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

N.B. Links to the latest version of 'Leafminers and plant galls of Europe' are being edited

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Nemorimyza posticata (Meigen, 1830)
[Diptera: Agromyzidae]


Agromyza posticata Meigen, 1830. Syst. Beschr. 6: 172
Agromyza posticata Meigen, 1830; Hendel, 1931. Die Fliegen Pal. Reg. 59: 30
Agromyza posticata Meigen, 1830; Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 62 (fig. 205), 67, 112, 114
Nemorimyza posticata (Meigen, 1830); Spencer, 1976. Fauna ent. Scand. 5(1): 308-9, figs 556-7.
Nemorimyza posticata (Meigen, 1830); Spencer, 1990. Host specialization in the World Agromyzidae (Diptera) : 271, 273, 274, 275, 278 (figs 1047-8), 293.


Leaf-mine: A large, brownish blotch, with conspicuous feeding lines. Pupation external (Spencer, 1972b: 62 (fig. 205), 63; Spencer, 1976: 308, 309 (fig. 557)).

Large, brown, upper-surface blotch with conspicuous primary and secondary feeding lines. The feeding lines are the more apparent because the semiliquid frass adheres to them. Pupation outside the mine; exit slit in the upper epidermis (Bladmineerders van Europa).

A short broad gallery, normally at the margin, leading to a blotch with obvious feeding lines in whorls. Mines go brown (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 larva is described by de Meijere (1925), Sasakawa (1961) and Dempewolf (2001: 93). The larva is 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 on conspicuous projections, each with 3 small bulbs (Spencer, 1976: 308).

Hosts in Great Britain & Ireland:

Asteraceae        
Solidago       Mines in BMNH
Solidago       Robbins, 1991: 112
Solidago canadensis Canadian Goldenrod British Wild Flowers by John Somerville et al. British leafminers
Solidago canadensis Canadian Goldenrod British Wild Flowers by John Somerville et al. Mines in BMNH
Solidago canadensis Canadian Goldenrod British Wild Flowers by John Somerville et al. Spencer, 1972b: 114
Solidago canadensis Canadian Goldenrod British Wild Flowers by John Somerville et al. Mines in BMNH
Solidago virgaurea Goldenrod British Wild Flowers by John Somerville et al. British leafminers
Solidago virgaurea Goldenrod British Wild Flowers by John Somerville et al. Spencer, 1972b: 114

Hosts elsewhere:

Asteraceae        
Aster       Spencer, 1976: 308
Aster       Spencer, 1990: 274
Aster amellus European Michaelmas-daisy   Bladmineerders van Europa
Aster bellidiastrum     Bladmineerders van Europa
Baccharis       Spencer, 1976: 308
Baccharis       Spencer, 1990: 274
Buphthalmum       Spencer, 1990: 273
Buphthalmum salicifolium Willow-leaved Yellow Oxeye   Bladmineerders van Europa
Erechtites       Spencer, 1990: 293
Solidago       Spencer, 1990: 264
Solidago       Dempewolf 2001: 93
Solidago canadensis Canadian Goldenrod British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Solidago canadensis Canadian Goldenrod British Wild Flowers by John Somerville et al. Spencer, 1976: 308
Solidago canadensis Canadian Goldenrod British Wild Flowers by John Somerville et al. Dempewolf 2001: 93
Solidago gigantea Early Goldenrod British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Solidago virgaurea Goldenrod British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Solidago virgaurea Goldenrod British Wild Flowers by John Somerville et al. Spencer, 1976: 308

Time of year - mines: June-October.

Time of year - adults: Currently unknown.

Distribution in Great Britain & Ireland: Widespread in south, but local. Kent (Darenth), London (Hampstead), Hertfordshire (Barnet) (Spencer, 1972b: 67); Denbighshire, Merioneth and West Gloucestershire (NBN Atlas).

Also recorded in the Republic of Ireland: Co. Clare (Glengariff) and Kerry (Killarney) (Spencer, 1972b: 67).

Distribution elsewhere: Widespread in continental Europe, including Denmark, Finland, Norway, Sweden (Spencer, 1976: 308), The Netherlands, Belgium, Luxembourg (Bladmineerders van Europa), Germany (Spencer, 1976: 562; Dempewolf 2001: 93), Austria, Belarus, Czech Republic, Estonia, French mainland, Hungary, Italian mainland, Lithuania, Poland and Spanish mainland (Martinez in Fauna Europaea).

Also recorded in Japan, Canada, the U.S.A. and Costa Rica (Spencer, 1976: 308).

NBN Atlas links to known host species:

Buphthalmum salicifolium, Solidago canadensis, Solidago gigantea, Solidago virgaurea

British and Irish Parasitoids in Britain and elsewhere:

Chalcidoidea   
Chrysocharis crassiscapus (Thomson, 1878) Eulophidae: Entedoninae
Chrysocharis viridis (Nees, 1934) Eulophidae: Entedoninae
Ichneumonoidea  
Apodesmia posticatae (Fischer, 1957) Braconidae: Opiinae
Apodesmia saeva (Haliday, 1837) Braconidae: Opiinae
Opius ambiguus Wesmael, 1835 Braconidae: Opiinae
Phaedrotoma reptantis (Fischer, 1957) Braconidae: Opiinae


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