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Xylota xanthocnema

 
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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: Xylota xanthocnema Reply with quote

Xylota xanthocnema Collin, 1939

Identification 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.

Xylota xanthocnema Collin, 1939

Biology: The larvae have been found in rot holes of Taxus. It usually occurs in or near ancient deciduous woodland, although, according to Speight (1998) it favours sites with well-drained soils. Adults are found running rapidly over foliage or basking on sunlit trunks in clearings. There appear to be no records of this species visiting flowers

Distribution: Rare and largely confined to the southern half of Britain, but also found in old woodland on limestone in Yorkshire (Stubbs, 1996). It was found to be locally abundant in some woods near Coventry by staff of the Herbert Art Gallery & Museum in the early 1980s
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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).

XYLOTA XANTHOCNEMA Collin NOTABLE

DISTRIBUTION Widely recorded in the south, extending as far north as Shropshire and Leicestershire.

HABITAT Broadleaved woodland with a requirement for old or diseased trees and possibly dead wood.

ECOLOGY Larvae have been reared from the exudate and rot-holes of yews, though a recent observation from Windsor Forest, Berkshire refers to several males around water filled holes between visible roots of an old beech. They would hover about a foot above the holes, or guard the entrance, frequently going down to walk around the waters edge (D. Moore, pers comm). Such situations in broadleaved trees may prove to be a more typical breeding location than yew rot holes, as it is frequently taken at sites where yews are absent. Adults recorded from June to August and are most easily observed running about sunlit foliage.

STATUS Extremely local though not as rare as formerly believed, with in excess of 35 post 1960 sites. The resemblance to the commoner X. sylvarum may have led to under recording in the past, and recent records are thus comparatively frequent.

THREAT The clearance of woodlands for agriculture or intensive forestry and the removal of old trees and dead wood.

MANAGEMENT Retain any old trees with rot holes, water filled trunks or roots. Maintain the presence of open rides and clearings.
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