Reproduction of plots from Mann et al. using the same variables. a) valve length, b) valve width, c) valve width vs. length, d) valve width vs. rectangularity, corresponding to Figures 5, 6, 10 and 14 from Mann et al. . In the box plots in a) and b), the thick horizontal lines represent the medians; the boxes range from the first to the third quartile; and whiskers +/- 1.58 times the interquartile range. Individual values outside these ranges are displayed as circles.