A large brittlestar with twisted arms that are conspicuously banded. The disc is pentagonal and covered with regular rounded plates. The arms are thick and segmented, with 6-7 short thick spines encircling each segment with one small spine being transformed into a hook. The dorsal surface of the arms has a single series of oval plates along its midline each surrounded by a ring of smaller plates. The colour is mainly red but often variegated and, more rarely, the disc may be bluish. The disc is approximately 15 mm across and the arms are 4x disc diameter in length.This species avoids light and prefers to hide beneath rocks, under shells or among seaweed. By virtue of their long flexible arms this species is well adapted for attaching itself to other animals.