Sampling site, species delimitation, and mitochondrial cytochrome c oxidase subunit I (COI) and nuclear internal transcribed spacer 1 (ITS 1) diversity for the Nassarius mud snails.

The sites coded with “R” were adopted from Zou et al. [22], and accession numbers for sequences derived from these sites were listed in S1 Table of Zou et al. [22]. N = number of individuals sequenced; n = number of haplotypes/alleles; h = haplotypic/allelic diversity; π = nucleotide diversity. For sampling sites, the abbreviations for provinces are: SD = Shandong Prov., ZJ = Zhejiang Prov., GD = Guangdong Prov., HN = Hainan Prov., LN = Liaoning Prov., JS = Jiangsu Prov., FJ = Fujian Prov., GX = Guangxi Zhuang Autonomous Region.