Haplotype network of eight distinct haplotypes and their distribution detected for Halophila ovalis in both Western Pacific and Indian Ocean. Haplotypes are presented by abbreviations in the circles. Abbreviations as in Table 1. Small solid circles are missing haplotypes. Nucleotide position and differences of nucleotide between two haplotypes are presented in each node. The dendrogram was implemented by software TCS version 1.21 .