Leaf mine: 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 larva is illustrated in British leafminers and Bladmineerders van Europa.

Pupa: Details unknown.

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

Hosts in Britain:

Hosts elsewhere:

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

Time of year - adults: Unknown.

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

Distribution in Great Britain & Ireland: Britain including Bedfordshire, Cheshire, Cumberland, East Kent, Herefordshire, Monmouthshire, North Wiltshire, Oxfordshire, South Lancaster, Surrey, Warwickshire, West Kent and West Suffolk (NBN Gateway - N.B. includes Watsonian Vice Counties having publicly available records that fall within or overlap the vice county border at 10km resolution or better i.e. a record for a vice county may relate to an adjacent vice county - for included datasets see NBN Grid map below).

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

NBN Grid map: Note that not all datasets on the NBN Gateway may be available on the map below. If you are an NBN Gateway registered user you can request access for missing datasets via the link 'Open interactive map in new window' below.

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 (van Achterberg in Fauna Europaea).

NBN interactive distribution map(s) of known host species in Great Britain and Ireland and elsewhere:

Parasitoids in Britain and elsewhere: Unknown.