Next Post

Chalcosyrphus eunotus (Loew, 1873)

Identification

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

Synonymy

Brachypalpus eunotus Loew, 1873 in Coe(1953)2 and Kloet & Hincks (1976)3.

Biology

This is a woodland species that is most frequently encountered in deep, steep-sided dingle woodlands from Gloucestershire to Shropshire where it is associated with fallen timber in log-jams in streams. The larvae develop under the bark of partially submerged timber.

Flight period

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

Status

Lower Risk (Nationally scarce) - Ball & Morris, 20144. Vulnerable (RDB2) - Falk, 19915 and Shirt, 19876.

Distribution

This species is mainly confined to the West Midlands/Welsh borders region and to a small number of localities in Dorset, Somerset and Staffordshire. In the past ten years there have been numerous records from the Welsh Marches. Distribution map for Chalcosyrphus eunotus

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 Chalcosyrphus eunotus

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

  2. Coe, R. (1953). Diptera: Syrphidae. Handbooks for the Identification of British Insects, 10(1), 1–98. ↩

  3. Kloet, G., & Hinks, W. (1976). A check list of British insects. 2nd Ed. Part 5: Diptera and Siphonaptera. Handbooks for the Identification of British Insects, 11, 1–139. ↩

  4. 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. ↩

  5. 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. ↩

  6. Shirt, D. (Ed.). (1987). Red Data Books: 2. Insects. Peterborough: NCC. ↩