Petrelaea dana
In 3 days ~10% in a week ~20%
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.
Rare
Under 5% of wildlife watchers report a Dingy Lineblue sighting in Singapore on a given day, based on 23 verified sightings from GBIF citizen-science data. It is the 524th most-seen of the 1045 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
October
In that month about 10% of wildlife watchers report a Dingy Lineblue in Singapore on a given day, against under 5% in November to September, 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.
Among the best
Of the 3 cities where we can rate Dingy Lineblue sightings, Singapore ranks 3rd at under 5%, level with the leaders once rounded. The best odds are in Mumbai (India, under 5%) and Kochi (India, under 5%).
Same family: Lycaenidae
The closest relatives of the Dingy Lineblue that you can see in Singapore (family Lycaenidae, Gossamer-winged Butterflies) are Branded Imperial (about 20%), Lesser Grass Blue (about 20%) and Tiny Grass Blue (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Dingy Lineblue is recorded against all the insects logged in Singapore (23 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.
