CORALS –(zoantharia) are chidarians that have discarded the free swimming stage
and live as attached polyps, either singly or in colonies.
They are common fossils due to their mineralised, often elaborate skeletons, which
generally resemble a curp surrounding the anemone-like creature.
Coral reefs have occurred fro much of the last 500 million years and are useful indicators or
markers for dating rocks.
The turbulent and rugose (“wrinkly”) corals did not survive the major end of Permian
mass extinction event.
All post-triassic corals, including living types, are known as scleractinians. They
superficially resemble rugose corals but they can be distinguished by their
internal ribs or septa, which are always arranged in multiples of six.
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