Patella vulgata reaches 6 cm. Dominant limpet of NE Atlantic coasts, from Norway to Portugal, cousin of the Mediterranean P. caerulea (in base). Conical grey-beige shell with subtle radial ribs, white inside. Lives clamped to rocks in the intertidal zone. Nocturnal herbivore: emerges at high tide to graze microalgae, returns to its exact home scar (homing) as the tide falls. Iconic on Brittany and British coasts.
