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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