Class Equisetopsida Agardh 1825
Synonym: Equisetophyceae [replaced name]
Parent taxon: Equisetophyta according to A. B. Doweld 2001
See also Kenrick and Crane 1997 and Mabberley 2000
Sister taxa: Asterocalamitopsida, Calamitopsida, Parasphenophyllum, Paratrizygia
Subtaxa: Anthocerotidae Bryidae Chlamidostachys Echinostachyales Gondwanostachyales Paraphyllanthoxylon Pinidae Sphenophyllales