Hydaticus bipunctatus conjungens Régimbart, 1899

Hendrich, Lars & Balke, Michael, 2004, Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #, Raffles Bulletin of Zoology 52 (1), pp. 97-145 : 119

Hydaticus bipunctatus conjungens Régimbart, 1899

( Fig. 17 )

Hydaticus bipunctatus Wehncke, 1876: 196 . Hydaticus vittatus var. conjungens Régimbart, 1899: 329 . Hydaticus bipunctatus conjungens Régimbart - Wewalka, 1975: 94,

and references therein; Hendrich & Balke, 1995: 46; Balke &

Hendrich, 1999: 16; Balke et al., 1999: 325; Nilsson, 2001: 100.

Material examined. – 10 specimens - Central catchment area - 1 ex., Nee Soon Swamp Forest , Shelter near Range II U. May light trap, 22 May.1992, NS 10D, coll. C.Y. Chang ( ZRC) . Bukit Timah - 7 ex., Nature Reserve , 13 Dec.1995, NS 214, coll. T. Wong, H. K. Lua et al. ( ZRC) . Other areas – 1 ex., Lorong Banir , pond 2, 14 Jul.1995, NS 198, coll. H. K. Lua ( ZRC) ; 1 ex., Lorong Banir , pond 1, 28 Apr.1997, coll. M. Balke, L. Hendrich & C. M. Yang ( CBH) .

Distribution. – Indonesia [Sunda Islands] ( Wewalka, 1975; Hendrich & Balke, 1995), Singapore (Balke & Hendrich, 1999; Balke et al., 1999).

Ecology. – Hydaticus bipunctatus inhabits various types of more permanent, eutrophic standing waters such as ponds, paddy fields, fish ponds, lakeshores and drainage ditches (Hendrich & Balke, 1995). The habitat should be rich in detritus and submerged vegetation. The species is also collected under lighted conditions (Hendrich pers. observ. on Bali, Indonesia) .

Figures

Figs. 15-17.15. Microdytes elgae Hendrich, Balke & Wewalka, 1995 (Fam. Dytiscidae, 2.0 mm); 16. Lacconectus corayi Brancucci, 1986 (Fam. Dytiscidae, 3.7 mm); 17. Hydaticus bipunctatus conjungens Régimbart, 1899 (Fam. Dytiscidae, 13.4 mm).