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

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...

Paul Williams / Ochre starfish (Pisaster ochraceus), Goose barnacles (Pollicipes polymerus) and California mussel (Mytilus californianus) in rock pool, Vancouver Island, British Columbia, Canada, July.

Paul Williams / Goose barnacles (Pollicipes polymerus) and California mussel (Mytilus californianus), Vancouver Island, British Columbia, Canada, June.

Paul Williams / Goose barnacles (Pollicipes polymerus) and California mussel (Mytilus californianus), Vancouver Island, British Columbia, Canada, June.

Paul Williams / Ochre starfish (Pisaster ochraceus) California mussel (Mytilus californianus) and Giant green anenome (Anthopleura xanthogrammica) in rock pool, Vancouver Island, British Columbia, Canada. July.

Sebastian Kennerknecht / California Mussel (Mytilus californianus) clusters, Barnacles (Balanus sp), Black Turban Snails (Tegula funebralis), Rockweed (Fucus sp), and Sea Lettuce (Ulva sp) in high tide zone, Santa Cruz, Monte...

GEORGETTE DOUWMA / California mussel {Mytilus californianus} exposed during low tide, Tongue Point, Washington, USA.

GEORGETTE DOUWMA / California mussel {Mytilus californianus} exposed during low tide, Tongue Point, Washington, USA.

Jaymi Heimbuch / Leaf Barnacle (Pollicipes polymerus) group on California Mussels (Mytilus californianus), Lincoln City, Oregon

Jaymi Heimbuch / California Mussel (Mytilus californianus) being harvested, Lincoln City, Oregon