Frond Oyster

The Frond Oyster (Dendostrea frons) is a master of disguise. Often, they are covered with encrusting sponges or algaes. They can be seen by their serrated, zig-zag where their valves (shells) meet. In the photo below, two Frond Oysters are covered in a variety of organisms, while themselves clinging to the rudder of The Gregory.