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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Hexomyza schineri (Giraud, 1861)
[Diptera: Agromyzidae]

Sallow stem galler


Agromyza schineri Giraud, 1861. Verh. zool.-bot. Ges. Wien 11: 484
Agromyza schineri Giraud, 1861; Hendel, 1931. Fliegen palaearkt. Reg. 6(2): 162
Hexomyza schineri (Giraud, 1861); Spencer, 1966. Beitr. Ent. 16: 42
Hexomyza schineri (Giraud, 1861); Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 14 (figs 11-13), 15, 118-120
Hexomyza schineri (Giraud, 1861); Spencer, 1976. Fauna ent. Scand. 5(1): 37, figs 11-14
Hexomyza schineri (Giraud, 1861); Spencer, 1990. Host specialization in the World Agromyzidae (Diptera) : 80 (fig. 295), 81, 93.


Gall: An oval twig gall up to 10 mm long (Redfern et al, 2002: 387, fig 588), sometimes several arranged spirally around twig each containing one larva.

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.

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).

Yellowish grey to brown (Redfern et al, 2002: 387, fig 589); posterior spiracles on short stalks, each with three minute bulbs (Spencer, 1972b: 14 (fig. 13), 15).

Adults: The adults, including the halteres, are uniformly black, as in other British species of Hexomyza.

Hosts in Great Britain & Ireland:

Salicaceae        
Populus nigra Black-poplar British Wild Flowers by John Somerville et al. Robbins, 1983: 24
Populus nigra Black-poplar British Wild Flowers by John Somerville et al. Spencer, 1972b: 119
Populus tremula Aspen British Wild Flowers by John Somerville et al. Spencer, 1972b: 120

Hosts elsewhere:

Salicaceae        
Populus       Spencer, 1990: 81
Populus tremuloides American Aspen   Spencer, 1990: 81

Time of year - galls: May-June.

Time of year - adults: Currently unknown.

Distribution in Great Britain & Ireland: Hertfordshire (Hoddesdon) (Spencer, 1972: 15), Warwickshire (Coventry) (Robbins, 1983: 23) and Surrey (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe including Austria, Germany, France, Spain (Spencer, 1976: 37), Belgium, Italian mainland and Poland (Martinez in Fauna Europaea).

Also recorded in Canada from New Brunswick to British Columbia (Spencer, 1969a: 81) and in the U.S.A. from Washington State to New Mexico (Spencer, 1990: 81).

NBN Atlas links to known host species:

Populus nigra, Populus tremula, Populus tremuloides

British and Irish Parasitoids in Britain and elsewhere:

Chalcidoidea  
Entedon diotimus Walker, 1839 Eulophidae: Entedoninae
Ichneumonoidea  
Chorebus gedanensis (Ratzeburg, 1852) Braconidae: Alysiinae


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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