Common brittlestar  (Ophiothrix fragilis)

Like all brittlestars, the common brittlestar has five long, slender arms, which radiate out from a central disc. The mouth is located in the centre of the underside of the disc, and there is no anus (3). This brittlestar varies greatly in colour, and may be red, brown, white or banded. The arms are covered in serrated spines (3), and are very fragile (2). The disc also bears spines and is roughly pentagonal in shape (4).