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Cheilosia semifasciata Becker, 1894. Nova Acta Acad. Leop. Carol. 62(3): 443
Chilosia alpina Strobl, 1898. Mitt. naturw. Ver. Steierm. 34: 225.

Leaf-miner: Full depth mine; in parts of the mine the parenchyma remain untouched. The larva enters and exits the leaf by means of an oval opening of 3-5 mm at the base, near the leaf edge. Pupation external (Bladmineerders van Europa).

Forms a deep mine with plentiful frass. The larva changes leaves entering and leaving near the leaf edge (British leafminers).

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.

The larva is described Rotheray (1988) and Stuke (2000). Posterior spiracles on a large common black spot; mandible with one tooth (Bladmineerders van Europa).

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).

Comments: Chandler (1978) did not indicate whether his host records were British or Foreign and are therefore tentatively included under 'Hosts in Britain' and 'Hosts elsewhere'.

Hosts in Great Britain and Ireland:

Crassulaceae
? Sedum	telephium	Orpine		Chandler, 1978: 221
Sedum	telephium	Orpine		British leafminers
? Umbilicus				Chandler, 1978: 221
Umbilicus	rupestris	Navelwort		British leafminers

Hosts elsewhere:

Crassulaceae
Sedum				Hering, 1957
Sedum	rosea			Bladmineerders van Europa, as Rhodiola rosea
? Sedum	telephium	Orpine		Chandler, 1978: 221
Sedum	telephium	Orpine		Bladmineerders van Europa
? Umbilicus				Chandler, 1978: 221
Umbilicus				Hering, 1957
Umbilicus	rupestris	Navelwort		Bladmineerders van Europa
Saxifragacae
Saxifraga	rotundifolia	Round-leaved Saxifrage		Bladmineerders van Europa

Time of year - mines: May - June (British leafminers).

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Recorded in the Republic of Ireland (Speight, 2004 in Fauna Europaea). Also Beltany approach path, Raphoe, Co. Donegal (British leafminers).

Distribution elsewhere: Widespread in continental Europe including The Netherlands and Belgium (van der Goot, 1981; Verlinden, 1991), Austria, Bosnia and Herzegovina, Bulgaria, Czech Republic, Finland, French mainland, Germany, Greek mainland, Hungary, Italian mainland, Luxembourg, Macedonia, Norwegian mainland, Poland, Romania, Slovakia, Sweden, Switzerland and Yugoslavia (Speight, 2004 in Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: Currently unknown.