Lagoon Brittle Star

Overview

The Lagoon Brittle Star (Ophiocoma scolopendrina) is a common echinoderm found throughout the Indo-Pacific and Red Sea. It is easily recognized by its central, pentagonal disk and five long, slender arms that allow it to navigate the reef environment.

Distribution & habitat

This species is primarily restricted to intertidal reef platforms, where it thrives in rocky, sandy, and seagrass-rich environments. It is frequently found hiding in crevices or beneath boulders, often in very shallow water near the low-tide mark.

Appearance

Ophiocoma scolopendrina typically features a dark, variegated dorsal side—ranging from black to pale brown—and a lighter, sometimes mottled ventral side. The central disk often displays a distinct, lighter star-shaped or V-shaped pattern. Its five arms are covered in fine spines and are irregularly banded, reaching a total length of up to 15 cm.

Biology & behavior

These brittle stars are generally photophobic, preferring to remain sheltered during the day. They are known for their ability to regenerate lost arms, a vital physiological trait. Unlike many of its relatives, this species exhibits a unique surface-film feeding behavior, using its arms to sweep the water surface to trap organic particles. They are also capable of reproducing throughout the year via broadcast spawning.