Shallow Water Corals Evolved From Deep Sea Ancestors

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New research shows that the second most diverse group of hard corals first evolved in the deep sea, and not in shallow waters. Stylasterids, or lace corals, diversified in deep waters before launching at least three successful invasions of shallow water tropical habitats in the past 40 million years. This finding provides the first strong evidence that a group of deep-sea animals invaded and diversified in shallow waters.

More... (http://www.sciencedaily.com/releases/2008/06/080617204512.htm)