Michel Roggo / Watermilfoil (Myriophyllum spicatum) with some stems supporting clusters of Zebra mussel (Dreissena polymorpha) Lake Neuchatel, Switzerland. Highly commended in the Plants category of the Wildlife Pho...

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

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...

Ingo Arndt / Bed of Blue mussels (Mytilus sp.) densely packed together on rock, Lamberts Bay, South Africa

Georgette Douwma / Cock's comb oyster (Lopha cristagalli) covered with encrusting sponge on artificial reef. Mabul, Malaysia.

Alex Mustard / 2020VISION / Bed of Common mussels (Mytilus edulis) growing on rocks, feeding, Megavissey, Cornwall, UK, May.

Martin Gabriel / European mussel {Mytilus galloprovincialis} shell in sand. Europe.

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

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.