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


Fenusa ulmi Sundevall, 1847
[Hymenoptera: Tenthredinidae]

Fenusa ulmi Sundevall, 1847.

Leaf miner: Very clear blotch, containing a yellow white larva. The final mine may occupy a sizable part of the leaf. The mine usually starts in a vein axil, never at the leaf margin (Liston, 1994a); in large leaves the mine remains confined between to lateral veins. Frass in black grains, initially often in long pearl chains, in older mines in loose grains. (Bladmineerders van Europa).

The mine is also illustrated in British leafminers.

Larva: The larvae of sawflies have a head capsule, chewing mouthparts with opposable mandibles, six thoracic legs and abdominal legs (although they may be reduced) (see examples).

Normally the larva lies venter-upwards in the mine. The small warts on segment 9, and frontal of the rearmost prolegs, are practically unpigmented in some specimens! (Bladmineerders van Europa.

Pupa: The pupae of sawflies have visible head appendages, wings and legs which lie in sheaths.

Adult: Details unknown.

Hosts in Great Britain and Ireland:

Ulmus       British leafminers

Hosts elsewhere:

Ulmus americana     Bladmineerders van Europa
Ulmus elliptica     Bladmineerders van Europa
Ulmus x hollandica     Bladmineerders van Europa
Ulmus minor   British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Ulmus rubra     Bladmineerders van Europa

Time of year - larvae: Mines in May-June, sometimes numerous (Bladmineerders van Europa).

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Widespread in Britain incluidng Caernarvonshire, Cambridgeshire, Denbighshire, Derbyshire, East Gloucestershire, East Kent, East Ross, Easterness, Flintshire, Glamorgan, Leicestershire, Main Argyll, Mid-west Yorkshire, North-west Yorkshire, Nottinghamshire, South-east Yorkshire, South-west Yorkshire, Surrey, West Gloucestershire, West Ross and Westlmorland (NBN Atlas)

Distribution elsewhere: Widespread in continental Europe including Austria, Belgium, Croatia, Czech Republic, Estonia, Finland, French mainland, Germany, Italian mainland, Latvia, Poland, Slovakia, Sweden, Switzerland, and Ukraine (Fauna Europaea).

British and Irish Parasitoids in Britain and elsewhere:

Ichneumonoidea - Links to species no longer available  
Coloneura stylata Förster, 1862 Braconidae: Alysiinae
Shawiana catenator (Haliday, 1836) Braconidae: Exothecinae
Xenarcha lustrator (Haliday, 1836) Braconidae: Exothecinae
Lathrolestes pictilis (Holmgren, 1857) Ichneumonidae: Euryproctinae

External links: Search the internet:
Biodiversity Heritage Library
Bladmineerders van Europa
British leafminers
Encyclopedia of Life
Fauna Europaea
NBN Atlas
NHM UK Checklist
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Last updated 18-Oct-2019  Brian Pitkin Top of page