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estrella de mar
Fossil Sand Dollar - Heliophora orbiculus Sand dollars are flat, round marine animals related to sea urchins, sea stars, and other echinoderms. When sand dollars are living, they have a skin of moveable spines covering the entire test.These pores are used to move sea water into its internal water-vascular system, which is what allows the creature to move. * Origin: Dachla, Morocco * Age: 15 Million Years Old * Period: Miocene Epoch
Sand under electron microscope
This is what ocean sand looks like magnified 250 times.