Leaf-miner: Oviposition in the midrib. From there a corridor the larva enters
the lamina which suddenly and strongly widens. The larva finally
pupates in a globular cocoon inside the mine. Because the mine is
formed when the leaf already is fully developed mined leaves have
a normal shape (Bladmineerders van Europa).
The mine is rather flat and not inflated, unlike some other Orchestes species (British
Larva: The larvae of beetles have a head capsule and chewing mouthparts with opposable mandibles and lack abdominal legs (see examples).
The larva is yellow (British
leafminers). Illustrated in Bladmineerders van Europa.
Pupa: The pupae of beetles have visible head appendages, wings and legs which lie in sheaths (see examples).
According to Hering (1957a) this blotch part is situated against
the leaf margin, and in the distal part of the leaf; this would
separate this mine from that of Tachyerges
stigma . However, Scherf (1964a) writes that at least in
Alnus, the two mines cannot be told apart (Bladmineerders van Europa).
Hosts in Great Britain & Ireland:
of year - larvae: June to August (British
of year - adults: Currently unknown.
in Great Britain & Ireland: A southern species in the Britain
leafminers) including Dorset (VC9), North Essex (VC19), North Somerset (VC6), South
Hampshire (VC11) and Surrey (VC17) (NBN
elsewhere: Widespread in continental Europe including French
mainland, Germany, Italian mainland, Poland, Slovakia. Also recorded
in the East Palaearctic (Alonso-Zarazaga in Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.