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Agromyza reptans Fallén, 1823a. Agromyzides Sveciae : 3
Agromyza reptans Fallén, 1823a; Nowakowski, 1964. Dt. ent. Z. [2] 11: 188
Agromyza reptans Fallén, 1823a; Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 32, 34 (fig. 90), 35, 121
Agromyza reptans Fallén, 1823a; Spencer, 1976. Fauna ent. Scand. 5(1): 137-139, figs 244-6.
Agromyza reptans Fallén, 1823a; Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 54, 55, 57, 58 (fig. 214), 79.

Leaf-miner: Mine generally follows the leaf margin, widening from the initial linear section into an irregular broad blotch; it is dark green when fresh but quickly turns blackish (Spencer, 1972b: 34 (fig. 90); Spencer, 1976: 138-9, fig. 246).

Full depth corridor that mostly starts near the leaf margin, and never begins with a series in close, intestine-like curves. Further on the corridor strongly widens, and usually remains close to the leaf margin. Often several larvae in a mine. Frass in lumps or short rods, never in long threads (Bladmineerders van Europa).

Larva: The larvae of flies are leg-less maggots without a head capsule (see examples). They never have thoracic or abdominal legs. They do not have chewing mouthparts, although they do have a characteristic cephalo-pharyngeal skeleton (see examples), usually visible internally through the body wall.

The larva is described by Dempewolf (2001: 49) and illustrated in Bladmineerders van Europa.

Puparium: The puparia of flies are formed within the hardened last larval skin or puparium and as a result sheaths enclosing head appendages, wings and legs are not visible externally (see examples).

Reddish-brown; posterior spiracles each with 3 bulbs (Spencer, 1976: 139).

Hosts in Great Britain and Ireland:

Urticaceae
Urtica				Robbins, 1991: 71
Urtica	dioica	Common Nettle		Mines in BMNH
Urtica	dioica	Common Nettle		Spencer, 1972b: 121

Hosts elsewhere:

Urticaceae
Cannabis				Spencer, 1976: 139
Cannabis	sativa	Hemp		Bladmineerders van Europa
Humulus				Spencer, 1976: 139
Mentzelia				Spencer, 1976: 139
Parietaria				Spencer, 1976: 139
Parietaria				Bladmineerders van Europa
Urtica				Spencer, 1976: 139
Urtica				Spencer, 1990: 54
Urtica	dioica	Common Nettle		Dempewolf, 2001: 49
Urtica	dioica	Common Nettle		Bladmineerders van Europa

Time of year - mines: June-September.

Time of year - adults: July.

Distribution in Great Britain and Ireland: Widespread in Britain including London (Hampstead), Isle of Wight, Cornwall (Helston), Suffolk (Barton Mills and Newmarket), Yorkshire (Ingleborough), Invernes (Loch Morlich) (Spencer, 1972b: 35), Warwickshire (Coventry and Keresley) (Robbins, 1991: 71), Cambridgeshire, Dumfriesshire, East Gloucestershire, East Suffolk, Glamorgan, Isle of Wight, Mid-west Yorkshire, Monmouthshire, North Somerset, Nottinghamshire, Shropshire, South Somerset, South-west Yorkshire, Stafford, Surrey, Warwickshire, West Gloucestershire and West Suffolk (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe including Denmark, Norway, Sweden, Germany, Poland, Estonia, Latvia (Spencer, 1976: 129), The Netherlands (Bladmineerders van Europa), Belgium (de Bruyn and von Tschirnhaus, 1991), Czech Republic, European Turkey, French mainland, Hungary, Italian mainland, Latvia, Lithuania, Republic of Moldova, Sardinia, Slovakia and Switzerland (Fauna Europaea). Also recorded in Canada (Spencer, 1969a: 35).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: