Synonym: Medullosales [replaced name]
Parent taxon: Cycadopsida according to S. V. Meyen 1984
See also Taylor et al. 2008
Sister taxa: Boweniaceae, Crassofilicites, Cycadales, Deltolepis, Dioales, Drepanozamites, Lagenostomales, Manebachia, Marantoidea, Orthogoniopteris, Pteridospermales, Stangeriaceae, Strangerites, Welwitschiales
Subtaxa: Alethopteridaceae Angiospermophyton Neuropteridae Sarcospermum Trigonocarpaceae Trigonocarpolithus
Ecology: "photoautotroph"
Distribution:
• Jurassic of India (1 collection), Italy (1)
• Triassic of Germany (1), Hungary (1), India (1), United States (1: North Carolina)
• Permian of Canada (1: Nunavut), China (59), Czechia (1), France (4), Germany (6), Italy (1), Mexico (1), Mongolia (2), Morocco (2), Portugal (1), the Russian Federation (21), Saudi Arabia (1), Spain (1), Türkiye (1), United States (6: Arizona, Colorado, Kansas, Texas)
• Namurian of Türkiye (2)
• Carboniferous to Permian of Spain (1)
• Carboniferous of Brazil (1), Canada (9: New Brunswick, Nova Scotia), France (1), Germany (2), Peru (1), Portugal (3), Spain (10), Ukraine (1), United States (50: Alabama, Alaska, Arizona, Colorado, Georgia, Illinois, Indiana, Kansas, Missouri, New Mexico, Ohio, Oklahoma, Pennsylvania, Utah, West Virginia)
• Devonian of Canada (1: Quebec)
Total: 196 collections including 288 occurrences