Study: One Wasp Takes Control of Another

Crypt keeper wasps appear to command crypt gall wasps to dig exit tunnels on their behalf.

Jef Akst
Jef Akst

Jef Akst is managing editor of The Scientist, where she started as an intern in 2009 after receiving a master’s degree from Indiana University in April 2009 studying the mating behavior of seahorses.

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The crypt-keeper wasp, Euderus setRYAN RIDENBAUGH AND MILES ZHANG/UNIVERSITY OF CENTRAL FLORIDACrypt gall wasps (Bassettia pallida) lay their eggs in the branches of oak trees, where wasp larvae develop within compartments called crypts and the wasps eventually chew their way out as adults. But Scott Egan and Kelly Weinersmith of Rice University found that another wasp—a new species, much smaller than the crypt gall wasps and a beautiful iridescent blue—often occupy the crypts with the B. pallida larvae. Upon further investigation, the researchers learned that the small, blue wasp somehow commands the crypt gall wasp to dig a smaller–than-usual tunnel out of the oak branch. When the larger insect tries to escape, it gets stuck, plugging the hole with its head. The smaller wasp then eats the crypt gall wasp alive and ultimately exits through the hole.

The researchers describe the new species, which...

“This is the type of science I love; it leaves us hungrily asking more questions,” David Hughes from Pennsylvania State University, who studies manipulative parasites, told The Atlantic. For example, “how does this wasp get its egg into its soon-to-be excavator? And how does it do that so precisely to stop the activity at a stage where the hole is large enough just for a head to block, but not for the body of the manipulatee to emerge?”

See “Animal Mind Control,” The Scientist, January 2012.

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