Fig. 4 in Sexual Dimorphism in Three Species of Heterelmis Sharp (Coleoptera: Elmidae)

Fig. 4. Observed frequency distributions of three body characteristics of male and female Heterelmis vulnerata (n = 61 individuals). a) Total body length (in mm), b) Abdominal length (in mm), c) Fifth ventrite length (in mm). The vertical dashed line in panel c is a proposed fifth ventrite size threshold (0.26 mm) that could be used to determine sex using this feature.