Egg at the upperside or underside of the leaf. The mine begins as
a long narrow corridor with a linear frass line. The corridor abruptly
widens into a blotch that in the end may occupy almost an entire
leaflet. The blotch mostly starts at the base of the leaflet, and
here also most frass is concentrated. Pupation generally within
the mine; in rare cases the larva leaves the mine by an exit slit
in the lower epidermis (Bladmineerders van Europa).
Initially forms a slender gallery at the leaf edge and then doubles back, along the original workings, towards the petiole. It then forms a blotch, which occupies the whole leaf. the frass is deposited in the base of the leaf. The mine is similar to that formed by T.cryptella (British
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).
Pale yellow, seeming green when still in the mine. The larva is
described by Gustafsson and van Nieukerken (1990a); thorax 1-3
dorsally with 10, 10, and 8 pairs of setae, respectively (Bladmineerders van Europa).
Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).
The adult is not illustrated in UKMoths (check for update). The genitalia are not illustrated by the Lepidoptera
Dissection Group (check for update).
Hosts in Great Britain & Ireland:
of year - larvae:
July to October (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland: Britain including North Hampshire
and South Wiltshire
recorded in the Republic of Ireland (Karsholt and van Nieukerken
in Fauna Europaea). See also Ireland's NBDC interactive map.
NBN Grid Map:
elsewhere: Widespread in continental Europe including Austria,
Croatia, Czech Republic, Danish mainland, European Turkey, French
mainland, Germany, Greek mainland, Hungary, Italian mainland, Macedonia,
Norwegian mainland, Portuguese mainland, Sardinia, Slovakia, Slovenia,
Spanish mainland, Sweden, Switzerland and The Netherlands (Karsholt
and van Nieukerken in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: