Leaf-miner: A long thin linear gallery with frass in a thin line, sometimes
broken. This distinguishes it form S.nylandriella,
which never has linear frass throughout the mine. The gallery of S.magadalenae is also narrower than S.nylandriella . S. magdalenae can both be an edge miner or make a small mine
in the leaf blade, or run along a vein (British
at the underside of the leaf, independent of the venation. The corridor
is narrow from start to end, and compressed on a small space, sometimes
following the leaf margin for a while, more often along a major
vein. Frass in a narrow, regularly interrupted central line. In
thick leaves the frass line is broader, and the corridor is shorter
(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 green (British
leafminers; Emmet, 1983a; Schoorl et al., 1985a; Gustafsson
and van Nieukerken, 1990a; 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 - August (British
of year - adults: Currently unknown.
in Great Britain & Ireland: Widespread in England, Wales,
Scotland and Northern Ireland including Cheshire (VC58), Derbyshire (VC57), Glamorganshire (VC41),
South Aberdeen and Stafford (NBN
See also British
leafminers distribution map.
recorded in the Republic of Ireland (Karsholt and van Nieukerken
in Fauna Europaea). See also Ireland's NBDC interactive map.
NBN Grid Map:
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Distribution elsewhere: Widespread in continental Europe including Austria, Bulgaria,
Czech Republic, Danish mainland, Estonia, Finland, French mainland,
Germany, Hungary, Italian mainland, Latvia, Lithuania, Norwegian
mainland, Poland, Russia Central, Russia Northwest, Slovakia, Slovenia,
Sweden, Switzerland, The Netherlands and Ukraine (Karsholt and
van Nieukerken in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: