First Inventory Of The Water Bugs (Heteroptera: Nepomorpha: Gerromorpha) Of Langkawi Island, Kedah, Malaysia Author Zettel, Herbert Author Tran, A. D. text Raffles Bulletin of Zoology 2009 2009-08-31 57 2 279 295 journal article 10.5281/zenodo.5342032 2345-7600 5342032 Rheumatogonus intermedius Hungerford, 1933 Material examined. – (all apterous): Datei environment: 1 female , HP1; Air Tejun: 3 males , 2 females , HZL10 ; 5 males , 4 females , TAD0623 . Distribution. – Southern Thailand , West Malaysia , and Sumatra ( Chen & Nieser, 2002 ).