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Alcyonacea are a species of sessile colonial cnidarians that are found throughout the oceans of the world, especially in the deep sea, polar waters, tropics and subtropics.

Ricordea mushroom corals are one of the fastest growing corals in the world.

Rugose corals were either solitary, having a single large coral polyp, or colonial, with multiple polyps sharing a common skeletal framework.

This coral fauna includes Red Sea endemics (23 spp.

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