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An illustration of calcarina spengleri.

Calcarina Spengleri

An illustration of calcarina spengleri.

A living coral, a marine organism in the class Anthozoa.

Coral

A living coral, a marine organism in the class Anthozoa.

Corals are marine organisms from the class Anthozoa and exist as small sea anemone-like polyps, typically in colonies of many identical individuals. The group includes the important reef builders that are found in tropical oceans, which secrete calcium carbonate to form a hard skeleton.

Coral

Corals are marine organisms from the class Anthozoa and exist as small sea anemone-like polyps, typically…

Corals are marine organisms from the class Anthozoa and exist as small sea anemone–like polyps, typically in colonies of many identical individuals. The group includes the important reef builders that are found in tropical oceans, which secrete calcium carbonate to form a hard skeleton.

Coral

Corals are marine organisms from the class Anthozoa and exist as small sea anemone–like polyps,…

A fossilized coral.

Coral Fossil

A fossilized coral.