Subclass Equisetidae Warm 1883 (fern)
Polypodiopsida - Equisetidae - Equisetidae
Synonym: Arthrophyta
Parent taxon: Polypodiopsida according to PPG. I 2016
See also Chandra and Tewari 1991
Sister taxa: Acrocarpus, Biretisporites, Blechnaceae, Cladophlebis, Dicksoniaceae, Gleicheniaceae, Marattiidae, Marsileaceae, Osmundaceae, Polypodiaceae, Polypodiidae, Protopteris, Pseudosalvinia, Pterygopteris, Punctatosporites, Schizopteris, Tempskyaceae, Verrucosisporites
Subtaxa: Equisetales Trizygia