Calcaxonia

Calcaxonia (1981 - 1999 known only under the informal name restricted Holaxonia) was, in some systems, an Octocorallian suborder of the order Gorgonacea, or alternatively of the broadly conceived order Alcyonacea. Before its formal erection in 1999, it was usually included inside the suborder Holaxonia.

According to a 2022 revision of Octocorallia, former Calcaxonia is part of the newly created order Scleralcyonacea, with the exception of the Calcaxonian genus Isis which is included in the order Malacalcyonacea. Within Scleralcyonacea, almost all former Calcaxonia taxa form together one unnamed clade, only Ellisellidae and Dendrobrachiidae (and possibly also Chelidonisididae) are parts of other clades of Scleralcyonacea.