Standardised major axis (SMA) regression model output showing the relationship between log-transformed propodus length/height and carapace length for male and female Kiwa tyleri and Kiwa puravida specimens as performed by the smatr R package.

Models initially compared slope angle between males (M) and females (F) and if non-significant, a comparison with slope elevation (y-axis offset) assuming equal slopes was made. 95% CI = 95% confidence interval, H0 = null hypothesis of test comparing male and female slopes angle/elevation, P = p-value, indicating significance of test with values S2 Table.