes and shapes, and are characterized by a high number of morphological convergences that are hypothesized to reflect similar environmental pressures. Extinct South American notoungulates evolved in isolation from northern mammalian faunas in highly disparate environments. They present a wide array of skeletal phenotypes and convergences, such as ever-growing dentition. Here, we focused on the origins of the rostral diversity of notoungulates by quantifying the shape of 26 genera using three-dimensional geometric morphometric analysis. We tested the influence of allometry and phylogeny on rostral shape and evaluated rates of evolutionary change in the different clades. We found strong allometric and phylogenetic signals concerning the rostral shape of notoungulates. Despite convergent forms, we observed a diffuse diversification of rostral shape, with no significant evidence of influence by large-scaled environmental variation. This contrasts with the increase in dental crown height that occurred in four late-diverging families in response to similar environmental pressures. These results illustrate the importance of considering both biological components and evolutionary rates to better understand some aspects of phenotypic diversity.
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Gomes Rodrigues, Helder; Cornette, Raphaël; Clavel, Julien; Cassini, Guillermo; Bhullar, Bhart-Anjan S.; Fernández-Monescillo, Marcos; et al. (2018). Supplementary material from "Differential influences of allometry, phylogeny and environment on the rostral shape diversity of extinct South American notoungulates". The Royal Society. Collection. https://doi.org/10.6084/m9.figshare.c.3980883.v1
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AUTHORS (9)
HG
Helder Gomes Rodrigues
RC
Raphaël Cornette
JC
Julien Clavel
GC
Guillermo Cassini
BB
Bhart-Anjan S. Bhullar
MF
Marcos Fernández-Monescillo
KM
Karen Moreno
AH
Anthony Herrel
GB
Guillaume Billet