NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Fossil crinoid, watercolour by Sarah Stone (1760-1844). Crinoids, or sea lilies, are marine echinoderms that have been in existence for 500 million years. They attach themselves to the sea floor with their stems and use their feathery arms to filter food from the water.
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