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Phytomyza asteris Hendel, 1934. Fliegen palaearkt. Reg. 6(2): 352
Phytomyza asteris Hendel, 1934; Rydén, Lyneborg and Nielsen, 1963. Tovinger III. Minerfluer, Agromyzidae. Danmarks Fauna 68. 153
Phytomyza asteris Hendel, 1934; Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 71, 85 (fig. 281), 87
Chromatomyia asteris (Hendel, 1934); Spencer, 1976. Fauna ent. Scand. 5(1): 388-9, figs. 677.
Chromatomyia asteris (Hendel, 1934); Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 274, 281, 282 (fig. 1074), 283.
Phytomyza asteris Hendel, 1934; Winkler et al. 2009. Syst. ent. 34: 260-292.

Leaf-miner: Mine narrow, irregular linear; initially on lower surface but mainly upper surface. Pupation internal (Spencer, 1972b: 87).

Initially lower-surface, later upper-surface corridor, not appreciably widening towards the end. Corridor often strongly contorted. Frass in rather coarse grains, irregularly scattered. Pupation in the mine (Bladmineerders van Europa).

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 by de Meijere (1926, as Phytomyza sp. on Aster tripolium); de Meijere (1928); de Meijere (1934, as Ph. tenella) and Griffiths (1976c).

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).

Whitish; posterior spiracles each with a circle of up to 25 bulbs (Spencer, 1976: 388).

Hosts in Great Britain and Ireland:

Asteraceae
Aster	tripolium	Sea Aster		Bland, 1994
Aster	tripolium	Sea Aster		Mines in BMNH
Aster	tripolium	Sea Aster		Spencer, 1972b: 111

Hosts elsewhere:

Asteraceae
Aster	tripolium	Sea Aster		Spencer, 1976: 388
Aster	tripolium	Sea Aster		Spencer, 1990: 281
Aster	tripolium	Sea Aster		Bladmineerders van Europa

Time of year - mines: July-October.

Time of year - adults: July or January the following year.

Distribution in Great Britain and Ireland: Widespread around coasts. Records for Britain include Kent (Faversham) (Spencer, 1972b: 87), Stirling (Higginsneuk) and North Uist (Oban Trumisgarry) (Bland, 1994c: 83) and East Kent, East Suffolk, Glamorgan, North Essex, West Norfolk and Westmorland (NBN Atlas).

Also recorded in the Republic of Ireland: Co. Clare (Dunratty and Poulnaclough Bay) and Co. Down (Corlingford Loch) (Spencer, 1972b: 87).

Distribution elsewhere: Widespread in continental Europe including Denmark, France, Germany (Spencer, 1976: 388), The Netherlands, Belgium (Kabos, 1971; Collart, 1942), Czech Republic, Poland, Slovenia and Sweden (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: