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Evolution of dinosaur epidermal structures
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
2015 (English)In: Biology Letters, ISSN 1744-9561, E-ISSN 1744-957X, Vol. 11, no 6, 20150229Article in journal (Refereed) Published
Abstract [en]

Spectacularly preserved non-avian dinosaurs with integumentary filaments/feathers have revolutionized dinosaur studies and fostered the suggestion that the dinosaur common ancestor possessed complex integumentary structures homologous to feathers. This hypothesis has major implications for interpreting dinosaur biology, but has not been tested rigorously. Using a comprehensive database of dinosaur skin traces, we apply maximum-likelihood methods to reconstruct the phylogenetic distribution of epidermal structures and interpret their evolutionary history. Most of these analyses find no compelling evidence for the appearance of protofeathers in the dinosaur common ancestor and scales are usually recovered as the plesiomorphic state, but results are sensitive to the outgroup condition in pterosaurs. Rare occurrences of ornithischian filamentous integument might represent independent acquisitions of novel epidermal structures that are not homologous with theropod feathers.

Place, publisher, year, edition, pages
2015. Vol. 11, no 6, 20150229
Keyword [en]
Dinosauria, integument, scales, feathers, phylogeny
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-260146DOI: 10.1098/rsbl.2015.0229ISI: 000357685300013OAI: oai:DiVA.org:uu-260146DiVA: diva2:846663
Available from: 2015-08-17 Created: 2015-08-17 Last updated: 2017-12-04Bibliographically approved

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Campione, Nicolas E.

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