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Soft-tissue evidence for homeothermy and crypsis in a Jurassic ichthyosaur
Lund Univ, Dept Geol, Lund, Sweden.
RISE Res Inst Sweden Chem & Mat, Boras, Sweden.
Univ Gottingen, Geosci Ctr, Geobiol, Gottingen, Germany.
North Carolina State Univ, Dept Biol Sci, Raleigh, NC 27695 USA.
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2018 (English)In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 564, no 7736, p. 359-365Article in journal (Refereed) Published
Abstract [en]

Ichthyosaurs are extinct marine reptiles that display a notable external similarity to modern toothed whales. Here we show that this resemblance is more than skin deep. We apply a multidisciplinary experimental approach to characterize the cellular and molecular composition of integumental tissues in an exceptionally preserved specimen of the Early Jurassic ichthyosaur Stenopterygius. Our analyses recovered still-flexible remnants of the original scaleless skin, which comprises morphologically distinct epidermal and dermal layers. These are underlain by insulating blubber that would have augmented streamlining, buoyancy and homeothermy. Additionally, we identify endogenous proteinaceous and lipid constituents, together with keratinocytes and branched melanophores that contain eumelanin pigment. Distributional variation of melanophores across the body suggests countershading, possibly enhanced by physiological adjustments of colour to enable photoprotection, concealment and/or thermoregulation. Convergence of ichthyosaurs with extant marine amniotes thus extends to the ultrastructural and molecular levels, reflecting the omnipresent constraints of their shared adaptation to pelagic life.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 564, no 7736, p. 359-365
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Evolutionary Biology
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URN: urn:nbn:se:uu:diva-372886DOI: 10.1038/s41586-018-0775-xISI: 000453834900050PubMedID: 30518862OAI: oai:DiVA.org:uu-372886DiVA, id: diva2:1277091
Funder
Swedish Research Council, 642-2014-3773Available from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-01-09Bibliographically approved

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Kear, Benjamin P.Ahlberg, Per

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