[1][2] External images For terms see Morphology of Diptera The wing length 6-8·25 mm.

Dark ground colour with steeply inclined hooked markings (the inner limb is strongly oblique).

[3] Keys and accounts A wetland species found on tall emergent pond side vegetation, margins of mesotrophic pools and lakes with Scirpus or Sparganium.

Flowers visited include Caltha palustris, Ranunculus repens, white umbellifers, Sonchus arvensis, Sorbus aucuparia and Taraxacum.

[9] A Palearctic species with a wide distribution in Europe[10] East to Siberia.