English: A live Sand dollar, species Mellita longifissa), at low tide on the beach at Playa Grande on the Pacific coast of Costa Rica
23. February 2005
Sand dollars are flat sea urchins. When you find sand dollars on a beach, the white ones are the old empty shells or tests, having died, lost their covering of velvety spines and having been bleached white by the sun. The live ones are dark and completely covered in very small spines
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2005-06-28 20:26 Gerhard H 1207×1032×??? (342751 bytes) {{GFDL}} Live Sanddollar at Beach of Playa Grande, Costa Rica 23. Februar 2005
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