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Platycerus delicatulus
About 13 mm long and the largest Platycerus in Japan. Males are green while females vary through coppery red, blue and black. It appears in high-elevation beech forest from spring into early summer.
Platycerus delicatulus is the largest of the four Platycerus species in Japan, about 13 mm long. Males are green and females range through coppery red, blue and black, and the lapis-like sheen has earned the genus a keen following among collectors. Unlike most stag beetles it appears in high-elevation beech forest from spring into early summer, and in winter it is usually collected by splitting standing dead trunks and fallen logs to find adults overwintering in their pupal chambers. It resembles P. kawadai but is less glossy, and the hind corners of the pronotum are rounded rather than pointed. The larvae develop in soft but relatively dry rotten wood of large diameter. Unlike the related P. acuticollis it is rarely recorded flying to beech buds. Because the adults are small and short-lived and temperature control is essential in warm lowland cities, the genus drew no attention during the stag beetle boom from the 1990s on. The species is listed as near threatened in Yamaguchi and Fukuoka prefectures.
Source: Wikipedia (CC BY-SA 4.0)
The Japanese Blue Stag Beetle lives Adults 8 months to 1 year.
The Japanese Blue Stag Beetle grows to About 13mm.
Origin
Japan (Honshu, Shikoku and Kyushu; the subspecies unzendakensis on Mt Unzen and Mt Tara)
Lifespan
Adults 8 months to 1 year
Size
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: Platycerus delicatulus Lewis, 1883
Synonyms: Platycerus delicatulus delicatulus, Platycerus delicatulus unzendakensis
Authority databases: GBIF
Nomenclature follows global taxonomic authority databases.
Sources: CITES Appendix (checklist.cites.org)
Regulations may change. Always verify the latest information with the relevant authorities.
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About 13mm
Temperature
20〜28℃
Humidity
60〜80%
Larvae eat rotten wood; adults take sap from the buds of beech and similar trees
It lives in cool, high-elevation beech forest, and temperature control is described as essential in warm lowland cities. Whether summer heat can be kept off the beetles decides whether they can be kept at all.
The larvae develop in soft but relatively dry rotten wood, in standing dead trunks and fallen logs of large diameter. The related P. acuticollis instead uses wet rotten wood lying on the forest floor, so even within the genus the preferred state of the wood differs.
It is a small beetle of about 13 mm and the male's mandibles are not enlarged, but it is still kept one to a container. Species in this genus are hard to tell apart, so beetles of different species or localities should not share a container.
Adults appear from spring into early summer and, being small, are short-lived. Through autumn and winter they sit as adults in their pupal chambers, and these are the beetles found when wood is split.
The species is listed as near threatened in Yamaguchi and Fukuoka prefectures. Members of the genus are separated on subtle colour, the shape of the pronotum and the genitalia, so a stereo microscope is needed for a reliable identification and even sexing is difficult. Do not mix beetles from different localities.
Advanced. This is an advanced-level species. It requires specialized equipment and advanced husbandry skills with precise environmental control.
The average lifespan of Japanese Blue Stag Beetle is Adults 8 months to 1 year. With proper care and nutrition, they can live a long and healthy life.
Japanese Blue Stag Beetle typically reaches About 13mm as an adult. Size may vary depending on care conditions and individual genetics.
Japanese Blue Stag Beetle feeds on: Larvae eat rotten wood; adults take sap from the buds of beech and similar trees. Aim for a balanced diet with appropriate feeding frequency.
The price of Japanese Blue Stag Beetle varies significantly depending on bloodline, size, captive-bred generation, and sex. Check our market price page for the latest pricing information.
Last updated: September 17, 2026