Results of biometric (a–d) and geometric morphometrics study (e), for the two mitochondiral clades of Tarebia granifera (Lamarck, 1816) found in this study. Boxplots of (a) shell height, (b) shell width, (c) height of the last three whorls and (d) index of height of last three whorls agaianst shell width. Significant differences between groups are indicated by bars above the boxplots (e). Relative variance in shell shape along PC1 and PC2. Colour corresponding planes indicate the spread of each morph in the data set.