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,
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 - larvae: Currently unknown.
of year - adults: June.
in Great Britain & Ireland: Widespread in Britain including
Kent (Darenth), Middlesex (Scratch Wood) and Dunbarton (Bonhill)
(Spencer, 1972b: 64); Cambridgeshire,
Shropshire, Stafford and Worcestershire (NBN
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 (Martinez in Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.