Protohermes grandis
In 3 days ~10% in a week ~20%
Protohermes grandis is a species of dobsonfly occurring in China, Japan, Korea, and Taiwan, as well as South and North America, South Africa, Madagascar, Australia, and New Zealand. They are closely related to P. immaculatus. They are the biggest species of Protohermes fly.
P. grandis flies live in various ecosystems, ranging from streams to flatlands to forests to mountains. Larvae live in clear water (ex. in streams). They range in length from about 36 to 40 millimetres long and have a skinny body with 4 large wings. The body is light yellow-brown in color, with the wings bearing yellow spots. They are nocturnal, flying at night and resting during the day.
P. grandis, as well as all other megalopterans, have larvae that live in aquatic environments, most often freshwater environments. The larval life stage is fairly long (around 1 to 3 years), while the adult life stage is relatively short (around 4 to 7 days). The life stage duration varies depending on the type of aquatic environment they live in.
Adult P. grandis flies feed on the nectar inside Japanese chestnut flowers, usually at night... 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 Protohermes grandis sighting in Tokyo on a given day, based on 15 verified sightings from GBIF citizen-science data. It is the 534th 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Protohermes grandis in Tokyo on a given day, so our monthly data shows no clear season.
Only Tokyo, in our data
Tokyo is the only city on Wallace's Line with enough records to rate Protohermes grandis sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Protohermes grandis is recorded against all the insects logged in Tokyo (15 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.
