Fig. 1 a, b in When dwarf males and hermaphrodites copulate: first record of mating behaviour in a dwarf male using the androdioecious barnacle Scalpellum scalpellum (Crustacea: Cirripedia: Thoracica)

Fig. 1 a, b Morphology of the androdioecious barnacle Scalpellum scalpellum. a A large, solitary hermaphrodite with the right side mantle valve partly cut open to reveal the thoracic cirri and the penis; a cut away penis shown above; note the rather short length of the penis compared to the body size. b A group of three adult hermaphrodites; two