Asterina phylactica
Encyclopedia
Asterina phylactica is a species of sea star
Sea star
Starfish or sea stars are echinoderms belonging to the class Asteroidea. The names "starfish" and "sea star" essentially refer to members of the class Asteroidea...

. It can be found in geographically widespread sites around the British Isles and in the Medieterranean and Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

. It has five arms, is about 1.5 cm across and is of green colour. The species was formally identified in 1979 and is very similar to Asterina gibbosa.
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