page_title: Japanese rhinoceros beetle
section_title: Description
hierarchical_section_title: Japanese rhinoceros beetle / Description
caption_attribution_description: English: Allomyrina dichotoma from Nam-To, Taiwan
context_page_description: The Japanese rhinoceros beetle, Japanese horned beetle, or kabutomushi, Allomyrina dichotoma, is a species of rhinoceros beetle.
context_section_description: Allomyrina dichotoma shows a striking sexual dimorphism. The males are much larger, reaching a length of 40–80 mm, while females can reach a length of about 40–60 mm. The long cephalic horn of this species has a characteristic shape in the form of the letter Y and it is used by males during the mating period and to maintain territories. By means of their forked horn they lift other males off the ground and throw them into the air. In addition to their impressive and ornate protuberance they also have a smaller thoracic horn, also forked. Their eyes may be white or red and are adapted to low light levels, as this species is nocturnal. The body is dark brown, while the ventral part of the body is black, brilliant and the front legs are unusually long. Like all Dynastinae species, these beetles are strong flyers, although they never cover long distances during the flight. The preferred foods are tree saps, fruits and anything sugary.
caption: 'Allomyrina dichotoma' male from Taiwan
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