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Britain’s rarest spider makes comeback, and eats mother.

04/06/2008 17:19:38 news/spider_heathland

June 2008.  By the early nineties the ladybird spider had almost been wiped out in Britain due to habitat loss, but now Forestry Commission wildlife experts are celebrating its burgeoning come-back. In 1993 it was thought there were as few as only 50 ladybird spiders left in the country.

The species' last stronghold in the South West was a 50-metre-wide patch of heath deep in a Forestry Commission woodland where around 30 individuals still survived. The foresters' battle to save the spiders began when they cleared rhodendron and pines from around the site to give them more breeding room. By 1996 conservationists counted 139 ladybird spider burrows as the arachnids began expanding out across the area.

Forester Laurence Degoul, said: "Now we are looking for completely new habitats into which spiders from the site can be relocated. Thanks to our extensive heathland restoration work in the county there are a lot of places to choose from. But it is crucial that we pick a spot where the conditions are absolutely perfect."

Miss Degoul said that plans had originally been in place to populate the county's heaths with spiders bred in captivity from stock imported from Denmark. But she said that Dorset's own spiders seemed to be doing so well that some of them would be selected for the move instead. The creatures get their curious name from the four ladybird-like black spots the half-inch-long males have on their bright red backs. The spiders' webs form a funnel, which provides a home at one end and a deadly trap for prey at the other where the silken threats spread out.

Hatchlings eat their mother

Female ladybird spiders lay around 80 eggs during the summer into a cocoon deep in their nests. Once hatched the spiderlings turn on their mother and eat her. The brood then heads out to establish their own territories elsewhere. It takes them up to four years to reach maturity.

 

The Crucifix Ground Beetle

- The Crucifix Ground Beetle, 8-10mm in length, is largely black and very bristly. In shape, it has a characteristic bug-eyed appearance and a broad thorax. The English name was inspired by the large red spots on the wing cases which extend over the margins, giving the appearance of a black cross against a red background. We know very little about the life of the crucifix ground beetle. It is nocturnal in its activities, like most ground beetles, and seems to like sheltering under pieces of driftwood or discarded plastic sheets during the day. This beetle is a predatory species that probably feeds mainly on semi-aquatic snails, but its principal prey isn't known for certain.

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