Astraea or star-coral is a colonial coral with closely-placed polygonal cups bearing polyps. The thecae are so close together as to have common walls.The colony is compact and massive and produced by budding,the buds growing more or less parallel with one another.The coenchyme is formed by calcifications of the coenosarc and gives origin to individual corallites. The polyps in cups are elevated rounded widely separated and spirally arranged.
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