Geometric morphometric analysis on the carapace of mitten crabs from Belgium, Germany and Poland and three native specimens from China and Japan A procrustes shapes of two specimens at the opposite ends of the first principal component axis B scatterplot of the first two axes of the principal component analysis. Each dot is a specimen, with size proportional to carapace width. Colours denote different sampling countries and asterisks individuals with an E. japonica haplotype.