A Eighteen sampling localities of the genus the Trichiurus along the Chinese coast and the species composition after our surveys. Refer to Suppl. material 1: Table S1 for the abbreviations of localities. B The maximum-likelihood (ML) tree of these four Trichiurus species along the coast based on the COI gene. The numbers at the nodes are bootstrap values of the ML and NJ (neighbor-joining) analyses. The sampling size (n) indicated in parentheses C The photographs of four Trichiurus species used in the mitogenomes analyses.