Fig. 4

a Mitochondrial (COI) haplotypes network (90 % parsimony connection limit) of C. andreae. a1 C. andreae’s haplotypes from eastern Atlantic and western Mediterranean (clade C _A in the phylogenetic tree; Fig. 3). a2 C. andreae’s haplotypes from Turkey and Charleston (corresponding to clade C _B in the phylogenetic tree; Fig. 3). Circle sizes are proportional to haplotype frequency, and each circle is colour coded according to the haplotype’s presence in sampling locations (see Figs. 2, 4b). Non-observed haplotypes are represented by small white circles. Each line connecting haplotypes represents a single mutational change, as well as the number on the box. b Geographical distribution of the 17 COI haplotypes of C. andreae in the Mediterranean Sea and the Atlantic Ocean. Each site is represented by a pie chart showing population composition and relative haplotypes frequency. Site codes correspond to Table 1, numbers in parentheses indicate sample size (colour figure online)