Rare crinoid fossil preserves delicate tube feet from over 450 million years ago

University of Oklahoma paleontologists have identified a crinoid fossil with preserved soft tissue, including tube feet, dating back more than 450 million years. This is only the second known crinoid fossil with such preservation and the oldest example found. The find offers a rare glimpse into the anatomy and behavior of early reef animals.

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The specimen's tube feet offer direct evidence of how this ancient crinoid captured food particles from surrounding water currents. Because soft tissues decay rapidly after death, their survival typically requires swift burial in oxygen-poor sediment, conditions that halt microbial breakdown. This particular fossil likely formed under such exceptional circumstances, preserving structures that normally vanish within days of an organism's demise.

Comparing the ancient tube feet with those of living crinoids reveals that feeding anatomy has shifted considerably over hundreds of millions of years. The