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Triglyphus primus

 
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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: Triglyphus primus Reply with quote

Triglyphus primus Loew, 1840

Identification ease/difficulty: 3

StatusSources of information
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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 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.

Triglyphus primus Loew, 1840

Biology: The larvae are aphidophagous, and appear to be specific to the galls induced by Cryptosiphum artimisae on Artemisia vulgaris. Adults are elusive, but tend to be found visiting flowers such as white umbels or resting on sunny foliage in the sorts of places that Artemisia grows. These include urban waste ground, abandoned quarries and disused railway lines, but also semi-natural grassland with an element of disturbance. For example, they have been found on Salisbury Plain near tank-damaged areas

Distribution: Rather scarce and local in south-east Britain from around Dorset and Wiltshire eastwards, and north to about a line between the Mersey and the Humber. A number of recent records are associated with urban waste ground, for example in Sheffield and East London
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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 9:08 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).

TRIGLYPHUS PRIMUS Loew NOTABLE

DISTRIBUTION Records widely scattered over southern England as far north as Yorkshire.

HABITAT A wide range of habitats have been recorded including woodlands ruderal sites and gardens, though no particular preferences are apparent.

ECOLOGY Larvae aphidophagous and have reared from aphids on mugwort Artemisia vulgaris. Adults recorded from April to early October and may be found visiting the flowers of umbels or resting on foliage, though by all accounts this appears to be a fly with a particularly secretive nature.

STATUS Very local, occasionally abundant at a site and possibly overlooked to some extent through the small size and secretive habits. About 30 known post 1960 sites.

THREAT Clearance of woodland and drainage of marshy areas for agriculture, intensive forestry and urban development.

MANAGEMENT Attempt to maintain a mosaic of vegetation types including open rides and clearings in woods, copses in more open areas, and encourage a rich vegetation at such interfaces. Retain any marshy areas.
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