xanthaspis (Loew, 1858)
xanthaspis Loew, 1858. Wien. ent. Mschr. 2:
Agromyza xanthaspis Loew, 1858; Hendel, 1932. Fliegen
palaearkt. Reg. 6(2): 264
Metopomyza xanthaspis (Loew, 1858); Spencer, 1972. Handbk
Ident. Br. Insects X 5(g): 60, 122
Metopomyza xanthaspis (Loew, 1858); Spencer, 1976. Fauna
ent. Scand. 5(1): 290, fig. 523.
Metopomyza xanthaspis (Loew, 1858); Spencer, 1990. Host
specialization in the World Agromyzidae (Diptera) : 347, 348
(fig. 1312), 351.
Mine initially lower surface running towards the apex, later continuing
down towards the leaf base on the upper surface (developing into
a broad blotch, with frass scattered irregularly). Pupation external
(Spencer, 1972b: 60).
mine begins as a very narrow lower-surface corridor running in the
direction of the leaf tip. Close to the tip the mine becomes upper-surface
and redescends towards the leaf base, widening meanwihle, until
all space between the midrib and a leaf margin is occupied. In the
later parts of the mine frass in relatively coarse irregular grains.
Pupation outside the mine (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.
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:
of year - mines: Currently unknown.
of year - adults: June.
in Great Britain & Ireland: Widespread in Britain including
Suffolk (Barton Mills), Inverness (Cairgorms, Riach, Devil's Ditch)
(Spencer, 1972b: 60); Glamorgan
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elsewhere: Widespread in western Europe including Denmark, Finland,
Sweden (Spencer, 1976: 291),
The Netherlands (Bladmineerders van Europa), Belgium (Scheirs,
de Bruyn and von Tschirnhaus, 1995), Germany (Spencer,
1976: 562), Austria, Croatia, Czech Republic, Estonia, French
mainland, Hungary, Latvia, Lithuania, Poland, Slovakia, Spanish
mainland and Switzerland (Martinez in Fauna Europaea).
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British and Irish Parasitoids in Britain and elsewhere: