Larval stages of Callipogon relictus (Semenov) (Coleoptera: Cerambycidae), a gigantic longhorn beetle designated as a natural monument of Korea, has never been studied as it is hardly discovered in nature. The DNA barcoding gene, mt-COI, was used to identify a dead larva found in the Gwangneung forest of the Korea National Arboretum. Based on the result, we provide the morphology of the immature stage, with the illustrations of diagnostic characteristics.

• Jongok Lim(Division of Forest Biodiversity, Korea National Arboretum)
• Minyoung Kim(Department of Agricultural Biotechnology, Seoul National University)
• Sunghoon Jung(Department of Agricultural Biotechnology, Seoul National University)
• Il-kwon Kim(Division of Forest Biodiversity, Korea National Arboretum)
• Jong-su Lim(Division of Forest Biodiversity, Korea National Arboretum)
• Shin-young Park(Division of Forest Biodiversity, Korea National Arboretum)
• Gyeong-mi Kim(Division of Forest Biodiversity, Korea National Arboretum)
• Cheolhak Kim(K-INSECT Co., Ltd.)
• Bong-kyu Byun(Department of Biological Sciences, Hannam University)
• Bong-woo Lee(Division of Forest Biodiversity, Korea National Arboretum)
• Seunghwan Lee(Department of Agricultural Biotechnology, Seoul National University)