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

1a > Leaf-miner: A narrow linear mine which can develop into a secondary blotch (Spencer, 1976: 517).

Upper-surface mine in the tip of a leaf segment in primary corridor, but quickly turning into secondary blotch within the limited space of the leaf segment. The mine begins in the very tip of the segment, this initial section later becomes unrecognisable. Frass in fine granules. Pupation outside the mine.

On Peucedanum, but not yet on Selinum, in Britain and Peucedanum and Selinum elsewhere. Recorded as new to Britain by Irwin (1985: 103). Known from East Norfolk. Widespread in continental Europe.

Phytomyza thysselini Hendel, 1923 [Diptera: Agromyzidae].

1b > Leaf-miner: A short, narrow, linear mine, generally closely following margin of leaf segment; in very small sections of a leaf producing a secondary blotch (Spencer, 1972b: 89 (fig. 302), 92; Spencer, 1976: 401 (fig. 702), 402).

Upper-surface corridor, in the end widening so strongly that within the limited space of an umbelliferous leaf often a secondary blotch is the result. The upper-surface mine is preceded by a short lower-surface corridor, made by the first instar larva during the first part of this stage (Allen, 1956a). It is difficult to observe, also because it tends to follow the leaf margin. Frass in two untidy rows of isolated grains. Before pupation the larva leaves the mine through a semicircular exit slit in the lower epidermis.

A narrow mine, follows leaf marginand forms secondary blotches.

On Anthriscus, Chaerophyllum, Conopodium, Daucus, Torilis and ? Sison, but not yet on Selinum, in Britain On additional Apiaceae elsewhere. Common and widespread throughout Britain. Also recorded in the Republic of Ireland and widespread and common throughout much of Europe.

Phytomyza chaerophylli Kaltenbach, 1856 [Diptera: Agromyzidae].