Onychargia atrocyana
In 3 days ~20% in a week ~40%
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 |
With luck
About 10% of wildlife watchers report a Marsh Dancer sighting in New Delhi on a given day, based on 16 verified sightings from GBIF citizen-science data. It is the 86th most-seen of the 174 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
April
In that month about 20% of wildlife watchers report a Marsh Dancer in New Delhi on a given day, against under 5% in June and August–March, the lowest months. That is one of New Delhi's driest months, with about 15 mm of rain against 220 mm in July.
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.
10th of 12
Of the 12 cities where we can rate Marsh Dancer sightings, New Delhi ranks 10th at about 10%. The best odds are in Tamluk (India, about 30%), Kolkata (India, about 30%) and Guwahati (India, about 30%).
Same order: Odonata
The closest relatives of the Marsh Dancer that you can see in New Delhi (order Odonata, Dragonflies and Damselflies) are Scarlet Skimmer (about 30%), Ditch Jewel (about 20%) and Western Golden Dartlet (about 20%), 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 New Delhi (16 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.
