Straw belle moth (Aspitates gilvaria gilvaria)

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Straw belle moth fact file

Straw belle moth description

KingdomAnimalia
PhylumArthropoda
ClassInsecta
OrderLepidoptera
FamilyGeometridae
GenusAspitates

The hindwings of this moth are white with a faint diagonal grey streak and a dot on the upper surface. The forewings have a slightly graduated buff colour with a more noticeable brown diagonal streak pointing to the apex of each wing. The female is slightly more strongly marked than the male but this is not immediately obvious in the field.

Size
Adult forewing: 32-39 mm
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Straw belle moth biology

The straw belle moth is a resident of the UK. It normally flies at dusk but, if disturbed, will fly during the day. The moth emerges in July and is on the wing until August. The eggs are laid on a number of different chalk grassland plants including, thyme, cinquefoil and wild parsnip.

The caterpillars hatch in September and spend the winter as very small larvae, re-emerging in spring. They pupate in June before hatching in July.

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Straw belle moth range

The straw belle moth has been recorded in most European countries and its wider range extends across Asia to Mongolia. In the UK it is now restricted to small fragments of the North Downs of Surrey and Kent. It has declined in numbers severely, having been recorded formerly in Devon, Somerset, Gloucestershire, Hampshire, Sussex, Middlesex and Cheshire.

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Straw belle moth habitat

This is a species which inhabits chalk downland, especially that which is regularly grazed, on which its food plants can grow.

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Straw belle moth status

Classified as Rare in the UK.

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Straw belle moth threats

This species has declined severely in recent decades, chiefly through loss of its habitat. This has been caused by a number of factors including road construction, housing and industrial development, and especially agricultural improvement to the calcareous grassland, which reduces the numbers of wildflower species. There has also been a decline in the traditional forms of grazing which have also led to habitat changes. There have been a number of cases of accidental and deliberate burning of the grasslands which support the straw belle moth.

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Straw belle moth conservation

As a result of the decline of the straw belle moth in the UK, it was introduced into English Nature's Species Recovery Programme. It is also listed as a UK Biodiversity Action Plan (UKBAP) priority species. In partnership with Butterfly Conservation, English Nature have drawn up a series of targets in an effort to save this species.

The remaining sites where the moth is found are all declared Sites of Special Scientific Importance (SSSIs) and the management agreements for these sites reflect the habitat requirements of the species. Two agri-environment schemes are available for landowners to encourage appropriate management of these sites and the aim is to achieve this by the year 2005. It is also hoped that by restoring other sites within the moth's former range, a re-introduction programme might be possible. Survey work, with the aim of identifying suitable locations and achieving the right type of land management, is currently underway.

View information on this species at the UNEP World Conservation Monitoring Centre.
The UK Biodiversity Action Plan for this species is available at UK BAP.
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Find out more

  • For more information see Butterfly Conservation:
    http://www.butterfly-conservation.org/
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    Authentication

    Information supplied by English Nature.

    http://www.english-nature.org.uk

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    Glossary

    Agri-environment schemes
    These schemes allow the government to compensate farmers for using methods that benefit the environment. The two main initiatives in the UK are the Countryside Stewardship Scheme and Environmentally Sensitive Areas. Since October 2000 these have formed part of the England Rural Development Programme (EDRP), administered by DEFRA, the Department of Environment Food and Rural Affairs. For more on these initiatives see: http://www.defra.gov.uk/erdp/erdphome.htm
    Calcareous
    Containing free calcium carbonate, chalky.
    Larvae
    Stage in an animal's lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
    Pupate
    The process of forming a pupa, the stage in an insect's development, when huge changes occur that reorganise the larval form into the adult form. In butterflies the pupa is also called a chrysalis.
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    References

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    Image credit

    Straw Belle  
    Straw Belle

    © Paul Waring

    Paul Waring
    Windmill View
    1366 Lincoln Road
    Werrington
    Peterborough
    PE4 6LS
    United Kingdom
    Tel: +44 (0) 1733 571 917
    paul_waring@btinternet.com

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