Cybister lewisianus Sharp, 1873

Jiang, Zhuo-Yin, Zhao, Shuang, Mai, Zu-Qi, Jia, Feng-Long & Hendrich, Lars, 2023, Review of the genus Cybister in China, with description of a new species from Guangdong (Coleoptera: Dytiscidae), Acta Entomologica Musei Nationalis Pragae 63 (1), pp. 75-102 : 85

Cybister lewisianus Sharp, 1873

( Figs 7A–E ; 21A)

Cybister lewisianus Sharp, 1873: 46 (orig. descr.); SHARP (1882): 732 (Shanghai); RḖGIMBART (1899): 350 (Shanghai, Jiangxi); FENG (1932): 36 (Anhui:Wuhu, Beijing, Hubei:Wuchang, Jiangsu:Suzhou, Zhejiang: Hangzhou and Jiaxing); ZHAO (1981): 110 (Fujian); ZENG (1989): 92 (Anhui, Beijing, Hubei, Jiangsu, Zhejiang); LI (1992): 36 (Liaoning).

Material examined. CHINA: GUANGDONG: 2 JJ 1 ♀, Nanhai District, Jiujiang Township, 16.xi.1957, D. X. Gu leg. ( SYSU); 6JJ 2♀♀,

Guangzhou, 14.xi.1964, T. X. Peng got from market ( SYSU). HAINAN:

1 ♀, Mt. Wuzhishan at Wuzhishan city, 15–24.vii.2011, Jingke Li leg.

( SYSU). HUBEI: 2JJ 2♀♀, Wuchang, vii.1956, Q. Y. Hu leg.( SYSU).

Diagnosis. TL 23–27 mm, elongate, oblong-oval ( Fig. 7A ). Head dark green, clypeus reddish-brown. Pronotum and elytra dark green to black, with distinct yellow margins laterally. Ventral surface black, with lateral part of metaventrite and metacoxae reddish-brown; abdominal ventrites III–V with a yellow spot on each side ( Fig. 7B ). Dorsal surface smooth in both sexes. Prosternal process lanceolate, with distinct lateral bead, surface flat, apex pointed; lateral parts of metaventrite tongue-shaped, slender, not reaching lateral margins; metacoxal lines distinct, well impressed, nearly parallel medially, divergent anteriorly, along metacoxal lines with a row of punctures. Forelegs yellow, midlegs and hindlegs yellow to reddish-brown; protarsomeres 1–3 of male broadly expanded into a palette, with four rows of adhesive setae on their ventral side; both sexes with a single metatarsal claw. Median lobe of aedeagus ʻCʼ- shaped in lateral view, moderately curved ( Fig. 7C ); slender in ventral view, apex rounded ( Fig. 7D ). Parameres moderately broad, strap-like apically ( Fig. 7E ).

Habitat. This species inhabits large ponds with aquatic plants ( MORI & KITAYAMA 1993).

Distribution. China (Anhui, Beijing, Guangdong, Hainan, Hebei, Hubei, Jiangsu, Jiangxi, Liaoning, Shanghai, Zhejiang) ( Fig. 21A), India, Indonesia, Japan, Vietnam (RḖGIMBART 1899; ZIMMERMANN 1920; FENG 1932, 1933b; GSCHWENDTNER 1938; ZAITZEV 1972; ZENG 1989; MORI & KITAYAMA 1993; NILSSON 1995; GHOSH & NILSSON 2012; NILSSON & HÁJEK 2022b). First record from Guangdong and Hainan.

Figures

Fig. 7. Cybister lewisianus Sharp, 1873 (J, Guangzhou, Guangdong).A – habitus in dorsal view; B – habitus in ventral view; C – median lobe of aedeagus in lateral view; D – median lobe of aedeagus in ventral view; E – paramere. Scale bars: 5.0 mm (A, B), 1.0 mm (C–E).