Scatter plot of RW1 and RW2 for the pronotum (A) and representations of extreme shape along each axis (B). Coordinates of each shape on the plot are presented in parentheses. Triangle- (△), circle- (○), square- (□), and diamond- (◇) marks denote N. quinquelobata sp. n., N. yatsugatakensis sp. n., N. chichibuensis, and N. saeviens, respectively. Black and white marks denote male and female, respectively. Broken lines represent connections along the margin of each species.