Results of the morphometric analysis of three species of Sphaeriidae from Morocco. A Principal Component Analysis (PCA) with variables that contributed most to the PCA analysis, based on the measured ratios. Length L (maximum distance on the anterior – posterior axis), length of anterior part LA, length of posterior part LP, height H (maximum distance on the dorsal-ventral axis), length of umbo LU, length of the ligament of the left valve LL, length of the hinge LH, height of the hinge of the left valve HH; B Mean outline of semi-landmarks of the three species (species symbols as in A).