Subscribe to Journal
Get full journal access for 1 year
only $3.90 per issue
All prices are NET prices.
VAT will be added later in the checkout.
Rent or Buy article
Get time limited or full article access on ReadCube.
All prices are NET prices.
Shawkey, M. D. & D’Alba, L. Egg pigmentation probably has an Archosaur origin. Nature https://doi.org/10.1038/s41586-019-1282-4 (2019).
Wiemann, J., Yang, T.-R. & Norell, M. A. Dinosaur egg colour had a single evolutionary origin. Nature 563, 555–558 (2018).
Kennedy, G. Y. & Vevers, H. G. A survey of avian eggshell pigments. Comp. Biochem. Physiol. B 55, 117–123 (1976).
Gosler, A. G., Higham, J. P. & Reynolds, S. J. Why are birds’ eggs speckled? Ecol. Lett. 8, 1105–1113 (2005).
Wiemann, J. et al. Dinosaur origin of egg color: oviraptors laid blue-green eggs. PeerJ 5, e3706 (2017).
Salzer, R. & Siesler, H. W. (eds). Infrared and Raman Spectroscopic Imaging (John Wiley & Sons, 2014).
Thomas, D. B. et al. Analysing avian eggshell pigments with Raman spectroscopy. J. Exp. Biol. 218, 2670–2674 (2015).
Wiemann, J. et al. Fossilization transforms vertebrate hard tissue proteins into N-heterocyclic polymers. Nat. Commun. 9, 4741 (2018).
Mikšík, I., Paradis, S., Eckhardt, A. & Sedmera, D. Analysis of Siamese Crocodile (Crocodylus siamensis) Eggshell Proteome. Protein J. 37, 21–37 (2018).
O’Reilly, J. E. et al. Bayesian methods outperform parsimony but at the expense of precision in the estimation of phylogeny from discrete morphological data. Biol. Lett. 12, 20160081 (2016).
We thank D. E. G. Briggs for assistance with the manuscript, and M. Fabbri and J. Gauthier for suggestions.
The authors declare no competing interests.
Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Extended data figures and tables
a, The outer eggshell surface (n = 1), which contains the highest pigment concentrations in eumaniraptorans is uncoloured/white. b, c, The inner eggshell surface (n = 2) shows a reddish tint (b), which reflects chorioallantoic tissues and vascularity (c) protruding into the innermost layers of the eggshell. The inner eggshell surface in b is manually cleaned of adjacent chorioallantoic tissue, whereas the inner eggshell surface in c is left untreated. Chorioallantoic tissues (c) are commonly vascularized, and therefore saturated in blood-derived haem, which represents, when dechelated, protoporphyrin. In this case, traces of protoporphyrin recovered from Crocodylus siamensis eggshell would not be homologous with eumaniraptoran eggshell protoporphyrin.
About this article
Cite this article
Wiemann, J., Yang, T. & Norell, M.A. Reply to: Egg pigmentation probably has an Archosaurian origin. Nature 570, E46–E50 (2019). https://doi.org/10.1038/s41586-019-1283-3