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 Orectochilus (Patrus) andamanicus Régimbart, 1884 Orectochilus andamanicus Régimbart, 1884: 435 ; Ochs, 1929: 403 ; Balke et al., 1999: 326. Material examined. – 8 specimens - Central catchment area - 2 ex. , Seletar Reservoir , 16 May.1994 , NS 134c, coll. H. K. Lua ( ZRC ) ; 3 ex. , Nee Soon Swamp Forest , 14 Jun.1994 ( ZRC ) ; 2 ex, Chestnut Drive , 9 Jun.1994 ( ZRC ) ; 1 ex. , Seletar Stream , May.1991 ( ZRC ) . Distribution. – India , Andaman Islands, Myanmar , Thailand , West Malaysia ( Ochs, 1929 and Mazzoldi, in litt.), Singapore (Balke et al., 1999). Ecology. – In Singapore specimens were collected in clear and well shaded streams. Orectochilus andamanicus is a rare whirligig and belongs to a group of species ( O. spiniger - group) which occur in shaded clearwater streams, mainly in forested areas of the lowlands. The beetles usually circle under fallen logs and in undercut riverbanks (Mazzoldi, in litt.).