A. Principal component analysis using karst habitat preference and granite stream habitat preference as the dependent variables for G. catbaensis, G. huuliensis, and G. luii of the luii group and G. lichtenfelderii of the lichtenfelderi group. B. Violin plots overlain with box plots showing the range, frequency, mean (white dot), and 50% quartile (black rectangle) of the size-adjusted morphometric characters. Asterisks denote characters bearing statistically significant mean differences between the karst and granite-stream-adapted species based on student t-tests. Upper photo from Vuu et al. (2008). Lower photo from Hai Ngoc Ngo.