198. Zygonyx ida Hagen, 1867

Number: 198  

Family: Libellulidae

Genus: Zygonyx  

Species: Zygonyx ida 

Common name(s): N/A  

Synonyms: Pseudomacromia luxuriosus Karsch, 1893    

Habitat: Lowland forested river   

Province(s) sighted: Hala-Bala Wildlife Sanctuary, (Narathiwat) 

Sightings (by me): Rare (1 male) 

In flight (that I have seen): April    

Species easily confused with: Zygonyx iris malayana

A very rare species for Thailand that can be found at Hala-Bala didn't let me down. Zygonyx ida is known from the extreme south of Thailand and is clearly a species that is restricted by range (apparently locally common in Malaysia). However, even right on the border it almost eluded me -- as did a number of species I wanted to see. However, observing a number of fast-flying specimens (mostly Z. iris malayana) I was eventually drawn to a male that, well, just seemed smaller and did its own thing. Instead of flying high up it purposefully flew close to the surface of the river but patrolled constantly in the same way as its more common cousin. After a number of poor shots in flight I managed to get one that was good enough for an ID and it was indeed Z. ida!!! So, I settled down and reeled off a million shots until I managed to get a couple that were of a decent level (for my standards anyway). Amazingly, it landed right in front of me on a long stem of grass but flew off well before I could adjust the camera. Still, I am happy with the photos and hope to see it again one day. I am sure that is can be found elsewhere in Thailand but Hala-Bala seems like the best place right now.

The male

Very similar to Z. iris malayana but is noticeably smaller and has distinct white rings along the abdomen.

64. Zygonyx iris malayana (Selys, 1869)

Number: 64

Family: Libellulidae

Genus: Zygonyx

Species: Zygonyx iris malayana

Common name(s): Iridescent Stream Glider

Thai name(s): แมลงปอบ้านตามาเลย์, แมลงปอบ้านจุดตา

Habitat: Waterfalls (specifically), mostly uplands
Province(s) sighted: Nam Nao NP (Petchabun);  Phu Kradueng NP, Phu Rua NP/environs (Loei); Widespread (Chiang Mai); Khao Yai (Nakhorn Ratchasima); Khao Soi Dao waterfall, Khao Kitchakut NP (Chantaburi); Kanchanaburi environs (Kanchanaburi); Koh Chang (Trat); Nang Rong Waterfall (Nakhorn Nayok).

Sightings (by me): Very common
In flight (that I have seen): March-November

Back in April 2010, I was in Chiang Mai and saw a good-sized dragonfly hovering high up and way out of reach to take a photo. Every waterfall I visited, I came across one or two specimens of the same species flying high up and over the waterfalls. Eventually, early one morning at Doi Suthep, I saw what looked like the same species resting in a dimly lit area under cover. I realised it was Zygonyx iris malayana. Since then, I have spotted this species at almost every waterfall I have visited. To the extreme that, should you see a decent-sized dragonfly circling above a large waterfall, there's a very good chance its this species.

The male

The adult male is very dark in colour, but has yellow markings along the abdomen.

A 'very mature' male...

This one is almost black and is very old indeed. This photo gives a good idea of size.

He still has his shiny metallic face, though.

The sub-adult male

The young adult male is very dark in colour, but has yellow markings along the abdomen and thorax. This will eventually turn a dark blue/purple colour as above.

Another sub-adult male

This photo shows the markings on the thorax.

The female

Although I had spotted two males perching, I still hadn't been able to spot a female that had landed. Luckily for me (and the dragonfly) I noticed one had got caught up, half in a web, half underwater. I pick it out and noticed it was a female. I took a few photos and let her go... off she went completely unharmed, but I had managed to get both the male and the female!!!

Another female I managed to catch with my fingers @ Nang Rong Waterfall, Nakhorn Nayok 28/03/2011. This one is dry!

Flying high...

This female was being rather inquisitive and I managed to get a fairly good shot of it in flight.

A copula

This was a fairly common sight. What's more, you heard them before you saw them. The male would swoop down and there would be a battle before the male beat the female into submission. They would then fly around like this for long periods.

Oviposting...

While still in flight, the tandem would swoop down and the appendages of the female would brush lightly against the rocks in extremely shallow water to release an egg. This would continue for long periods.

I have seen this species all around Chiang Mai, Chiang Rai, Kanchanaburi, Chantaburi, Nakhon Nayok, Nam Nao NP, Koh Chang and Khao Yai and they are rather abundant. It is quite easy to spot them in flight, but you may have to wait around for some time before they decide to take a rest.