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Eupeodes americanus, known as the American hoverfly or long-tailed aphid eater, is a widely distributed member of the family Syrphidae. Adults range from 7.0 to 11.0 mm in body length. The front of the head is yellow, the thorax is metallic bronze, and the abdomen is boldly marked with alternating brown and yellow bands. The wings are transparent, and the legs are yellow except for the dark bases near the body. Identifying flies in the genus Eupeodes can be difficult, and only males can be positively identified to species. The American hoverfly belongs to a complex of several closely related species that share similar body sizes and color patterns. They are part of a diverse group containing about 90 species in the Northern Hemisphere. American hoverflies are often mistaken for bees or wasps due to their yellow-and-black coloration and hovering behavior. Unlike bees and wasps from the order Hymenoptera, hoverflies possess only a single pair of wings and lack a stinger, making them harmless to humans.
Eggs are small, translucent, oval, and white or gray in color. The larvae are distinctive, grub-like, legless maggots with warty gray bodies and darker markings extending the length of the body. Mature larvae may reach 12 mm in length. A defined head capsule is absent, and the only visible mouthparts are a pair of small hooks at the tapering front end of the body. Close inspection of the hind end reveals a pair of brown breathing organs (spiracles). Larvae are often observed on exposed plant surfaces in the vicinity of their preferred prey items, aphids. Pupae are brown and assume a compact, teardrop shape when not feeding or moving around.
American hoverflies can be found across North America, from Canada to parts of the U.S. and Mexico, predominantly in meadows, prairies and flower-rich fields. This migratory species travels north to Canada during spring and south to the southeastern U.S. during fall. The species is multivoltine (multiple generations annually). The life cycle of the American hoverfly is holometabolous, as are all members of the order Diptera. Development consists of four stages: egg, larva, pupa and adult. Newly hatched larvae begin feeding voraciously on aphids and grow rapidly. Their development takes two to three weeks, during which they progress through three distinct growth stages (instars). Larvae progressively increase in size. After the final instar, the larvae pupate on exposed leaves and stems. Following about two weeks of pupation, the adult fly emerges, ready to begin the cycle again.
As with many other members of the family Syrphidae, American hoverflies are regarded as beneficial predators of plant feeding insects, particularly aphids. These small, sap-sucking insects are common agricultural pests, and many species are vectors of damaging plant viruses. Hoverfly larvae are effective biological control agents, capable of consuming up to 400 aphids each during their development. They also play a vital role in pollination, visiting various plants, including food crops and animal-pollinated flowers. This makes them essential for the reproductive success of many plant species. This dual role of pollination and aphid control makes the American hoverfly and its relatives valuable assets in agricultural settings. They are often introduced into greenhouses and other commercial operations to enhance pest management without use of pesticides.
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Eupeodes americanus adult. Photo by Nikolett Tóth, iNaturalist, Creative Commons.
Eupeodes americanus larva. Photo by Joe MacIndewar, iNaturalist, Creative Commons.
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