Stem-feeder:
Spencer (1972b) recorded anteposita as an 'external stem miner (report
as stem-borer on Galium molluga inaccurate)'. However, he
later stated that the species was an 'internal stem-feeder' (Spencer,
1990: 235).
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 - larvae: Currently unknown.
Time
of year - adults: June.
Distribution
in Great Britain and Ireland: Widespread in Britain including
Kent (Darenth), Middlesex (Scratch Wood) and Dunbartonshire (Bonhill)
(Spencer, 1972b: 64); Cambridgeshire
and Dumfriesshire (NBN
Atlas). Distribution
elsewhere: Europe (Spencer,
1990: 235) including Austria, Balearic Is, Belgium, Canary Is.,
Croatia, Czech Republic, Denmark, French mainland, Germany, Poland,
Slovakia, Switzerland and The Netherlands (Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.
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