README_file.txt This file explains the contents of the dataset. Microsatellite_data_for_Gekko_hokouensis_and_G._yakuensis.csv This file is in STRUCTURE format and contains the raw data of allele lengths collected from 330 individuals using microsatellite genotyping. The first line lists the names of 16 microsatellite loci. The first column lists sample IDs, and the second column lists the names of sampling sites. Two alleles for each sample are listed in two consecutive columns in the subsequent columns. Missing data is represented with -9. These data include genotypic data for 20 pure G. hokouensis and 20 pure G. yakuensis used in Okamoto et al. (2020).