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Montanellus Long-jawed Stag Beetle
AdvancedCyclommatus montanellus
A montane Cyclommatus from Borneo and, at a wild record of 79.0 mm, a large one for the genus. Its slender mandibles take up close to half its length. It prefers cool conditions and is regarded as hard to breed on.
Difficulty
Advanced
Temperature
20〜28℃
Lifespan
Adults 4-6 months (typical for the genus)
Size
Males 22.7-79.0 mm (wild record 79.0 mm; the captive record is 76.2 mm)
Humidity
60〜80%
Diet
Beetle jelly (in the wild it visits flowers of herbaceous plants)
About
The montanellus long-jawed stag (Cyclommatus montanellus) was described in 1904 from Borneo, and 90 of the 104 specimen records in GBIF come from Sabah in Malaysia. The BE-KUWA wild record is 79.0 mm against a captive record of 76.2 mm, placing it among the larger members of the genus. The smallest certified beetle is 22.7 mm, and in small males the mandibles are short and straight. As the specific name suggests it is a montane species, and breeders report that it likes cool conditions and is somewhat difficult to keep going. Females in particular pupate ahead of the males, so the sexes emerge out of step and a line is only maintained by deliberately raising small males to match them. Care follows the genus: a firmly packed set of soft log and fine fermented substrate, with enough ventilation to keep the box from going stale. Larvae are reared on fermented substrate rather than fungus bottles.
Source: Wikipedia (CC BY-SA 4.0)
Lifespan of the Montanellus Long-jawed Stag Beetle
The Montanellus Long-jawed Stag Beetle lives Adults 4-6 months (typical for the genus).
Size of the Montanellus Long-jawed Stag Beetle
The Montanellus Long-jawed Stag Beetle grows to Males 22.7-79.0 mm (wild record 79.0 mm; the captive record is 76.2 mm).
Basic Info
Origin
Borneo, chiefly Sabah in Malaysia
Lifespan
Adults 4-6 months (typical for the genus)
Size
Males 22.7-79.0 mm (wild record 79.0 mm; the captive record is 76.2 mm)
Care Specifications
Breeding Records & Localities
Captive record (♂)
76.2 mm
Wild record (♂)
79 mm
Record source: BE-KUWA 2025 edition (Montanellus, captive 76.2 mm, 高木将吾 2012 / wild 79.0 mm; projected maximum 84 mm. Smallest record 22.7 mm, 陳威佑 2021; literature minimum 24.4 mm)
Notable localities
Sabah, Borneo (Malaysia)Kalimantan (Indonesia)
The captive record of 76.2 mm dates from 2012 and still falls short of the 79.0 mm wild record, which reflects how hard the species is to keep going in culture.
Generation codes
- WD
- Wild-caught
- WF1
- Offspring of a wild-caught female
- F1〜
- Captive generations (same locality)
- CBF1
- Cross-locality captive-bred (reset)
Sources: BE-KUWA Certified Breeding Records (Mushi-sha, FY2025 edition PDF, JA) / Cyclommatus - Wikipedia (JA)
References & Sources
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.
Primary sources
- Wikipedia
- Ministry of the Environment, Invasive Species Act: "Guidance for Those Importing Live Insects in Scarabaeoidea"
- CITES Appendix (checklist.cites.org)
- BEETLE SCHOOL - Rearing Cyclommatus (egg-laying set, larval rearing, larval period, adult lifespan, breeding cautions)
- Ben's Beetle Breeding Pages - Cyclommatus montanellus (distribution and breeding notes)
- BE-KUWA Certified Breeding Records (Mushi-sha, FY2025 edition PDF, JA)
- GBIF
Taxonomy & Authority
Accepted name: Cyclommatus montanellus Möllenkamp, 1904
Authority databases: GBIF
Nomenclature follows global taxonomic authority databases.
Regulations & Conservation Status
Not CITES-listed
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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