Family Coenagrionidae

Male Onychargia atrocyana (Selys, 1865) 藍彩琵蟌
This is the only species in Borneo

藍彩琵蟌 Onychargia atrocyana

Wing of a male Elattoneura coomansi

Wing of a male Onychargia atrocyana

♂30mm

2017-05-22 WHITE BRIDGE
Front wing of a male Elattoneura coomansi of Borneo
Front wing of a male Onychargia atrocyana of Borneo
 

 

Front wing length 19mm
Body length 31mm
The secondary genitalia of a male Elattoneura coomansi damselfly. The secondary genitalia of a male Onychargia atrocyana damselfly.

The secondary genitalia on the undersides of segments two and three and are conspicuous.

♂30mm

 		 View from bottom of the last 3 segments. When view from the bottom, the male anal appendages are similar to others species in the same family.
 
When view from the top, there seem to be 3rd pair of unusual appendages on the very top of the last segment. (Unfortunately I did not have another clearer image for verification)
 

Ventral view of a male Elattoneura coomansi in Borneo

Ventral view of a male Onychargia atrocyana in Borneo
 

♂31mm
 2017-05-21 SUN WHITE BRIDGE

 


 

FACE OF A MALE Onychargia atrocyana damselfly.
 of Borneo Island

The following are three different individual Onychargia atrocyana from the same location.
A matured male Elattoneura coomansi. ♂30mm

Another matured male Onychargia atrocyana.
2007-09-09 WHITE BRIDGE

Elattoneura coomansi		 This is the most hairy damselfly ever seen.

What are the function of long hairs on the head?

There are two possible function :
1) To conserve heat.
2) Act as sensors of wind and air current.

♂30mm
An young male Elattoneura coomansi.  

An young male Onychargia atrocyana.
2007-08-12 WHITE BRIDGE

 

Elattoneura coomansiAn old male Elattoneura coomansi.
 		 ♂

 

Onychargia atrocyana both found on the same location at WHITE BRIDGE in Sabah.
 
The whole damselfly is pure black with metallic deep blue on the upper part of thorax. Abdomen fine and thin but the throex is robust build.
 
While other damselfly are colorful, the unique pure shinning black color make this young male looks more like a precious jewelry. Under direct sunlight the top of the 2 eyes shin with metallic blue.
 

Other blue damselflies of Sabah :

INDEX : Damselfly     June 12, 2017 06:59:59 PM