
Source: Wikimedia Commons
Cyclommatus metallifer
A stag beetle with extremely long mandibles relative to body length. Beautiful metallic sheen and slender body.
Cyclommatus metallifer, the metallifer stag beetle, is native to Sulawesi and the Maluku Islands, Indonesia. It is renowned for its extraordinarily long mandibles, which in large males can equal or even exceed the body length itself—a proportional extreme unmatched among stag beetles. Body length excluding mandibles is approximately 30–90 mm, and the body displays a striking metallic reddish-brown to golden sheen. The slender build combined with the metallic coloration gives it an elegant, almost jewel-like appearance. Optimal captive temperature is 22–26°C. A medium enclosure with hardwood egg-laying logs is appropriate; larvae develop relatively quickly, completing development in approximately 4–8 months. Adults live 3–8 months. Care must be taken when handling, as the elongated mandibles can inflict painful pinches. The combination of record-proportioned mandibles and vivid metallic coloration makes C. metallifer one of the most visually striking and popular exotic stag beetles.
Origin
Sulawesi and the Maluku Islands, Indonesia
Lifespan
Adult 3-8 months
Size
30-90mm
Temperature
20〜28℃
Humidity
60〜80%
Insect jelly
Captive record (♂)
101.7 mm
Wild record (♂)
100 mm
Record source: BE-KUWA 2025年度版(metallifer finae 飼育101.7mm 2025 / 野外100.0mm)
Notable localities
Regional subspecies
亜種 finae が最大化(飼育レコード: finae101.7 / 原名亜種99.8 / isogaii90.7mm)。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:
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: Cyclommatus metallifer (Boisduval, 1835)
Synonyms: Lucanus metallifer Boisduval, 1835
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
大顎が非常に長く体長の半分以上
温度は22〜26℃が適温
メタリックな光沢が美しい
材産みのため産卵木を用意
幼虫はマットでも菌糸でも育つ
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The ideal temperature for Metallifer Stag Beetle is 20〜28℃. Recommended humidity is 60〜80%. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Metallifer Stag Beetle is Adult 3-8 months. With proper care and nutrition, they can live a long and healthy life.
Metallifer Stag Beetle typically reaches 30-90mm as an adult. Size may vary depending on care conditions and individual genetics.
Metallifer Stag Beetle feeds on: Insect jelly. Aim for a balanced diet with appropriate feeding frequency.
The price of Metallifer Stag Beetle varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: June 23, 2026