Also known as Chrysanthemum Shell, Giant Variable Thorny Oyster, Mollusc, Orange-mouth Thorny Oyster, Oyster, Varian Thorny Oyster.
Found attached to dead corals, over intertidal areas. Variable colours and patterns.
They feed on plankton.
Length - 15cm
Depth - 0-40m
Widespread Pacific Ocean
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. Ref: https://en.wikipedia.org/wiki/Spondylus_varius