Parornix devoniella
In 3 days ~10% in a week ~20%
Parornix devoniella is a moth of the family Gracillariidae found in Europe. The larvae are leaf miners, feeding on the tissue inside the leaves of hazels Corylus species. The wingspan is 9–10 mm. The head is whitish mixed with fuscous. Palpi white, apex of second joint and median band of terminal dark fuscous. Forewings are grey irrorated with dark fuscous and whitish; numerous costal strigulae, an indistinct posterior spot in disc preceded by a blackish elongate spot, and suffused dorsal strigulae interrupted by two elongate blackish spots whitish; a black apical dot cilia with three entire dark fuscous lines. Hindwings are grey.
The larva is whitish-green; dorsal line dark green; head brown; segment 2 with four black spots. Adults are on wing in May and again in August in two generations. The larvae mine the leaves of hazel (Corylus avellana), Turkish hazel (Corylus colurna) and the filbert (Corylus maxima).
It is known from all of Europe (except the Iberian Peninsula, the Balkan Peninsula and the Mediterranean islands). Parornix devoniella was originally named by the English entomologist, Henry Tibbats Stainton in... Wikipedia →
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More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Hazel Slender sighting in London on a given day, based on 7 verified sightings from GBIF citizen-science data. It is the 1300th most-seen of the 1504 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.
November
In that month about 10% of wildlife watchers report a Hazel Slender in London on a given day, against under 5% in December to October, the lowest months.
2nd of 2
Of the 2 cities where we can rate Hazel Slender sightings, London ranks 2nd at under 5%. The best odds are in Liverpool (United Kingdom, about 10%).
Same family: Gracillariidae
The closest relatives of the Hazel Slender that you can see in London (family Gracillariidae, Leaf Blotch Miner Moths) are Horse-Chestnut Leafminer (about 20%), Firethorn Leafminer (about 10%) and London Midget (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Hazel Slender is recorded against all the insects logged in London (7 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.
