[4][5] External images For terms see Morphology of Diptera Wing length 4.5–5 mm.

Mouth edge protruding no more than a distance equal to 1/2 the horizontal diameter of an eye.

[8] [9] [10][11] The male genitalia are illustrated by Barkemeyer and Claussen (1986) [12] Palearctic Fennoscandia South to North Spain, the Alps, Italy and Yugoslavia.

[15] Flowers visited include white umbellifers, Anemone nemorosa, Caltha, Cardamine, Ficaria verna, Galium, Prunus avium, Ranunculus, Salix, Sorbus aucuparia, Taraxacum.

The larva is aquatic and has found beneath the outer leaves of rotting Typha stems.