Cybister fumatus Sharp, 1882

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 : 79-80

Cybister fumatus Sharp, 1882

( Figs 3A–E ; 20A )

Cybister fumatus Sharp, 1882: 731 (orig. descr.); FENG (1936): 13 (Shanghai).

Material examined. None from China but 9 specimens from LAOS: 4 spec., Kham Mouan prov., Ban Khoun Ngeun, 18°07′N 104°29′E, 200 m, 19.–31.v.2001, P. Pachol á tko leg. ( NHMB, LHCM); 1 spec., Vientiane prov., Phou Khao Khouay, 18°20.369′N 102°48.523′E, nr. strongly disturbed primary rainforest on light, 25.–30.v.2008, A. Solodovnikov & J. Pedersen leg. ( ZMUC); 1 spec., Sekong Prov., Tad Faek waterfalls, 15°14.7′N 106°42.1′E, 118 m, light trap, 8.v.2010, J. Hájek leg.( NMPC); 1 spec., Bolikhamsay prov., Nam Kading NPA research center near Ban Phone Kham, 18°20′N 104°08′E, 250 m, 23.–29.v.2011, NHMB Basel Laos 2011 Expedition M. Brancucci, M. Geiser, D. Hauck, Z. Kraus, A. Phantala & E. Vongphachan ( NHMB); 1 spec., Bolikhamsay prov., Pakkading Ban Phone Kham env. 18°19′N 104°08′E 200–300 m, 23.–29.v.2011, NHMB Basel Laos 2011 Expedition M. Brancucci, M. Geiser, D. Hauck, Z. Kraus, A. Phantala & E. Vongphachan ( NHMB); 1 spec., Savannakhet prov., 10 E of Savannakhet, Dong Natad forest, 180 m, 4.xii.2011, J. Šťastný leg. ( JSCL).

Diagnosis. TL 22–24 mm, elongate, oblong-oval ( Fig. 3A ). Head dark green, clypeus yellow. Pronotum and elytra dark green, with distinct yellow margins laterally; apex of yellow margin on elytra slightly hooked. Ventral surface black; with lateral part of metaventrite and metacoxae yellow; abdominal ventrites III–V with a pale spot on each side ( Fig. 3B ). 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 reddish-brown, midlegs and hindlegs reddish-brown to black; 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. 3C ); gradually narrowed from base to near apex in ventral view, apex furcate, with a deep acute-angled notch medially, lateral margins of apex straight and parallel ( Fig. 3D ). Parameres moderately broad, approximately the same width apically ( Fig. 3E ).

Habitat. In Laos all specimens were collected at lower altitudes between 180 and 300 m above sea level. The specimen from Sekong was attracted by a light trap placed near the border of a lowland river. The single specimen from Dong Natad was collected in a shallow swamp in lowland monsoon primary forest, associated with Hyphydrus lyratus (Swartz, 1808) , Hyphydrus sp. and Lacconectus sp. For habitat photos see HENDRICH & BRANCUCCI (2013).

Distribution. China (Shanghai) ( Fig. 20A ), Indonesia, Laos, Malaysia, Thailand, Vietnam (RḖGIMBART 1899, ZIMMERMANN 1920, FENG 1936, NILSSON 1995, HENDRICH & BRANCUCCI 2013).

Figures

Fig. 3. Cybister fumatus Sharp, 1882 (J♀, Laos). 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).

Fig. 20. Map of distribution of Cybister in China.