Japanese rhinoceros beetle

Trypoxylus dichotomus is a large East Asian scarab beetle. Males bear prominent forked horns used in contests over access to feeding sites and mates.

Scarabaeidae: Scarabaeidae is a diverse family of beetles that includes scarabs, dung beetles, and rhinoceros beetles. This family places Trypoxylus among scarabs with varied feeding habits and forms.
Sexual selection: Sexual selection is evolution driven by differences in mating success among individuals. Competition among males helps explain the evolution of conspicuous horns.
Japanese beetle keeping: Japanese beetle keeping is the practice of collecting, rearing, and observing beetles as pets or hobby animals. This species is a familiar and popular captive beetle in Japan.
Trypoxylus dichotomus septentrionalis: Trypoxylus dichotomus septentrionalis is a northern Japanese subspecies of the Japanese rhinoceros beetle. It is one regional form within the species, found in northern Japan.
Complete metamorphosis: Complete metamorphosis is insect development through distinct egg, larval, pupal, and adult stages. The beetle's large grubs and horned adults occupy dramatically different life stages.
Intraspecific competition: Intraspecific competition occurs when members of one species contend for limited resources. Males use their horns to compete with other males near feeding sites.
Insect collecting: Insect collecting is the acquisition and study of insects as specimens or living animals. Its size and horns make it a sought-after species among collectors.
Trypoxylus dichotomus takarai: Trypoxylus dichotomus takarai is a named Ryukyu Islands subspecies of the Japanese rhinoceros beetle. Its island distribution shows the species' geographic variation across Japan.
Beetle: Beetles are insects in the order Coleoptera, distinguished by hardened forewings called elytra. Its protective elytra identify it as a member of this exceptionally diverse insect order.
Allometry: Allometry describes how a body's proportions change with overall size or among its parts. Horn size can increase disproportionately with body size in males.

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Hercules beetleCompared with: It is a familiar rhinoceros beetle with a different range and body form.