Collection sites of Microcosmus squamiger including geographical regions, population abbreviations (Code), type of habitat (O: outside harbour, I: inside harbour) and number of individuals analysed.

Diversity estimates based on microsatellites are as follows: He - mean expected heterozygosity (Nei's gene diversity), HO - mean observed heterozygosity, Na - mean number of alleles per locus, Np - number of private alleles, AR - mean Allelic Richness, FIS - inbreeding coefficient with significant values in bold, and. h - haplotype diversity in COI (data from [33]).