Sunday, June 16, 2013

160. Burmagomphus asahinai (Kosterin, Makbun & Dawrueng, 2012)

Number: 160
Family: Gomphidae
Genus: Burmagomphus
Species: Burmagomphus asahinai
Common name(s): N/A
Synonyms: N/A
Habitat: Uplands stream
Province(s) sighted: Nr. Sum Bon Ranger Station, Nam Nao National Park (Petchabun)
Sightings (by me): Extremely Rare
In flight (that I have seen): June (2013)
Species easily confused with: Burmagomphus divaricatus

Yesterday, I returned to Nam Nao NP in the hope of finding something new for my personal records ... even a provincial record, maybe. As I waded through a shallow, but rocky stream, I noticed a small Gomphidae obilisking in the hot sun. As I carefully approached, another slightly larger Gomphidae dropped onto it and a battle ensued. Both flew away ... you could say I was a bit p****d off to say the least. I carried on and eventually at a long flat area of rock surface in the middle of the stream, I saw 2 more males of the same species soaking up the sun. This time I managed to photograph them pretty well  in blinding sunshine and thought that they were Burmagomphus divaricatus. It was only when I got home and looked through my photos more carefully that I noticed that it had slightly different thoracic markings to those I saw in Nam Nao town (about 60-70 kms away) and at Khao Yai - both other places were large, open streams. This was small and rocky. Anyway, I posted a few photos on Dragonflies of Thailand Group (Facebook) and it was comfirmed as Burmagomphus asahinai, a species recently described by three people who I don't have any idea who they are ... hahaha Seriously, though, both Noppadon Makbun and Pattarawich Dawrueng comfirmed this species and Pattarawich also said it was a provincial record ... so I think I can safely say that this is correct. Many thanks to those mentioned as well as everyone else who contributes on the Dragonflies of Thailand Group (Facebook). Without you, as well as Oleg Kosterin, I wouldn't be able to differentiate between Burmagomphus asahinai and Diplacodes trivialis haha

The male
The male is difficult to differentiate between the other species in the genus. The thoracic markings are probably the most obviously difference, though still subtle.  The only thing I can suggest is, always take photos of Gomphidae ... it's not as if you see them everyday anyway. and you may record a new species for yourself!

Male appendages
The male appendages differ slightly to those of Burmagomphus divaricatus (click on link to see entry) - they seem slightly thicker and more curved than those of B. divaricatus. Not the best photos in the world, but may help someone correctly ID the species in the field.

I will return in a month hopefully to spot the female ...