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Iriomote Ishigaki NP, Okinawa
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A living star-sand creature can move: an Iriomote observer recorded one shifting about 8 mm in 14 hours. It is a single cell, reaching threadlike pseudopods through its shell to travel and gather food.
Each star-shaped grain is the calcium-carbonate shell of a single-celled marine foraminifer—not a bit of weathered rock. Living foraminifera cling to seaweed or reef rubble; after they die, waves carry their shells ashore.
A 1986 study of beach samples found that many particles called “star sand” here were Calcarina gaudichaudii, not the classic star-shaped Baculogypsina. Their long spines can give them a tiny-UFO outline.
At the rocky edge, look up: reef limestone preserves winding burrows and trails made by ancient seafloor animals. The younger limestone filled tracks in older sandstone; erosion later exposed them from below.
