Pseudoterpna coronillaria
In 3 days ~20% in a week ~50%
Pseudoterpna coronillaria, the Jersey emerald or gorse emerald, is a moth of the family Geometridae. The species was first described by Jacob Hübner in 1796. It is known from Spain, Portugal, the Pyrenees, western and southern France, Corsica, Sardinia, Sicily, Italy, Samos, Rhodes, Turkey, Israel, Lebanon, northern Jordan and North Africa. It has not been reported from mainland Great Britain, but is present on Jersey, where it was previously overlooked as a form of the grass emerald, until 2001 when it was correctly identified.
The wingspan is 36–40 millimetres (1.4–1.6 in). They are on wing in June and July in western Europe. The larvae feed on Genista tinctoria, Ulex species and broom. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 2 | Pyrénées National Park | 🇫🇷 France |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto | 🇵🇹 Portugal |
With luck
About 10% of wildlife watchers report a Jersey Emerald sighting in Porto on a given day, based on 46 verified sightings from GBIF citizen-science data. It is the 117th most-seen of the 498 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
April to October
In those months about 10% of wildlife watchers report a Jersey Emerald in Porto on a given day, against under 5% in November to March, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Jersey Emerald sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Only Porto, in our data
Porto is the only city on Wallace's Line with enough records to rate Jersey Emerald sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Geometridae
The closest relatives of the Jersey Emerald that you can see in Porto (family Geometridae, Geometer Moths) are Double-Striped Pug (about 20%), Vestal (about 20%) and Pale Oak Beauty (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Jersey Emerald is recorded against all the insects logged in Porto (46 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.
