Pascal Kobeh / Necklace starfish (Fromia monilis) on variable thorny oyster (Spondylus varius), Maldives, Indian Ocean. This starfish is a predator of oysters.

Pascal Kobeh / Close-up of a Variable thorny oyster (Spondylus varius / varians) on a coral reef, Maldives. Indian Ocean.

Juergen Freund / Oyster {Lophia folium} Philippines

Philippe Clement / Indian oyster (Pleurotus pulmonarius) fungi on broadleaf tree trunk in forest in autumn, Flanders, Belgium. October.

Philippe Clement / Indian oyster (Pleurotus pulmonarius) fungi on broadleaf tree trunk in forest in autumn, Flanders, Belgium. October.

Willem Kolvoort / Flag pen shell (Atrina vexillum) in Passe Magnan / Magnan channel, Aldabra, Indian Ocean

Willem Kolvoort / Giant honeycomb oysters (Hyotissa hyotis) in Bijoutier reef, Byjoutier Island, Seychelles, Indian Ocean