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Stem-feeder : Larvae normally feed in stems but have been found in the inflorescence (Spencer, 1972b: 68).

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 Dempewolf (2001: 179).

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).

Yellowish, elongate; posterior spiracles each with some 10 bulbs (without central horn).

Comments: Spencer (1990) accepts a Napomyza species on Linum as representing lateralis. However, more detailed studies may show that this population represents a distinct species.

Hosts in Great Britain and Ireland:

Asteraceae
Anthemis				Spencer, 1972b: 111
Bidens				Spencer, 1972b: 112
Calendula				Spencer, 1972b: 112
Dimorphotheca				Spencer, 1972b: 113
Senecio	vulgaris	Groundsel		Spencer, 1972b: 114
Tripleurospermum	maritimum x inodora			Spencer, 1972b: 113, as Matricaria

Hosts elsewhere:

Asteraceae
Anthemis				Spencer, 1976: 340
Bellis				Spencer, 1990: 274
Bidens				Spencer, 1976: 340
Calendula				Spencer, 1976: 340
Carduus				Spencer, 1976: 340
Centaurea				Spencer, 1976: 340
Centaurea				Spencer, 1990: 251
Crepis				Spencer, 1990: 265
Dimorphotheca				Spencer, 1990: 290
Helichrysum				Spencer, 1976: 340
Inula				Spencer, 1976: 340
Lactuca				Spencer, 1976: 340
Matricaria				Spencer, 1976: 340
Matricaria				Spencer, 1990: 301
Senecio				Spencer, 1990: 293
Silybum				Spencer, 1976: 340
Tripleurospermum	maritimum	Sea Mayweed		Dempewolf, 2001: 179, as Matricaria maritima
Tripleurospermum	maritimum x inodora			Spencer, 1976: 340
Linaceae				Spencer, 1976: 340
Linum				Spencer, 1990: 150

Time of year - larvae: Currently unknown.

TIme of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Widespread and common. Surrey (Richmond), London (Hampstead), Hertfordshire (Brookman's Park), Inverness (Inverness) (Spencer, 1972b: 68); Caernarvonshire, Cambridgeshire, Dumfriesshire, East Cornwall, East Kent, Fife, Glamorgan, Huntingdonshire, Monmouthshire, North Hampshire, Nottinghamshire, Pembrokeshire, Shropshire, South Essex, South-west Yorkshire, Surrey, West Kent and West Suffolk (NBN Atlas).

Also recorded in the Republic of Ireland (Martinez in Fauna Europaea).

Distribution elsewhere: Common throughout much of Europe including Denmark, Finland, Norway, Sweden (Spencer, 1976: 340), Germany (Spencer, 1976: 566; Dempewolf, 2001: 179; Spencer, 1990: 150), Austria, Azores, Belarus, Belgium, Canary Is., Czech Republic, Estonia, European Turkey, French mainland, Hungary, Italian mainland, Latvia, Lithuania, Madeira, Poland, Sicily, Spanish mainland, Switzerland and Yugoslavia (Martinez in Fauna Europaea).

Also recorded in Japan and Canada (Spencer, 1976: 340).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere:

Adult:

Wing of Napomyza lateralis