Rock Barnacle
Chthamalus montagui
Rock Barnacles occupy slightly higher zones on the shore than acorn barnacles, tolerating stronger waves and longer periods out of the water. From above, each barnacle has a more angular opening and clamps shut to retain moisture when exposed. On Lihou’s rocky ledges, you might find them in the splash zone above acorn barnacle bands, enduring wave action day after day.
- Habitat: High to mid-intertidal rocks, often in more exposed coastal areas.
- When to See: Year-round
- Length: Slightly smaller than many Acorn Barnacles, typically under 1 cm diameter