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; phylum Cnidaria, class Anthozoa)

A subclass of sedentary, colonial corals with polyps that always have eight tentacles which are almost invariably pinnate. There are eight complete, unpaired mesenteries and septa, and a ventral groove on the stomodaeum. Skeletal structures are usually made from calcareous spicules.

Subjects: Earth Sciences and Geography — Zoology and Animal Sciences.

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