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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Cerodontha bimaculata (Meigen, 1830)
[Diptera: Agromyzidae]


Agromyza bimaculata Meigen, 1830. Syst. Beschr. 6: 172
Cerodontha (Dizygomyza) bimaculata (Meigen, 1830); Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 101
Cerodontha (Dizygomyza) bimaculata (Meigen, 1830); Spencer, 1976. Fauna ent. Scand. 5(1): 213-4, figs 368-9.
Cerodontha (Dizygomyza) bimaculata (Meigen, 1830); Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 345, 346 (fig. 1307), 351.


Leaf-mine: Long, rather narrow corridor, upper-surface or interparenchymatous mine. The mine changes direction one or two times. Often the corridor ends in the leaf sheath. Frass in one or two large lumps. Puparium in the lower part of the mine. Hibernation in the pupariuml state (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.

The larva is described by de Meijere (1925) and Nowakowski (1973). Posterior spiracleswith three strongly elongated bulbs that stand out at a right angle, not unlike a hen's toes (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).

Elongate, not deeply segmented. Posterior spiracles each with 3 finger-like bulbs (Spencer, 1976: 214).

Hosts in Great Britain & Ireland:

Juncaceae        
Luzula       Robbins, 1991: 128
Luzula multiflora Heath Wood-rush British Wild Flowers by John Somerville et al. Spencer, 1972b: 125
Luzula pilosa Hairy Wood-rush British Wild Flowers by John Somerville et al. Spencer, 1972b: 125

Hosts elsewhere:

Juncaceae        
Luzula       Spencer, 1976: 214
Luzula       Spencer, 1990: 345
Luzula campestris Field Wood-rush British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Luzula multiflora Heath Wood-rush British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Luzula pilosa Hairy Wood-rush British Wild Flowers by John Somerville et al. Bladmineerders van Europa
Luzula pilosa Hairy Wood-rush British Wild Flowers by John Somerville et al. Spencer, 1990: 345
Luzula sylvatica Great Wood-rush British Wild Flowers by John Somerville et al. Bladmineerders van Europa

Time of year - mines: July-October, rarely November (Bladmineerders van Europa).

Time of year - adults: May - September.

Distribution in Great Britain & Ireland: Widespread in Britain including Kent (Hayes Common), Surrey (Colley Hill), Middlesex (Scratch Wood), Hampshire (New Forest), Suffolk (Woodditton Wood), Huntingdonshire (Woodwalton Fen), Hereford (Tarrington), Westmorland (Newby), Yorkshire (Malham Tarn), Banff (Loch Oark) and Inverness (Aviemore) (Spencer, 1972b: 101) and East Kent (VC15), North Devon (VC4), Glamorganshire (VC41), Monmouthshire (VC35), North Devon (VC4), North Somerset (VC6), South Wiltshire (VC8), Stafford and West Kent (NBN Gateway).

NBN Grid Map:

NBN Grid Map

Cerodontha bimaculata
NBN Grid Map : NBN Terms and Conditions

Maps are only displayed if the NBN server is active. N.B. Only publicly available records, if any, are shown by default

Distribution elsewhere: Widespread in continental Europe, including Denmark, Sweden, Norway (Spencer, 1976: 214), The Netherlands (Bladmineerders van Europa), Belgium (de Bruyn and von Tschirnhaus, 1991), Germany (Spencer, 1976: 554), Austria, Czech Republic, Estonia, Finland, Hungary, Italian mainland, Latvia, Lithuania, Poland, Romania, Slovakia, Spanish mainland and Vatican City (Martinez in Fauna Europaea).

NBN Interactive Grid Maps of known host species:

Luzula campestris, Luzula multiflora, Luzula pilosa, Luzula sylvatica

British and Irish Parasitoids in Britain and elsewhere:

Chalcidoidea   

Chrysocharis pubens Delucchi, 1954

Eulophidae: Entedoninae
Cyrtogaster vulgaris Walker, 1833 Pteromalidae: Pteromalinae
Miscogaster elegans Walker, 1833 Pteromalidae: Miscogastrinae
Ichneumonoidea  
Apodesmia similis (Sz├ępligeti, 1898) Braconidae: Opiinae
Diadegma armillatum (Gravenhorst, 1829) Ichneumonidae: Campopleginae


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