|Found in Asia: China,
Indonesia, India, Cambodia, Myanmar, Malaysia, Philippines, Peninsular
Malaysia, Thailand, Viet Nam
|Sub-Order: ANISOPTERA||Super-Family: LIBELLULOIDEA||Family: LIBELLULIDAE|
Identification Guide to Brachydiplax
The 6th image is difficult to decide between Brachydiplax chalybea and Raphismia bispina
Brachydiplax chalybea is common in Tawau. But Raphismia bispina I have never seen on in Tawau yet.
|1 Though a widespread species, the female of
Brachydiplax chalybea is seldom seen. The brownish female only
appears to mate and oviposite in the afternoon after which back to
the hiding bush again.
|2 The brownish female is completely different in
color to the powder blue of the male. I would not be sure this is a
Brachydiplax chalybea if not I spotted them in a pair earlier ( The
blue male being immediately recognize). The mating time is only few
seconds after which the female oviposit alone.
|3 A sticky egg mass in segment 9 surrounded by
jelly . Brachydiplax chalybea’s egg is pale blue in color. Eggs of
most other dragonfly species are yellowish.
Female dragonflies produce a sticky substance surrounds the eggs. The sticky substance keeps the eggs together and holds the eggs to an anchor to the plants in the water.
|4 Wing venation of a female. Both wings are clear
with tinted brown at the base.
Brachydiplax chalybea is a moderate sized dragonfly commonly
found in unshaded body of water, such as ponds, stagnant or slow flowing streams
and drains. The males are a powder-blue in colour with hindwings that are tinted
brown at the base and are often seen perched by the water and every now and then
flying out to challenge any intruder that wanders into their small territory.
Brachydiplax chalybea is powder blue of moderate size. The hindwing is clearly tinted brownish-yellow at the base. It is a common dragonfly most frequently encountered species of Anisoptera in lowland Borneo, found on virtually any open body of standing or slowly flowing water including artificial drains and dams. It is commonly encountered at the landward margins of mangroves. Typically males establish small territories of a few square metres, and contests are frequent and protracted especially in the latter part of the morning. Mating and oviposition occur in the afternoon.
Males pale to mid powder blue. Females
have shades of brown.
Like most Libellulids they tend to perch on sticks, reeds or stones near water, flying out to catch insects then returning to their perch