Hemichroa crocea
In 3 days ~10% in a week ~20%
Hemichroa crocea, the striped alder sawfly or banded alder sawfly, is a species of sawfly in the family Tenthredinidae. It is probably native in Europe and has been introduced to North America. The larvae feed on the foliage of several species of alder and sometimes on birch, hazel and willow. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Wadden Sea National Park | 🇩🇪 Germany |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Striped Alder Sawfly sighting in Wadden Sea National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 536th most-seen of the 818 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.
September
In that month about 10% of wildlife watchers report a Striped Alder Sawfly in Wadden Sea National Park on a given day, against under 5% in October to August, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Striped Alder Sawfly sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Wadden Sea National Park, in our data
Wadden Sea National Park is the only park on Wallace's Line with enough records to rate Striped Alder Sawfly sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Tenthredinidae
The closest relatives of the Striped Alder Sawfly that you can see in Wadden Sea National Park (family Tenthredinidae, Common Sawflies) are Turnip Sawfly (about 10%) and Alder Sawfly (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Striped Alder Sawfly is recorded against all the insects logged in Wadden Sea National Park (7 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.
