The mandible character of the Lucanidae is vary by considering of developmental difference in male individual specimen. Especially, species of Genus Cyclommatus Parry, 1862 presents strong mandibular allometry. In this research, The species group which related to Cyclommatus montanellus Möllenkamp, 1904 has been evaluated for the first time in this research with inner teeth composition and positioning to establish clear taxonomic key to each species.

• Eunjoong Kim(Upo dragonfly world, Changnyeong Agricultural technology center, Changnyeong-gun, Korea)
• Jong Bong Choi(Department of Ecological Science, Graduate school, Kyungpook National University)
• Hyun Ji Lee(Department of Ecological Science, Graduate school, Kyungpook National University)
• Jae Seok Lee(Major in Applied biology, College of Ecology and Environmental Science, Kyungpook National University)
• Chang Hoe Jeong(Major in Applied biology, College of Ecology and Environmental Science, Kyungpook National University)
• Tae Yung Kwon(Major in Applied biology, College of Ecology and Environmental Science, Kyungpook National University)
• Eun Mi Kim(Major in Applied biology, College of Ecology and Environmental Science, Kyungpook National University)
• Jong kyun Park(Department of Ecological Science, Graduate school, Kyungpook National University, Major in Applied biology, College of Ecology and Environmental Science, Kyungpook National University)