Meer, Meerestier, Meerestiere, Niedere Tiere, Wirbellose, Invertebrata, Invertebrate, Invertebrates, Korallenriff, coral reef, Cnidaria, Hohltiere, Hohltier, Koralle, Korallen, coralExif ImageDescription:
Scleractinia, also called Stony corals, are exclusively marine animals; they are very similar to sea anemones but generate a hard skeleton. They first appeared in the Middle Triassic and replaced tabulate and rugose corals that went extinct at the end of the Permian. Much of the framework of coral reefs is formed by scleractinians.
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