Onychargia atrocyana
In 3 days ~50% in a week ~80%
Onychargia atrocyana a species of damselfly in the family Platycnemididae. This species is commonly known as the marsh dancer or black marsh dart. It is found in Asia: Bangladesh, China, Hong Kong, Indonesia, India, Sri Lanka, Myanmar, Malaysia, Philippines, Peninsular Malaysia, Singapore, Thailand, Viet Nam.
It is a medium sized damselfly with velvet-black head, thorax and black-capped brown eyes. The dorsum of the thorax has narrow citron-yellow ante humeral stripes in the sub-adult and teneral stage. The sides are citron-yellow, marked with a broad oblique black stripe over the postero-lateral suture in that stage. But all these marks are obscured by pruinescence in adults. Abdomen is black, unmarked in the adult; but with narrow bluish basal rings on segments 3 to 6. There are yellow marks on the lateral sides of segment 1 and 2 in sub-adults. Female is similar to the sub-adult male with yellow marks.
It breeds in ponds and marshes in forests. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kinabatangan Wildlife Sanctuary | 🇲🇾 Malaysia | |
| 2 | Sepilok | 🇲🇾 Malaysia | |
| 3 | Khao Yai National Park | 🇹🇭 Thailand |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tamluk | 🇮🇳 India | |
| 2 | Kolkata | 🇮🇳 India | |
| 3 | Guwahati | 🇮🇳 India | |
| 4 | Dhaka | 🇧🇩 Bangladesh | |
| 5 | Colombo [Sri Jayawardenepura Kotte] | 🇱🇰 Sri Lanka | |
| 6 | Prayagraj | 🇮🇳 India | |
| 7 | Ho Chi Minh City | 🇻🇳 Vietnam | |
| 8 | Kochi | 🇮🇳 India | |
| 9 | Bangkok | 🇹🇭 Thailand | |
| 10 | New Delhi | 🇮🇳 India |
Possible
About 20% of wildlife watchers report a Marsh Dancer sighting in Colombo [Sri Jayawardenepura Kotte] on a given day, based on 55 verified sightings from GBIF citizen-science data. It is the 13th most-seen of the 182 insects we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
February, May, July and October–December
In those months about 30% of wildlife watchers report a Marsh Dancer in Colombo [Sri Jayawardenepura Kotte] on a given day, against about 10% in March and April, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Marsh Dancer sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
5th of 12
Of the 12 cities where we can rate Marsh Dancer sightings, Colombo [Sri Jayawardenepura Kotte] ranks 5th at about 20%. The best odds are in Tamluk (India, about 30%), Kolkata (India, about 30%) and Guwahati (India, about 30%).
Same family: Platycnemididae
The closest relatives of the Marsh Dancer that you can see in Colombo [Sri Jayawardenepura Kotte] (family Platycnemididae, White-legged damselflies) are Yellow Featherlegs (about 20%) and Stripe-Headed Threadtail (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Marsh Dancer is recorded against all the insects logged in Colombo [Sri Jayawardenepura Kotte] (55 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
