Phylogenetic tree reconstructed based on the neighbor-joining (NJ) and Bayesian Inference (BI) methods using COI gene (a), and the haplotype network was constructed based on haplotypes of COI (b). (The numbers on branches indicate the bootstrap values (NJ) and posterior probabilities (BI) being separated by a slash. Haplotype frequencies are related to the size of the circle. Different colors within the nodes of St. eurasius refer to different sampling sites.)