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Placuna placenta is a highly asymmetrical bivalve with a characteristically thin, translucent shell often used in handicrafts such as lampshades. It lives mostly on mangrove coasts from the Arabian sea to the coast of China, preferring a muddy substrate. Lacking a byssus, P. placenta does not anchor itself to its substrate, but lies free at the mercy of the currents. P. placenta is a filter feeder and has a free-floating, planktic larva before settling and entering its adult stage.