204: Prodasineura collaris (Selys, 1860)

Number: 204 / Family: Platycnemididae / Genus: Prodasineura

Species: Prodasineura collaris / Collared Threadtail

Habitat: Seepage/overflow, swampy areas, connected to streams

Province(s) sighted: Narathiwat, Yala

In flight: April-August / Sightings (by me): Uncommon    

Species easily confused with: Prodasineura doisuthepensis

Though beautiful little damsels, Prodasineura species are difficult to get good photos of as they tend to hang around the edges of streams and very low down. It was no different when I saw a male Prodasineura collaris, commonly known as the Collared Threadtail. As light was fading fast, I managed to spot a male on my first day deep down perched over a tiny trickle. However, with the light almost gone so too did my chances of getting anything worthy of a good photo.

Two days later, I returned to the same spot and there was a female Prodasineura species on a stick just above a collection of leaves over seepage almost in the exact same place as the male. It was clearly a female P. collaris and she was fairly happy to let me snap away. Content with my shot of the female, I decided to go after the male once more. I pushed my way through bushes and dropped down about 5-6 feet to where there was a little bit more seepage/trickle and there he was. This time I managed to get a few fairly decent photos, especially as he was in such an awkward place. Since then I have returned to Narathiwat and Yala and found this species in a few locations, but it is definitely an uncommon species.

The male.
It is easy to ID this species and I am pretty sure it gets its name from the distinct blue band across its collar!

It typically sits low down just above the water...

The female.
The female is like most other females in the genus but it has a blueish tinge to it and fortunately for ID purposes, it was the only species in the area.

195: Prodasineura humeralis Selys, 1860

Number: 195 / Family: Platycnemididae / Genus: Prodasineura

Species: Prodasineura humeralis* / Orange-striped Threadtail  

Habitat: Forested Sandy-bottomed Streams  

Province(s) sighted: Narathiwat, Songkhla, Yala

In flight: April-August / Sightings (by me): Locally common    

Species easily confused with: Prodasineura autumnalis, prodasineura verticalis


*In Thailand, this is currently known as Prodasineura sp. as it is possible that it is, in fact, P. autumnalis However, for the time being, I will keep it as P. humeralis, which is found commonly throughout Malaysia and would make sense that it is the same species.

One species that I expected to see at Hala-Bala did not disappoint, although it took a little bit of searching to find it. Instead of being at the wildlife sanctuary, it was fairly abundant at a couple of the more open and sandy-bottomed streams nearer the base of Bala. Prodasineura humeralis, commonly known as the Orange-striped Threadtail, is very similar in every aspect to P. autumnulis and P. verticalis and the genus needs revision. Like most species in the genus, it likes to hang low down near the stream's edges and is difficult to photograph. These were the best I could get in blazing sunshine, as my neck was slowly turning into the appearance of a gingerbread biscuit. Since then, I have returned to the deep south and this species was abundant at many forested streams throughout the region.

The male
The male is identifiable due to its dominant orange stripe on a black thorax, which gives it its common name. Can be found quite easily along shallow, slow-moving and sandy-bottomed streams.

Like other species in the genus, P. humeralis loves perching just above water level, making photography difficult.

The 'Young' Male

I was fortunate enough to spot a young male, which looks almost like every other species in the genus at this stage. Fortunately, it was the only species present making ID easy.

108: Prodasineura laidlawii (Förster in Laidlaw, 1907)

No: 108 / Family: Platycnemididae / Genus: Prodasineura

Name: Prodasineura laidlawii / Laidlaw's Threadtail

Habitat:  Slow, uplands rivers and streams

Province(s): Kanchanaburi, Phuket, Narathiwat, Yala, Songkhla
In flight: March-August / Sightings (by me): Locally common

Easily confused with: N/A

My recent trip to Kanchanaburi proved to be fairly successful, even though it is early in the 'flight' season. I will post all my findings as they are identified by Noppadon Makbun. Some, though, are easy to identify, even by me!

The first species I found and one I expected to see was Prodasineura laidlawi, my 6th species from the Prodasineura genus. I now just need to find, P. humeralis and P. collaris to complete the set. Hopefully I will find these species when I travel south in October. Since then, I have travelled extensively in the deep south and managed to find both the these species, alongside P. laidlawi on several occasions. 

The male

The male is easy to identify and perches on twigs and leaves at the edge of the river. They are easy to spot with their blue stripes on the thorax. Segments 9-10 are blue dorsally and the caudal appendages are also blue. 

S8 also has a blue mark which changes as it ages. See photos below.

See how the marking on S8 has become more prominent as it ages.

A Copula

I wasn't able to spot an individual female in the short time I visited Kanchanaburi, but I did manage to see a copula. You can see that the female is similar to the male, but much duller.

You can see this species in Kanchanaburi all year, especially at Erawan waterfall (if you can handle photographing nature amongst thousands of tourists in speedos). 

44. Prodasineura auricolor (Fraser, 1927)

No: 44 / Family: Platycnemididae / Genus: Prodasineura

Name: Prodasineura auricolor / Golden Threadtail* 

Habitat: Forested Streams
Province(s): Chaiyaphum, Petchabun
In flight: June-October / Sightings (by me): Locally common

Easily confused with: N/A

*As there is no common name, I decided to adapt the Thai name 'Golden' and 'Threadtail' used for the genus, so the Golden Threadtail.

The fifth Prodasineura addition to my blog, and the latest I have seen, is Prodasineura auricolor. I saw this species the second time I visited Nam Nao National Park, back in October 2010. I saw two males, one in almost darkness and the other in bright sunshine. The second one I saw, would not keep still and continually moved its abdomen around, providing me with some strange looking photos. Since then I have seen this quite regularly at Phu Khieo Wildlife Sanctuary and Nam Na Naional Park.

The Male

The male is easy to identify as it has bright orange and white markings on its thorax and blue dorsal patch on S10.

The Female

Similar to other species in the genus, but can't be confused because of its orange colouration to the thoracic stripes. Unlike the male, she likes to hide away under the protection of the bushes.

43. Prodasineura doisuthepensis (Hoess, 2007)

No: 43 / Family: Platycnemididae / Genus: Prodasineura

Name: Prodasineura doisuthepensis / Doi Suthep's Threadtail

Habitat: Forested streams
Province(s): Chiang Mai, Chaiyaphum, Petchabun
In flight: March-May / Sightings (by me): Locally common

Easily confused with: Prodasineura coerulescens, Prodasineura collaris

The fourth species of the genus Prodasineura I have now added to my blog is Prodasineura doisuthepensis. I initially thought this was P. collaris, until my mistake was pointed out to me by Noppadon Makbun (who else?!) When I visited Chiang Mai in March 2010, this species was abundant high up in the national parks, especially (you guessed it) Doi Suthep. I recently saw many specimens residing at the stream which runs through Nam Nao NP ... I was really happy to see this species here. Since then, I have seen this species quite a lot, especially around Chaiyaphum and Petchabun.

The Male

The male is easily distinguished by its bold blue marks to the thorax and abdomen. They like to sit in the sunshine over streams.

The Female

The female is much more boring in comparison and is similar to other females of the Prodasineura genus. It does have slightly blueish hues to the thorax and eyes.

Ovipositing ...

Though not the best photos in the world (it was dark, really low down and at an almost impossible angle - how I wish I'd had my Canon 60D then!), but they show how this species oviposits. 

These shots were from Nam Nao NP ...

42. Prodasineura sp. [nec. verticalis Selys, 1860]

No: 42 / Family: Platycnemididae / Genus: Prodasineura

Name: Prodasineura sp. [nec. verticalis Selys, 1860] / Orange-bellied Threadtail* 

Habitat: Forested streams
Province(s): Chiang Mai, Trat, Kanchanaburi, Chaiyaphum, Petchabun, Ubon Ratchathani, Sisaket
In flight: March-August / Sightings (by me): Locally common

Easily confused with: N/A

*As there is no common name, I used took the Thai name which fits perfectly.

When I went to Chiang Mai back in March-May 2010, I noticed a species of Prodasineura that I instantly fell in love with. Prodasineura verticalis, known now as the Orange-bellied Threadtail. Since I saw this species for the first time, Noppadon Makbun told me that there are 3 distinct forms of this species; 'Northern', 'Eastern' and 'Western' forms, which I have been lucky enough to spot and photograph. Without Noppadon mentioning this, I would have over-looked the other forms. If you compare the three males, you can see significant differences. Noppadon isn't sure which is the true form of the species. It's a fantastic looking species and is the 3rd Prodasineura damselfly I have added to my blog.

The 'Northern' Male

The male has wonderful red, black and orange stripes on the thorax and the abdomen is completely black except for the caudal appendages which are a greyish colour. This specimen I saw in Chiang Mai.

The 'Teneral' Male

This is a newly emerged northern male, possibly right at the edge of its range and emergence window as I saw this early one morning in Phu Him Rong Kla, Phitsanulok province, in August, 2025. You can see it has narrow reddish bands on the thorax like the specimen above and has whitish appendages.

The 'Eastern' Male

The thoracic dorsal markings are much broader than the 'Northern' specimen. Other markings are slightly different too. Caudal appendages are also black, not greyish (as above). This specimen I saw in Ubon Ratchathani in April, 2022.

This specimen I saw at a small river, Koh Chang (13/04/2011).

The 'Western' Male

Though not the best angle in the world, you can see that the markings on the thorax are different again to the two above (they are slimmer and straigher) and the caudal appendages are black. This one I saw at Kanchanaburi (26/03/2011).

The 'Northern' Female

The female looks similar to all species in the Prodasineura genus, except it has a slightly red tinge to the thoracic markings. Again, this specimen I saw in Chiang Mai.

The 'Eastern' female

Again, even with the female, the thoracic markings are much slimmer than the Northern form. This specimen was ovipositing at a small river, Koh Chang.

The 'Eastern' Copula, Ovipositing

The 'Western' female

This isn't a very good shot and so comparing this specimen is difficult. It was raining and under heavy tree cover, making it really dark. It was also too high up to see dorsally and flew away when it tried to get above it. I will get a better example soon. I saw this female in Kanchanaburi.

41. Prodasineura coerulescens (Fraser, 1932)

No: 41 / Family: Platycnemididae / Genus: Prodasineura

Name: Prodasineura coerulescens / Fork-tipped Threadtail* 

Habitat: Tree-lined river, lowlands
Province(s): Khon Kaen
In flight: November-March / Sightings (by me): Rare

Easily confused with: N/A

*Name made up by me (based on Thai names/existing common names of other species in genus).

The second species of the genus Prodasineura I ever saw, was Prodasineura coerulescens. I was taking photos at the River Chi, Khon Kaen back in December 2008. I thought I had come across another P. autumnulis, but then noticed its azure blue colouration. Then it hit me... it's a new species for me! I have since seen 3-4 males and a female. That said, I haven't spotted this species of damselfly for over 2 years.

The Male

Very similar to a young P. autumnulis in appearance, but has wonderful azure blue stripes on its thorax, end segments and its eyes. It is also fairly easy to get close to and photograph. 

I recently returned to the same area [23.xi.13] and saw about 6-7 and the same numbers of females within a very small area of banking, deep undercover.

Like many species in the Prodasinerua genus, they tend to hover for long periods before they settle again (often not until they have caught something to eat).

The Female

The female resembles P. autumnulis. However, I saw a number females roosting along with males. The only difference I can see between the two females is that the abdomen of P. coerulescens seems slightly longer and, like the male, is fairly easy to approach.

This female I saw back in 2009.

I have only spotted this species in Khon Kaen and it is seldom seen even here. It is apparently known along the west of Thailand, but I don't think it is commonly seen.