alcyonacea การใช้

Soft corals, order Alcyonacea, have eight primary mesenteries which alternate with the eight tentacles.
Octocorallia comprises the sea pens ( Pennatulacea ), soft corals ( Alcyonacea ), and blue coral ( Helioporacea ).
Sea whips and sea fans, known as gorgonians, are part of Alcyonacea and historically were divided into separate orders.
The current phylogeny is shown below, where Calcaxonia and Holaxonia are groups of gorgonians and the four remaining divisions of Alcyonacea are merely distinguished for convenience.
In reef areas of low densities of hard coral, reflecting the nature of the reef community or due to feeding by high density crown-of-thorns, the starfish may be found feeding on soft corals ( Alcyonacea ).