Placuna placenta, commonly known as the windowpane oyster, is a bivalve mollusk found in shallow coastal waters of the Indo-Pacific region. It has a distinctive, flat, and translucent shell that resembles a windowpane, allowing light to pass through. This unique feature makes it popular in crafts and jewelry. The windowpane oyster primarily feeds on plankton and organic particles by filtering water through its gills. It plays a vital role in the marine ecosystem by contributing to water clarity and quality. Additionally, Placuna placenta is harvested for its shells, which are used in decorative items and as a source of calcium carbonate.