Madreporaria
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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Graptolithina
Graptolithina (graptolites; phylum Hemichordata) A class of extinct, colonial, marine organisms which secreted a c…
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Madreporaria
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Madreporaria