The Common starfish, or common sea star, (Asterias rubens), is the most common and familiar Asteroidea|starfish in the north-east Atlantic. It has five arms and usually grows to between 10–30 cm across, although larger specimens (up to 52 cm across) are known. The common starfish is usually orange or brown, and sometimes violet; deep-water specimens are pale. The Common Starfish is to be found on rocky and gravelly substrates. Elephantfish