Hydaticus fabricii ( MacLeay, 1825 )

Hendrich, Lars & Balke, Michael, 2004, Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #, Raffles Bulletin of Zoology 52 (1), pp. 97-145 : 120

Hydaticus fabricii ( MacLeay, 1825)

( Fig. 18 )

Colymbetes fabricii MacLeay, 1825: 134 . Hydaticus fabricii ( MacLeay, 1825) - Fernando, 1961: 19, 24; 1964:

87; Wewalka, 1979: 121, and references therein; Yano et al.,

1983a: 17; Hendrich & Balke, 1995: 46; Nilsson, 2001: 101; Hydaticus sp. : Yang, 1991: 93.

Material examined. – 19 specimens - Central catchment area - 1 ex., Nee Soon Swamp Forest , slow flowing stream, 21 Jan.1992, y 844, coll. C. M. Yang ( ZRC) ; 2 ex., Nee Soon Swamp Forest , 9 May.1992, 795D, coll. K. L. Yeo et al. ( ZRC) . Bukit Timah - 3 ex., Nature Reserve , 13 Dec.1995, NS 214, coll. H. K. Lua et al. ( ZRC) . Sungai Buloh – 1 ex., Sungai Buloh , 4 Dec.1990, coll. C. M. Yang & K. L. Yeo ( ZRC) ; 2 ex., Nature Park , mudpool, 4 Dec.1990, ZRC 6.3812, coll. C. M. Yang & K. L. Yeo ( ZRC) ; 1 ex., Nature Park , 15 May.1991, ZRC 6.3813, coll. C. M. Yang & K. L. Yeo ( ZRC) ; 4 ex., Nature Park, Mangrove Swamp Forest , 30 Jan.1992, y 776, coll. T.B. Lim ( ZRC) . Other areas - 1 ex., Kent Ridge Park , pond, 20 Jan.1992, coll. W.H.J. Yong ( ZRC) ; 2 ex., Warwick Road , 13 Nov.1998, Y 929, coll. K. L. Yeo ( ZRC) ; 1 ex., Lorong Banir , pond 1, 16 Jun.1995, NS 190, coll. H. K. Lua & C. M. Yang ( ZRC) .

Distribution. – India, Indonesia [Bali, Java, Kalimantan, Sumatra, Sumba], Laos, Malaysia [West Malaysia, Sarawak], Thailand ( Wewalka, 1979; Hendrich & Balke, 1995). Singapore!

Ecology. – The species prefers various types of exposed, permanent, eutrophic standing waters such as ponds, paddy fields, fish ponds, shallow lakes and slow flowing ditches. The habitat is rich in detritus and submerged vegetation. Hydaticus fabricii is often collected under lighted conditions ( Fernando, 1961).

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).