Leaf-miner: Larvae feeding in stem-leaves. particularly those immediately below
the flower; mine initially linear, later developing into irregular
blotch. Pupation internal (Spencer,
1990: 396).
Initially
a corridor, later an irregular blotch. Pupation within the mine;
puparium whitish (Bladmineerders van Europa).
The initial mine is a gallery, it later makes a lower surface blotch mine (British
leafminers).
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Mine
of Chromatomyia blackstoniae on Blackstonia perfoliata
Image: © Brian Pitkin |
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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).
Whitish (Spencer, 1990: 396).
Comments:
Spencer (1972b: 95) recorded
Chromatomyia gentianae (as Phytomyza) on Blackstonia
perfoliata and Centaurium
erythrae (as minus). However, he later (Spencer,
1990: 396-7) recognised that specimens on Blackstonia
perfoliata and specimens on Centaurium
erythrae represented two different new species, which he described
as Chromatomyia
blackstoniae and Chromatomyia
centaurii respectively.
Hosts in Great Britain and Ireland:
Hosts
elsewhere:
Time
of year - mines:
August (Spencer, 1990).
Time
of year - adults: Currently unknown.
Distribution
in Great Britain and Ireland: Gloucestershire (Kilcot) (Spencer,
1990: 396), Oxfordshire (Warburg Reserve) (British
leafminers), Surrey (Boxill) (pers. observation). Buckinghamshire (NBN
Atlas).
Also
recorded in the Republic of Ireland: Co. Clare (Murrough) (Spencer,
1990: 396). Distribution
elsewhere: Northern France (Spencer,
1990: 396).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: Currently unknown.
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