Flowering Plants Visited by Syrphus torvus in Illinois
(observations are from Robertson, Graenicher, Anderson & Hill, Schemske et al., and Small)
Apiaceae: Chaerophyllum procumbens sn (Rb), Heracleum maximum sn (Rb); Aquifoliaceae: Nemopanthus mucronatus (Sm); Asteraceae: Aster drummondii sn/fp (Gr), Aster laevis sn/fp (Gr), Aster lateriflorus sn (Rb); Brassicaceae: Arabis shortii sn (Rb), Dentaria laciniata (Shm); Hamamelidaceae: Hamamelis virginiana sn/fp (AH); Lauraceae: Sassafras albidum sn (Rb); Polygonaceae: Persicaria pensylvanica sn (Rb); Portulacaceae: Claytonia virginica sn (Rb, Shm); Ranunculaceae: Enemion biternatum fp/exp (Shm), Ranunculus septentrionalis sn (Rb); Rosaceae: Aronia melanocarpa fq (Sm), Crataegus intricata sn (Rb), Prunus americana sn (Rb); Salicaceae: Salix amygdaloides [pist sn] (Rb), Salix rigida [stam sn] (Rb)
larva of Syrphus torvus is associated with aphid-infested Acer pseudoplatanus
Animal / predator
larva of Syrphus torvus is predator of Aphidoidea
Life History and Behavior
Molecular Biology and Genetics
Barcode data: Syrphus torvus
Below is the sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.
See the BOLD taxonomy browser for more complete information about this specimen.
Other sequences that do not yet meet barcode criteria may also be available.
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Download FASTA File
Statistics of barcoding coverage: Syrphus torvus
Public Records: 4
Specimens with Barcodes: 56
Species With Barcodes: 1
Syrphus torvus is a medium-sized hoverfly that somewhat resembles a wasp, with adults measuring 10 to 13 mm (0.4 to 0.5 in). The head is broad and the large brown compound eyes have hairy surfaces, more obvious in males than females. The eyes are nearly touching in males but are more widely separated in females. The face and short antennae are yellow. The thorax is black, the legs yellow and black, and the single pair of wings is translucent with dark veining. The abdomen is oblong and slightly flattened. It is fringed with short yellow hairs and striped in yellow and black, the first yellow stripe being divided by a central black bar.
Distribution and habitat
Syrphus torvus is a common species and is found in the Palearctic ecozone including Europe, Asia and North America. It is often found in woodland or near the verges of woods. Large numbers of hoverflies of this species and of Metasyrphus sp. have been observed on Mount McKinley in the Rocky Mountains at altitudes of 5,000 metres (16,000 ft) at the head of the Kahiltna Glacier.
Syrphus torvus is on the wing from spring to autumn. It is a migratory species. Adults feed on pollen and nectar and are particularly attracted to yellow and white flowers. The larvae feed on aphids and the insect overwinters as larvae.
- "Hoverflies (Syrphidae)". The Garden Safari. Retrieved 2014-12-03.
- Edwards, J. S. (1987). "Arthropods of Alpine Aeolian Ecosystems". Entomology 32: 163–179. doi:10.1146/annurev.en.32.010187.001115.
- Stubbs, Alan E.; Falk, Steven J. (1983). British Hoverflies: An Illustrated Identification Guide. British Entomological & Natural History Society. p. 233, xvpp.
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