Purple Thorn
Selenia tetralunaria
The purple thorn is a moth of the family Geometridae. The species was first described by Johann Siegfried Hufnagel in 1767. It is a species of both Northern Europe and Central Europe. It has a scattered distribution in Britain but is absent from Ireland. Source
Where it is now
No records in the last 8 weeks. It may be out of season where the observers and sensors are.
See the Purple Thorn on the live map
Movement and weather
Over the weeks it was present in the past year, its centre in Europe ranged from 48°N in March to 62°N in June, about 1,600 km apart.
Arrival dates
The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.
| Region | First arrival | Last arrival | Typical peak | Areas |
|---|---|---|---|---|
| Europe | 27 April 2026 | 20 July 2026 | 27 April 2026 | 2 |
Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.