Bony cranial ornamentation linked to rapid evolution of gigantic theropod dinosaurs.

Abstract:

:Exaggerated cranial structures such as crests and horns, hereafter referred to collectively as ornaments, are pervasive across animal species. These structures perform vital roles in visual communication and physical interactions within and between species. Yet the origin and influence of ornamentation on speciation and ecology across macroevolutionary time scales remains poorly understood for virtually all animals. Here, we explore correlative evolution of osseous cranial ornaments with large body size in theropod dinosaurs using a phylogenetic comparative framework. We find that body size evolved directionally toward phyletic giantism an order of magnitude faster in theropod species possessing ornaments compared with unadorned lineages. In addition, we find a body mass threshold below which bony cranial ornaments do not originate. Maniraptoriform dinosaurs generally lack osseous cranial ornaments despite repeatedly crossing this body size threshold. Our study provides novel, quantitative support for a shift in selective pressures on socio-sexual display mechanisms in theropods coincident with the evolution of pennaceous feathers.

journal_name

Nat Commun

journal_title

Nature communications

authors

Gates TA,Organ C,Zanno LE

doi

10.1038/ncomms12931

subject

Has Abstract

pub_date

2016-09-27 00:00:00

pages

12931

issn

2041-1723

pii

ncomms12931

journal_volume

7

pub_type

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