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Psilota anthracina

 
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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: Psilota anthracina Reply with quote

Psilota anthracina Meigen, 1822

Identification ease/difficulty: 3

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.

Psilota anthracina Meigen, 1822

Biology: On the Continent, the larvae have been found in sap runs on trees (Stubbs, 1996) and the female has been observed to oviposit in the exit hole of Cerambyx cerdo in an ancient living Quercus (Speight, 1998 quoting Doczkal, per. comm.). In Britain, it is restricted to sites with large numbers of ancient trees. Adults are elusive, but are sometimes found visiting Crataegus or Salix blossoms

Distribution: The great majority of records are from a few sites with large populations of ancient trees, such as Windsor Forest, the New Forest and Richmond Park, but there are recent records from Essex, Worcestershire, Warwickshire and Derbyshire. The adults are possibly overlooked by hoverfly recorders because of their close resemblance to shining blue-black muscids (e.g. Hydrotaea spp.)
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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 Insect Red Data Book, Shirt, 1987 Reply with quote

Datasheet from the Insect Red Data Book, Shirt (1989).

Psilota anthracina Meigen, 1822 VULNERABLE

Identification: Stubbs & Falk (1983), pp. 101 and 203, pl. 5:3.

Distribution: Southern England, principally the New Forest (Hampshire) and Windsor Forest (Berkshire).

Habitat and ecology: The larval ecology is unknown. Sites usually contain ancient trees so dead wood could be the breeding site (though apparently related genera feed in bulbs and herbaceous roots). The adults are normally found on hawthorn blossomCrataegus.

Status: A great rarity, only regularly ssen at Windsor Forest. It is difficult, in the absence of meaningful ecological information, to assess the stability of its status on sites.

Author: A.E. Stubbs.
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stuart
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Joined: 11 May 2005
Posts: 737
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).

PSILOTA ANTHRACINA Meigen VULNERABLE

DISTRIBUTION A small number of sites in southern England (Dorset, Wiltshire, Hampshire, Surrey, Essex, Berkshire, Warwickshire). The New Forest and Windsor are its stronghold.

HABITAT Broadleaved woodland and parkland, almost exclusively in ancient sites.

ECOLOGY Biology entirely unknown though the distribution suggests a possible link with dead wood. Adults recorded from April to June and characteristically visit the blossoms of hawthorn and sloe. A female was also swept from a lush ditch at Windsor.

STATUS Frequent at Windsor and the New Forest, with known additional post 1960 sites at: Bentley Woods (late 1960s) and possibly Barnridge Copse, Wiltshire; Chobham Common (1979) and Wisley RHS Gardens (1988), Surrey; Dagnam Park (1980s) and Weald Park (1985), Essex; Ryton Wood, Warwickshire (1989). A record from Richmond Park, Surrey is undated. The strongholds both suffer pressures from unsympathetic management, with large areas of the New Forest now being coniferised and continual removal of dead wood and old trees being a major problem at Windsor.

THREAT The clearance of ancient broadleaved woodland mainly for intensive forestry and agriculture and removal of dead wood. Shading out of rides and clearings within woodland.

MANAGEMENT Retain any dead wood and old trees within a site; maintain the presence of open rides and clearings with blossom for adult feeding and ditches or streams with a rich and varied vegetation.
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