†class Calamitopsida Endlicher 1841
Parent taxon: Equisetophyta according to A. B. Doweld 2001
Sister taxa: Asterocalamitopsida, Equisetopsida, Parasphenophyllum, Paratrizygia
Subtaxa: Calamitales Calamocarpales
Parent taxon: Equisetophyta according to A. B. Doweld 2001
Sister taxa: Asterocalamitopsida, Equisetopsida, Parasphenophyllum, Paratrizygia
Subtaxa: Calamitales Calamocarpales