An emergence

Location:  Khao Soi Dao waterfall, Chantaburi province  
Date: Wednesday, 02 April, 2014 
  Areas visited: Waterfall and stream areas

On a recent trip to Chantaburi province, I was fortunate to see many odonates, including 3 new records for my slowly growing list (all my findings will be posted later). However, highlight of the trip for me was to witness my first full emergence of a damselfly. It was of a common species, male Euphaea masoni. I have added lots of photos below, which hopefully demonstrates nature at its best.

 

 

 

 

 

 

 

So, there you have it. My first sighting of an emergence. Now I just need to learn how to crop the size of the photos accurately. haha

75. Euphaea ochracea ochracea (Selys, 1859)

Number: 75

Family: Euphaeidae

Genus: Euphaea

Species: Euphaea ochracea ochracea

Common name(s): Ochraceous Darkie

Habitat: Forested streams (uplands & lowlands)

Province(s) sighted: Nam Nao NP/environs (Petchabun);  Phu Rua NP/environs (Loei); Widespread (Chiang Mai); Widespread (Chiang Rai); Khao Yai (Nakhorn Ratchasima); Khao Kitchakut NP (Chantaburi); Kanchanaburi environs (Kanchanaburi); Koh Chang (Trat).

Sightings (by me): Common and widespread

In flight (that I have seen): April-October

Another member of the Euphaea genus that you will come across from time to time at streams and rivers, is Euphaea ochracea ochracea. I often see it sitting on the edge of twigs and branches overhanging the stream.

The male

The male has red/brown wings (or should that be ochre - probably where it got its name), which are very distinctive and make it very easy to recognise. The male likes to perch on branches and twigs over-looking the river as he waits for prey or a mate.

Some days, you can find many specimens hiding far away from the edge of the streams.

In the hand...

Younger male ...

Here is a youngish male that still has prominent yellow markings. He was a fair distance from the stream at Nam Nao headquarters (30/06/12).

The female

I had only previously seen the female while part of a copula. Until I went to Phu Rua, that is. At a small stream waterfall just outside the town, there were literally hundreds of males and females dotted around. In one opening alone through the trees, there was around 15 females and 5-6 males. What's more, they weren't very shy and I even managed to capture some with my fingers. This was the only species of this genus present, which made identification easy... good job as I still can't tell the difference females of this genus.

In the hand...

This one I caught with my fingers. There were so many of them, I had to catch one!

An old female ... 

This old-looking female I saw recently at a tiny stream under tree shade. She simply didn't move as I approached.

A copula

I have now seen a small number of copula. However, they are extremely difficult to get close to and photograph. These are the best I have so far.

The male then simply flicked the female off with his abdomen and she went straight under the water. She remained for around 1 minute before flying straight up into the air and diving at great speed onto another stem underwater where I lost sight of her. It was an amazing sight.

Courtship display...

Here the male and female are facing each other. Moments later, the male grabbed the female (left) and they began to copulate. 

Another female in action...

Here's another female I saw dive in right at my feet and oviposited for around 25 seconds in an extremely rapid stream section.

Now she is completely submerged.

Amazingly she clung on for up to a minute before flying up and to another submerged bit of weed to continue. My foot was in the water near her and I could feel the strong current. I have no idea how she clung on. These were taken at Erawan Waterfall, Kanchanaburi.

74. Euphaea masoni (Selys, 1879)

Number: 74

Family: Euphaeidae

Genus: Euphaea

Species: Euphaea masoni

Common name(s): N/A

Thai name(s): แมลงปอเข็มน้ำตกสีดำ, แมลงปอเข็มหางโป่งสีนิล

Habitat: Forested streams, usually found in sun spots (uplands & lowlands)
Province(s) sighted: Nam Nao environs (Petchabun); Widespread (Chiang Mai); Widespread (Chiang Rai); Khao Yai NP (Nakhorn Ratchasima); Nang Rong Waterfall, Nakhon Nayok.
Sightings (by me): Common
In flight (that I have seen): March-December

On the brightest of days one species you will often encounter at forested streams is Euphaea masoni. It is very easy to indentify, as it is virtually black, including its wings. 

The male

 Only when it opens its wings, can you see any pattern at all. That said, I think its a rather handsome little fellow and one you should try to spot if you visit a river. The male loves to perch on twigs in baking hot sunshine.

Close up, eating lunch ...

Another male in the hand ...

The sub-adult male

 The young male is similar to the adult male but hasn't yet developed its black "furry" or pruinose thorax. Here it gives you the opportunity to see the markings which disappear under its black pruinose as it gets older. This male hid away from the river in the nearby bushes.

(photos taken 28/03/2011 @ Nang Rong Waterfall, Nakhon Nayok; added to blog 02/04/2011)

Close-up of young male's face

The female

Finally, I have managed to get good photos of the female. This genus is really difficult to differentiate the females, but at Nang Rong Waterfall, Nakhon Nayok, only this species was present.

(photo taken 13/04/2011 @ Koh Chang; added 26/04/2011)

Like buses, two come at once...

After looking for a long time to spot the female, I managed to spot 2 within the space of 10 minutes of each other. This one is much darker than the one above and I think is a young specimen (looks like the young male - please advise if you know otherwise). Again, like the young male, this one hid away from the stream in the bushes.

(photos taken 28/03/2011 @ Nang Rong Waterfall, Nakhon Nayok; added to blog 02/04/2011)

You can see this species throughout the country, especially at shallow streams, all year round.