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Cheilosia cynocephala

 
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stuart
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Joined: 11 May 2005
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Location: Peterborough, UK

PostPosted: Sat May 28, 2005 5:39 pm    Post subject: Cheilosia cynocephala Reply with quote

Cheilosia cynocephala Loew, 1840

Identification ease/difficulty: 4

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 cynocephala Loew, 1840

Biology: The larvae mine the stems of Carduus nutans. Usually found in unimproved calcareous grassland where the larval foodplant occurs, often near rivers, streams or flushes. Adults fly low amongst the vegetation and visit a range of flowers including white umbels and yellow composites

Distribution: The distribution of this species mainly follows the chalk and limestone (on which its larval foodplant occurs) from East Anglia to the Mendips. Records are somewhat concentrated towards the south-west (Dorset, Somerset & Wiltshire), with few records from the chalk of south-east England, despite this being a relatively well-recorded area. There are thinly scattered records from Wales and northern England, and one locality in Scotland, near Edinburgh
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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 CYNOCEPHALA (Loew) NOTABLE

DISTRIBUTION Records widely scattered, most frequent in the south but with isolated ones as far north as East Lothian and Lanarkshire in Scotland.

HABITAT Mainly grassland and usually on chalk soils, possibly limestone soils in the north.

ECOLOGY Larvae phytophagous, reared from the musk thistle Carduus nutans, a plant most typically associated with calcareous soils. Adults recorded from May to September, suggesting the presence of two broods.

STATUS A scarce and very local species with about 20 known post 1960 sites, though possibly under recorded to some extent through a close resemblance to other commoner species, such as C. vernalis. Status revised from RDB3 (Shirt 1987).

THREAT Habitat loss to agriculture and coniferisation. Changes in the grazing management of chalk grassland leading to the invasion of scrub, coarse grasses and a subsequent fall in floristic richness and diversity, including the host plant.

MANAGEMENT This should concentrate upon maintaining a healthy thistle population, especially Carduus nutans. Rotational grazing policies are advised on grassland to produce a range of vegetation types.
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