Libellulidae - Orthetrum triangulare

Orthetrum traingulare is a medium to large size dragonfly species. It is categorized as highland species (altitudinal distribution 500-1500 m) in Peninsular Malaysia. I spotted quite a good number of them in Cameron Highlands. O. triangulare is always confused with O. glaucum as both have blue marking. However, O. triangulare is distinguishable from O. glaucum by having distinctive triangular patch on the base of hingwing.

Chlorocyphidae - Heliocypha biforata

Heliocypha biforata is a beautiful damselfly species. It looks alike H. perforata, yet both the species could be distinguished easily. H. biforata has more intensive pink marking on its dorsal thorax and less obvious blue marking on its abdomen compared to H. perforata. H. biforata and H. perforata share similar habitat (fast flowing forest stream) and have similar behaviour (pearching on logs and rock along the stream).

Chlorocyphidae - Heliocypha perforata

Heliocypha perforata is a elegant damselfly species. The blue markings on its thorax and abdomen are distinctive. It is normally found at fast flowing forest streams. It likes to pearch on logs and rock under along the stream.