Yellow Cluster Anemone

Overview

The Yellow Cluster Anemone is a colonial cnidarian known for its vibrant yellow to orange coloration. Unlike solitary sea anemones, these polyps are interconnected by a common tissue base called coenenchyme, often forming dense, flower-like mats on rocky surfaces.

Distribution & habitat

This species is found in the temperate eastern Atlantic Ocean, ranging from the British Isles down to the Canary Islands, as well as throughout the Mediterranean Sea, the English Channel, and the North Sea. It prefers rocky substrates and is frequently observed on vertical walls, under overhangs, and at the entrance of caves where currents are present to provide food.

Appearance

Each individual polyp features a retractable column and a crown of 24 to 36 slender, tapering tentacles arranged in two cycles. The column is often encrusted with sand grains or sponge spicules for structural support. Colonies can vary in size, sometimes covering several square meters, and may be found growing directly on sponges, particularly those of the genus Axinella.

Biology & behavior

These anemones are sessile, colonial organisms that reproduce through both sexual means and asexual fission, where colonies divide to spread across the substrate. They are known to be sciaphilous, meaning they prefer shaded environments and generally avoid areas prone to heavy sedimentation. Growth is typically moderate, with colonies occasionally undergoing fusion or fission to adapt to their environment.

Feeding

As microphagous predators, they rely on water currents to deliver microscopic zooplankton. They capture these prey items using specialized stinging cells called cnidocytes located on their tentacles.