The following
taxa were included in Calcaxonia: • family
Chelidonisididae (before 2021, this taxon was classified either as part of Isididae or as incertae sedis) • family
Chrysogorgiidae • family
Dendrobrachiidae (before 2019, this taxon was classified as part of Holaxonia, rather than Calcaxonia) • family
Ellisellidae • family
Ifalukellidae • genus
Isis (the current family
Isididae includes only this genus plus two genera formerly included in
Gorgoniidae being part of
Holaxonia; prior to 2021/2016, the family Isididae included this genus plus what are now the families Keratoisididae, Mopseidae and Chelidonisididae) • family
Isidoidae (before 2021, this taxon was classified either as incertae sedis or as part of Chrysogorgiidae) • family
Keratoisididae (before 2021/2016, this taxon was classified as part of Isididae) • family
Mopseidae (before 2021/2016, this taxon was classified as part of Isididae; since 2021, Mopseidae includes the family
Circinisididae proposed in 2016) • family
Pleurogorgiidae (before 2021, this taxon was classified as part of Chrysogorgiidae) • family
Primnoidae Note that while some of the above families were (re)created by various studies in 2021, all the above families were moved to the new order Scleralcyonacea one year later, i.e. in 2022. == Calcaxonia sensu lato ==