Atlantic Beadlet Anemone

Overview

The Atlantic Beadlet Anemone is a resilient and common inhabitant of rocky shores, widely distributed across the North Atlantic, Mediterranean, and along the coast of Africa. These solitary polyps are highly adapted to the intertidal zone, where they can survive both complete submersion and extended periods of exposure to air during low tide.

Distribution & habitat

This species is typically found attached to hard substrates like rocks and stones in both exposed and sheltered coastal areas. While most common in the intertidal zone, it can also be found in subtidal regions and occasionally in variable salinity environments such as estuaries.

Appearance

When submerged, the anemone displays a smooth, often rust-red column—though colors can range from green to brown or orange—topped with up to 192 retractable tentacles. A key identifying feature is a ring of bright blue, wart-like spots known as acrorhagi located just below the tentacles. When exposed to air, the animal retracts its tentacles and contracts into a jelly-like, dome-shaped blob to prevent desiccation.

Biology & behavior

Beadlet anemones are known for their territorial nature and will use their stinging acrorhagi to deter or attack neighboring individuals that come into contact with them. They exhibit consistent individual behavioral traits, such as varying levels of boldness when investigating their surroundings. To defend against predators or harsh conditions, they can quickly detach from the substrate or retract their tentacles.

Feeding

As a predator, it uses its tentacles, which are equipped with stinging cells called nematocysts, to paralyze small aquatic animals, including crustaceans and small fish, before consuming them.