Fig. 8
Bivariate diagrams of conch parameters of S. spirula from the Maldives with indicated coefficient of determination (R 2). R 2 values are valid for the combined linear regression of both morphotype groups. a Bivariate plot of whorl height (wh) versus diameter (d). b Bivariate plot of whorl width (ww) versus d. c Bivariate plot of wh/ww versus d. Note the dashed line between morphotype 1 (robust specimens, grey circles) and morphotype 2 (delicate specimens, black triangles; see text for explanation)