Species information
Scientific name: Paratrichius duplicatus okinawanus
Japanese name: オオシマトラフコガネ 沖縄亜種
Chinese name: 雙環斑金龜（沖繩亞種）
English name: Paratrichius duplicatus okinawanus
Origin: Okinawajima, Kumejima, Iheyajima
Ecology and description
Paratrichius duplicatus okinawanus is a small scarab beetle of the Okinawa Islands, with a body length of 11.7–13.5mm. Adults appear from March to May and are not abundant. They are occasionally found on the flowers of the Itajii chinkapin (Castanopsis sieboldii var. lutchuensis) in spring.
Females of Paratrichius duplicatus okinawanus are less common. Online observation records give a ratio of about one female to 20–30 individuals, possibly because females visit flowers more often at higher positions and are therefore harder to encounter near the ground.
Paratrichius duplicatus okinawanus is easily confused with related taxa. The distributions of these taxa are as follows:
- Paratrichius duplicatus duplicatus: Amami Islands
- Paratrichius duplicatus okinawanus: Okinawa Islands
References:
日本列島の甲虫目録 (55.8ハナムグリ亜科)
兵庫の昆虫雑誌「きべりはむし」
日本産コガネムシ図鑑 (オキナワトラフハナムグリ)
やんばるの森 (オキナワトラフハナムグリ)
中国经济昆虫志第46冊 (reference for the Chinese names)
Field photographs taken during our tours, with observation dates
Paratrichius duplicatus okinawanus may be seen on the 【Forest Walk】 tour in spring.
