Megymenum gracilicorne
In 3 days ~10% in a week ~20%
The drab stinkbug (or saw-toothed stinkbug), Megymenum gracilicorne, is an insect in the family Dinidoridae. The species is found in East Asia and eats plants including cucurbits. It has the distinctive behavior of cultivating fungus on females' hind legs, which is used to protect their eggs from parasitic wasps. According to entomologist John Noyes, "this is a unique system, as far as I'm aware".
The family Dinidoridae is subdivided into two subfamilies: the Dinidorinae, and the Megymeninae, with the genus Megymenum in the latter. The Megymeninae have rough dorsal surfaces, unlike the smooth surfaces of the Dinidorinae, along with a linear arrangement of the spiracles (openings for air exchange) on their abdomens, and their trichobothria (hair-like sensory structures) are paired. A cladistic analysis places Megymenum pratti as M. gracilicorne's closest relative, with M. mekongum as the next closest. M. tauriformis is now considered to be identical to M. gracilicorne.
M. gracilicorne is found in Japan, Korea, China, Taiwan, and Hong Kong. It feeds on plants including the Cucurbitaceae, such as pumpkins and cucumbers... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Tokyo | 🇯🇵 Japan |
Rare
Under 5% of wildlife watchers report a Megymenum gracilicorne sighting in Tokyo on a given day, based on 16 verified sightings from GBIF citizen-science data. It is the 509th most-seen of the 1013 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.
June
In that month about 10% of wildlife watchers report a Megymenum gracilicorne in Tokyo on a given day, against under 5% in July to May, the lowest months.
Only Tokyo, in our data
Tokyo is the only city on Wallace's Line with enough records to rate Megymenum gracilicorne sightings: under 5% of wildlife watchers there report one on a given day.
Same order: Hemiptera
The closest relatives of the Megymenum gracilicorne that you can see in Tokyo (order Hemiptera, True Bugs, Hoppers, Aphids, and allies) are Yellow-Spotted Stink Bug (about 30%), Large Brown Cicada (about 30%) and Brown Winged Plant Hopper (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Megymenum gracilicorne is recorded against all the insects logged in Tokyo (16 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.
