Larva an internal stem-borer. Pupation internal (Spencer, 1972b: 19).
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).
Posterior spiracular plates adjoining, each with a regular ellipse
of 15 bulbs around a strong central horn (Spencer, 1972b: 19).
Adult: The adult and a recorded parasitoids are illustrated by Vikberg & Malinenin, 2012. Sahlbergia 18.2: 17-23
Spencer (1966a: 21) and
Spencer (1972b: 16, 19,
111, 112) misidentifed British specimens of oligophaga as
is only known from Denmark (Spencer,
adults are virtually indistinguishable from M. dettmeri (known
only on Centaurea jacea from Denmark) with the following
essential characters: frons not projecting above eye, orbital setulae
in 2 rows, those nearest eye margin reclinate, inner row proclinate;
eye with distinct pilosity in both male and female; mesonotum normally
faintly greenish; squamae pale, margin pale brown, fringe whitish
to ochrous; wing length normally about 3 mm (Spencer,
Hosts in Great Britain & Ireland:
of year - larvae: Currently unknown.
of year - adults: May. Overwinters as puparium.
in Great Britain & Ireland: Surrey (Banstead, Betchworth
and Walton Heath); Middlesex (Scratch Wood), Cambridge (Chippenham
Fen), Derby (Miller's Dale), Denbighshire (Wrexham) and Perth (Killin)
(Spencer, 1972b: 19 (as dettmeri,
see also Spencer, 1990: 394).
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elsewhere: Holland, Germany (Spencer,
1990: 394), Belarus, Germany, Latvia and Lithuania (Martinez
in Fauna Europaea).
NBN Interactive Grid Maps of known host species:
British and Irish Parasitoids in Britain and elsewhere: