Crawling stalked crinoid (sea lily), Grand Bahama Isle.
“Here, we provide evidence collected in situ by submersible near Grand Bahama Island at a depth of 420 m for a different mode of crawling in stalked crinoids. Its most striking feature is a speed two orders of magnitude greater (~10-30 mm sec-1) than previously observed.”
“STALKED CRINOID LOCOMOTION, AND ITS ECOLOGICAL AND EVOLUTIONARY IMPLICATIONS”, Baumiller & Messing, Paelaeontologica Electronica 2007
I’ve seen this before, but it remains one of the weirdest, creepiest and most fascinating thing I’ve ever come across. Echinoderms are full of surprises™.