Six-plated Barnacle

Scientific Name: Chthamalus antennatus

Description: Barnacles are crustaceans that begin life as part of the plankton before they settle onto rocks or other surfaces and their shells become permanently attached.

The shell of the barnacle has two valves which can open and allow their hairy legs, known as cirri, to be extended when covered by water to capture food, then close to prevent desiccation when the tide is out.

This barnacle has six plates and numerous grooves towards the bottom of the outer surface, and is found in large numbers on the upper parts of the rock platform.

Type: Crustaceans (Barnacles)
Where to find: Intertidal Reefs
Size: 12mm