Scientists have unearthed the oldest known fossilized tube feet in crinoids—commonly known as sea lilies—preserved for roughly 452 million years. These soft tissues, typically lost to decay, were found intact in a surprising discovery detailed in a new study published in Royal Society Open Science.
Tube feet are small, flexible projections used by echinoderms like starfish and sea urchins for locomotion, feeding, respiration, and sensing their environment. Crinoids have a lengthy fossil record, but previous specimens almost exclusively preserved hard skeletal parts, making this finding a rare window into their soft anatomy.
The fossils provide direct evidence of how these ancient animals lived, suggesting their tube feet functioned similarly to those of modern echinoderms. This challenges assumptions about the limits of soft-tissue preservation in deep time and hints at conditions that might allow such delicate structures to survive.
These findings could reshape understanding of crinoid evolution and ecology in Ordovician seas. They also raise questions about what other soft-bodied features might be hidden in the fossil record, waiting for similar preservation conditions to be recognized.
Experts caution that the rarity of such preservation means interpretations remain tentative, but the study opens new avenues for investigating ancient marine life.