Prosotas dubiosa
In 3 days ~40% in a week ~70%
Prosotas dubiosa, the tailless lineblue or small purple lineblue, is a blue butterfly (Lycaenidae) found in Asia to Australia. The species was first described by Georg Semper in 1879. Unlike many other species in the Prosotas genus, P. dubiosa does not have hair-like filaments ("tails") protruding from its hindwings, thus the tailless in its common name.
Prosotas dubiosa subardates (Piepers & Snellen, 1918) - Java, Sulawesi The butterfly occurs in Sri Lanka and peninsular India and the Himalayas from Sikkim to Assam. The range extends onto Myanmar and Yunnan, and, possibly Thailand, Peninsular Malaysia, Singapore, Hong Kong, Sumatra, Borneo and Java. Possibly Philippines and Sulawesi. Further east the butterfly occurs in Australia, New Guinea and the Solomon Islands. In Australia the butterfly occurs from Northern Australia to New South Wales (Coffs Harbour).
List of butterflies of India (Lycaenidae... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cuc Phuong National Park | 🇻🇳 Vietnam | |
| 2 | Kaeng Krachan National Park | 🇹🇭 Thailand | |
| 3 | Kakadu National Park | 🇦🇺 Australia |
Possible
About 20% of wildlife watchers report a Tailless Lineblue sighting in Tuen Mun on a given day, based on 76 verified sightings from GBIF citizen-science data. It is the 61st most-seen of the 557 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
May
In that month about 30% of wildlife watchers report a Tailless Lineblue in Tuen Mun on a given day, against under 5% in February, the lowest month. That is one of Tuen Mun's wettest months, with about 230 mm of rain against 20 mm in December.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Tailless Lineblue sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 21
Of the 21 cities where we can rate Tailless Lineblue sightings, Tuen Mun ranks 2nd at about 20%. The best odds are in Jabalpur (India, about 30%).
Same family: Lycaenidae
The closest relatives of the Tailless Lineblue that you can see in Tuen Mun (family Lycaenidae, Gossamer-winged Butterflies) are Pale Grass Blue (about 30%), Common Hedge Blue (about 30%) and Chocolate Royal (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Tailless Lineblue is recorded against all the insects logged in Tuen Mun (76 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.
