Violet click beetle (Limoniscus violaceus)

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Violet click beetle
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Violet click beetle fact file

Violet click beetle description

KingdomAnimalia
PhylumArthropoda
ClassInsecta
OrderColeoptera
FamilyElateridae
GenusLimoniscus

The violet click beetle (Limoniscus violaceus) is a 12 millimetre long black beetle with a faint blue reflection. It gets its name from the family habit of springing upwards with an audible click if it falls on its back. There are some 160 species living in Europe and their ability to 'click' themselves back on their feet is due to some interesting insect mechanics. Underneath members of the click beetle family is a groove and a peg. If the beetle finds itself inverted it puts a powerful muscle under tension. The peg is slammed into the pit and the contraction throws the beetle into the air, producing the audible click. The larvae, in common with other family members are known as 'wireworms' because of their proportions, and their colour, which is like rusty wire.

Size
Length: 12 mm (adult)
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Violet click beetle biology

Very little is known of the habits of the violet click beetle, beyond that of its preferred habitat. There is a possible association with bird and animal nests, and it is thought that adult beetles are nocturnal, and feed on plant nectar.

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Violet click beetle range

The violet click beetle is extremely rare. It is found in only a few locations in Europe and at three sites in Britain. One of these is in Windsor Forest, another on Bredon Hill in Worcestershire, and the third is a small wood in Gloucestershire.

You can view distribution information for this species at the National Biodiversity Network Gateway.
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Violet click beetle habitat

The violet click beetle is found only in the heart of very old and decayed trees. However, it only seems to favour trees where the decaying wood has attained a consistency like damp soot. This condition tends to be very rare in most woods, and in Britain has only been found in beech and ash trees.

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Violet click beetle status

The violet click beetle is classified as Endangered (EN) on the IUCN Red List (1).

IUCN Red List species status – Endangered

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Violet click beetle threats

The violet click beetle has always been rare in the UK in historic times, and has not been found in the sub-fossil record to date. This suggests it has been rare for a very long time. However, the particular conditions the beetle requires are hardly ever found, and the felling of old trees for safety reasons means that its habitats are becoming even rarer.

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Violet click beetle conservation

Efforts in the UK have concentrated on providing more sites for the violet click beetle. There are few suitable trees on the British sites at Bredon Hill and Windsor. Some trees were found to contain larvae but none of the others seemed likely to provide the right conditions. Following the great storm of 1987, one old hollow beech in Windsor Forest blew down. Ted Green, the (then) warden, managed to re-erect it by using another living tree as support and then began to experiment with various 'rotting' ingredients to attempt to create the conditions needed by the violet click beetle. After seven years, Ted's efforts bore fruit and five larvae were found inside his prepared tree. Plans are well under way to erect and prepare more suitable trees and even artificially 'age' some. This is taking place with the help of dead wood invertebrate and fungus specialists as part of English Nature's Species Recovery Programme.

There may be further information about this species available via the National Biodiversity Network Gateway.
The UK Biodiversity Action Plan for this species is available at UK BAP.
View information on this species at the UNEP World Conservation Monitoring Centre.
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Authentication

Information supplied by English Nature.

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

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Glossary

Fungus
Fungi are one of the taxonomic kingdoms, separate from plants and animals. They obtain nutrients by absorbing organic compounds from the surrounding environment.
Invertebrate
Animals with no backbone.
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.
Nocturnal
Active at night.
Sub-fossil
Relating to remains of organisms that have not been petrified (turned to stone), and usually associated with the post-glacial period, i.e. within the past 10 - 12000 years.
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References

  1. IUCN Red List (April, 2011)
    http://www.iucnredlist.org/
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Image credit

Violet click beetle  
Violet click beetle

© Roger Key

Dr Roger Key
Tel: +44 (0) 1845 567 292
key_r_s@yahoo.co.uk

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