Hydrellia griseola (Fallén, 1913)
Glyceria fluitans, Diemen, park Spoorzicht
Irregular mine, locally shallow, elsewhere much deeper, giving it a mottled appearance. In broadleaved plants the mine often begins as a blotch with stellate extensions, but sometimes as a very fine, shallow corridor. In grasses the mine often begins in the leaf sheath. The frass is very fine-grained, initially scattered, later in aggregates. The egg is deposited on the plant surface, and the empty egg shell remains visible. But the larvae are able to leave their mine and restart elsewhere, thus mines without an egg shell can be found as well. The larva also leaves the mine before pupation. Pupation takes place in a newly made, small, blotch mine without frass (©); this mine may be made in another plant (species). The adult fly has a greyish-white pruinosity.
Polyphagous, mainly on grasses:
Agrostis; Alopecurus geniculatus, pratensis; Allium; Apera spica-venti; Arrhenatherum elatius; Avena fatua; Avenula, Bassia; Bellis perennis; Brachypodium; Briza; Bromus; Calamagrostis; Carex sylvatica; Dactylis; Digitaria; Echinochloa crus-galli; Eleusine; Elymus; Festuca; Gaudinia; Glyceria notata; Holcus, Hordeum vulgare & subsp. distichon; Lagurus ovatus; Lolium; Panicum miliaceum; Papaver; Phalaris canariensis; Phalaroides arundinacea; Phleum; Phragmites australis; Poa; Setaria; Triticum; Verbena hybrida.
Larvae in May, July and September (Hering, 1957a).
BE recorded (Gosseries, 1991d).
NE recorded (de Meijere, 1939a).
LUX not recorded (Fauna Europaea, 2007).
distribution within Europe
Entire Europe (Fauna Europaea, 2007).
The larva can be distinguished from that of the Agromyzidae because the mandible has but one tooth. Also the anterior arm of the cephalic skeleton is longer than the rear arms.
Hydrellia chrysostoma (Meigen, 1830).
Beuk & Zatwarnicki (2002a), Buhr (1933a), Drăghia (1967a), Gallo (1996a), Gosseries (1991d), Hering (1931-32f, 1957a), Hollman-Schirrmacher & Zatwarnicki (1999a), Huber (1969a), Maček (1999a), de Meijere (1939a, 1950b), Ostrauskas, Pakalniškis & Taluntytė (2003a), Robbins (1991a), Séguy (1950a), Skala (1936a, 1951a), Sønderup (1949a), Zatwarnicki (1988a).