Chasmogenus abnormalis ( Sharp, 1890 )

Hendrich, Lars & Balke, Michael, 2004, Aquatic Coleoptera Of Singapore: Species Richness, Ecology And Conservation #, Raffles Bulletin of Zoology 52 (1), pp. 97-145 : 126

Chasmogenus abnormalis ( Sharp, 1890)

Philydrus abnormalis Sharp, 1890: 351 .

Helochares abnormalis ( Sharp, 1890) - Fernando, 1961: 23; 1964: 87.

Chasmogenus abnormalis ( Sharp,1890) - Hebauer, 1992: 68; Hansen, 1999: 174, and references therein.

Material examined. – 5 specimens – Central catchment area - 1 ex., Nee Soon Swamp Forest , Fluorescent Light trap, 1930 – 2130 hrs., 22 May.1992 ( ZRC) ; 2 ex., Lower Pierce Forest , H.R. Light trap, 2130-2330 hrs., 4 Jun.1992 ( ZRC) ; 2 ex., Lower Peirce Reservoir , after the concrete water runoff, 22 Apr.1997, 230a, coll. H. K. Lua ( ZRC) .

Distribution. – The most widespread species of the genus in the Oriental region. Sri Lanka, Thailand, Vietnam, Cambodia, West Malaysia, Indonesia [Java, Sumatra, Sulawesi,

Kalimantan], Philippines [Luzon], Taiwan and Japan ( Hebauer, 1992; Hansen, 1999). Singapore!

Ecology. – Some of our specimens were collected under lighted conditions. Like other species of the genus (Hendrich pers. observ.) it is most probably a lentic species, living in very shallow water at the edge of semi-shaded forest pools and puddles. The species has already been recorded from a light trap ( Fernando, 1961).