Parent taxon: Embryophyta according to E. Taylor et al. 2008
See also Doweld 2001
Sister taxa: Acylomurus, Antherocerotophyta, Anthocerotophyta, Concavissimisporites, Coniferophyta, Divisisporites, Gigantopteridales, Ginkgophyta, Hermanophytales, Iraniales, Lusatisporis, Lycophyta, Progymnospermophyta, Pteridospermophyta, Sphenophyta, Zosterophyllophyta
Subtaxa: Acozamites Aldania Almargemia Amphibennetites Androlepis Antherangiopsis Bennettitacearum Bernettia Bjuvia Blastolepis Bolbopodium Bucklandiopsis Campylophyllum Clathropodium Cloughtonia Colymbetes Crossozamia Ctenidium Ctenopteris Cycadangium Cycadea Cycadeacites Cycadeocarpus Cycadeomyelon Cycadeorachis Cycadeostrobus Cycadinocarpus Cycadites Cycadocaulum Cycadocephalus Cycadofilix Cycadophycos Cycadophyllum Cycadopites Cycadopsida Cycadopsis Cycadopteris Cycadorachis Cycadoxylon Cyclozamia Cylindropodium Dioonitocarpidium Doratophyllum Encephalartites Endogenites Eurycycadolepis Fittonia Guilliera Harringtonia Hisingera Jacutiella Jensensispermum Jirusia Laconiella Lepidanthium Leptopterophyllum Lunzia Macropterygium Macrotaeniopteris Macrotorellia Megalozamia Morrisia Navajoia Novoguineoxylon Ontheodendron Pachytestopsida Palaeocycas Phasmatocycadopsida Plagiozamiopsis Plagiozamites Platylepis Polypodiolites Pramelreuthia Pseudopterophyllum Pseudoptilophyllum Pteronilssonia Pterozamites Ptychoxylon Quervainia Russellites Schizopodium Sedgwickia Sewardia Sinoctenis Taeniophyllum Taeniopteridium Tessellaria Westersheimia Yatesia Zamiophyllum