The leaf and stem mines of British flies and other insects
 

(Coleoptera, Diptera, Hymenoptera and Lepidoptera)

by Brian Pitkin, Willem Ellis, Colin Plant and Rob Edmunds

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Stigmella svenssoni (Johansson, 1971)
[Lepidoptera: Nepticulidae]

Orange-headed Pigmy


Nepticula svenssoni Johansson, 1971. Ent. Scand. 2: 249, fig'd.
Stigmella svenssoni
(Johansson, 1971).


Leaf-miner: The larval mine is a long gallery with linear black frass to begin with, subsequently neatly scattered, and finally more central and irregular. The egg is usually laid on the underside of the leaf (UKMoths).

Forms a long, relatively wide mine. The frass is initially in a thin central line, but later may vary from a thin central line to frass almost filling the mine (British leafminers).

Oviposition at the underside of the leaf. The mine is a remarkably long, not very slender corridor. Frass line of inconstant width, mostly occupying more than half the width of the gallery (Bladmineerders van Europa).

It is recommended that you try to rear out the adults to be certain of their identity.

Mine of Stigmella svenssoni on Quercus

Mine of Stigmella svenssoni on Quercus
Image: © Guy Meredith (British leafminers)

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).

Yellow, head brown (Borkowski, 1972b; Gustafsson and van Nieukerken (1990a). Abdomen 9 with two pairs of setae (other species, as far as known, having three pairs) (Bladmineerders van Europa).

Pupa: The pupae of moths have visible head appendages, wings and legs which lie in sheaths (see examples).

Adult: The adult is illustrated in UKMoths. The male genitalia, but not the female genitalia (check for update), are not illustrated by the Lepidoptera Dissection Group.

Hosts in Great Britain & Ireland:

Fagaceae        
Quercus       UKMoths
Quercus petraea Sessile Oak British Wild Flowers by John Somerville et al. Pitkin & Plant
Quercus robur Pedunculate Oak British Wild Flowers by John Somerville et al. Pitkin & Plant

Hosts elsewhere:

Fagaceae        
Quercus petraea Sessile Oak British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Quercus robur Pedunculate Oak British Wild Flowers by John Somerville et al. Bladmineerders van Europa

Time of year - larvae: July to September (UKMoths).

Time of year - adults: Thought to be only a single extended generation, adults in May and June (UKMoths).

Distribution in Great Britain & Ireland: Britain including Berkshire, East Kent, East Norfolk, East Ross, East Suffolk, East Sutherland, Glamorgan, Huntingdonshire, North Aberdeen, North Devon, North Essex, Shropshire, South Aberdeen, South Essex, South Hampshire, South Wiltshire, Stafford, West Norfolk, West Ross, West Suffolk, West Sutherland and Worcestershire (NBN Atlas). See also British leafminers distribution map.

Also doubtfully recorded in the Republic of Ireland (Karsholt and van Nieukerken in Fauna Europaea). See also Ireland's NBDC interactive map.

Distribution elsewhere: Widespread in continental Europe including Danish mainland, Finland, French mainland, Germany, Greek mainland, Hungary, Italian mainland, Latvia, Norwegian mainland, Slovakia, Sweden and The Netherlands (Karsholt and van Nieukerken in Fauna Europaea).

NBN Atlas links to known host species:

Quercus petraea, Quercus robur

British and Irish Parasitoids in Britain and elsewhere: Currently unknown.



External links: Search the internet:
Belgian Lepidoptera
Biodiversity Heritage Library
Bladmineerders van Europa
British leafminers
Encyclopedia of Life
Fauna Europaea
NBN Atlas
NHM UK Checklist
UKMoths
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Last updated 11-May-2017  Brian Pitkin Top of page