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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Phytomyza wahlgreni Rydén, 1944
[Diptera: Agromyzidae]


Phytomyza wahlgreni Rydén, 1944. Opusc. ent. 9: 49
Phytomyza taraxacocoecis Hering, 1949d. Notul. ent. 29: 29. [Synonymised by Spencer, 1976: 527]
Phytomyza taraxacocoecis Hering, 1949d; Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 71, 85 (fig. 283), 87, 88, 115
Phytomyza wahlgreni Rydén, 1944; Spencer, 1976. Fauna ent. Scand. 5(1): 527-8, figs 921-2.
Phytomyza wahlgreni Rydén, 1944; Spencer, 1990. Host specialization in the World Agromyzidae (Diptera) : 259, 267, 268 (figs 1011-2).


Leaf-miner/ Galler: Larva feeding in the mid-rib or flower stalk where a gall-like swelling is produced (see also Redfern et al., 2002: 453, fig. 914). Pupation at base of leaf, near exit hole prepared by larva prior to pupation (see also Redfern et al., 2002: 453, figs 915).

The larva lives in a corridor of just a few cm long within the midrib. The leaf is stunted and the midrib is strongy swollen, gall-like. In the end the mine turns red. Pupation within the mine, near a previously made exit in the upper surface of the mine (Bladmineerders van Europa).

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).

Hosts in Great Britain & Ireland:

Asteraceae        
Taraxacum officinale Dandelion British Wild Flowers by John Somerville et al. Spencer, 1972b; 115

Hosts elsewhere:

Asteraceae        
Taraxacum       Spencer, 1976: 527
Taraxacum       Spencer, 1990: 259
Taraxacum officinale Dandelion British Wild Flowers by John Somerville et al. Bladmineerders van Europa

Time of year - mines: Currently unknown.

Time of year - adults: Currently unknown.

Distribution in Great Britain & Ireland: Widespread, at least in south. London (Hampstead), Hertfordshire (New Barnet), Hampshire (New Forest), Dorset (Studland), Suffolk (Newmarket) (Spencer, 1972b: 87, as taraxacocoecis); Brecon. Cambridgeshire, East Cornwall, Monmouthshire, Montgomeryshire, South-west Yorkshire, West Glocestershire and Westmorland (NBN Atlas).

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

Distribution elsewhere: Widespread in continental Europe from Swiss Alps to Faroe Is., including Denmark, Finland, Norway, Sweden (Spencer, 1976: 527), Germany (Spencer, 1976: 582), Belarus, Czech Republic, Estonia, French mainland, Italian mainland, Lithuania and Poland (Martinez in Fauna Europaea).

Also recorded from the East Palaearctic and Nearctic Region (Martinez in Fauna Europaea).

NBN Atlas links to known host species:

Taraxacum officinale

British and Irish Parasitoids in Britain and elsewhere:

Ichneumonoidea  
Chorebus merion (Nixon, 1945) Braconidae: Alysiinae
Dacnusa pubescens (Curtis, 1926) Braconidae: Alysiinae


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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Last updated 06-Oct-2017 Brian Pitkin Top of page