SCOTLAND: The Big Picture / Blue mussels (Mytilus edulis) with encrusting marine life, Sula Sgeir, Scotland. UK, July

SCOTLAND: The Big Picture / Curled octopus (Eledone cirrhosa) amongst a horse mussel bed (Modiolus modiolus) Shetland, Scotland, UK, August.

Alex Hyde / Colony of Common Mussels (Mytilus edulis) growing on striated rock formation exposed at low tide. Cornwall, England, UK. Highly commended in the Coast and Marine Category of the British Wildlife Photo...

Nick Upton / Dense bed of Common mussels (Mytilus edulis) exposed at low tide on rocks fringing a sandy beach, Godrevy, Cornwall, UK, April.

Gary Bell/ Oceanwide / Mediterranean Mussel (Mytilus galloprovincialis) group, Port Phillip Bay, Mornington Peninsula, Victoria, Australia

SCOTLAND: The Big Picture / Yellow sun star (Solaster endeca) amongst Brittle stars (Ophiothrix fragilis) on a Horse mussel bed (Modiolus modiolus) Sheltand Islands, Scotland, UK, September.

SCOTLAND: The Big Picture / Horse mussel bed (Modiolus modiolus) with Brittle stars (Ophiothrix fragilis),Edible crab (Cancer pagurus) and Northern sea urchin (Strongylocentrotus droebachiensis) Sheltand Islands, Scotland, UK, S...

SCOTLAND: The Big Picture / Horse mussels (Modiolus modiolus) with brittle stars (Ophiothrix fragilis), Shetland, Scotland, UK, August.

Jaymi Heimbuch / Leaf Barnacle (Pollicipes polymerus) group, California Mussels (Mytilus californianus), and White Acorn Barnacles (Balanus glandula), Lincoln City, Oregon

Jaymi Heimbuch / California Mussel (Mytilus californianus) group, Yaquina Head Outstanding Natural Area, Newport, Oregon

Nick Upton / Kelp fly (Fucellia maritima) on Mussel (Mytilus edulis) shell exposed at low tide. Treyarnon Bay, Cornwall, England, UK. September.

Paul Williams / Ochre starfish (Pisaster ochraceus) Goose barnacles (Pollicipes polymerus) California mussel (Mytilus californianus) and Giant green anenome (Anthopleura xanthogrammica) in rock pool, Vancouver Island...