Aphelocheirus grik D. Polhemus & J. Polhemus, 1989: 218 Guide To The Aquatic Heteroptera Of Singapore And Peninsular Malaysia. Xi. Infraorder Nepomorpha- Families Naucoridae And Aphelocheiridae Polhemus, Dan A. Polhemus, John T. Raffles Bulletin of Zoology 2013 2013-08-30 61 2 665 686 7QYLB D. Polhemus & J. Polhemus, 1989 D. Polhemus & J. Polhemus 1989 Insecta Aphelocheiridae Aphelocheirus Animalia Hemiptera 17 682 Arthropoda species grik Aphelocheirus  ( Figs. 47–52)    Aphelocheirus grikD. Polhemus & J. Polhemus, 1989: 218    Material examined.—  MALAYSIA,  Perak: 50 brachypterous males, 50 brachypterous females, Kerunai River, 9 kmN. of Grik,  135 m, 5°30'53"N, 101°07'50'E,  19 Aug.1985, CL 2078, D. A. & J. T.  Polhemuscoll. ( paratypes, JTPC); 6 brachypterous males, 6 brachypterous females, stream 58 kmS. of Grik,  19 Aug.1985, CL 2077, D. A. & J. T.  Polhemuscoll. ( paratypes, JTPC); 1 female,  Gerik[Grik],  17 Feb.1997, LHK324, coll. H. K. Luacoll. ( ZRC).    Diagnosis.— Brachypterous forms with length 7.2–7.7 mm, maximum width (across abdomen) 4.8–5.0 mm ( Fig. 47); macropterous forms with length 7.9–8.3 mm, maximum width (across abdomen) 4.9–5.1 mm( Fig. 48). Colouration of brachypterous forms uniformly blackish to brownish, with head dark yellow; colouration of macropterous forms entirely dark brown. This species may be immediately recognised by its relatively small size, the short, truncate female subgenital plate ( Fig. 50), the projecting tab on the posterior margin of abdominal sternite V in the male ( Fig. 49), and the male genitalic structures ( Fig. 51).    Distribution.— Described from peninsular Malaysia( Perak), with paratypesfrom additional Malaysian localities in that state, and from northern Thailand( Chiang Mai Province).    Discussion.—  Aphelocheirus grikis the smallest of the species in the subgenus  Aphelocheirusknown to occur in Peninsular Malaysia, and may be quickly recognised by the distinctive ventral abdominal characters of both males and females as noted in the diagnosis. Brachypterous specimens of  A. grikexhibit two distinct colour morphs, with some individuals brown, and others black, in each case with the head dark yellow. The macropterous forms also have a distinctive texture on the hemelytral corium consisting of small, raised, shiny dots on an otherwise dull background. 1985-08-19 T Malaysia 135 5.5147223 Grik Kerunai River 17 682 1 Perak 1985-08-19 JTPC, T Polhemus Malaysia Grik 17 682 1 Perak paratype [1015,1448,1533,1556] JTPC Polhemus Malaysia 17 682 1 1 Perak paratype [812,1448,1561,1584] 1997-02-17 ZRC H. K. Lua Malaysia Gerik 17 682 1 Perak paratype