
Source: Wikimedia Commons
Hexarthrius mandibularis
The largest Hexarthrius stag beetle in Southeast Asia. Attractive for its powerful mandibles and fierce temperament.
Hexarthrius mandibularis is the largest stag beetle in the genus Hexarthrius, native to Borneo and Sumatra in Southeast Asia. Males possess exceptionally long, curved mandibles extending well beyond half the body length, with total body lengths reaching 60–120 mm. The body is glossy black with a powerful, robust build. The species is notably aggressive; males are fierce fighters that must be handled with care, and supervised short-duration pairing is strongly recommended. Optimal captive temperature is 20–25°C. Adults are housed in large enclosures furnished with soft hardwood logs for egg-laying. Larvae are raised in fermented substrate or fungal substrate bottles. Adults feed on beetle jelly and live approximately 3–8 months. Its overwhelming mandible length and fierce temperament make H. mandibularis one of the most impressive and sought-after stag beetles among serious collectors.
Origin
Borneo and Sumatra, Southeast Asia
Lifespan
Adult 3-8 months
Size
60-110mm
Temperature
20〜27℃
Humidity
60〜80%
Insect jelly
気性が荒いためペアリングは短時間で
Sources: Wikipedia フタマタクワガタ属
Breeding season: Early summer to summer (adult active season)
Breeding notes
Females lay eggs in fermented wood or substrate; hatched larvae are reared in fermented mat or fungal (mycelium) bottles. After eclosion, adults require several months of dormancy before they are ready to breed.
Breeding requires planning, proper husbandry, and responsibility. These figures are general guidelines.
Sources: Wikipedia フタマタクワガタ属
Captive record (♂)
111.8 mm
Wild record (♂)
119.5 mm
Record source: BE-KUWA 2025年度版(マンディブラリス・スマトラ 飼育111.8mm 沈志穎 2025 / 野外119.5mm)
Notable localities
Regional subspecies
フタマタクワガタ最大種。野外レコード(119.5mm)が飼育を上回る。飼育レコードは BE-KUWA(むし社)のコンテストで毎年更新される。産地・累代(CBF/WF/WD)・サイズで個体価値が大きく変動する。
Generation codes
Sources: BE-KUWA 認定飼育レコード(むし社、2025年度版)
Edited & verified by: br-choku editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Hexarthrius mandibularis Deyrolle, 1881
Synonyms: Hexarthrius mandibularis sumatranus Mizunuma, 1994
Authority databases: GBIF
Nomenclature follows global taxonomic authority databases.
Plant Protection Act: コガネムシ上科(カブトムシ・クワガタムシ・ハナムグリ等)の生きた個体を輸入する際は、外来生物法に基づき輸出国政府機関等が発行する種類名証明書の添付が必要(輸入港は成田・中部・関西・福岡・鹿児島の各空港に限定)。本種自体は特定外来生物ではなく、証明書の添付により輸入可能。
Sources: 環境省 外来生物法「コガネムシ上科に含まれる生きた昆虫を輸入される方へ」 / CITES 附属書(checklist.cites.org)
Regulations may change. Always verify the latest information with the relevant authorities.
Find listings for this species
産卵は柔らかい材を使用
温度は22〜26℃が適温
幼虫は菌糸ビンで大型化
成虫の寿命は短めなので注意
Advanced. This is an advanced-level species. It requires specialized equipment and advanced husbandry skills with precise environmental control.
The ideal temperature for Mandibularis Stag Beetle is 20〜27℃. Recommended humidity is 60〜80%. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Mandibularis Stag Beetle is Adult 3-8 months. With proper care and nutrition, they can live a long and healthy life.
Mandibularis Stag Beetle typically reaches 60-110mm as an adult. Size may vary depending on care conditions and individual genetics.
Mandibularis Stag Beetle feeds on: Insect jelly. Aim for a balanced diet with appropriate feeding frequency.
The price of Mandibularis Stag Beetle varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: July 3, 2026