Variability (mean, median, and 5th and 95th percentiles) in the skeletal traits of Millepora . The top graph shows variability in gastropore diameter, and the bottom graph shows variability in dactylopore diameters. The solid line is the median, and the dashed line is the mean. The white boxes represent M. complanata (Mc), boxes with vertical lines are M. alcicornis branched (Mab), and boxes with diagonal lines is M. alcicornis encrusted (Mae). Letters above the boxes are values of Tukey’s test (p < 0.05 for gastropore diameter, p < 0.001 for dactylopore diameter); significant differences among morphotypes are denoted by different letters.