In autumn the larva makes a long, brown corridor, and hibernates
therein. In spring a new mine is made in another leaf. This one
starts near the base of the blade, widens upwards, and finally forms
an elongate yellowish irregular blotch of 3-5 cm in length. Pupation
externa[; the pupa is attached to the mine without a cocoon.
to Martini (1912a) a characteristic of this species is the extreme
precision with which the mine joins up with the length venation
of the leaf (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 of serricornis has body greyish green with a whitish dorsal line. Head and prothoracic
plate light brown. Meso- and metanotum each with a lateral mark,
connected by a whitish streak (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. The male genitalia, but not the female genitalia (check for update), are not illustrated by the Lepidoptera
Hosts in Great Britain & Ireland:
of year - larvae:
Larvae are found in the autumn until April in the next year (Bladmineerders van Europa).
of year - adults: Currently unknown.
in Great Britain & Ireland: Britain including Cheshire (VC58),
North Essex and Stafford (NBN
Gateway, as Biselachista serricornis).
recorded in the Republic of Ireland and Northern
Ireland (Karsholt and van Nieukerken in Fauna Europaea). See also Ireland's NBDC interactive map.
NBN Grid Map:
serricornis, as Biselachista serricornis
NBN Grid Map : NBN Terms and Conditions
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elsewhere: Widespread in continental Europe including Austria,
Czech Republic, Danish mainland, Estonia, Finland, Germany, Hungary,
Italian mainland, Latvia, Lithuania, Poland, Russia - North and
Northwest, 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: