Biology
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It is known that adult females lay their eggs on to the surface of logs in flowing water. They seem to prefer logs with a diameter of at least 70cm, which are jammed at the edge of the stream, or which form part of a log-jam. The logs must be partially submerged, as the larvae seem to favour the wood along the water line.
Conservation
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This species is listed in the UK Biodiversity Action Plans (UK BAP), and is included on English Nature's Species Recovery Programme. Ultimately, more research into the cranefly's ecology will enable more direct species and habitat management to take place, and help to achieve the UK BAP target of ten viable populations by the year 2010.
Description
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Most people have experienced a cranefly or 'daddy long-legs' Tipula oleracea in the house at the end of the summer. Lipsothrix nigristigma resembles this much more familiar cousin, but is considerably smaller, and has a yellowish body.
Habitat
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This cranefly is associated with woodland streams where the larval stage is spent in wet and rotten fallen logs, especially those in log-jams.
Range
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This species is recorded in a number of countries throughout northern Europe, where it is generally associated with mountain regions. It is thought that this species may be the same as a crane fly (Lipsothrix nobilis) found in the alpine regions of Austria, Czechoslovakia, Germany, France and Yugoslavia. In Britain, it has only been found at a small number of sites in recent years near Telford in Shropshire.
Status
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Classified as Endangered in the UK.
Threats
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With so little known about this insect, it is difficult to be certain about the reasons for its scarcity. An important factor is the need for the cranefly to have access to semi-submerged, rotten wood. If this becomes unavailable through tidying-up operations, then the number of potential breeding opportunities is reduced. It is possible that it may also require sheltered locations.
Lipsothrix nigristigma
provided by wikipedia EN
Lipsothrix nigristigma is a species of cranefly in the genus Lipsothrix, native to England. It is known only from the type specimen taken in Lancashire in 1924, and from two localities near Telford in 1994.[1]
It was identified by Edwards in 1938.
Survey
In 2000, the two sites from which L. nigristigma was recorded in 1994 were resurveyed along with twenty or so similar sites in Shropshire and Montgomeryshire. The target species was located at eight (possibly nine) sites. The majority of sites are centred on southwest Telford with only two outlying sites.[1]
References
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Lipsothrix nigristigma: Brief Summary
provided by wikipedia EN
Lipsothrix nigristigma is a species of cranefly in the genus Lipsothrix, native to England. It is known only from the type specimen taken in Lancashire in 1924, and from two localities near Telford in 1994.
It was identified by Edwards in 1938.
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