Additional file 4.
Ultrametric tree obtained with BEAST to find the age of the split between S. mediterranea and S. polychroa. Numbers in nodes represent the posterior probability/bootstrap values obtained in the phylogenetic analyses performed with MrBayes and PHYML (not shown). * indicates the maximum value, and the symbol - indicates values <0.5 or 50%. Purple numbers represent the confidence interval (95%) for the age of the node. Coloured branches indicate the membership of S. mediterranea individuals to one of the geographical groups: W in red, C in blue and S in green.
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Lázaro et al. BMC Evolutionary Biology 2011 11:274 doi:10.1186/1471-2148-11-274