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Eristalis rupium Fabricius, 1805

Identification

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

Biology

The larva is of the 'long-tailed' type and is apparently found in clean-water situations, such as spring-fed permanent streams. Adults are usually found in fairly open situations such as wet meadows and streamsides with abundant flowers, often in the uplands (to about 300m). They can sometimes be found in glades in conifer plantations where flowers are abundant.

Flight period

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

Status

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

Distribution

This is a northern and western species which can be very local, even in apparently suitable areas. Care is needed in identification as it can be confused with E. horticola. dotmap

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. trend

  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. ↩