Madreporaria (Scleractinia; stony corals; class Anthozoa, subclass Zoantharia)
An order of colonial (or, more rarely, solitary) corals, which always possess an external ectodermal, calcareous skeleton consisting essentially of radial septa
. Septa develop following the pattern of mesenteries
in cycles of 6, 12, 24, 48, etc. The order first appeared in the Middle Triassic
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