[1][2] External images For terms see Morphology of Diptera Wing length 4·5-5·5 mm.

European Russia to the Russian Far East, Siberia and Mongolia.

[8][9] Habitat: Quercus forest (beside springs, flushes and brooks).

Alnus and Salix habitats carr, fen and margins of raised bogs.

[10] Flowers visited include Anemone nemorosa, Bellis, Caltha, Cardamine, Malus sylvestris, Menyanthes, Prunus spinosa, Ranunculus, Salix, [11] The flight period is mid April to mid May.The larva is associated with springs and wet flushes.