Small Rivulet
Perizoma alchemillata
Perizoma alchemillata, the small rivulet, is a moth of the genus Perizoma in the family Geometridae. The species was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae. Source
Where it is now
In the last 8 weeks this insect was recorded 4 times across 1 area (each area is a 5 degree square).
See the Small Rivulet on the live map
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 | 8 June 2026 | 22 June 2026 | 13 July 2026 | 4 |
Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.