Photos and discussions on dragonflies and damselflies of Vietnam
Monday, 2 December 2013
Aciagrion migratum - no Prodasineura after all
On December 1 in Huu Lien I noticed a thin damsel hovering over the stream like Prodasineura autumnalis tends to do. At first I therefore suggested it might be something similar, but Rory Dow pointed out it had to be a Coenagrionid (thanks Rory) related to Ischnura, on behalf of the spine on the sternum of S8. That pointed me to Aciagrion and then I remembered that Aciagrion migratum passes through the winter as imago, but only gets its blueish color in spring. How exciting, the second record for Vietnam, but undoubtedly it is just under recorded.
Aciagrion migratum, female winter type
The same female
And in hand
Close-up of the ovipositor and S8, showing clearly the apical spine on the sternum