Pigmento original encontrado em penas fossilizadas de dinossauro

terça-feira, setembro 01, 2015

Molecular composition and ultrastructure of Jurassic paravian feathers

Johan Lindgren, Peter Sjövall, Ryan M. Carney, Aude Cincotta, Per Uvdal, Steven W. Hutcheson, Ola Gustafsson, Ulysse Lefèvre, François Escuillié, Jimmy Heimdal, Anders Engdahl, Johan A. Gren, Benjamin P. Kear, Kazumasa Wakamatsu, Johan Yans & Pascal Godefroit

Scientific Reports 5, Article number: 13520 (2015)

10 April 2015

29 July 2015

Published online:
27 August 2015


Feathers are amongst the most complex epidermal structures known, and they have a well-documented evolutionary trajectory across non-avian dinosaurs and basal birds. Moreover, melanosome-like microbodies preserved in association with fossil plumage have been used to reconstruct original colour, behaviour and physiology. However, these putative ancient melanosomes might alternatively represent microorganismal residues, a conflicting interpretation compounded by a lack of unambiguous chemical data. We therefore used sensitive molecular imaging, supported by multiple independent analytical tests, to demonstrate that the filamentous epidermal appendages in a new specimen of the Jurassic paravian Anchiornis comprise remnant eumelanosomes and fibril-like microstructures, preserved as endogenous eumelanin and authigenic calcium phosphate. These results provide novel insights into the early evolution of feathers at the sub-cellular level, and unequivocally determine that melanosomes can be preserved in fossil feathers.

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Uma pergunta causticante:
Pode isso, Arnaldo?

A regra é clara - pigmentos não podem durar todos esses milhões de anos.

Ora se o pigmento em penas fossilizadas não podem durar 150 milhões de anos, quer dizer então que a estória da evolução dos dinossauros a partir de aves está errada? Pano rápido!