3.3 cetn-int2 molecular phylogeny
Populations from the Pacific coast and the Sea of Japan coast tended to have different haplotypes, but this tendency was not clear in the populations from Kyushu and Tsugaru Strait (p16, p30, and p31) where the two seas meet (Figures 1 and 3). Samples from parthenogenetic populations p24 and p27 had two cetn -int2 haplotypes; the one haplotype was common in the Pacific coast parthenogenetic populations and the other was common in the Sea of Japan coast sexual populations (Figure 3).