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Cheilosia nebulosa

 
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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: Cheilosia nebulosa Reply with quote

Cheilosia nebulosa (Verrall, 1871)

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 8:40 am    Post subject: Species account from the Provisional atlas Reply with quote

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

Cheilosia nebulosa Verrall, 1871

Biology: The larvae of this species remain unknown. Adults are found visiting flowers such as Salix catkins along woodland rides and edges, often near carr or marshes. Males hover high up beside flowering Salix or Crataegus bushes

Distribution: Very scarce but widely scattered north to central Scotland
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stuart
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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).

CHEILOSIA NEBULOSA (Verrall) RARE

DISTRIBUTION Records widely dispersed in England, extending north to Easterness in Scotland, and also to Pembrokeshire and Merionethshire in Wales.

HABITAT Broadleaved woodland, in particular rides, clearings and woodland edge beside marshy ground.

ECOLOGY Larvae probably phytophagous though host plant unknown. Larvae probably develop in composites such as thistles Cardus and Cirsium. Adults recorded from early April to mid May and are most easily observed at sallow blossom with males often hovering nearby at heights of about 10 ft. The flight period suggests only a single brood.

STATUS Widespread but exceedingly local with about a dozen known post 1960 sites and a decline seems to have occurred. The early flight period of the adult suggests it could be under recorded to some extent especially in areas such as Wales. It used to be reasonably regular at Chippenham Fen NNR, Cambridgeshire, but recent information is sparse.

THREAT Clearance of woodland and drainage of adjacent marshes for agricultural improvement or intensive forestry. Scrub invasion of marshy areas, rides and clearings.

MANAGEMENT Maintain a high, stable water level in marshy areas, open rides and clearings in woods and ensure a rich and varied flora containing thistles.
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