Principal Component Analysis showing the morphospace of the contemporary whitefish species C. alpinus, C. brienzii, C. albellus and C. fatioi from Lake Brienz (A–D) A, B shape PCA of the first vs. the second or third PC-axes explain together 53–60.7% of the variation in shape and are based on all 48 measured linear morphological characters (Table 1), with a dataset containing specimens once smaller (A, B) and once larger (C, D) than 163.5 mm standard length (SL) to avoid allometry issues. The proportion of variance explained by each shape PC is given in brackets and the PC-loadings and amount of shape variation explained by size in Suppl. material 1: Table S3 (< 163.5 mm) and Suppl. material 1: Table S4 (> 163.5 mm).