Prosotas gracilis
In 3 days ~20% in a week ~40%
Prosotas gracilis or The Dark-based Lineblue is a butterfly in the family Lycaenidae. It was described by Julius Röber in 1886. It is found in the Indomalayan realm. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kaeng Krachan National Park | 🇹🇭 Thailand |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Dark-Based Lineblue sighting in Kaeng Krachan National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 172nd most-seen of the 296 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.
June
In that month about 20% of wildlife watchers report a Dark-Based Lineblue in Kaeng Krachan National Park on a given day, against under 5% in March–April, July–September and December–January, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Dark-Based Lineblue sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Kaeng Krachan National Park, in our data
Kaeng Krachan National Park is the only park on Wallace's Line with enough records to rate Dark-Based Lineblue sightings: about 10% of wildlife watchers there report one on a given day.
Same genus: Prosotas
The closest relatives of the Dark-Based Lineblue that you can see in Kaeng Krachan National Park (genus Prosotas, Line Blues) are Tailless Lineblue (about 10%) and Common Line Blue (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Dark-Based Lineblue is recorded against all the insects logged in Kaeng Krachan National Park (8 verified sightings from 2019 to 2026), 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.
