Leaf-miner: The mine is greater than 16 mm long, no creases in lower epidermis
and a central green patch on upper side (British
large, lower-surface tentiform mine, c. 20 mm long, often not far
from the leaf base. The lower epidermis seems smooth to the naked
eye, but with a lens many fine length folds are visible. Frass as
a black mass in a corner of the mine. Before ecdysis the pupa works
itself hafway out of the mine; unlike the other western European
oak Phyllonorycter, that have the exuvium pale olive or reddish
brown, in roboris it is dark, blackish (Emmet, 1975b) (Bladmineerders van Europa).
Larva: The larvae of moths have a head capsule and chewing mouthparts with opposable mandibles (see video of a gracillarid larva feeding), six thoracic legs and abdominal legs (see examples).
Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).
The pupa is illustrated in Bladmineerders van Europa. The cremaster is illustrated in British
The adult is illustrated in UKMoths.
The genitalia are not illustrated by the Lepidoptera Dissection
Group (check for update).
Hosts in Great Britain & Ireland:
of year - larvae: July - August (British
of year - adults: The adults fly in June in a single generation
in Great Britain & Ireland: Found in mature oak woodland,
and is distributed though uncommonly, throughout England, Wales
and Ireland (UKMoths)
including Denbighshire (VC50), Derbyshire (VC57), Flintshire (VC51), Glamorganshire (VC41), Herefordshire (VC36),
Nottinghamshire (VC56), Shropshire (VC40), South Devon (VC3), Stafford and Worcestershire (VC37) (NBN
See also British
leafminers distribution map.
NBN Grid Map:
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elsewhere: Widespread in continental Europe including Albania,
Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Danish mainland,
Estonia, Finland, French mainland, Germany, Greek mainland, Hungary,
Italian mainland, Latvia, Lithuania, Luxembourg, Norwegian mainland,
Poland, Portuguese mainland, Romania, Russia - Central, East, Northwest
and South, Sicily, Slovakia, Spanish mainland, Sweden, Switzerland,
The Netherlands and Ukraine. Also recorded in Near East (Karsholt
and van Nieukerken in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere:
|Achrysocharoides latreillii (Curtis, 1826)
|Chrysocharis nephereus (Walker, 1839)
|Chrysocharis phryne (Walker, 1839)
lyncus Walker, 1841
|| Eulophidae: Eulophinae
|Sympiesis gordius (Walker, 1839)
|Baryscapus szöcsi (Erdös, 1958)
|Glyptapanteles fraternus (Reinhard, 1881)
stylata Förster, 1862
braconius Haliday, 1833
|Rhysipolis meditator (Haliday, 1836)
|Rhysipolis variabilis (Szépligeti, 1896)
|Scambus inanis (Schrank, 1802)