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Tiny wasps snack on deadly spiders

Researchers have recently described the spider-eating habits of a previously little-known Australian wasp. The new study was spurred by the curiosity of a 9-year-old boy.

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A redback spider-hunting wasp (Agenioideus nigricornis) dragging its paralyzed prey back to its nest.

Florian and Peter Irwin

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Throughout Australia, a tiny wasp stings and paralyzes redback spiders before laying an egg that develops into a larva and slowly devours the dangerous arachnids, Australian researchers have announced.

The find is good news for Australians watching out for the redbacks, a type of spider whose bite can potentially be lethal.

The wasp was first described scientifically in 1775 by a Danish entomologist, thanks to samples collected in 1768 in Australia by Captain James Cook. But since then, "scientists have largely forgotten about the wasp," said professor Andy Austin, a researcher at Australia's University of Adelaide, in a statement. 

That was until a couple years ago, when Florian Irwin, age 9, spotted a tiny wasp dragging a redback spider back to its nest in the boy's backyard in Beaconsfield, Western Australia. His father, Peter Irwin, a lecturer of veterinary medicine at Murdoch University, photographed the site and took samples of the animals, which made their way to Austin. 

Previously known only by its Latin name, Agenioideus nigricornis, it's now known as the redback spider-hunting wasp.

"We're very excited by this discovery, which has prompted us to study this species of wasp more closely," Austin said. "It's the first record of a wasp preying on redback spiders, and it contributes greatly to our understanding of how these wasps behave in Australia." His findings are detailed in the September issue of the Australian Journal of Entomology.

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