Comparison test of the regression lines of measurements of the common and yellow morphotypes of P. cristiceps.

The variable emphasized corresponds to the one with a significant difference between the inclinations of the regression lines of the morphotypes, in critical values of the tα(2),DF distribution: t0,05(2),75 = 1.92. SSc: sum of the squares of the common morphotype, Ssa: sum of the squares of the yellow morphotype, Sb1–b2: standard error, bc: regression coefficient of the common specimens, and ba: regression coefficient of the yellow specimens.