1>It is commonly called as sea-pentagon.
2>The central disc is large and the five arms are short and tapering.
3>The aboral surface bears immovable tubercles,a madreporite and anus.
4>The oral surface is concave,having a central mouth.
5>The upper marginal plates are smaller than the ventral ones .
2>The central disc is large and the five arms are short and tapering.
3>The aboral surface bears immovable tubercles,a madreporite and anus.
4>The oral surface is concave,having a central mouth.
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