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 centaurii Spencer, 1990
[Diptera: Agromyzidae]

Phytomyza gentianae Hendel, 1920; Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 95 [in part, misidentification].
Chromatomyia centaurii Spencer, 1990. Host specialization in the World Agromyzidae (Diptera) : 180, 181, 183, 397.
Phytomyza gentianae Hendel, 1920; Winkler et al. 2009. Syst. ent. 34: 260-292.


Leaf-mine: Mine linear in first instar, later developing into a blotch which is frequently at base of leaf. Pupation internal (Spencer, 1990: 397).

The mine starts as a gallery, but this is engulfed by the upper surface blotch that eventually forms. This mine is in a basal leaf - right on the ground amongst the grasses etc. The mine is usually in basal part of leaf. The larva pupariumtes in the mine and the spiracles protrude through the upper epidermis (British leafminers).

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: 397).

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 centaurii and Chromatomyia blackstoniae respectively.

Godfray, 2015 recorded Chromatomyia centaurii (as Phytomyza centaurii) on Gentiana tibetica purchased from a nursery in southern Scotland in early 2011 and planted in his garden near Goring Heath, Oxfordshire.

Hosts in Great Britain & Ireland:

Gentianaceae        
Centaurium       Robbins, 1991: 96
Centaurium erythraea Common Centaury British Wild Flowers by John Somerville et al. Spencer, 1972b: 116, as gentianae, in part
Centaurium erythraea Common Centaury British Wild Flowers by John Somerville et al. Spencer, 1990: 397
Centaurium erythraea Common Centaury British Wild Flowers by John Somerville et al. British leafminers
Gentiana tibetica Godfray, 2015

Hosts elsewhere:

Gentianaceae        
Centaurium erythraea Common Centaury British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Centaurium erythraea Common Centaury British Wild Flowers by John Somerville et al. Spencer, 1990: 397

Time of year - mines: July (British leafminers).

Time of year - adults: Currently unknown.

Distribution in Great Britain & Ireland: Widespread in southern England including Middlesex (Scratch Wood); Surrey (Box Hill) (Spencer, 1972b: 116, as gentianae, in part; Spencer, 1990: 397), Bedfordshire (Upper Sundon Chalk Quarry) (British leafminers) and Warwickshire (Alvecote) (Robbins, 1991: 96). (NBN Atlas).

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

Distribution elsewhere: Germany (Spencer, 1990: 397).

NBN Atlas links to known host species:

Centaurium erythraea

British and Irish Parasitoids in Britain and elsewhere: 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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