wahlgreni Rydén, 1944
wahlgreni Rydén, 1944. Opusc. ent. 9:
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).
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).
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 & Ireland:
of year - mines: Currently unknown.
of year - adults: Currently unknown.
in Great Britain & Ireland: Widespread, at least in south.
London (Hampstead), Hertfordshire (New Barnet), Hampshire (New Forest),
Dorset (Studland), Suffolk (Newmarket) (Spencer, 1972b: 87, as taraxacocoecis); Cambridgeshire (VC29), East Cornwall (VC2),
East Sussex (VC14), Glamorganshire (VC41), Monmouthshire (VC35), West Kent (VC16), West Sussex (VC13) and
recorded in the Republic of Ireland (Martinez in Fauna Europaea).
NBN Grid Map:
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 (Martinez in Fauna Europaea).
recorded from the East Palaearctic and Nearctic Region (Martinez
in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: