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How mantis shrimp evolved many shapes with same powerful punch

Date:
February 26, 2015
Source:
Duke University
Summary:
The miniweight boxing title of the animal world belongs to the mantis shrimp, a cigar-sized crustacean whose front claws can deliver an explosive 60-mile-per-hour blow akin to a bullet leaving the barrel of a gun. A study of 80 million years of mantis shrimp evolution reveals how these fast weapons evolved their dizzying array of shapes -- from spiny and barbed spears to hatchets and hammers -- while still managing to pack their characteristic punch.
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Mantis shrimp attack their dinners with the help of spring-loaded claws.
Credit: Photo courtesy of Roy Caldwell

The miniweight boxing title of the animal world belongs to the mantis shrimp, a cigar-sized crustacean whose front claws can deliver an explosive 60-mile-per-hour blow akin to a bullet leaving the barrel of a gun.

Now, a Duke University study of 80 million years of mantis shrimp evolution reveals a key feature of how these fast weapons evolved their dizzying array of shapes -- from spiny and barbed spears to hatchets and hammers -- while still managing to pack their characteristic punch.

Duke researchers Philip Anderson and Sheila Patek studied nearly 200 mantis shrimp specimens representing three dozen species.

Mantis shrimp use a system of biological springs, latches and levers to power their fast strikes, enabling them to strike much more swiftly than would be possible with muscle power alone.

The team took careful measurements and calculated each specimen's ability to transmit muscular force and motion to the part of the claw that swings out to smash or spear their prey -- a mechanical property known as kinematic transmission.

When the researchers mapped their measurements onto the mantis shrimp family tree, they discovered that certain parts of the claw were more strongly associated with changes in strike mechanics than others -- enabling the other parts to evolve relatively independently without compromising the mantis shrimp's award-winning wallop.

"This research sheds new light on how these amazing movements evolved," Anderson said.

It suggests that mantis shrimp claws were able to evolve so many shapes because their mechanical properties are more affected by changes in some parts than others -- a pattern the researchers call "mechanical sensitivity."


Story Source:

Materials provided by Duke University. Note: Content may be edited for style and length.


Journal Reference:

  1. P. S. L. Anderson, S. N. Patek. Mechanical sensitivity reveals evolutionary dynamics of mechanical systems. Proceedings of the Royal Society B: Biological Sciences, 2015; 282 (1804): 20143088 DOI: 10.1098/rspb.2014.3088

Cite This Page:

Duke University. "How mantis shrimp evolved many shapes with same powerful punch." ScienceDaily. ScienceDaily, 26 February 2015. <www.sciencedaily.com/releases/2015/02/150226132149.htm>.
Duke University. (2015, February 26). How mantis shrimp evolved many shapes with same powerful punch. ScienceDaily. Retrieved May 8, 2017 from www.sciencedaily.com/releases/2015/02/150226132149.htm
Duke University. "How mantis shrimp evolved many shapes with same powerful punch." ScienceDaily. www.sciencedaily.com/releases/2015/02/150226132149.htm (accessed May 8, 2017).