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Family of insects From Wikipedia, the free encyclopedia
Hoverflies, also called flower flies or syrphids, make up the insect family Syrphidae. As their common name suggests, they are often seen hovering or nectaring at flowers; the adults of many species feed mainly on nectar and pollen, while the larvae (maggots) eat a wide range of foods. In some species, the larvae are saprotrophs, eating decaying plant and animal matter in the soil or in ponds and streams. In other species, the larvae are insectivores, preying on aphids, thrips, and other plant-sucking insects.
Syrphidae Temporal range: | |
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Sixteen different species of hoverflies | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Diptera |
Section: | Aschiza |
Superfamily: | Syrphoidea |
Family: | Syrphidae Latreille, 1802 |
Subfamilies | |
Insects such as aphids are considered crop pests, and therefore the aphid-eating larvae of some hoverflies are economically and ecologically important. The larvae are potential agents for use in biological control; while the adults are pollinators.
About 6,000 species in 200 genera have been described. Hoverflies are common throughout the world and can be found on all continents except Antarctica. Hoverflies are harmless to most mammals, though many species are mimics of stinging wasps and bees, a mimicry which may serve to ward off predators.
Hoverfly hovering behavior is unlike that of hummingbirds since they do not feed in midair. Hovering in general may be a means of finding a food source; male hovering is often a territorial display seeking females,[1] while female hovering serves to inspect ovipositing sites. [2] [3] [4]
The size of hoverflies varies depending on the species.[5] For example Paragus tibialis[6][7][8] is 3–5 mm (1⁄8–13⁄64 in) long while Criorhina nigriventris is 13.6–20.6 mm (17⁄32–13⁄16 in) long.[9] Some, such as members of the genus Baccha, are small, elongated, and slender, while others, such as members of Criorhina, are large, hairy, and yellow and black. As members of the Diptera, all hoverflies have a single functional pair of wings, with the hind wings reduced to balancing organs.[10] Many species are brightly colored, with spots, stripes, and bands of yellow or brown covering their bodies.[10] Due to this coloration, they are often mistaken both by insect-eating birds and by humans for wasps or bees; they exhibit Batesian mimicry. Despite this, hoverflies are harmless to humans.[5] Drone flies, Eristalis tenax, are an example of a species of hoverfly who exhibit Batesian mimicry.[11]
With a few exceptions,[12] Hoverflies are distinguished from other flies by having a spurious vein, located parallel to their fourth longitudinal wing vein.[5] Adults feed mainly on nectar and pollen.[10] Many species also hover around flowers, lending to their common name.[5]
Bee flies of the family Bombyliidae often mimic Hymenoptera and hover around flowers, as well, rendering some bombyliid species hard to tell apart from Syrphidae at first glance. Hoverflies can, nevertheless, be distinguished in the field by anatomical features such as:[citation needed]
Unlike adults, the maggots of hoverflies feed on a variety of foods; some are saprotrophs, eating decaying plant or animal matter, while others are insectivores, eating aphids, thrips, and other plant-sucking insects.[5][13] Predatory species are beneficial to farmers and gardeners, as aphids destroy crops, and hoverfly maggots are often used in biological control. This includes one of the most common widespread hoverfly species, Episyrphus balteatus, whose larvae feed on aphids. Certain species, such as Merodon equestris or Eumerus tuberculatus, are responsible for pollination.[citation needed]
An example of a well-known hoverfly maggot is the rat-tailed maggot, of the drone fly, Eristalis tenax. It has a breathing siphon at its rear end, giving it its name.[5] The species lives in stagnant water, such as sewage and lagoons.[14] The maggots also have a commercial use, and are sometimes sold for ice fishing.[15]
Very rarely, hoverfly larvae have caused accidental myiasis in humans. This occurs when the larvae are accidentally ingested from contaminated food.[14][16]
The oldest known fossils of crown group Syrphidae are from the Eocene aged Florissant Formation, Green River Formation and Baltic amber. However, the genus Prosyrphus from the Late Cretaceous (Cenomanian) aged Burmese amber appears to represent a stem group to the family.[17]
Hoverflies are a cosmopolitan family found in most biomes, except extreme deserts, tundra at extremely high latitudes, and Antarctica.[18][19] Certain species are more common in certain areas than others; for example, the American hoverfly, Eupeodes americanus, is common in the Nearctic realm, and the common hoverfly, Melangyna viridiceps, is common in the Australasian realm. About 6,000 species and 200 genera are in the family.[20]
While some hoverfly larvae are aquatic and are often found in stagnant water, those of species that prey upon aphids and other plant parasites are usually terrestrial, residing on leaves.[21] Adults are often found near flowers, their principal food source being nectar and pollen.[10] Some species are inquilines; for instance, members of the genus Volucella can be found in bumblebee nests, while members of Microdon are myrmecophiles, found in ant or termite nests.[5] Others can be found in decomposing vegetation.
Hoverflies are important pollinators of flowering plants in many ecosystems worldwide.[22] Syrphid flies are frequent flower visitors to a wide range of wild plants, as well as agricultural crops, and are often considered the second-most important group of pollinators after wild bees. However, relatively little research into fly pollinators has been conducted compared with bee species.[22] Bees are thought to be able to carry a greater volume of pollen on their bodies, but flies may be able to compensate for this by making a greater number of flower visits.
Like many pollinator groups, syrphid flies range from species that take a generalist approach to foraging by visiting a wide range of plant species through those that specialize in a narrow range of plants.[23] Although hoverflies are often considered mainly nonselective pollinators, some hoverflies species are highly selective and carry pollen from one plant species.[24] Cheilosia albitarsis is thought to only visit Ranunculus repens.
Specific flower preferences differ among species, but syrphid fly species have repeatedly been shown to prefer white- and yellow-coloured flowers.[25] Nonvisual flower cues such as olfactory cues also help these flies to find flowers, especially those that are not yellow.[26] Many syrphid fly species have short, unspecialized mouth parts and tend to feed on flowers that are more open as the nectar and pollen can be easily accessed.[27]
Also, a number of interactions occur between orchids and hoverflies. The orchid species Epipactis veratrifolia mimics alarm pheromones of aphids which attracts pollinating hoverflies.[28] Another plant, the slipper orchid in southwest China, also achieves pollination by deceit by exploiting the innate yellow color preference of syrphids.[29]
Adult syrphid flies are pollinators.
Larvae of many hoverfly species prey upon pest insects, including aphids and leafhoppers, which spread some diseases such as curly top, so they are seen in biocontrol as a natural means of reducing levels of pests. Gardeners, therefore, sometimes use companion plants to attract hoverflies. Those reputed to do so include Alyssum spp., Iberis umbellata, statice, buckwheat, chamomile, parsley, and yarrow.[30] Larvae in the subfamily Eristalinae live in semi-aquatic and aquatic environments, including manure and compost, and can filter and purify water.
Fredrik Sjöberg's book The Fly Trap concerns his enthusiasm for hoverflies on the island of Runmarö in the Baltic Sea.[31] The island is a hotspot for hoverflies and other insects; Sjöberg has collected 58 species of butterflies there, and (in seven years of hunting) 202 species of hoverflies, including 180 in his garden.[32]
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