The modern hexacorals that build reefs in the world's oceans experienced their first adaptive radiation during

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The first adaptive radiation of modern hexacorals that built reefs occurred during the Late Triassic, around 240 million years ago. This led to a diversification of skeletal forms and the evolution of symbiotic relationships with algae, which allowed for the formation of coral reefs.

The Modern Hexacorals That Build Reefs in the World's Oceans