The species is a heavy built
damselfly, and it is one of the biggest zygopteran. The body is variable from
dark green to copper and there are pruinose patches on the synthorax and the
abdomen. Their wings are hyaline with smoky patch at base. In the mature forms,
the wings somehow to be light orange and look dust. Male and female are not
dimorphism so they look similar and female is distinct with her robust abdomen.
They live in open clear and
swift streams of secondary forests of high land in the North of the country
with elevation over 700m. Mature forms do not fly far from their breeding
habitats and the male keeps his territory even in rain. Individuals of both
sexes perch not so high above of the water surface, usually they rest on rocks
or water plants near the flowing water.
Male just above the water, photographed by Cuong Do, Lao Cai Province
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