Octocorallia (Alcyonaria; 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.
Octocorallia (octocorals) A subclass of the class Anthozoa, poorly known in the fossil record, that ranges from Ordovician to Recent. The colony is shaped like a flat fan of interconnecting branches from which project tubes with many zooids. Heliopora is an important reef former. The pennatulaceans (Pennatulacea) are also octocorals.
octocorals See OCTOCORALLIA.
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