|Orthetrum glaucum (Brauer, 1865)
is an Asian dragonfly species, common across much of tropical and subtropical
Asia, and capable of thriving in disturbed habitats. It breeds in ponds,
drains, ditches and other open lentic habitats. The common name for this
species is Blue Marsh Hawk.
Orthetrum glaucum is a large size
blue dragonfly species. It looks alike O. triangulare. However, it is more
common than O. triangulare although both O. glaucum and O. triangulare
triangulare are widespread. O. glaucum can be distinguished from O. triangulare
triangulare by the smaller patch of dark amber at the base of the hind
wing and narrower abdomen in both sexes. For mature male, the black tip
of the abdomen is less extensive in O. glaucum (usually not beyond the
8th abdomenal segment) than in O. triangulare triangulare. The color of
the thorax of male O. glaucum becomes pruinosed pale blue with age while
that of O. triangulare triangulare is black. As the color of both male
and female of these species vary with age, it may be hard to distinguish
them by color alone. Besides, subadult male and female of these species
also look similar.
The male is a fairly big dragonfly
that once fully mature becomes pruinosed (a bit like the felt-look of a
peach). It is almost entirely blue. They are quite easily scared, but seem
to get used to your presence after a while and allow you to get closer.
The eyes of the male are grey/blue.
Orthetrum glaucum is a widespread
species distributed throughout tropical and subtropical Asia and south
and east to New Guinea. It is assessed by IUCN Red List as Least Concern.