Georgette Douwma / Mantel of Spiny oyster (Spondylus varius). Indonesia. Indo-West Pacific.

Georgette Douwma / Kaleidoscopic image of Thorny oyster (Spondylus varians) pattern on mantle. Ceby, Malapascua Island, Philippines.

Georgette Douwma / Thorny oyster (Spondylus varians), pattern of mantle. North Sulawesi, Indonesia.

David Fleetham / Coral-boring scallop (Pedum spondyloideum) with colourful mantle. Yap, Micronesia.

Staffan Widstrand / Seashells collected from beach, Triton Bay, Mainland New Guinea, Western Papua, Indonesian New Guinea

Jeff Rotman / Fishermen harvesting scallops from a scallop dredge on a scallop boat. Cousins Island, Maine, USA, January. Model released.

Jeff Rotman / Fishermen harvesting scallops from a scallop dredge on a scallop boat. Cousins Island, Maine, USA, January. Model released.

Jeff Rotman / Fishermen harvesting scallops from a scallop dredge on a scallop boat. Cousins Island, Maine, USA, January. Model released.

Jeff Rotman / Fishermen harvesting scallops from a scallop dredge on a scallop boat. Cousins Island, Maine, USA, January. Model released.

Sue Daly / Queen scallop (Aequipecten opercularis) Isle of Man, July.

Sue Daly / Scallop (Pecten maximus) escaping from Spiny Starfish (Marthasterias glacialis) Isle of Man, July.

Sue Daly / Spiny Starfish (Marthasterias glacialis) preying on Scallop (Pecten maximus) Isle of Man, July.