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The stalked crinoid spends most of its time sitting and catching food with the flowerlike wheel of feathery arms that have earned it and its relatives the nickname sea lilies. Scientists had known for decades that stalked crinoids sometimes move—but barely. They had been clocked at speeds no greater than 0.6 meter per hour.
Now, however, a video from a submersible dive off Grand Bahama Island reveals a speed demon, says Tomasz Baumiller of the University of Michigan in Ann Arbor.
"People were speechless," says William I. Ausich of Ohio State University in Columbus.