Figure 5b from: Wayland M (2013) Morphological variation in Echinorhynchus truttae Schrank, 1788 and the E. bothniensis Zdzitowiecki & Valtonen, 1987 species complex from freshwater fishes of northern Europe. Biodiversity Data Journal 1: e975. https://doi.org/10.3897/BDJ.1.e975

Figure 5b - Principal component analysis of the proboscis profiles of female Echinorhynchus bothniensis, Echinorhynchus \'bothniensis\', Echinorhynchus leidyi and Echinorhynchus truttae. The first (PC1) and second (PC2) principal components describe 64% and 10% of the variance in the data, respectively. Analysis based on data in Suppl. material 4.
Scatterplot of the loadings for the first two principal components. Key: l and b, length and base measurements respectively, from hooks in the 4.5-79.5% region of the proboscis; L and B, length and base measurements respectively, from hooks in the 80.5-95.5% region of the proboscis.