CRINOID STEM 3 CRINOID STEM approx 4.5" long
Because many crinoids resemble flowers, with their cluster of waving arms & long stem, they are sometimes called sea lilies. But crinoids are not plants. Like their relatives--starfishes, sea urchins, sea cucumbers, and brittle stars--crinoids are echinoderms, animals with rough, spiny surfaces and a special kind of radial symmetry based on five or multiples of five.
Crinoids have had a long and successful history on earth since at least the beginning of the Ordovician Period, roughly 490 million years ago. Experts have identified hundreds of different crinoid species. Rarely are crinoids preserved in their entirety: once the soft parts of the animal decayed, sea currents generally scattered the skeletal segments. By far the most common crinoid fossils are the stem pieces as shown here.
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