Leaf mine: 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: 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: 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 Britain:

Hosts elsewhere:

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

Time of year - adults: Unknown.

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

Distribution in Great Britain & Ireland: Uncommon (British leafminers, as Heterarthrus healyi). Britain including North Wiltshire (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)

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 including Austria, Danish mainland, Germany, Switzerland 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.