As its name suggests, the blue starfish has a uniformly intense blue body that can vary from pale to dark. In fact, it's the only blue starfish ! In the juvenile stage, the color turns blue-green.

Its arms, five in number, are cylindrical in shape and have a rounded end.

The blue starfish is a starfish whose adult size can reach 20 to 30 centimeters in diameter.

The blue starfish is mainly found in the Indo-Pacific regions and along the Australian coasts.

The blue starfish is found in the sunny areas of coral reefs. Preferring hard substrates, it is rare to observe it on sandy areas except when it moves to reach another area of the reef.

The blue starfish is a detritivore, feeding on detritus and organic debris of all kinds.

The blue starfish is a nocturnal creature that moves randomly every night in search of its food.

Like most starfish, the blue starfish reproduces sexually, with the females, standing on their arms and with rounded backs, releasing an impressive number of gametes into the sea water.

At the same time, the males do the same, expelling their sperm in equally impressive numbers. Fertilization then takes place in open water ! The fertilized eggs divide and transform into planktonic larvae that drift in the ocean currents.

After a few days, the larva finally settles and begins its metamorphosis into a young starfish. In the juvenile stage, the blue starfish lives hidden in rocky crevices and stones.

The blue starfish also reproduces asexually by splitting off one or more of its arms, giving rise to a new individual.