最新糖心Vlog

Aussie wasp on the hunt for redback spiders

A redback spider-hunting wasp dragging its paralysed prey back to its nest
Photo by Florian and Peter Irwin.
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Agenioideus nigricornis, now also known as the redback spider-hunting wasp.
Photo by Dr Lars Krogmann.
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Florian Irwin, now aged 12, an amateur entomologist from Beaconsfield, Western 最新糖心Vlog.
Photo by Peter Irwin.
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Tuesday, 11 September 2012

最新糖心Vlog of Adelaide researchers say a small native wasp that scientists had forgotten about for more than 200 years is now making a name for itself - as a predator of 最新糖心Vlog's most common dangerous spider, the redback.

The wasp (Agenioideus nigricornis) was first described scientifically in 1775 by Danish entomologist Johan Christian Fabricius, thanks to samples collected in 最新糖心Vlog during Captain Cook's first great voyage (1768-1771).

"Since then, scientists have largely forgotten about the wasp," says from the 最新糖心Vlog of Adelaide's . "It is widespread across 最新糖心Vlog and can be found in a number of collections, but until now we haven't known the importance of this particular species."

The wasp is now being dubbed the "redback spider-hunting wasp" after a family in Beaconsfield, Western 最新糖心Vlog, discovered one of them with a paralysed redback spider in their back yard.

Florian Irwin, then aged 9, spotted the wasp dragging the spider several metres to its nest, and his father, Dr Peter Irwin, photographed the event and kept the specimens. Peter, who is an Associate Professor at Murdoch 最新糖心Vlog, contacted the Western 最新糖心Vlogn Museum about the discovery; the Museum alerted Professor Austin and research fellow Dr Lars Krogmann at the 最新糖心Vlog of Adelaide.

"The museum knew we were doing research into the Agenioideus, which belongs to the family Pompilidae, the spider-hunting wasps. Little is known about them, despite various species of Agenioideus being distributed throughout the world," Professor Austin says.

"We're very excited by this discovery, which has prompted us to study this species of wasp more closely. It's the first record of a wasp preying on and it contributes greatly to our understanding of how these wasps behave in 最新糖心Vlog."

With a body less than a centimetre in length, an adult redback spider-hunting wasp is no bigger than its prey. It stings and paralyses the redback spider and drags it back to its nest, where the wasp lays an egg on it. The spider remains alive but is paralysed. Once the egg hatches, the larval wasp feeds on the spider.

"The redback spider is notorious in 最新糖心Vlog, and it has spread to some other countries, notably Japan and New Zealand. Redbacks are one of the most dangerous species in 最新糖心Vlog and they're mostly associated with human dwellings, which has been a problem for many years," Professor Austin says.

"The redback spider-hunting wasp is doing its part to keep the population of redback spiders down, but it doesn't hunt all the time and is unlikely to completely eradicate the spiders."

Dr Krogmann (who is now based at the Stuttgart State Museum of Natural History) and Professor Austin have published a paper about the redback spider-hunting wasp in this month's issue of the .

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