Family: Libellulidae
Genus: Tetrathemis

Tetrathemis irregularis
inhabits rainforest streams

 

Found in China, Indonesia, Malaysia, Peninsular Malaysia, Thailand
Genus : Tetrathemis Super-Family: LIBELLULOIDEA Family: LIBELLULIDAE

Tetrathemis irregularis

 

Tetrathemis irregularis inhabits rainforest streams
♂26mm

 

2016-10-16 BANDAR SRI INDAH
 


 

The vibrant and attractive colors of the  eyes of a dragonfly

Tetrathemis irregularis have relatively very large compound eyes among dragonflies.

An compound eye of a dragonfly cover most part of the head and each containing up to 30,000 facets

There are two different shapes in the dragonfly's eye surface hexagonal and quadrilateral.


The pair of big eyes covers almost 2/3 of the head.
Tetrathemis irregularis’s eyes are the most colorful and brilliant in the family. This image does not fully capture the beauty of her eyes.

Wings of a female Tetrathemis irregularis.

Open wing venation with no anal loop on hind wing. Clear wing similar to that of a male except this female has some tan at the wing base.

The same female view from top.

While the thorax marking are similar, the male and female have a different physical appearance on the abdomen. Male is slim and female is fat.

Female Tetrathemis irregularis thorax marking is similar to male. Thorax metallic black with 3 yellow stripes.

This female was found roosting in low bush. 100m from the bush is the mountain stream where 3 different males were photographed in June and July the same year.


Tetrathemis irregularis is one of the small size dragonfly in Sabah.

Compare with other small dragonflies, Tetrathemis irregularis has a more robust thorax and faster speed in flight.

Left pair of clear wings of a male Tetrathemis irregularis with simple vain line system.

Strikingly brilliant blue/green eyes of a male Tetrathemis irregularis

This small dragonfly has a hind wing span of 44mm.

Body length is only 28mm, Abdomen is 18mm

Tetrathemis irregularis  It is common and  widespread in lowland swamp forest and sluggish forest streams, particularly in more disturbed areas. Males guard tiny pools and remain perched on station for most of the day.

It is a common local inhabitant of peat swamp and alluvial forest, hovering over tiny ponds in shafts of sunlight penetrating the canopy.

Tetrathemis irregularis has a pair of strikingly brilliant greenish blue eyes


This one is a male.

This lonely males is guarding beside a mountain running stream for most of the day.  As a male has responsibility to guide his territory, he has to stand on top position to keep en eye on intruder.

He share his water territory with   Neurothemis fluctuans  (Fabricius, 1793) and damselflies Agriocnemis femina oryzae and Rhinocypha humeralis


 

INDEX OF DRAGONFLY

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