Plenty of robots are inspired by existing animals, but not as many take their cue from extinct creatures. To design their own new machine, Carnegie Mellon University researchers looked over 500-million years back in time for guidance. Their result, presented during the 68th Biophysical Society Annual Meeting, is an underwater soft robot modeled after one of the sea urchin’s oldest ancestors.
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Pleurocystitids swam the oceans around half a billion years ago—about the same time experts now believe jellyfish first appeared. While an ancient precursor to invertebrates such as sea stars, pleurocystitids featured a muscular, tail-like structure that likely allowed them to better maneuver underwater. After studying CT scans of the animal’s fossilized remains, researchers fed the data into a computer program to analyze and offer mobility simulations.
While no one knows for sure exactly how pleurocystitids moseyed around, the team determined the most logical possibility likely involved side-to-side sweeping tail motions that allowed it to propel across the ocean floor. This theory is also reinforced by fossil records, which indicate the animal’s tail lengthened over time to make them faster without the need for much more energy expenditure. From there, engineers built their own tail-touting, soft robot pleurocystitid.
To the casual viewer, footage of the mechanical monster clumsily inching across the ground may seem to hint at why the pleurocystitid is long gone. But according to Richard Desatnick, a Carnegie Mellon PhD student under the direction of mechanical engineering faculty Phil LeDuc and Carmel Majidi, the ancient animal likely deserves more credit.
“There are animals that were very successful for millions of years and the reason they died out wasn’t from a lack of success from their…
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