3D Camouflage in an Ornithischian Dinosaur

Jakob Vinther, Robert Nicholls, Stephan Lautenschlager, Michael Pittman, Tom Kaye, Gerald Mayr, Emily Rayfield, Innes Cuthill

Research output: Contribution to journalArticle (Academic Journal)

40 Citations (Scopus)
430 Downloads (Pure)

Abstract

Countershading was one of the first proposed mechanisms of camouflage. A dark dorsum and light ventrum counteract the gradient created by illumination from above, obliterating cues to 3D shape. Because the optimal countershading varies strongly with light environment pigmentation patterns give clues to an animal’s habitat. Indeed, comparative evidence from ungulates shows that interspecific variation in countershading matches predictions: in open habitats, where direct overhead sunshine dominates, a sharp dark-light color transition high up the body is evident; in closed habitats (e.g., under forest canopy), diffuse illumination dominates and a smoother dorsoventral gradation is found. We can apply this approach to extinct animals in which the preservation of fossil melanin allows reconstruction of coloration. Here we present a study of an exceptionally well-preserved specimen of Psittacosaurus sp. from the Chinese Jehol biota. This Psittacosaurus was countershaded with a light underbelly and tail, whereas the chest was more pigmented. Other patterns resemble disruptive camouflage, whereas the chin and jugal bosses on the face appear dark. We projected the color patterns onto an anatomically accurate life-size model in order to assess their function experimentally. The patterns are compared to the predicted optimal countershading from the measured radiance patterns generated on an identical uniform gray model in direct versus diffuse illumination. These studies suggest that Psittacosaurus sp. inhabited a closed habitat such as a forest with a relatively dense canopy.
Original languageEnglish
Pages (from-to)2456-2462
Number of pages8
JournalCurrent Biology
Volume26
Issue number18
Early online date15 Sep 2016
DOIs
Publication statusPublished - 26 Sep 2016

Keywords

  • defensive coloration
  • countershading
  • paleocolor
  • Jehol biota
  • Yixian Formation
  • paleoenvironment
  • behavioral ecology
  • taphonomy
  • soft-tissue preservation
  • Lagerstätte

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    Vinther, J., Nicholls, R., Lautenschlager, S., Pittman, M., Kaye, T., Mayr, G., Rayfield, E., & Cuthill, I. (2016). 3D Camouflage in an Ornithischian Dinosaur. Current Biology, 26(18), 2456-2462. https://doi.org/10.1016/j.cub.2016.06.065