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.