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Species Page - Syrphus torvus
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scientific name    Syrphus torvus    

habitat
Boreal regions, mixed forest, parks, gardens.

seasonality
Adult flight period is quite extensive, occurring from April to November.

identification
Approximately 7 to 15 mm in length, black and yellow body, face yellow. Although S. torvus looks superficially very much like both S. ribesii and S. vitripennis (refer to descriptions for these two species), its distinctive characteristic is that both males and females have hairy eyes. The hairs on the male eyes are denser and longer than those on the female eyes, however this characteristic is quite clear for both sexes (under a microscope). As well, the yellow bands of tergites 3 and 4 are complete, and both sexes have a hind femur that is black for approximately the basal three-quarters (Vockeroth 1992).

life history
Probably multivoltine, with the larva as the overwintering stage. Syrphus torvus is aphidophagous and polyphagous, seeming to prefer shrubs and trees to herbs (Schneider 1969). Sendstad (1976) reported that they seem to prefer the vegetation-rich slopes beneath bird cliffs in Spitsbergen, Svalbard.

conservation
Widespread, not of concern.

diet info
Syrphus torvus is entirely aphidophagous, and the larvae have been recorded on the aphids Cinara carolina, and on Euceraphus spp. (Vockeroth 1992). Adults feed on pollen and nectar.

range
Syrphus torvus is widespread throughout Canada, and from Alaska down to California and Mississippi. It is also found in much of Europe (including as far north as Svalbard), as well as Asia, with records from Siberia and Nepal (Vockeroth 1992).

notes
For a clear description of an effective and simple method for rearing S. torvus see Frazer (1972).

quick link
http://entomology.museums.ualberta.ca/searching_species_details.php?s=5836



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References (4)
Specimen Info
There are 8 specimens of this species in the online database
Map Distribution
Adult Seasonal Distributioncreate a collection histogram with specimens
Specimen List (8)

 

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