Phytomyza
wahlgreni Rydén, 1944
[Diptera:
Agromyzidae]
Phytomyza
wahlgreni Rydén, 1944. Opusc. ent. 9:
49
Phytomyza taraxacocoecis Hering, 1949d. Notul. ent.
29: 29. [Synonymised by Spencer, 1976: 527]
Phytomyza taraxacocoecis Hering, 1949d; Spencer, 1972b. Handbk
ident. Br. Ins. 10(5g): 71, 85 (fig. 283),
87, 88, 115
Phytomyza wahlgreni Rydén, 1944; Spencer, 1976.
Fauna ent. Scand. 5(1): 527-8, figs 921-2.
Phytomyza wahlgreni Rydén, 1944; Spencer, 1990.
Host specialization in the World Agromyzidae (Diptera)
: 259, 267, 268 (figs 1011-2).
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Leaf-miner/ Galler:
Larva
feeding in the mid-rib or flower stalk where a gall-like swelling
is produced (see also Redfern
et al., 2002: 453, fig. 914). Pupation at base of leaf, near
exit hole prepared by larva prior to pupation (see also Redfern
et al., 2002: 453, figs 915).
The
larva lives in a corridor of just a few cm long within the midrib.
The leaf is stunted and the midrib is strongy swollen, gall-like.
In the end the mine turns red. Pupation within the mine, near a
previously made exit in the upper surface of 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 and Ireland:
Hosts elsewhere:
Time
of year - mines: Currently unknown.
Time
of year - adults: Currently unknown.
Distribution
in Great Britain and Ireland: Widespread, at least in south.
London (Hampstead), Hertfordshire (New Barnet), Hampshire (New Forest),
Dorset (Studland), Suffolk (Newmarket) (Spencer, 1972b: 87, as taraxacocoecis); Breconshire,. Cambridgeshire, East Cornwall, Monmouthshire, Montgomeryshire, South-west Yorkshire, West Glocestershire and
Westmorland (NBN
Atlas).
Also
recorded in the Republic of Ireland (Fauna Europaea). Distribution
elsewhere: Widespread in continental Europe from Swiss Alps to Faroe Is.,
including Denmark, Finland, Norway, Sweden (Spencer,
1976: 527), Germany (Spencer,
1976: 582), Belarus, Czech Republic, Estonia, French mainland,
Italian mainland, Lithuania and Poland (Fauna Europaea).
Also
recorded from the East Palaearctic and Nearctic Region (Fauna Europaea). NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere:
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