Petrelaea dana
In 3 days ~50% in a week ~80%
Petrelaea dana, the dingy lineblue, is a species of lycaenid butterfly found in Indomalayan realm. Male upperside: from pale violet to dark bluish purple. Forewings and hindwings: comparatively broad, anteciliary brown lines widened slightly at apex of forewing. Hindwing: in addition costal and dorsal margins narrowly paler and duller in colour; termen not furnished with a tail at apex of vein 2. Underside: dull hair-brown to ochraceous brown. Forewing: two pairs of short, slender, transverse white strigae, the inner pair from costa to median vein across middle of cell, the outer pair from costa along each side of the discocellulars stopping short at lower apex of cell; a transverse, discal, bisinuate, catenulated (chain-like) narrow band formed of a double series of slender white lunules followed by an inner and outer subterminal series of transversely elongate spots enclosed in or bordered on the inner and outer sides by obscure slender whitish lunules; lastly, a dark brown anteciliary line. Hindwing: crossed by the following slender white lunular lines: two subbasal, two short lines near apex of cell, one on each side of the discocellulars, and two highly irregular... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Periyar National Park | 🇮🇳 India |
More parks will be added in future updates.
Possible
About 20% of wildlife watchers report a Dingy Lineblue sighting in Periyar National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 31st most-seen of the 44 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.
October and November
In those months about 40% of wildlife watchers report a Dingy Lineblue in Periyar National Park on a given day, against under 5% in September and December–July, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Dingy Lineblue sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Periyar National Park, in our data
Periyar National Park is the only park on Wallace's Line with enough records to rate Dingy Lineblue sightings: about 20% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Dingy Lineblue is recorded against all the insects logged in Periyar National Park (6 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.
