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

Doc White / Humpback whale (Megaptera novaeangliae) with two kinds of barnacles, the long Gooseneck barnacle (Conchoderma aurtium) which lives on the Acorn barnacle (Coronula diadema) also whale lice, (Cyamus boo...

Philippe Clement / Collection of shells: Common Mussel (Mytilus edulis), Baltic tellin shell (Macoma balthica), Rayed trough shell (Mactra stultorum cinerea / Mactra corallina cinerea), Netted dog whelk (Nassarius retic...

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

Joel Sartore / Photo Ark / Encrusting sand tube worm (Sabellaria sp.) and Ivory barnacles (Balanus eburneus) on the shell of a American / Common oyster (Crassostrea virginica), Gulf Specimen Marine Lab and Aquarium.

Joel Sartore / Photo Ark / Two Hooked mussels (Ischadium recurvum), one with an Ivory barnacle (Balanus eburneus) attached to shell, Gulf Specimen Marine Lab and Aquarium.

Joel Sartore / Photo Ark / Cord grass barnacle (Chthamalus fragilis) on white background, Gulf Specimen Marine Lab and Aquarium.

Martin Camm / Carwardine / Acorn barnacle (Cryptolepas rhachianecti) - found in large numbers on most grey whales No more than 15 illustrations by Martin Camm, Rebecca Robinson and/or Toni Llobet to be used in a single p...

Martin Camm / Carwardine / Rabbit-ear barnacle (Conchoderma auritum) attached to an acorn barnacle on a humpback whale's flipper No more than 15 illustrations by Martin Camm, Rebecca Robinson and/or Toni Llobet to be use...