Brittle star / Ophioarachna incrassata / Family Ophiodermatidae
Brittle stars (ophiurians) have longer arms than sea stars. The arms are flexible and used for swimming. Brittle stars do not rely on tube feet for movement and are the fastest moving of the echinoderms.
Brittle stars have long snake-like feathery arms that radiate out from a small central disc. The arms are used to help the animal move.
Brittle stars are often found living under rocks during the day. When disturbed, they move quickly away using their arms in a rapid snake-like motion.
Small species feed on drifting plankton by raising their arms into the water above them. Some large specimens have been known to feed on fish that they have caught while the fish were sleeping.
As far as we know, Brittle stars are not endangered, but like most creatures on the Great Barrier Reef, they are affected by water quality and sea temperature. Pollution and rising sea temperatures could endanger Brittle stars.