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Leaf miner: A large, upper-surface (often nearly full depth) blotch, without a hint of an initial corridor, beginning in the tip of a leaf segment. Often a well-defined the first section of the mine is much shalllower and green in transparancy. Frass in loose grains. Like H. aceris the cocoon, that is formed in the mine, drops out of the leaf along with a circular section of the upper epidermis (Bladmineerders van Europa).

The mine is also illustrated in British leafminers, as H. healyi.

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).

Like all Heterarthrus species the larva has thoracic feet that are reduced to triangular stumps (Bladmineerders van Europa).The larva is also illustrated in (British leafminers, as Heterarthrus healyi).

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

Outside the mine, inside an excised cut out disc (British leafminers, as Heterarthrus healyi).

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

Hosts in Great Britain and Ireland:

Aceraceae
Acer	campestre	Field Maple		British leafminers, as Heterarthrus healyi
Acer	campestre	Field Maple		Pitkin & Plant, as Heterarthrus healyi

Hosts elsewhere:

Aceraceae
Acer	campestre	Field Maple		Bladmineerders van Europa

Time of year - larvae: Bivoltine: summer and autumn (British leafminers, as Heterarthrus healyi).

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: Uncommon (British leafminers, as Heterarthrus healyi). Britain including North Wiltshire (NBN Atlas)

Distribution elsewhere: Widespread in continental Europe including Austria, Danish mainland, Germany, Switzerland and Ukraine (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: