and case-bearer: The larva feeds on a wide range of trees, shrubs and herbs, favouring
Rosaceae, but not exclusively. The fully developed cased larva may
be found active in October and again, after winter diapause, in
April. Cases, about 6 mm, of diapausing larvae may be found through
winter, fixed to a tree or fence post. The dorsal surface of the
case is usually covered in leaf fragments, but they can sometimes
be worn off almost smooth. The ventral surface is swollen at the
middle and has a keel, which usually bends upwards at the posterior.
The cases of C. ahenella (on Rhamnus, Frangula, Viburnum and Cornus) and C.
potentillae (case less swollen, keel not bent up, resting
position less prone) are very similar (UKMoths).
lobe case that lies almost flat on the leaf, either on the upper
or on the lower side. Case widest about the middle. Ventrally there
is a distinct keel. Mouth angle 0°. Full depth mines rather
large. The flaps of cuticular tissue that serve to enlarge the case
are cut out of the upper epidermis. (contrary to C.
ahenella and C.
potentillae, that use tissue from the lower epidermis).
The removal of these tissue flaps creates holes that are much larger
than those that serve as the entrance to the mine (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).
The larva is illustrated in Bladmineerders van Europa.
Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).
The adult is illustrated in UKMoths by Martin Kennard. The male
and female genitalia are illustrated by the Lepidoptera Dissection Group.
Hosts in Great Britain & Ireland:
of year - larvae: July to April (British
of year - adults: The moth flies in evenings and at night in
late May and June (UKMoths).
in Great Britain & Ireland: A wide variety of habitats throughout
including Bedfordshire (VC30), Buckinghamshire (VC24), Caernarvonshire (VC49), Cambridgeshire (VC29),
East Gloucestershire (VC33), Glamorganshire (VC41), Herefordshire (VC36), Hertfordshire (VC20), Merionethshire (VC48),
Mid-west Yorkshire (VC64), Middlesex (VC21), North Essex (VC19), North Hampshire (VC12), North Somerset (VC6), North Wiltshire (VC7), South Wiltshire (VC8), Warwickshire (VC38), West Gloucestershire (VC34),
West Suffolk (VC26), West Sussex (VC13) and Worcestershire (VC37) (NBN
the day it may be found resting on vegetation (UKMoths).
NBN Grid Map:
Distribution elsewhere: Widespread in continental Europe including Austria, Belgium,
Czech Republic, Danish mainland, Estonia, Finland, French mainland,
Germany, Greek mainland, Hungary, Italian mainland, Latvia, Lithuania,
Norwegian mainland, Poland, Russia - South, Slovakia, Slovenia,
Sweden, Switzerland and The Netherlands. Also recorded in Near East
and North Africa (Karsholt and van Nieukerken in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: