Cycadopsida - Cycadales - Cycadaceae
Parent taxon: Cycadales according to A. B. Doweld 2001
See also Christenhusz et al. 2011, Knowlton 1919, Mabberley 2000, MacGinitie 1941 and Meyen 1984
Sister taxa: Amuriella, Anthrophyopsis, Apoldia, Archaeocycas, Aricycas, Beaniaceae, Behuninia, Bucklandia, Bureja, Cavamonocolpites, Crossozamiaceae, Ctenozamites, Cycadenia, Cycadinorachis, Dirhopalostachyaceae, Eucommiidites, Fascisvarioxylon, Gymnovulites, Haitingeria, Heilungia, Mesosingeria, Michelilloa, Nikania, Nilsonia, Nilssoniaceae, Palaeozamia, Paracycas, Phasmatocycas, Pleiotrichium, Sarmatiella, Stangerites, Sueria, Taeniopteris, Zamiaceae
Subtaxa: Beaniopsis Ctenophyllum Ctenopsis Cycadinocarpus Cycadites Cycadospadix Cycas Dichotozamites Dioonites Encephalartopsis Encephalartos Glossozamites Leprospermum Leptocycas Menucoa Microzamia Platypterygium Sphenozamites Zamiopsis Zamiostrobus
Type: Cycas
Distribution:
• Quaternary of the Bahamas (1 collection)
• Pliocene to Pleistocene of the Congo-Kinshasa (1)
• Miocene of China (1)
• Eocene of China (1), Japan (1), United States (1: Wyoming)
• Clarkforkian of United States (1: Wyoming)
• Paleogene of Argentina (1)
• Cretaceous of Ecuador (2), Greenland (7), India (1), Spain (1), United States (3: South Dakota, Virginia)
• Jurassic to Cretaceous of India (1)
• Jurassic of France (3), India (5), Italy (1), Kazakhstan (3), Mexico (1), the Russian Federation (3), Tajikistan (1), the United Kingdom (3), United States (2: Alaska, Wyoming)
• Triassic of Austria (1), China (10), Germany (2), Italy (3), Mexico (11), Poland (1), the Russian Federation (4), Ukraine (1), United States (9: North Carolina, Virginia, Virginia/North Carolina)
• Permian of China (1), India (2), South Korea (1), United States (2: Kansas, Texas)
Total: 93 collections including 105 occurrences