The morphology of these jaws has to be a compromise between robustness (to withstand the bite forces), length and weight. Researchers have staged stag beetle battles to solve the mystery of how the male beetles bite so hard. pmid:24671962 . The big unique antenna of the males contains various lamellate plates (Leaf like layers), similar to the rest of the representatives of the genre. 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. The genus Cyclommatus also consists of three subgenera: Cyclommatus (Parry, 1863), Cyclommatinus (Didier, 1927) and Cyclommatellus (Nagel, 1936). If handled carelessly, their pinch can draw blood from a person. doi: 10.1242/jeb.091744 Article PubMed Google Scholar View Article PubMed/NCBI Google Scholar 7. The morphology of these jaws has to be a compromise between robustness (to withstand the bite forces), length and weight. Download our beetle ID guide for a closer look: Cyclommatus metallifer stag beetles circumvent this trade-off by reducing their bite force when biting with their slender jaw tips. We show that male Cyclommatus metallifer stag beetles bite three times as forcefully as females. Male stag beetles (Lucanidae) use their extremely elongated jaws to pinch their rivals forcefully in male–male battles. 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). A few of them grow larger up to 1.25 inches or further than that. Goyens J, Dirckx J, Dierick M et al (2014a) Biomechanical determinants of bite force dimorphism in Cyclommatus metallifer stag beetles. Male stag beetle with its striking mouthparts, or mandibles. Stag beetles, usually, don”t bite anyone, though they are comparatively bigger in size. Stag beetles only exists as adults for a … Although the mandibles of Cyclommatus metallifer males are used in pugnacious fights, they are surprisingly slender. 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. However, lesser stags are black all over with matt wing cases, while female stag beetles have shiny brown wing cases. Lesser stag beetles tend to have a much squarer overall look. Male stag beetles carry large and heavy mandibles that arose through sexual selection over mating rights. In order to assess the 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. Our bite force measurements show a muscle force reduction of 18% for tip biting when compared with bites with the teeth located halfway along the mandibles. mandibular apparatus and the bite force in Cyclommatus metallifer Boisduval 1835 stag beetles. Here we describe the functional mechanism behind the force modulation behaviour. Cyclommatus metallifer stag beetles circumvent this trade-off by reducing their bite force when biting with their slender jaw tips. Goyens J, Dirckx J, Dierick M, Van Hoorebeke L, Aerts P (2014) Biomechanical determinants of bite force dimorphism in Cyclommatus metallifer stag beetles. J Exp Biol 217:1065–1071. 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