To 20 cm in size. Shell aperture deeply scalloped in even zigzag pattern. Shell usually covered with encrusting sponge of different colors. Attached to rocks, coral, wrecks and dock pilings. Leopard's Shark dive site in Lankayan Island, Sabah (Borneo).
The cockscomb oyster, ''Lopha cristagalli'', is a species of marine bivalve molluscs in the family Ostreidae.