Also known as Black Pearl Oyster, Black Winged Oyster, Brownlip Oyster, Common Wing Oyster, Giant Wing Oyster, Mollusc, Oyster, Pearl Oyster, Wing Oyster, Winged Oyster, Winged Pearl Oyster.
Found attached to gorgonians and black corals, over intertidal areas of coral and rocky reefs.
Often overgrown by other organisms, the length of the wing is variable.
They feed on plankton.
Length - 25cm
Depth - 0-35m
Widespread Indo-West Pacific
In some areas these oysters are cultivated to produce black pearls.
Most Bivalves are permanently anchored in fissures or depressions in the rock surface of the reef, some may become covered in algae and other marine life.
Other Bivalves swim free, either by a well developed foot or propelled along by a jet of water from their mantle cavity. (edit) Ref: https://en.wikipedia.org/wiki/Pteria_penguin