Leaf mine: A large upper-surface (often almost full depth) blotch, without a trace of an initial corridor, beginning in the very tip of a leaf segment. The full grown larva spins itself a disc shaped cocoon within the mine. Just before, it has made a circle of perforations in the upper epidermis with its mandibles. The cocoon is formed, attached to the upper epidermis, and the larva becomes immobile. The perforated circle of epidermis starts to dry, warps, and finally becomes detached from the surrounding tissue and drops to the ground. The resulting excision has a diameter of about 7 mm, and is best seen when the leaf is held against the light (Bladmineerders van Europa).

The mine is also illustrated in British leafminers.

Larva: The larva is illustrated in British leafminers. Like all Heterarthrus species the thoracic feet are reduced to small stumps (Bladmineerders van Europa).

Pupa: Unknown.

Adult: Details unknown.

Hosts in Britain:

Hosts elsewhere:

Time of year - larvae: Univoltine: early summer (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: Widespread in England including Bedfordshire, Berkshire, Buckinghamshire, Cumberland, Middlesex, North Wiltshire, North-west Yorkshire, South Wiltshire, South-east Yorkshire, South-west Yorkshire, Surrey, Warwickshire, West Lancaster, Westmorland and Worcestershire (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 including Austria, Corsica, Croatia, Czech Republic, French mainland, Germany, Italian mainland, Poland, Sweden, ? 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.