The leaf and stem mines of British flies and other insects

(Coleoptera, Diptera, Hymenoptera and Lepidoptera)

by Brian Pitkin, Willem Ellis, Colin Plant and Rob Edmunds

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Agromyza igniceps Hendel, 1920
[Diptera: Agromyzidae]

Agromyza igniceps Hendel, 1920. Arch. Naturgesch. 84A(7)(1918): 122
Agromyza igniceps Hendel, 1920; Hendel, 1931. Fliegen palaearkt. Reg. 6(2): 124
Agromyza humuli Hering, 1924b. Zeitschrift für Morphologie und Ökologie der Tiere. 2: 235
Agromyza igniceps Hendel, 1920; Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 35, 110
Agromyza igniceps Hendel, 1920; Spencer, 1976. Fauna ent. Scand. 5(1): 114-115, figs 184-6.
Agromyza igniceps Hendel, 1920; Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 53, 55, 56 (fig. 204).

Leaf-mine: A linear leaf-mine, widening irregularly; frass in two conspicuous black strips (Spencer, 1972b: 35, fig. 186).

Long, narrow, little widening corridor, often following a vein for a considerable distance. The thin leaves easily tear here, also because the mine is relatively deep. Frass in two neat rows of grains along the sides. Pupation outside the mine; unlike A. flaviceps on the same hostplant, the exit slit is in the upper epidermis (Bladmineerders van Europa).

A short, irregular narrow gallery. Frass in conspicuous black stripes (British leafminers).

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 white larva is described by de Meijere (1925) and in Bladmineerders van Europa ; posterior spiracles each with 3 bulbs on a large conical projection (Spencer, 1976: 114).

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).

Hosts in Great Britain & Ireland:

Humulus lupulus Hop British Wild Flowers by John Somerville et al. Mines in BMNH
Humulus lupulus Hop British Wild Flowers by John Somerville et al. British leafminers
Humulus lupulus Hop British Wild Flowers by John Somerville et al. Spencer, 1972b: 110

Hosts elsewhere:

Humulus       Spencer, 1990: 53
Humulus lupulus Hop British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Humulus lupulus Hop British Wild Flowers by John Somerville et al. Spencer, 1976: 110

Time of year - mines: June.

Time of year - adults: Currently unknown.

Distribution in Great Britain & Ireland: Kent (Sittingbourne) and Hampshire (Isle of Wight) (Spencer, 1972b: 35) and Worcestershire (VC37) (NBN Gateway).

NBN Grid Map:

NBN Grid Map

Agromyza igniceps
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Distribution elsewhere: Widespread in continental Europe including Denmark, Finland, Norway, Sweden (Spencer, 1976: 114), The Netherlands (Bladmineerders van Europa), Germany (Spencer, 1976: 546), Austria, Czech Republic, Poland and Slovakia (Martinez in Fauna Europaea).

NBN Interactive Grid Maps of known host species:

Humulus lupulus

British and Irish Parasitoids in Britain and elsewhere: Currently unknown.

External links: Search the internet:
Biodiversity Heritage Library
Bladmineerders van Europa
British leafminers
Encyclopedia of Life
Fauna Europaea
NBN Gateway
NHM UK Checklist
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