In order to assess the Goyens J, Dirckx J, Dierick M, Van Hoorebeke L, Aerts P (2014) Biomechanical determinants of bite force dimorphism in Cyclommatus metallifer stag beetles. Cyclommatus is a genus of the family Lucanidae, also known as the stag beetle.The majority of the species from the genus Cyclommatus are located in Southeast Asia, though some species are found in China and Taiwan as well. pmid:24671962 . J Exp Biol 217:1065–1071. doi: 10.1242/jeb.091744 Article PubMed Google Scholar This Indonesian species belongs to the genus Cyclommatus, which includes (together with the genus Prosopocoilus) stag beetle species with the most oversized male mandibles (Gotoh et al., 2012; Kawano, 2006). The genus Cyclommatus also consists of three subgenera: Cyclommatus (Parry, 1863), Cyclommatinus (Didier, 1927) and Cyclommatellus (Nagel, 1936). The big unique antenna of the males contains various lamellate plates (Leaf like layers), similar to the rest of the representatives of the genre. J Exp Biol 217: 1065–1071. Here we describe the functional mechanism behind the force modulation behaviour. However, lesser stags are black all over with matt wing cases, while female stag beetles have shiny brown wing cases. It is known that owners of larger fighting apparatuses are favoured to win the male-male fights, but it was unclear whether male stag beetles also need to produce high bite forces while grabbing and lifting opponents in fights. Male stag beetles carry large and heavy mandibles that arose through sexual selection over mating rights. Lesser stag beetles tend to have a much squarer overall look. mandibular apparatus and the bite force in Cyclommatus metallifer Boisduval 1835 stag beetles. The morphology of these jaws has to be a compromise between robustness (to withstand the bite forces), length and weight. Male stag beetle with its striking mouthparts, or mandibles. Researchers have staged stag beetle battles to solve the mystery of how the male beetles bite so hard. Cyclommatus metallifer stag beetles circumvent this trade-off by reducing their bite force when biting with their slender jaw tips. Download our beetle ID guide for a closer look: Although the mandibles of Cyclommatus metallifer males are used in pugnacious fights, they are surprisingly slender. Goyens J, Dirckx J, Dierick M et al (2014a) Biomechanical determinants of bite force dimorphism in Cyclommatus metallifer stag beetles. If handled carelessly, their pinch can draw blood from a person. Cyclommatus metallifer stag beetles circumvent this trade-off by reducing their bite force when biting with their slender jaw tips. Male stag beetles (Lucanidae) use their extremely elongated jaws to pinch their rivals forcefully in male–male battles. We show that male Cyclommatus metallifer stag beetles bite three times as forcefully as females. The sensors enable stag beetles to modulate their bite force to prevent failure. A few of them grow larger up to 1.25 inches or further than that. The morphology of these jaws has to be a compromise between robustness (to withstand the bite forces), length and weight. Abstract. View Article PubMed/NCBI Google Scholar 7. Stag beetles, usually, don”t bite anyone, though they are comparatively bigger in size. It is endangered and is the UK's biggest terrestrial beetle. Stag beetle, (family Lucanidae), also called pinching bug, any of some 900 species of beetles (insect order Coleoptera) in which the mandibles (jaws) are greatly developed in the male and resemble the antlers of a stag.In many species the elaborately branched and toothed mandibles may be as long as the beetle itself. The beetle most often mistaken for a female stag beetle is the lesser stag beetle. 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