Eurystylus ryukyus Yasunaga, Nakatani & Cherot 2017

Eurystylus ryukyus Yasunaga, Nakatani & Chérot, 2017 (Figs 1H, 2F–H) Eurystylus ryukyus Yasunaga et al. 2017: 312; Kim et al. 2025: 29. Diagnosis and description. See Yasunaga et al. (2017) for the diagnosis and the detailed original description. Male genitalia: left paramere with broad and round hypophysis (Fig. 2F); right paramere rod-shaped, with hook-shaped hypophysis (Fig. 2G); endosoma membranous, with five noticeable sclerites; primary lobal sclerite (pl) thick and curved; third lobal sclerite (tl), fourth lobal sclerite (fl) and median lobal sclerite (ml) broad and apically sharp; basal sclerotized teeth (bt) small near secondary gonopore (Fig. 2H). Biology. This species is known to be primarily collected from the flowers of various plants. For detailed information on its specific host plants, see Yasunaga et al. (2017). In the present study, the specimen was also collected from the flowers of broad-leaved trees. Distribution. Japan, Taiwan, Vietnam. Material examined. [ISNB] 2♂♂, Tam Dao National Park, Phu Tho Province, Vietnam, 25-28.viii.2010, J. Constant & P. Limbourg leg. (FC n° 11089-11090); [ISNB] 1♂ 6♀♀, 1?, Cuc Phuong National Park, Ninh Binh Province, Vietnam, 11-18.vii.2010, J. Constant & P. Limbourg leg. (FC n°s 11081-11088); [CNU] 1♂, Bach Ma National Park, Loc Tri, Phu Loc, Hue City, Vietnam, 22.vi.2023, J. Jeon leg.; [ZCDTU] 1♀, Hoa Trung Lake (16.08910 N, 108.04250 E, 90 m altitude), Hoa Lien Ward, Hoa Vang District, Da Nang City, Vietnam, 10.iv.2025, J. Kim leg. (DTUHMM0066).