This is quite common Asian species and is one of the earliest known
species of dragonfly. It was named by Linnae based on a picture in book cover
of bird. And because in the picture the specimen was drawn with the wings in
horizontal position, this species formerly was put in Anisoptera suborder by
Linnae. Name of species is specified its locality, from China
The medium sized damselfly, this species has shining green body and
hind-wing is metallic green. The head, thorax and abdomen of the male are
metallic green while female has fader green body. The wings of the male
distinguish from them of the female. Female’s fore-wing has a white spot at
pterosigma position – psedopterostigma, while male’s fore-wings are dust
yellowish hyaline and instead of psedopterostigma, there is a white spot at
nodus position. The hind-wings of female are shinning colorful, metallic green
with an apical black patch on upper side and they are quite dust yellowish
hyaline in female.
They are very active damselflies, and live at open swift streams from
low to high lands. They never fly far from their breeding habitat; males are
strict in territorial defense by showing their flash metallic green hind-wings.
Males fly very close to the water surface while females usually perch on
vegetations nearby. In courtship flying, males usually keep the hind-wing open
in horizontal position to show the flash green upper surface of the wings under
sunshine. Sometime males just clap their hind-wings as resting and the action is
signal to other males in territorial informing or to coming females for mating. Females insert their eggs into aqua vegetation
tissue; in many cases, female sinks in the water during the oviposition while
the male around.
Male, photographed by Cuong Do, Ba Vi
Male, photographed by Cuong Do, Pioac Nature Reserve, Cao Bang Province
Male, showing his hind wing in opened position, photographed by Cuong Do, Hon Ba Nature Reserve, Khanh Hoa Province
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