The body is dark brown, while the ventral part of the body is black and brilliant and the front legs are unusually long. Their eyes may be white or red and are adapted to low light levels, as this species is nocturnal. In addition to their impressive and ornate protuberance they also have a smaller thoracic horn, also forked. By means of their forked horn they lift other males off the ground and throw them into the air. 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. The males are much larger, reaching a length of 40–80 mm, while females can reach a length of about 40–60 mm. Mounted specimen Allomyrina dichotoma male from TaiwanĪllomyrina dichotoma shows a striking sexual dimorphism. Description Allomyrina dichotoma, male and female. Allomyrina dichotoma shizuae: Yakushima Island, Tanegashima Island.Allomyrina dichotoma tsuchiyai: Kuchinoerabu Island.Allomyrina dichotoma politus: Indochina.Allomyrina dichotoma tunobosonis: Taiwan.Allomyrina dichotoma septentrionalis: Tsushima Island, Honshu, Shikoku, Kyushu.Allomyrina dichotoma inchachina: Kume Island.Allomyrina dichotoma dichotoma: Mainland China, Korean Peninsula.In Chinese the beetle is called '獨角仙' (which translates to 'single-horned immortal') or '雙叉犀金龜'. The beetle's Korean name 'Jangsupungdeng-i (장수풍뎅이, "General beetle") sounds very different but is similar in nature. Mushi is Japanese for insect, and kabuto is Japanese for helmet, literally referring to the samurai helmet. In Japanese, rhinoceros beetles are called kabutomushi ( かぶとむし, also written 甲虫 or かぶと虫). ' Kabuto insect'), is a species of rhinoceros beetle. Allomyrina dichotoma, also known as Japanese rhinoceros beetle, Japanese horned beetle, or kabutomushi ( カブトムシ, lit.
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