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Asterina phylactica
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Asterina phylactica : ウィキペディア英語版
Asterina phylactica

''Asterina phylactica'' is a species of sea star. It can be found in geographically widespread sites around the British Isles and in the Mediterranean Sea. It has five arms, is about 1.5 cm across and is of a green colour with central brown markings.〔(''Asterina phylactica'' ), habitas.org.uk, accessed 31 August 2008〕 The species was formally described in 1979 and is very similar to ''Asterina gibbosa''.
==Description==
''Asterina phylactica'' is a pentagonal starfish with short blunt arms and a flattened shape. It grows to a diameter of about and is olive-green with a central brown star-shaped marking, a pale underside, and a clear cut edge between the upper and lower surfaces. It can be distinguished from the closely related ''Asterina gibbosa'' by the fact that it has fewer plates surrounding its mouth, its smaller size and its characteristic colouring. At one time the two were believed to be the same species but it was realised in 1979 that besides the differences in appearance, the two occupied different ecological niches and had different reproductive methods.

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