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Meligramma trianguliferum

 
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stuart
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Joined: 11 May 2005
Posts: 737
Location: Peterborough, UK

PostPosted: Sat May 28, 2005 5:39 pm    Post subject: Meligramma trianguliferum Reply with quote

Meligramma trianguliferum (Zetterstedt, 1843)

NomenclatureIdentification ease/difficulty: 4

StatusHabitat indicator statusSources of information
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stuart
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Joined: 11 May 2005
Posts: 737
Location: Peterborough, UK

PostPosted: Sun May 29, 2005 8:41 am    Post subject: Species account from the Provisional atlas Reply with quote

Species account from Provisional atlas of British hoverflies, Ball & Morris, 2000.

Meligramma trianguliferum (Zetterstedt, 1843) Syrphus triangulifer Zetterstedt in Coe (1953), Melangyna triangulifera (Zetterstedt) in Stubbs & Falk (1983)

Biology: The larvae, which are convincingly camouflaged as bird droppings (see photograph in Rotheray, 1994), feed on a range of aphids on trees, especially fruit trees and shrubs. Generally found around trees along woodland rides and edges or amongst scrub, including isolated patches of scrub on heathland and moorland. Adults appear elusive and may be arboreal, but can be found visiting flowers, especially white umbells

Distribution: Scarce but widely distributed in England, with a tendency to be more frequent in the south. There are very few, widely scattered records in northern England, Wales and Scotland
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stuart
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Joined: 11 May 2005
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Location: Peterborough, UK

PostPosted: Sun May 29, 2005 9:09 am    Post subject: Data sheet from National Review of Diptera, Falk, 1991 Reply with quote

Datasheet from the Review of Scarce and Threatened Diptera, Falk (1991).

MELANGYNA TRIANGULIFERA (Zetterstedt) NOTABLE

DISTRIBUTION Records scattered widely in England and Scotland as far north as Edinburgh.

HABITAT Broadleaved woodland, even gardens.

ECOLOGY Larvae aphidophagous and have been found on Prunus trees and bushes feeding on various species of aphids. They are black and white, closely resembling bird droppings in the field. Adults are recorded from April to September, probably as two broods and frequent the flowers of umbels although they have also been recorded from the blossom of privet.

STATUS A local but widespread species with about 25 known post 1960 sites. The adults appear to be elusive and work in Edinburgh has shown that larvae are rather more easy to find, possibly reflecting a canopy dwelling habit in the adult.

THREAT Clearance of broadleaved woodland for agriculture, intensive forestry and urban development. Shading out of rides and clearings within woodlands.

MANAGEMENT Maintain rides and clearings in an open condition, ensuring the presence of shrubs and trees such as Prunus and plenty of flowers for adult feeding.
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