Underground stem feeder:
Chyliza extenuata is said to live in the swollen underground stem of Orobanche rapum-genistae Thuill., a perennial root parasite of leguminous shrubs, especially Ulex europaeus >and Cytisus scoparius, but also known to occur occasionally on Genista tinctoria> in Britain (Collin, 1944. Ent. mon. Mag. 80: 214-224.). It is not known whether it mines or not.
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:
elsewhere: Currently unknown.
of year - mines: Currently unknown.
of year - adults: Currently unknown (check for update)
in Great Britain & Ireland: Hampshire, Surrey (VC17), Suffolk and County Wicklow (Collin, 1944). (NBN
Also recorded in the Republic of Ireland (Pape, 2004 in Fauna Europaea).
Distribution elsewhere: Andorra, Czech Republic, Gemany, Hungary, Italian mainland, Portuguese mainalnd, Sicily, Slovakia, Spanish mainland, Switzerland (Pape, 2004 in Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.