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Li, Quanguo; Gao, Ke-Qin; Meng, Qingjin; Clarke, Julia A.; Shawkey, Matthew D.; D'Alba, Liliana; Pei, Rui; Ellison, Mick; Norell, Mark A.; Vinther, Jakob
Science (American Association for the Advancement of Science), 03/2012, Volume: 335, Issue: 6073Journal Article
Indescent feather colors involved in displays of many extant birds are produced by nanoscale arrays of melanin-containing organelles (melanosomes). Data relevant to the evolution of these colors and the properties of melanosomes involved in their generation have been limited. A data set sampling variables of extant avian melanosomes reveals that those forming most iridescent arrays are distinctly narrow. Quantitative comparison of these data with melanosome imprints densely sampled from a previously unknown specimen of the Early Cretaceous feathered Microraptor predicts that its plumage was predominantly iridescent. The capacity for simple iridescent arrays is thus minimally inferred in pa ravi a n dinosaurs. This finding and estimation of Microraptor feathering consistent with an ornamental function for the tail suggest a centrality for signaling in early evolution of plumage and feather color.
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