Nature Communications 4: Article number: 1621 (2013); Published: 27 March 2013; Updated: 1 October 2013.

The file containing Supplementary Data 1 was inadvertently omitted during production of this article and should have been referred to in the ‘Phylogenetic analysis’ section of the Methods, as follows: ‘The character matrix used herein (Supplementary Data 1) is based on the matrix of Liu et al.11’. Supplementary Data 1 is now available to download from the HTML version of this Erratum.