The mine begins somewhere halfway the blade as an upwards running
corridor. After a while the direction reverses, and an elongate
blotch develops occupying half the width of the leaf. Frass, light
green at first, grey later, concentrated in the lowest part of the
mine. Pupation external (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).
Yellowish green to greyish; head black, prothoracic plate light
brown (Bladmineerders van Europa).
Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).
Described by Patocka (1999a) and Patocka and Turcáni (2005a).
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:
Mines are found in United Kingdom from March - May, but possibly
have two generations as in continental Europe (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland: Britain including Bedfordshire (VC30),
Cambridgeshire (VC29), East Kent (VC15), East Norfolk (VC27), East Suffolk (VC25), North Hampshire (VC12),
North Wiltshire (VC7), South Devon (VC3), South Wiltshire (VC8), Staffordshire (VC39), West Norfolk (VC28), West Suffolk (VC26) and Worcestershire (VC37) (NBN
Gateway, as Biselachista utonella).
recorded in the Republic of Ireland (Karsholt and van Nieukerken
in Fauna Europaea). See also Ireland's NBDC interactive map.
NBN Grid Map:
utonella, as Biselachista utonella
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elsewhere: Widespread in continental Europe including Austria,
Belgium, Czech Republic, Danish mainland, Estonia, Finland, French
mainland, Germany, Hungary, Italian mainland, Latvia, Lithuania,
Norwegian mainland, Poland, Romania, Slovakia, 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: Currently unknown.