Parent taxon: Cycadopsida according to A. B. Doweld 2001
See also Christenhusz et al. 2011, Iglesias 2016, Knowlton 1919, MacGinitie 1941, Meyen 1984 and Taylor et al. 2008
Sister taxa: Boweniaceae, Crassofilicites, Deltolepis, Dioales, Drepanozamites, Gnetales, Lagenostomales, Manebachia, Marantoidea, Orthogoniopteris, Pteridospermales, Stangeriaceae, Strangerites, Trigonocarpales, Welwitschiales
Subtaxa: Amuriella Anthrophyopsis Apoldia Archaeocycas Aricycas Beaniaceae Behuninia Bucklandia Bureja Cavamonocolpites Crossozamiaceae Ctenozamites Cycadaceae Cycadenia Cycadinorachis Dirhopalostachyaceae Eucommiidites Fascisvarioxylon Gymnovulites Haitingeria Heilungia Mesosingeria Michelilloa Nikania Nilsonia Nilssoniaceae Palaeozamia Paracycas Phasmatocycas Pleiotrichium Sarmatiella Stangerites Sueria Taeniopteris Zamiaceae
Distribution:
• Quaternary of the Bahamas (1 collection)
• Pliocene to Pleistocene of the Congo-Kinshasa (1)
• Miocene of Chile (1), China (1), New Zealand (1), Venezuela (1)
• Oligocene to Miocene of Argentina (1), Australia (1)
• Oligocene of Australia (1), Germany (2), Hungary (1)
• Eocene to Miocene of Argentina (1)
• Eocene of Argentina (3), Australia (23), China (1), Japan (1), United States (3: California, Wyoming)
• Clarkforkian of United States (2: Wyoming)
• Paleocene of Argentina (1), United States (6: Colorado, North Dakota, Wyoming)
• Paleogene of Argentina (1), India (1)
• Cretaceous to Paleogene of New Zealand (1)
• Cretaceous of Antarctica (6), Argentina (9), Australia (8), the Bahamas (6), Belgium (1), Brazil (25), Canada (23: Alberta, British Columbia), China (2), Colombia (10), Ecuador (2), Egypt (59), France (1), Germany (1), Greenland (8), India (11), Israel (9), Japan (2), Kazakhstan (1), Mongolia (1), Morocco (1), Nigeria (5), Pakistan (1), Peru (1), Puerto Rico (1), the Russian Federation (11), South Africa (8), Spain (1), Svalbard and Jan Mayen (1), the United Kingdom (1), United States (35: Alaska, British Columbia, Maryland, North Dakota, Oregon, South Dakota, Virginia, Wyoming)
• Jurassic to Cretaceous of Antarctica (2), Argentina (1), Canada (2: British Columbia, Yukon), Egypt (1), India (3), the Russian Federation (5)
• Jurassic of Afghanistan (4), Antarctica (2), Argentina (4), Australia (5), Azerbaijan (1), Belarus (4), Chile (1), China (103), Colombia (1), Egypt (2), France (19), Georgia (14), Germany (1), Greenland (2), Hong Kong (1), India (50), Iran (4), Italy (1), Japan (9), Kazakhstan (11), Kyrgyzstan (1), Lithuania (1), Mexico (6), Mongolia (1), New Zealand (9), Norway (1), Poland (3), Portugal (1), Romania (37), the Russian Federation (135), South Korea (1), Sri Lanka (1), Switzerland (1), Tajikistan (25), Turkmenistan (1), Ukraine (5), the United Kingdom (52), United States (8: Alaska, Colorado, Montana, Utah, Wyoming), Uzbekistan (11)
• Triassic to Jurassic of Australia (1), Canada (2: Northwest Territories), Georgia (1), Romania (1), Sweden (1), Ukraine (1)
• Triassic of Afghanistan (1), Antarctica (2), Argentina (7), Armenia (1), Australia (10), Austria (2), Chile (8), China (72), France (2), Germany (10), Greenland (8), Hungary (1), India (5), Iran (4), Israel (5), Italy (10), Japan (3), Kazakhstan (2), Kyrgyzstan (2), Lesotho (3), Mexico (17), Mongolia (6), New Zealand (1), Poland (1), the Russian Federation (25), South Africa (33), South Korea (8), Svalbard and Jan Mayen (2), Sweden (4), Switzerland (2), Tajikistan (7), Thailand (1), Ukraine (5), United States (13: Arizona, New Mexico, North Carolina, Utah, Virginia, Virginia/North Carolina), Vietnam (1)
• Permian to Triassic of India (2), South Africa (1)
• Permian of Australia (5), Canada (1: Prince Edward Island), China (103), Czechia (4), France (8), Germany (11), India (19), Indonesia (1), Iraq (1), Italy (1), Japan (3), Madagascar (4), Malaysia (4), Mexico (2), Mongolia (2), Morocco (2), North Korea (5), Papua New Guinea (1), Peru (1), Portugal (1), the Russian Federation (1), Saudi Arabia (2), South Africa (2), South Korea (5), Spain (3), Tanzania (1), Thailand (2), Türkiye (1), the United Kingdom (1), United States (21: Arizona, Kansas, Oklahoma, Texas, Utah), Venezuela (1), Zimbabwe (2)
• Carboniferous to Permian of United States (1: New Mexico)
• Carboniferous of India (1), Portugal (1), Spain (2), United States (6: Arizona, Kansas, Ohio, West Virginia)
• Paleozoic of Chile (1)
Total: 1387 collections including 2720 occurrences