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

                                                                 Male

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.