Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation # Author Hendrich, Lars Author Balke, Michael text Raffles Bulletin of Zoology 2004 52 1 97 145 journal article 10.5281/zenodo.13244881 2345-7600 13244881 Hydrovatus pudicus ( Clark, 1863 ) Hydroporus pudicus Clark, 1863: 426 ; Sharp, 1882: 807 . Hydrovatus pudicus (Clark) - Hendrich & Balke, 1995: 36; Biström, 1996: 314 , and references therein; Balke et al., 1999: 325; Nilsson, 2001: 200 . Material examined. – 20 specimens - 5 ex. , “ Singapore ” (without additional data), det. J. Balfour-Browne ( BMNH ) ( Biström 1996 ) . Central catchment area - 6 ex. , Nee Soon Swamp Forest , 7 Sep.1991 , coll. H. K. Lua ( ZRC ) ; 1 ex. , idem, 20 Sep.1993 , y 843, coll. K. L. Yeo ( ZRC ) ; 2 ex. , idem, 26 Apr.1997 , coll. M. Balke & L. Hendrich ( CBH ) . Other areas - 3 ex. , Bukit Batok Nature Park , pond 2, 23 Apr.1997 , coll. M. Balke , L. Hendrich & H. K. Lua ( CBH ) ; 3 ex. , Bukit Batok Nature Park , large quarry, 23 Apr.1997 , coll. M. Balke , L. Hendrich & H. K. Lua ( CBH ) . Distribution. – Myanmar , Thailand , Laos , West Malaysia , Singapore , Indonesia : Sumatra , Java , Bali , and the Philippines (Hendrich & Balke, 1995; Biström, 1996 ; Balke et al., 1999). Ecology. – Hydrovatus pudicus is an inhabitant of shallow, muddy water of open swamps, at the edge of artificial ponds (e.g., fish ponds, paddy fields), and in slow flowing drainage ditches. The habitat is rich in rotten leaves, submerged plants, and dense stands of sedges (Hendrich & Balke, 1995; Biström, 1996 ).