Dorsal view of male and female Callosobruchus maculatus. (a) Male and (b) female. The sex specific coloration of the posterior abdominal plate (pygidium) is shown. The squares are 1 mm. From beanbeetles.org. Photographs by Lawrence Blumer, reproduced with permission.
Tower and Arbeitman Journal of Biology 2009 8:38 doi:10.1186/jbiol141