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| Cerodontha denticornis (Panzer, 1806) [Diptera: Agromyzidae] |
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Chlorops
denticornis Panzer, 1806. Faunae insect. germ. Fasc.
104: Tab. 22 |
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Leaf-miner: Larva feeds mainly in the leaf sheaths. The short mines which may be formed in the leaf blade may be easily overlooked. Pupation internal (Spencer, 1976: 178). Mine begins as a narrow, usually upper-surface, occasionally lower-surface or interparenchymatous corridor in the blade, that descends towards the ligule, thence continues into the leaf sheath, generally on its inside. Usually only one mine per leaf. Puparium in a puparial chamber at the margin of the leaf sheath. Neither mine nor larva can be distinguished from that of C. fulvipes that, as far as is known, only feeds on Poa trivialis (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 Venturi (1946), Sasakawa (1961), Nowakowski (1973), Dempewolf (2001: 120) and Darvas, Skuhravá and Andersen (2000). 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). Comments: Festuca gigantea is treated as Schedonorus gigantea (Giant Fescue) and Festuca pratensis is treated as Schedonorus pratensis (Meadow Fescue) by Stace (2010). Hosts in Great Britain and Ireland:
Hosts elsewhere: Time of year - mines: June-September, sometimes October (Bladmineerders van Europa). Time of year - adults: June. Distribution in Great Britain and Ireland: Widespread from the south to Scotland, most northerly record Outer Hebrides (Lewis: Melbost) (Spencer, 1972b: 107), most southerly record Channel Is. (Fauna Europaea); Anglesey, Breconshire, Caernarvonshire, Cambridgeshire, Cardiganshire, Carmarthenshire, Cheshire, Cumberland, Denbighshire, Derbyshire, Dorset, Durham, East Cornwall, East Gloucestershire, East Kent, East Norfolk, East Ross, East Suffolk, Easterness, Elgin, Glamorgan, Herefordshire, Huntingdonshire, Leicester, Merionethshire, Middlesex, Monmouthshire, Montgomeryshire, North Ebudes, North Essex, North Hampshire, North Northumberland, North Somerset, North-east Yorkshire, Northamptonshire, Nottinghamshire, Pembrokeshire, Shropshire, South Aberdeenshire, South Devon, South Essex, South Lancashire, South Northumberland, South Somerset, South-east Yorkshire, South-west Yorkshire, Stafford, Surrey, Warwickshire, West Cornwall, West Gloucestershire, West Lancashire, West Norfolk, West Suffolk, Westmorland and Worcestershire (NBN Atlas). Also recorded in the Republic of Ireland: Co. Clare and Co. Mayo (Spencer, 1972b: 107). Distribution elsewhere: Very common in Europe including Denmark, Finland, Norway, Sweden and Sicily (Spencer, 1976: 178), The Netherlands (Bladmineerders van Europa), Belgium (de Bruyn and von Tschirnhaus, 1991), Germany (Spencer, 1976: 550; Dempewolf, 2001: 120), Austria, Bulgaria, Canary Is., Czech Republic, Greek mainland, Hungary, Lithuania, Madeira, Poland, Slovakia, Spanish mainland, Switzerland and Yugoslavia (Fauna Europaea). Also recorded in north Africa (Morocco) and Japan (Spencer, 1976: 178). NBN Atlas links to known host species: British and Irish Parasitoids in Britain and elsewhere:
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