Hydriomena impluviata (Denis & Schiffermuller, 1775)

Beljaev, Evgeniy A., Vasilenko, Sergey V., Dubatolov, Vladimir V. & Zinchenko, Vadim K., 2024, First report on late autumn geometer moths (Lepidoptera: Geometridae) from Kunashir Island, Russia (Southern Kurils), Amurian Zoological Journal XVI (4), pp. 979-995 : 989

Hydriomena impluviata ([Denis & Schiffermüller], 1775)

Material. Andreevskii Cordon, mixed forest, on birch, 19.11.2023 (Zinchenko) – 1♀.

Distribution. Russia (European part, N Caucasus, Urals, West Siberia, South Siberia, S Jakutia, RFE: Magadanskaya Obl., Kamchatka Pen., Amur Obl., Jewish A.O., Khabarovsk Kr., Primorsky Kr., Sakhalin, S Kurils – Kunashir); Japan (Hokkaido, Honshu, Shikoku, Kyushu), North Korea, South Korea, China, N Mongolia, Kazakhstan,? Kyrgyzstan, Turkey, Europe.

Remarks. In East Asia, this species is represented by the subspecies H. impluviata extremata Bryk, 1942 (= H. impluviata insulata Inoue, 1953 ), described from Kunashir Island ( Bryk 1942). The specimen collected on Kunashir was discovered at a time that is atypical for the flight of moths of this species. In the continental territories of the Far East at the same latitudes, this species typically flies in one generation from the end of May to mid-July. In Japan, H. impluviata inhabits mountainous areas up to the alpine zone and is usually seen from July to August, supposedly having a univoltine life cycle. In some regions, however, it can appear from May to June or July to August, exhibiting bivoltine life cycles ( Nakajima, Yazaki 2011). Therefore, the specimen from Kunashir is likely an accidentally hatched individual from the wintering generation. The larvae feed on various leaved woody plants, preferring Betulaceae and Salicaceae .