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DescriptionOphiopsila annulosa displays the characteristic brittle star body plan with a flat central disc and five distinctly demarcated thin arms. As a member of the order Ophiurida, its arms are usually moved horizontally and the discs and arms are covered with scales. The circular disc can reach 22 mm in diameter, while the arms reach up to 13 cm in length. It has both tooth and mouth papillae, a smooth dorsal disc area and notably wiry arms. It has about twelve arm spines per segment. The disc is mottled reddish brown and white in colour. The arms are very distinctly banded brown and white.It can be differentiated from Ophiopsila aranea by having about twelve arm spines and by being more robust.