Hydrovatus rufoniger rufoniger ( Clark, 1863 )

Hendrich, Lars & Balke, Michael, 2004, Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #, Raffles Bulletin of Zoology 52 (1), pp. 97-145 : 115

Hydrovatus rufoniger rufoniger ( Clark, 1863)

( Fig. 20 )

Hyphidrus [sic!] rufoniger Clark, 1863: 423 .

Hydrovatus rufoniger rufoniger (Clark) - Biström, 1996: 388, and references therein; Balke et al., 1999: 325; Nilsson, 2001: 198.

Material examined. – Number? - „ Singapour “ after Régimbart (1899) ( Biström 1996). Not seen.- 57 specimens - Central catchment area - 10 ex., Nee Soon Swamp Forest , 16 May.1992, coll. C. M. Yang ( ZRC) ; 3 ex., Nee Soon Swamp Forest , 6 Dec.1996, coll. L. Hendrich ( CBH, ZRC) ; 1 ex., Nee Soon Swamp Forest , 20 Sep.1993, y 843, coll. Yang ( ZRC) ; 41 ex., Nee Soon Swamp Forest , 21 Apr.1997, coll. Balke & Hendrich ( CBH) . Sungai Buloh - 1 ex., Nature Park , 5 Dec.1996, coll. L. Hendrich & A. Wong ( ZRC) .

Distribution. – India, Bangla Desh, Sri Lanka, Myanmar, China, Thailand, Cambodia, West Malaysia, Singapore, Indonesia: Sumatra, Java, Ceram, New Guinea ( Biström, 1996, Balke et al., 1999).

Ecology. – Hydrovatus rufoniger rufoniger inhabits shallow, gloomy water of open swamps, artificial ponds (e.g., fish ponds, paddy fields), and slow flowing drainage ditches. The habitat must be rich in rotten leaves, submerged plants, and dense stands of sedges. The species is also attracted to light ( Biström 1996).

Figures

Figs. 18-23. 18.Hydaticus fabricii (MacLeay, 1825) (Fam. Dytiscidae, 10.5 mm); 19. Leiodytes nicobaricus (Redtenbacher, 1867) (Fam. Dytiscidae, 2.1 mm); 20. Hydrovatus rufoniger rufoniger (Clark, 1863) (Fam. Dytiscidae, 3.6 mm); 21. Laccophilus medialis Sharp, 1882 (Fam. Dytiscidae, 3.3 mm); 22. Copelatus minutissimus Balfour-Browne, 1939 (Fam. Dytiscidae, 4.1 mm); 23. Eretes griseus (Fabricius, 1781) (Fam. Dytiscidae, 13.5 mm).