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Cyclommatus elaphus
The largest species of Cyclommatus from Sumatra and the Malay Peninsula. Has extremely long mandibles relative to body length, with a ratio ranking among the world's top. The reddish-brown body and slender body shape radiate unique beauty.
Cyclommatus elaphus is a flagship and one of the largest species in the slender stag beetle genus Cyclommatus, found on Sumatra and the Malay Peninsula. It is celebrated for mandibles that are extremely long relative to body length, among the highest such ratios known. Its reddish-brown color and slender, elongate form give it a distinctive beauty. In captivity a small to medium enclosure is used, with adults fed insect jelly. Fine fermented substrate is used for oviposition, and larvae are reared in fungal substrate bottles or quality substrate. The long, delicate mandibles require careful handling. Maintaining moderately high humidity supports stable keeping of this popular species.
Source: Wikipedia (CC BY-SA 4.0)
The Elaphus Long-jawed Stag lives Adult 3-6 months.
The Elaphus Long-jawed Stag grows to 30-90mm.
The ideal temperature for the Elaphus Long-jawed Stag is 20〜26℃.
Origin
Sumatra and the Malay Peninsula
Lifespan
Adult 3-6 months
Size
30-90mm
Captive record (♂)
97.5 mm
Wild record (♂)
109 mm
Record source: BE-KUWA 2025 Edition (Elaphus, captive-bred 97.5mm, Nakagawa Motoki, 2013 / wild 109.0mm)
Notable localities
Among the largest of narrow red stag beetles. Characterized by slender, elongated mandibles. Wild record (109.0 mm) exceeds captive records. Breeding records are updated annually in BE-KUWA (Mushi-sha) contests. Individual value varies significantly based on locality, generation (CBF/WF/WD), and size.
Generation codes
Sources: BE-KUWA Certified Breeding Records (Mushi-sha, FY2025 edition, JA)
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Cyclommatus elaphus Gestro, 1881
Authority databases: GBIF
Nomenclature follows global taxonomic authority databases.
Plant Protection Act: When importing live specimens of Scarabaeoidea (including rhinoceros beetles, stag beetles, flower beetles, etc.), a species identification certificate issued by the exporting country government agency or equivalent must be attached in accordance with the Invasive Species Act (import ports are limited to Narita, Chubu, Kansai, Fukuoka, and Kagoshima airports). This species itself is not a designated invasive species, and import is possible upon submission of the certificate.
Sources: Ministry of the Environment, Invasive Species Act: "Guidance for Those Importing Live Insects in Scarabaeoidea" / CITES Appendix (checklist.cites.org)
Regulations may change. Always verify the latest information with the relevant authorities.
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Temperature
20〜26℃
Humidity
60〜80%
Tree sap, beetle jelly
Keep in a small to medium case. With its slender body and long mandibles, add footholds to prevent tipping and injury.
Maintain 20-26°C. It does best with slightly higher humidity, so do not let the substrate dry out.
Feed adults beetle jelly. Adults live about 3-6 months, so keep jelly available at all times.
Use fine-grained fermented substrate for egg laying. Raise larvae in fungus bottles or good-quality fermented substrate.
Handle carefully as the very long mandibles are delicate
Advanced. This is an advanced-level species. It requires specialized equipment and advanced husbandry skills with precise environmental control.
The ideal temperature for Elaphus Long-jawed Stag is 20〜26℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Elaphus Long-jawed Stag is Adult 3-6 months. With proper care and nutrition, they can live a long and healthy life.
Elaphus Long-jawed Stag typically reaches 30-90mm as an adult. Size may vary depending on care conditions and individual genetics.
Elaphus Long-jawed Stag feeds on: Tree sap, beetle jelly. Aim for a balanced diet with appropriate feeding frequency.
The price of Elaphus Long-jawed Stag varies significantly depending on bloodline, size, captive-bred generation, and sex. Check our market price page for the latest pricing information.
Last updated: August 31, 2026