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(Coleoptera, Diptera, Hymenoptera and Lepidoptera)
by
Brian Pitkin, Willem Ellis, Colin Plant and Rob Edmunds
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LEMNA.
Duckweeds. [Lemnaceae]
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Four
species of Lemna are recorded in Britain. These include the
native Fat Duckweed (L. gibba), Common Duckweed (L. minor)
and Ivy-leaved Duckweed (L. trisulca) and the introduced
Least Duckweed (L. minuta). The BSBI provide a downloadable plant crib for Lemna.
Two British miners are recorded on Lemna.
A key to the European miners recorded on Lemna is provided in Bladmineerders van Europa.
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Key for the identification of the known mines of British
insects (Diptera and non-Diptera) recorded on Lemna
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1a > Leaf-miner: Initially a corridor, with hardly recognisable frass; in due course the entire tthallus is eaten out. Pupation within the mine. |
On ?
Lemna, Potamageton and ? Spirodela in Britain and Lemna, Potamageton and Spirodela elsewhere. Britain and continental Europe
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Hydrellia
albilabris (Meigen, 1830) [Diptera:
Ephydridae]
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1b > Leaf-miner: 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). |
Mine
of Hydrellia griseola on Glyceria fluitans
Image: © Willem Ellis (Bladmineerders van Europa)
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Polyphagpus. On
? Alisma, ? Damasonium,
? Sagittaria, ? Bellis,
? Rorippa, Tropaeolum, ? Lychnis,
? Stellaria,
? Carex,
? Cyperus,
? Scirpus,
? Hydrocharis,
? Stratiotes,
? Lamium,
? Lemna,
? Allium, Arrhenatherum,
? Polygonum,
? Potamogeton,
? Veronica,
? Typha in Britain.
On ? Alisma,
? Damasonium, ? Sagittaria,
? Bellis, ? Rorippa, Tropaeolum, Lychnis,
? Stellaria, Carex,
? Scirpus, Trifolium,
? Hydrocharis, Lamium,
? Lemna, Allium, Papaver, Agrostis, Alopecurus, Apera, Arrhenatherum, Avena, Avenula, Brachypodium, Briza, Bromus, Calamagrostis, Dactylis, Desmazeria, Digitaria, Echinochloa, Eleusine, Elymus, Festuca, Gaudinia, Glyceria, Holcus, Hordeum, Lagurus, Lolium, Panicum, Phalaris, Phleum, Phragmites, Poa, Secale, Setaria, Triticum,
? Polygonum, ? Potamogeton, Veronica, ? Typha and Verbena elsewhere.
Widespread in England. Also recorded in the Republic of Ireland.
Widespread in the Palaearctic region. Also recorded from Nearctic
and Australasian Regions.
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Hydrellia
griseola (Fallén, 1813) [Diptera: Ephydridae]. |
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