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Leaf miner: A large, practically full depth brownish blotch, without an initial corridor. The mine begins somewhere on the leaf and expands in all directions, without having much consideration with even major veins. In this respect the mine differs from that of Fenusa dohrnii on the same host plant. Moreover, as a rule there is just one mine per leaf. The full grown larva makes a disc-shaped cocoon within its mine, with a diameter of about 7-9 mm. Unlike F. dohrnii the larva is rather vividly pigmented and can easily be observed without dissecting the mine. Like most sawflies the larva lies belly-up in its mine (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).

The larva is illustrated in British leafminers and Bladmineerders van Europa.

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

Adult: The adult is illustrated in ECatSym - Electronic World Catalog of Symphyta.

Hosts in Great Britain and Ireland:

Salicaceae
Alnus	cordata	Italian Alder		British leafminers
Alnus	cordata	Italian Alder		Pitkin & Plant
Alnus	glutinosa	Alder		British leafminers
Alnus	glutinosa	Alder		Pitkin & Plant
Alnus	incana	Grey Alder		Pitkin & Plant

Hosts elsewhere:

Salicaceae
Alnus	cordata	Italian Alder		Bladmineerders van Europa
Alnus	glutinosa	Alder		Bladmineerders van Europa
Alnus	incana	Grey Alder		Bladmineerders van Europa
Alnus	minor			Bladmineerders van Europa
Alnus	x spaethii			Bladmineerders van Europa

Time of year - larvae: Univoltine: autumn (British leafminers).

Time of year - adults: Currently unknown.

Comments: Full synonymy and references are listed in ECatSym - Electronic World Catalog of Symphyta.

Distribution in Great Britain and Ireland: Britain including Bedfordshire, Cheshire, Cumberland, East Kent, Herefordshire, Monmouthshire, North Wiltshire, Oxfordshire, South Lancashire, Surrey, Warwickshire, West Kent and West Suffolk (NBN Atlas).

Also recorded in the Republic of Ireland (Fauna Europaea).

Distribution elsewhere: Widespread in continental Europe Austria, Belgium, Bulgaria, Corsica, Czech Republic, Danish mainland, Estonia, Finland, French mainland, Germany, Hungary, Italian mainland, Latvia, Luxembourg, Poland, Romania, Russia - Central, Slovakia, Spanish mainland, Sweden, Switzerland, The Netherlands and Ukraine (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: