Fig. 6
Variation of whorl sections by diameter versus whorl height/whorl width in S. spirula from the Atlantic, Indian and Pacific Oceans. a Bivariate plot showing size differences of distinct populations. b Mean values and standard deviations are given for whorl sections of S. spirula from 11 geographic areas. Sample site numbers given in brackets correspond to site numbers of Fig. 1. The indicated coefficient of determination (R 2) is valid for the combined linear regression of all specimens measured