Scleractinia, also called stony corals, are marine corals that generate a hard skeleton. They first appeared in the Middle Triassic and descended from the tabulate and rugose corals that barely survived the end of the Permian. Much of the framework of modern coral reefs is formed by scleractinians. Stony corals numbers are expected to decline due ...
Found on
http://en.wikipedia.org/wiki/Scleractinia
Order of coelenterates, usually producing calcareous skeletons with hexameral symmetry
Found on
https://www.encyclo.co.uk/local/20125
No exact match found.
