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Fig. 2 Distribution of interspecific Kimura 2 parameter (K2P) distances for cytochrome c oxidase subunit I (COI) sequences from the 68 fish species, the 59 shellfish species, and the 29 insect species. Vertical lines show the mean pairwise distance at each level. The X- and Y-axes represent K2P distance values and the percentage of individuals, respectively. (A) Interspecific K2P distances. (B) Intraspecific K2P distances.