posticata (Meigen, 1830)
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)).
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
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,
Hosts in Great Britain & Ireland:
of year - mines: June-October.
of year - adults: Currently unknown.
in Great Britain & Ireland: Widespread in south, but local.
Kent (Darenth), London (Hampstead), Hertfordshire (Barnet) (Spencer, 1972b: 67); North Somerset and West Gloucestershire (NBN
recorded in the Republic of Ireland: Co. Clare (Glengariff) and
Kerry (Killarney) (Spencer, 1972b: 67).
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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).
recorded in Japan, Canada, the U.S.A. and Costa Rica (Spencer,
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: