Thursday, March 5, 2015

20. Brachydiplax sobrina (Rambur, 1842)

 Brachydiplax sobrina (Rambur, 1842)

Number: 20
Family: Libellulidae
Genus: Brachydiplax 
Species: Bracydiplax sobrina (Rambur, 1842)
Common name: Little Blue Marsh Hawk  
Habitat: Lakes, Ponds, Forest patches 
Distribution: Sylhet, Chittagong, Dhaka
Abundance: Common 
Flight Season: February - December

                                                          The male

The juvenile male is yellow and black in color. The male is dorsally black with yellow lateral spots. 

Dorsal view of Brachydiplax sobrina young male

As the male become mature, it starts to change its color, particularly the color of abdominal segments 3-6 starts to transform into whitish. Segments 7-9 has lateral yellow spots anal appendages black. 

Lateral view of Brachydiplax sobrina, immature male
As male become more mature the segments 3-6 turn into bluish and the 7-10 turn into black.

The fully mature male is black and white in color. The thorax is pruinosed, abdominal segments 1-6 are white, 7-10 are black in color.   

Brachydiplax species is confusing B. sobrina is often confused with B. farinosa. B. sobrina can be identified by counting the presence of 7 antenodal veins which is 8 or more in B. farinosa.


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