Adults of Eupeodes corollae are known to travel long distances, making the species distinctly migratory. They are found across Europe, North Africa and Asia, so individuals can appear far from their breeding sites each year. Their flight period runs from May to September, extending year-round in southern Europe. This seasonal movement allows them to exploit a wide range of habitats as they move.
The larvae of Eupeodes corollae feed on aphids, providing a natural means of pest control. Because of this, the species has been used experimentally in glasshouses to curb aphid outbreaks and also to manage scale insects and aphids in fruit orchards. Its presence in farmland, orchards and suburban gardens means it can reduce pest numbers without chemical sprays. This biological control role is supported by its predatory larval diet.
Eupeodes corollae spans three continents, with records from Fennoscandia in the north to South Africa in the south, and from the Pacific coast of Japan to the Indian sub-continent. The species is distributed in Afghanistan, Africa as a whole, Bhutan, China, Japan, Pakistan, Europe as a whole and India. Its Palaearctic range stretches from Fennoscandia south to Iberia and the Mediterranean basin, while coastal Africa extends down to South Africa.
The hoverfly measures only 6-11 mm in body length, a size comparable to a small grain of rice. Its wings span 5 to 8·25 mm, giving it a compact, agile form that suits rapid manoeuvres among flowers. This small stature lets it exploit a wide range of habitats, from alpine grasslands to suburban gardens, while still travelling long distances during its migratory flights.
Male and female Eupeodes corollae display distinct abdominal markings: males bear square-shaped commas on tergites 3 and 4, while females show narrow commas. In addition, males have a very large, conspicuous pre-genital segment on the abdomen, whereas females possess white dust spots on the frons with a straight junction between black ground colour and yellow spots. These contrasting features make the sexes easy to tell apart in the field.
Sources
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As the warm sunlight dances across the meadow, the migrant hover fly, Eupeodes corollae, comes alive, its iridescent body glimmering like a shard of stained glass as it hovers, poised, in mid-air. With a mesmerizing agility, it darts and weaves, its delicate wings beating at a hypnotic pace, as it navigates the intricate tapestry of flowers and grasses that make up its world. In this fleeting, sun-kissed realm, the migrant hover fly reigns supreme, a tiny, whirring monarch, its very existence a testament to the beauty and wonder of the natural world.
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