NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Pentacrinites crinoid fossil. This fossil dates from the Jurassic (200 to 145 million years ago). Crinoids are marine echinoderms that appear as early as the Ordovician period (500 million years ago). They consists of stalks attached to the seabed, with with feathery arms reaching outwards to capture food. Thousands of extinct crinoid species have been found as fossils, but only a few hundred species still exist today.
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