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Anasimyia lunulata

 
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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: Anasimyia lunulata Reply with quote

Anasimyia lunulata (Meigen, 1822)

Identification ease/difficulty: 4

StatusSources of information
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stuart
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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.

Anasimyia lunulata (Meigen, 1822) Helophilus lunulatus Meigen in Coe (1953)

Biology: Larvae are of the rat-tailed type and live principally in more acid localities than is typical for other members of the genus including valley bogs and cut-over bogs where vegetation is regenerating. It is possible that sites with some base influence are preferred and this might account for the restricted distribution of this species. Adults are rarely found far from the waters edge and often perch on floating leaves. Visits Caltha, Menyanthes, and white umbels

Distribution: Most recent records are from west Wales where it can be abundant at some sites, although there is a scattering elsewhere, including South Uist, Cheshire, Dorset and the New Forest. There are old records from eastern Britain including East Anglia, but some of these may stem from confusion with A. interpuncta which was not added to the British list until 1981 (Stubbs, 1981)
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stuart
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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).

ANASIMYIA LUNULATA (Meigen) NOTABLE

DISTRIBUTION Records widely scattered in England, Wales and Scotland (including the Outer Hebrides). Not recorded in south east England (apart from Thursley Common NNR) where it seems to be replaced by A. interpuncta (reflecting the comparative lack of bogs in this region).

HABITAT Closely associated with boggy pools and ditches, including those on damp lowland heathland.

ECOLOGY The larvae are aquatic, possibly developing amongst the marginal vegetation of pools. Adults recorded from May to August.

STATUS Exceedingly local with about 20 known post 1960 sites scattered throughout Britain. A decline seems apparent, especially in areas such as the New Forest, though recent recording efforts in South Wales have demonstrated it is not infrequent in some parts, such as Carmarthenshire and it may be under recorded in Wales generally.

THREAT The drainage of bogs through agricultural reclamation and for afforestation. A fall in water level will also encourage scrub invasion. Clearance of marginal vegetation from water edges.

MANAGEMENT Maintain a high, stable water level in bogs with pools and ditches and prevent scrub invasion.
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