Cheilosia impressa Loew, 1840

Identification

Identification difficulty = 3. according to Ball & Morris, 2024¹

Biology

The larva of this species remains unknown. Adults are found in damp situations such as carr woodland and wooded river-banks, where they visit white umbellifers, especially Hemlock Water Dropwort Oenanthe crocata, and a range of other flowers including yellow composites and buttercups Ranunculus sp. Males hover at moderate height in sheltered situations in clearings and glades.

Flight period

The following plots show the number of unique records per week that were not reported to be of eggs, larvae or pupae.

Distribution

Current records suggest that this species is mainly confined to England and Wales with the highest density of records in southern England. It occurs in a few lowland coastal localities in Scotland and one inland location in Perthshire.

Trends

The following plots show the Frescalo TFactor vs year and a map of the rescaled frequency (all records) for the species. For an explanation see here.