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Sampling site locations and the main phylogeographic breaks described in previous studies of Cerastoderma glaucum based on COI, STRs, and EPIC markers (Sromek et al., 2016; Tarnowska et al., 2010). Numbers in parentheses indicate proportion of mitochondrial DNA haplogroups (arbitrarily numbered from H1 to H6) found in each sampling site by Tarnowska et al. (2010)
