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 Hydaticus ? concolor Sharp, 1882 Hydaticus concolor Sharp, 1882: 662 ; Régimbart, 1899: 327 ; Zimmermann, 1920: 219 ; 1927: 6 ; Vazirani, 1977: 76 ; Wewalka, 1979: 135 ; Nilsson, 2001: 101 . Material examined. – 1 specimen – Other areas - 1 female , Lorong Banir , pond 1, 16 Jun.1990 , NS 190, coll. Lua et al. ( ZRC ) . Ecology. – Unknown. Probably a freshwater swamp forest species like H. reductus . Remarks. – Hydaticus concolor and other species such as Hydaticus sexguttatus Sharp, 1882 and H. reductus Régimbart, 1899 form an assemblage of small, comparably dark species that remain to be revised. Our specimens were compared with identified beetles in CGW and MNHN. Hydaticus concolor is recorded from Vietnam , Indonesia ( Vazirani, 1977 ; Wewalka, 1979 ). If the determination is correct it will be the first record for the Malaysian Peninsula and Singapore .