The leaf and stem mines of British flies and other insects
 

(Coleoptera, Diptera, Hymenoptera and Lepidoptera)

by Brian Pitkin, Willem Ellis, Colin Plant and Rob Edmunds

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Chromatomyia blackstoniae Spencer, 1990
[Diptera: Agromyzidae]

Phytomyza gentianae Hendel, 1920; Spencer, 1972. Handbk ident. Br. Ins. 10 (5g): 95 [in part, misidentification]
Phytomyza gentianae Hendel, 1920; Griffiths, 1968. Proc. R. Irish Acad. 67(B) 2: PAGE, [misidentification]
Chromatomyia blackstoniae
Spencer, 1990. Host specialization in the World Agromyzidae (Diptera) : 180, 181, 183, 396, 405
Phytomyza blackstoniae (Spencer, 1990); Winkler, Sonja, Scheffer and Mitter, 2009.


Leaf-mine: 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).

Mine of Chromatomyia blackstoniae on Blackstonia perfoliata
Mine of Chromatomyia blackstoniae on Blackstonia perfoliata
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.

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 & Ireland:

Gentianaceae        
Blackstonia perfoliata Yellow-wort British Wild Flowers by John Somerville et al. British leafminers
Blackstonia perfoliata Yellow-wort British Wild Flowers by John Somerville et al. Spencer, 1972b: 116

Hosts elsewhere:

Gentianaceae        
Blackstonia perfoliata Yellow-wort British Wild Flowers by John Somerville et al. Spencer, 1990: 396
Blackstonia perfoliata Yellow-wort British Wild Flowers by John Somerville et al. Bladmineerders van Europa

Time of year - mines: August (Spencer, 1990).

Time of year - adults: Currently unknown.

Distribution in Great Britain & 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:

Blackstonia perfoliata

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



External links: Search the internet:
Biodiversity Heritage Library
Bladmineerders van Europa
British leafminers
Encyclopedia of Life
Fauna Europaea
NBN Atlas
NHM UK Checklist
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