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Criorhina asilica

 
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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: Criorhina asilica Reply with quote

Criorhina asilica (FallÚn, 1816)

Identification ease/difficulty: 2

StatusHabitat indicator statusSources of information
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Last edited by stuart on Sun Jan 22, 2006 11:02 am; edited 2 times in total
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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.

Criorhina asilica (FallÚn, 1816)

Biology: Larva undescribed, but has been reared from heartwood debris in a cavity in *. Adults, which are convincing hive-bee mimics, are usually found in or near woodland with overmature trees and can often be seen visiting flowers, especially Crataegus, or sitting or flying around the base of stumps and dead or dying trees. Males patrol flowering trees and shrubs at some height

Distribution: Widespread but scarce. More frequent in well-wooded districts of southern Britain, but extending northwards to the Tyne Valley
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stuart
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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).

CRIORHINA ASILICA (Fallen) NOTABLE

DISTRIBUTION Records widely scattered in England as far north as Berwickshire, predominating in the south; also South Wales (Glamorganshire).

HABITAT Broadleaved woodland with a requirement for dead wood. Occasionally on fens such as Woodwalton where it can be quite common, probably reflecting a continuity of suitable dead wood.

ECOLOGY Larvae develop in dead wood and at Windsor adults are particularly frequent around well rotten, fallen beech trunks. Adults recorded from April to July and visit spring blossom such as hawthorn Crataegus and rhododendron Rhododendron.

STATUS A very local southern species with about 45 known post 1960 sites. A useful indicator of dead wood continuity. It can occur in good numbers at sites such as Windsor Forest, Woodwalton Fen and other old woods.

THREAT Clearance of old woodland for agriculture or intensive forestry and removal of dead wood. The shading out of rides and clearings within woods.

MANAGEMENT Retain any dead wood, particularly fallen trunks or large limbs in shaded conditions, and ensure continuity of these in future by maximising the number of post-mature trees. Maintain open rides and clearings in woods with blossoms for adult feeding.
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