Monday, March 23, 2015

25. Onychrgia atrocyana (Selys, 1865)

Onychrgia atrocyana (Selys, 1865)

Number: 25
Family: Platycnemididae
Genus: Onychrgia  
Species: Onychrgia atrocyana (Selys, 1865)
Common name: Black Marsh dart
Habitat: Lakes, ponds, forest patches
Distribution: Dhaka, Sylhet
Abundance: Common 
Flight season: March- November


Most of the damselflies of Bangladesh are very colorful, particularly the males. However, unlike many other damselflies Onychrgia atrocyana are black in color. But this unique color has makes it distinct from the other species.  

The juvenile are are like females and can be distinguished from the mature male by the presence of yellow antehumeral stripe.

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