autumnalis Griffiths, 1959
autumnalis Griffiths, 1959. Entomologist's Gaz. 10:
Phytomyza autumnalis Griffiths, 1959; Spencer, 1972b. Handbk
ident. Br. Ins. 10(5g): 88, 112, 113
Phytomyza autumnalis Griffiths, 1959; Spencer, 1990. Host
specialization in the World Agromyzidae (Diptera) : 251, 255.
long, distinctly greenish. Pupation in mine (Spencer, 1972b: 88).
upper-surface corridor, with very irregular sides. Frass in isolared
grains, maximally only 4 times their diameeter apart. Pupation within
the mine (Bladmineerders van Europa).
of Phytomyza autumnalis on Centaurea nigra (Spencer
Image: © Brian Pitkin
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.
Posterior spiracles with 19-25 bulbs on long horns with bases that are wide and touching each other (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).
White in early generations and black and shiny in autumn (Spencer,
1976: 504), posterior spiracles each with 20-25 bulbs (Griffiths,
Opaque, metallic black, in a pupariuml chamber (Griffiths, 1959a); the anterior spiracles penetrate the epidermis (Hering, 1957a) (Bladmineerders van Europa).
Spencer (1972b: 88) suggested
that the miner on Centaurea may be distinct from that on
Cirsium even though the male genitalia appear to be identical.
Hosts in Great Britain & Ireland:
of year - mines: October-November (Spencer,
of year - adults: Currently unknown.
in Great Britain & Ireland: Common and widespread (Spencer, 1972b: 88) including Warwickshire (Robbins,
recorded in the Republic of Ireland: Co. Tipperary (Tipperary) (Spencer, 1972b: 88).
Distribution elsewhere: Widespread in continental Europe including Germany (Bladmineerders van Europa), Republic of Moldova and Poland (Martinez in Fauna Europaea).
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