Phylum Equisetophyta Scott 1900
Parent taxon: Pteridophytanae according to A. B. Doweld 2001
Sister taxa: Botryopteridiophyta, Cladoxylophyta, Marattiophyta, Ophioglossophyta, Sphenophyllophyta
Subtaxa: Asterocalamitopsida Calamitopsida Equisetopsida Parasphenophyllum Paratrizygia