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Orthonevra brevicornis (Loew, 1843)

Identification

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

Biology

The larva is aquatic, living in accumulations of decaying vegetation, especially in mesotrophic or base-rich seepages in fens, meadows and occasionally woods. Adults can be found in marshes and fens.

Flight period

The following plots show the number of unique records per week excluding those reported to be of immature stages. Phenology plots for Orthonevra brevicornis

Status

Was listed as 'Notable' by Falk, 19912, but dropped from this status by Ball & Morris, 20143 who consider it LOWER RISK.

Distribution

This scarce species is widely distributed in England, though possibly more frequent towards the south and east. There are scattered records from both Scotland and Wales. Distribution map for Orthonevra brevicornis

Trends

The following plots show the Frescalo TFactor vs year and a map of the rescaled frequency (all records) for the species.Trend plots for Orthonevra brevicornis

  1. Ball, S., & Morris, R. (2024). Hoverflies of Britain and Ireland. WILDGuides (3rd ed.). Oxford: Princeton University Press. ↩

  2. Falk, S. (1991). A review of the scarce and threatened flies of Great Britain. ( No. 39). Research and Survey in Nature Conservation (pp. 1–194). Peterborough: NCC. ↩

  3. Ball, S., & Morris, R. (2014). A review of the scarce and threatened flies of Great Britain. Part 6: Syrphidae. ( No. 9). Species status (pp. 1–130). Peterborough: JNCC. ↩