†phylum Sphenophyta
Parent taxon: Embryophyta according to E. Taylor et al. 2008
Sister taxa: Acylomurus, Antherocerotophyta, Anthocerotophyta, Concavissimisporites, Coniferophyta, Cycadophyta, Divisisporites, Gigantopteridales, Ginkgophyta, Hermanophytales, Iraniales, Lusatisporis, Lycophyta, Progymnospermophyta, Pteridospermophyta, Zosterophyllophyta
Subtaxa: Apocalamitaceae Equisetinae Neocalamostachys Sphenopsida