Modularity and heterochrony in the evolution of the ceratopsian dinosaur frill
Prieto-Marquez, Albert (Institut Català de Paleontologia Miquel Crusafont)
Garcia-Porta, Joan (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Joshi, Shantanu H. (University of California, Los Angeles)
Norell, Mark (American Museum of Natural History)
Makovicky, Peter J. (University of Minnesota)

Data:	2020
Resum:	The fossil record provides compelling examples of heterochrony at macroevolutionary scales such as the peramorphic giant antlers of the Irish elk. Heterochrony has also been invoked in the evolution of the distinctive cranial frill of ceratopsian dinosaurs such as Triceratops. Although ceratopsian frills vary in size, shape, and ornamentation, quantitative analyses that would allow for testing hypotheses of heterochrony are lacking. Here, we use geometric morphometrics to examine frill shape variation across ceratopsian diversity and within four species preserving growth series. We then test whether the frill constitutes an evolvable module both across and within species, and compare growth trajectories of taxa with ontogenetic growth series to identify heterochronic processes. Evolution of the ceratopsian frill consisted primarily of progressive expansion of its caudal and caudolateral margins, with morphospace occupation following taxonomic groups. Although taphonomic distortion represents a complicating factor, our data support modularity both across and within species. Peramorphosis played an important role in frill evolution, with acceleration operating early in neoceratopsian evolution followed by progenesis in later diverging cornosaurian ceratopsians. Peramorphic evolution of the ceratopsian frill may have been facilitated by the decoupling of this structure from the jaw musculature, an inference that predicts an expansion of morphospace occupation and higher evolutionary rates among ceratopsids as indeed borne out by our data. However, denser sampling of the meager record of early-diverging taxa is required to test this further.
Ajuts:	Ministerio de Economía y Competitividad FJCI-2014-20380 Ministerio de Economía y Competitividad RYC-2015-17388
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Dinosaur ; Evolution ; Heterochrony ; Modularity ; Morphometrics
Publicat a:	Ecology and evolution, Vol. 10, Issue 13 (July 2020) , p. 6288-6309, ISSN 2045-7758

DOI: 10.1002/ece3.6361
PMID: 32724514

22 p, 2.7 MB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
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