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

N.B. Links to the latest version of 'Leafminers and plant galls of Europe' are being edited

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Pegomya laticornis (Fallén, 1825)
[Diptera: Anthomyiidae]


Musca laticornis Fallén, 1825. Monogr. Musc. Sveciae 9: 86
Pegomyia genupuncta Stein, 1906. Wien. ent. Ztg 25: 90. [Synonymised by Michelson, 1983].
Pegomya laticornis (Fallén, 1825).


Leaf-mine: Blotch mine restricted by leaf veins; frass in irregular lumps.

The mine begins at the leaf underside, close to a heavy vein, at a white egg shall that remains in place even in fully developed mines. Often several eggs at distances of about 1 cm along the vein. Each larva makes a large blotch without a preceding corridor. Almost all frass is concentrated in a big mass in the the initial part of the mine. In this part the mine is lower-surface (therefore one sees green leaf tissue overlying the frass mass), but further on the mine is upper-surface, in fact almost full depth and very transparant. In fresh mines remnants of the parenchyma are visible as secondary feeding lines. Often the older mines coalesce. Pupation outside the mine (Bladmineerders van Europa).

Forms a large blotch mine, which may contain several larvae, on the leaf upper surface. The white eggs are laid close to a vein (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.

The larva is illustrated in 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).

The puparium is illustrated in Bladmineerders van Europa.

Pegomya laticornis puparium
Pegomya laticornis puparium
Image: © Willem Ellis (Bladmineerders van Europa)

Comments: Ackland in Chandler (1978) did not indicate whether his host record was British or Foreign and is therefore included under 'Hosts in Britain' and 'Hosts elsewhere

Hosts in Great Britain & Ireland:

Asteraceae        
Arctium       Mines in BMNH
Arctium       Robbins, 1991: 110
Arctium       British leafminers
? Arctium lappa Greater Burdock British Wild Flowers by John Somerville et al. Ackland in Chandler, 1978: 228, as genupuncta
Arctium minus Lesser Burdock British Wild Flowers by John Somerville et al. Mines in BMNH

Hosts elsewhere:

Asteraceae        
Arctium       Hering, 1957
? Arctium lappa Greater Burdock British Wild Flowers by John Somerville et al. Ackland in Chandler, 1978: 228, as genupuncta
Arctium lappa Greater Burdock British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Arctium minus Lesser Burdock British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Arctium tomentosum Woolly Burdock   Bladmineerders van Europa

Time of year - mines: June-July (Hering, 1957). Summer (British leafminers).

Time of year - adults: Currently unknown.

Distribution in Great Britain & Ireland: England including Warwickshire (Merevale) (Robbins, 1991: 110); Cambridgeshire, Nottinghamshire, Shropshire and South-west Yorkshire (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe including The Netherlands (Bladmineerders van Europa), Austria, Czech Republic, Denmark, ? Finland, French mainland, Germany, Poland, Romania, Russia - Central and Sweden (Michelsen in Fauna Europaea).

NBN Atlas links to known host species:

Arctium lappa, Arctium minus, Arctium tomentosum

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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