Parapoynx stagnalis
In 3 days ~10% in a week ~30%
Parapoynx stagnalis, the rice case bearer or rice caseworm, is a species of moth in the family Crambidae. It has a wide distribution and is found in India, Sri Lanka, South-East Asia, South Africa, South America, southern Europe (Spain and Greece), Russia and Australia (the Northern Territory and Queensland).
The life cycle is completed in about 35–40 days. The length of the forewings is 15 mm. Adult has whitish wings with pale brown wavy markings. There are two black comma-shaped marks on each forewing. Male can be identified by narrow and uniform abdomen, whereas female abdomen is widest at the middle but tapering posteriorly. Female usually lay 150 eggs and first instar larvae emerge after a week. Final larva emerge after 20 days, and reaches its maximum length of 10-12mm. The moth has six larval instars. Due to branched tubular gills, caterpillars can respire in aquatic media. Therefore, instar can disperse through water. Pupation occurs when the pupal case is attached to the leaf sheath above the water level. After a week of pupation, adult emerges.
As its common name implies, rice caseworm is one of the major pests of rice throughout the world.... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sinharaja Forest Reserve | 🇱🇰 Sri Lanka | |
| 2 | Daintree National Park | 🇦🇺 Australia |
Rare
Under 5% of wildlife watchers report a Rice Case Bearer sighting in Chennai on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 298th most-seen of the 376 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
October to December
In those months about 10% of wildlife watchers report a Rice Case Bearer in Chennai on a given day, against under 5% in January to September, the lowest months. Those are among Chennai's wettest months, with about 230 mm of rain a month against 5 mm in February.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Rice Case Bearer sightings with a recorded time, and about 9 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
7th of 8
Of the 8 cities where we can rate Rice Case Bearer sightings, Chennai ranks 7th at under 5%. The best odds are in Kochi (India, about 10%), Colombo [Sri Jayawardenepura Kotte] (Sri Lanka, about 10%) and Pune (India, about 10%).
GBIF citizen-science records
It is estimated from how often the Rice Case Bearer is recorded against all the insects logged in Chennai (7 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.
