Alcyonaria
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 Iciligorgia schrammi
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Alcyonaria (also known as Octocorallia, as they have 8-fold symmetry) is a subclass of the class Anthozoa within the phylum Cnidaria. It includes the sea fans and sea pens, and the soft corals of the order Alcyonacea.
The subclass is divided into a number of orders; those which are extinct are marked with †.
- Alcyonacea (soft corals)
- Gorgonacea (sea fans, sea feathers)
- Helioporacea
- Pennatulacea (sea pens, sea pansies)
- Stolonifera
- Telestacea
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