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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OXYRIA. Mountain sorrel. [Polygonaceae]


Mountain Sorrel (O. digyna) is the only species of Oxyria recorded in Britain. It is a native species.

Three British miners are recorded on Oxyria.

A key to the European miners recorded on Oxyria is provided in Bladmineerders van Europa.



Key for the identification of the known mines of British
insects (Diptera and non-Diptera) recorded on Oxyria


1a > Leaf-miner: Large upper side blotch or blister mine, which can start with a short corridor. In small leaves the mine can be full depth in places. Often several larvae in a mine; frass irregularly scattered in large lumps. Pupation external.

On Fallopia, Persicaria, Polygonum, Rumex and ? Begonia, but not yet on Oxyria, in Britain. On Begonia [Begoniaceae] and other genera of Polygonaceae elsewhere. Widespread in Britain. Also recorded in the Republic of Ireland. Widespread in continental Europe. Also recorded in Morocco, Algeria, Tunisia, Syria, Israel, Korea, China and Japan.

Pegomya bicolor (Wiedemann, 1817) [Diptera: Anthomyiidae].

1b > Leaf-miner: Linear mine, becoming a blotch. Two or more larvae feeding together. Frass in lines.

At the start of the mine on the leaf under surface a group of about 5 oval white egg shells (just 1 on the small leaves of Rumex acetosella). The emerging larvae initally work shoulder to shoulder in making a broad corridor. Later they split up, making a large blotch, that often is enlarged even more by fusion with other mines. The mine is practically full depth. Frass blackish-green, often deliquescent. The larvae can leave a mine and restart elsewhere. Pupation outside the mine (Bladmineerders van Europa).

The mine starts as a short corridor on the lower surface and then becomes a large upper surface blotch. Several larvae can mine together (British leafminers).

Pegomya laticornis puparium
Pegomya solennis puparium
Image: © Willem Ellis (Bladmineerders van Europa)

On ? Oxyria, ? Polygonum and Rumex in Britain plus Emex and Persicaria elsewhere. Widespread in Britain. Also recorded in the Republic of Ireland. Widespread in continental Europe.

Pegomya solennis (Meigen, 1826) [Diptera: Anthomyiidae].

1c > Leaf-miner: Initially a gallery is formed, this turning into a blotch, and later two successive conical leaf-rolls (UKMoths). Initially a pale, later brown, usually lower-surface blotch. The blotch is preceded by an epidermal corridor, but that may be obliterated by the later blotch. Silk at the inside of the mine causes it to buckle up a bit and fold. The reddish brown frass is accumulated in a corner of the mine. The older larva leaves the mine and continues feeding inside an untidy cone, made by cutting off a strip of leaf tissue and stitching it in place with silk (Bladmineerders van Europa).

On Fallopia, Lysimachia, Persicaria, Polygonum and Rumex, but not yet on Oxyria, in Britain and Chenopodium, Lysimachia, Lythrum, Persicaria, Oxyria, Persicaria, Polygonum and Rumex elsewhere. Occurring locally in England, Scotland and parts of Ireland. Widespread in continental Europe.

Calybites phasianipennella (Hübner, 1813) [Lepidoptera: Gracillariidae].



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