Genetic distances amongst individual PCGs. Each boxplot represents the P-distance for 13 individual genes in eleven species in Curculionidae. The box plot presents the minimum and maximum values at the ends of the whiskers, the 25^th and 75^th percentiles at the ends of a box, the median as a horizontal line in the box at the 50^th percentile value, hollow square represent the average and solid diamond as outliers.