Zoantharia

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Zoantharia (Hexacorallia; phylum Cnidaria, class Anthozoa) A subclass of solitary and colonial anthozoans, with or without a calcareous exoskeleton, that are characterized by paired mesenteries being first developed in a cycle of six; and by the insertion of new pairs in two (ventrolateral), four (lateral and ventrolateral), or all six primary exocoels. Zoantharia first appeared in the Ordovician.

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