Cybister chinensis Motschulsky, 1854

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 : 77-79

publication ID	https://doi.org/ 10.37520/aemnp.2023.003
publication LSID	lsid:zoobank.org:pub:937DF12A-BC2F-4406-802F-63838312B0C1
persistent identifier	https://treatment.plazi.org/id/03975B72-FFC1-760D-95B2-CD6D55C7FF2F
treatment provided by	Felipe
scientific name	Cybister chinensis Motschulsky, 1854
status

Treatment

Cybister chinensis Motschulsky, 1854 View in CoL View at ENA

( Figs 2A–E View Fig ; 18A–C View Fig ; 19A View Fig ; 20A View Fig )

Cybister chinensis Motschulsky, 1854: 44 View in CoL (orig. descr.).

Cybister japonicus Sharp, 1873: 45 View in CoL (orig. descr.), synonymy by ZAITZEV (1915): 284 and confirmed by NILSSON & PETROV (2007): 43; SHARP (1882):748 (Manchuria, Shandong, Taiwan);RḖGIMBART (1899): 348

(Manchuria, Taiwan); FENG (1932): 36 (Beijing, Fujian: Fuzhou and Xiamen, Guangdong, Hainan, Manchuria, Shandong:Yantai, Taiwan); FALKENSTRÖM (1936): 244 (Sichuan); FENG (1936): 13 (Liaoning: Shenyang, Shaanxi); GSCHWENDTNER (1938): 76 (Manchuria, Taiwan); BRINCK (1946): 151 (Heilongjiang, Liaoning); ZAITZEV (1972): 360 (Taiwan); ZHAO (1981): 110 (Fujian); ZENG (1989): 90 (NE China, Fujian, Guangdong, Hainan, Hebei, Ningxia: Yinchuan, Shandong, Taiwan); LI (1992): 36 (Jilin, Liaoning); MORI & KITAYAMA (1993): 145 (Taiwan).

Material examined. CHINA: GUANGDONG: 3 JJ, Canton, 1.–21.

iii.2001, L. Hojný leg. ( NMPC). NINGXIA: 1 ♀, Yinchuan, under light,

6.vi.1960 ( SYSU); 1 J, Yinchuan, under light, 15.vii.1962 ( SYSU); 1

J, Yinchuan, Gujiaqiao, 23.vi.2011 ( SYSU); 2 ♀♀, Yinchuan ( SYSU). TIANJIN: 1 ♀, Tsing tou, 17.viii.1933 ( SYSU); 1 J, Tientsin, 10.iv.1935 ( SYSU); 1♀, Tianjin, Balitai, 4.v.1955,Y.Y.Liu leg. ( SYSU). WITHOUT ඉRECISE DATA: 15 spec., donated by Xing-min Wang, purchased from market, without data ( SYSU); 1 J, China ( LHCM).

Diagnosis. TL 35–40 mm, elongate, oblong-oval ( Fig. 2A View Fig ). Head dark green, clypeus yellow. Pronotum and elytra dark green to black, with distinct yellow margins laterally. Ventral surface yellow; prosternal process, middle of metaventrite and metacoxae dark green; metacoxae and abdominal ventrites narrowly margined ( Fig. 2B View Fig ). Dorsal surface dimorphic: smooth with sparse fine punctures in male; in female with isolated short, irregular striae on pronotum, and with dense longitudinal striae of various lengths on elytra except at its apex. Prosternal process lanceolate, with distinct lateral bead, surface flat, apex pointed; lateral parts of metaventrite (ʻmetasternal wingsʼ) 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 brown; protarsomeres 1–3 of male broadly expanded into a palette, with four rows of adhesive setae on their ventral side; metatarsal claws single in both sexes. Median lobe of aedeagus ʻCʼ- shaped in lateral view, moderately curved ( Fig. 2C View Fig ); ridged in middle in ventral view, lateral margin strongly curved near apex, apex obtuse-angled ( Fig. 2D View Fig ). Parameres moderately broad, strap-like apically ( Fig. 2E View Fig ).

Habitat. This species inhabits ponds, paddy fields and wetlands with aquatic plants ( MORI & KITAYAMA 1993); specimens from Shanxi were found in a natural lake ( Figs 18A–C View Fig ).

Distribution. China (Beijing, Fujian, Guangdong, Hainan, Hebei, Heilongjiang, Jilin, Liaoning, Ningxia, Sichuan, Shaanxi, Shandong, Shanxi, Taiwan, Tianjin) ( Fig. 20A View Fig ), Japan, North Korea, Russia, South Korea (RḖGIMBART 1899; ZIMMERMANN 1920; FENG 1932, 1933b;

GSCHWENDTNER 1938; ZAITZEV 1972; ZENG 1989; MORI & KITAYAMA 1993; NILSSON 1995; NILSSON & HáJEK 2022b).