
Source: Wikimedia Commons
Dorcus alcides
A large flat stag beetle from Sumatra. Short-tooth and long-tooth forms each with different charm.
Dorcus alcides, the Alcides flat stag beetle, is a large stag beetle native to Sumatra, Indonesia, comparable in size to the Palawan stag beetle among Dorcus species. Adults reach 40–100 mm in body length. The species is notable for its pronounced mandible dimorphism: males occur in distinct short-tooth and long-tooth forms, each with its own distinctive appeal for collectors. Body coloration is a deep glossy black, with the broad, flattened body form characteristic of flat stag beetles. Optimal captive temperature is 22–26°C. A large enclosure with both hardwood logs and fermented substrate accommodates both oviposition preferences—females lay eggs in either medium. Larvae develop well in fungal substrate bottles or fermented substrate. Adults live approximately 1–2 years. The dual appeal of targeting both mandible forms in selective breeding programs, combined with impressive maximum size, makes D. alcides a popular advanced species among Dorcus enthusiasts.
Origin
Sumatra, Indonesia
Lifespan
Adult 1-2 years
Size
40-100mm
Temperature
20〜28℃
Humidity
60〜80%
Insect jelly
Large case with wood and substrate
Captive record (♂)
98.3 mm
Wild record (♂)
104 mm
Record source: BE-KUWA 2025年度版(飼育98.3mm 里由一 2009 / 野外104.0mm)
Notable localities
野外レコード(104.0mm)が飼育レコード(98.3mm)を上回る希少な例。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: Dorcus alcides (Snellen van Vollenhoven, 1865)
Synonyms: Dorcus alcides, Eurytrachelus alcides Snellen van Vollenhoven, 1865
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
22-26°C is optimal
Lays in both wood and substrate
Very strong pinching force, be careful
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The ideal temperature for Alcides Stag Beetle is 20〜28℃. Recommended humidity is 60〜80%. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Alcides Stag Beetle is Adult 1-2 years. With proper care and nutrition, they can live a long and healthy life.
Alcides Stag Beetle typically reaches 40-100mm as an adult. Size may vary depending on care conditions and individual genetics.
Alcides Stag Beetle feeds on: Insect jelly. Aim for a balanced diet with appropriate feeding frequency.
The price of Alcides 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