Organisms that comprised reef complexes remained virtually unchanged during the Paleozoic.

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Organisms that comprised reef complexes during the Paleozoic did undergo significant changes over time. For example, stromatoporoids, rugose and tabulate corals, and brachiopods dominated reef-building communities during different periods of the Paleozoic, but their abundance and diversity changed as a result of environmental and ecological factors. Additionally, new organisms, such as crinoids and bryozoans, evolved and became important reef-builders during the Paleozoic.

Organisms That Comprised Reef Complexes Remained Virtually Unchanged During the Paleozoic