
AI-generated image
Dorcus striatipennis
A small stag beetle with longitudinal grooves on the elytra. Resembles the kokuwa but small males and females show clear striations. A hardy, common species from lowlands to high mountains.
The suji stag beetle (Dorcus striatipennis) is a small lucanid found from Hokkaido to Kyushu, with males 13.5-40 mm and females 14-24 mm. Its epithet striatipennis means "grooved wings," and true to the name, fine longitudinal grooves run along the elytra — though these are clear only in small males and all females, fading in large males. It closely resembles the kokuwa stag beetle but is smaller, and ranges from lowlands to high mountains, being especially common at higher elevations. Adults gather at oak sap from May to September and are found on willow twig tips at altitude. Hardy and overwintering as an adult, it lives 1-2 years in captivity and breeds readily on wood or fermented mat, making it a beloved beginner species alongside the kokuwa.
Origin
Japan (Hokkaido, Honshu, Shikoku, Kyushu)
Lifespan
Adult 1-2 years (overwinters)
Size
Male 13.5-40mm / Female 14-24mm
Temperature
18〜28℃
Humidity
50〜70%
Beetle jelly, tree sap
Hardy at 18-28°C; no special care needed
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.
Plant Protection Act: 国産(在来)種のため、生体輸入に関わる外来生物法の種類名証明書は不要。
在来種だが、飼育・購入した個体を野外に放すことは避けること。他産地・他亜種の個体を逃がすと地域の野生個体群との交雑・遺伝的撹乱を招く。
Regulations may change. Always verify the latest information with the relevant authorities.
Find listings for this species
Striated elytra (the epithet striatipennis means "grooved wings")
Like kokuwa but small males and females show clear grooves (faint in large males)
Breeds easily on wood or fermented mat
May-Sep; at altitude also on willow twig tips
Beginner. This is a beginner-friendly species. No special equipment or experience is required, and it can be kept successfully with basic care setup.
The ideal temperature for Suji Stag Beetle is 18〜28℃. Recommended humidity is 50〜70%. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Suji Stag Beetle is Adult 1-2 years (overwinters). With proper care and nutrition, they can live a long and healthy life.
Suji Stag Beetle typically reaches Male 13.5-40mm / Female 14-24mm as an adult. Size may vary depending on care conditions and individual genetics.
Suji Stag Beetle feeds on: Beetle jelly, tree sap. Aim for a balanced diet with appropriate feeding frequency.
The price of Suji Stag Beetle varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: June 25, 2026