Evolutionary relationships in Levantina. Numbers at nodes are statistical support for the ML and Bayesian searches (first and second value above branches). Numbers below branches are age estimates in millions of years with the 95% highest posterior density (HPD) credibility interval in parentheses. Age estimates in bold are discussed in details in the text. Haplotype numbering is as in Table 1. The distribution of each haplotype and the relative shell shape is summarized in the column to the right of the haplotype identifiers (K = Karpathos Is.; R = Rhodes Is.; S = Symi Is.; N = Nimos Is.; CT = Continental Turkey; IS = Israel). Pictures illustrate how shell variability (closed or open umbilicus; squares and circles, respectively) is distributed in Levantina and Assyriella.