Parent taxon: Gymnospermae according to Z. Wang et al. 2018
See also Doweld 2001
Sister taxa: Condylites, Masculostrobus, Palaeocyparis, Pinopsida, Podocarpopsida, Satyrites incertus, Taxopsida, Voltziopsida, Gondwanophyllites, Kryshtofovichiella, Platycardia, Polyloboxylon, Retortistoma, Arberiella, Megaporoxylon, Barakaroxylon, Polysolenoxylon, Rotundaspermum, Nidispermum, Cardiocarpum, Sujfunophyllum, Stereocarpus, Prototaxoxylon, Araucariales, Triangulospermum, Niponophyllum, Maheshwariella, Otofeistia, Paradoxospermum, Damudoxylon, Entylissa, Kamthioxylon, Prototaxopitys, Bulbospermum, Sclerospiroxylon, Palispermum, Taxineae, Sonajorispermum, Birsinghpuria, Palaeocarpus, Pantiaspermum, Nandorioxylon, Cornucarpus, Nummulospermum, Shivacarpus, Bennettitales, Zalesskioxylon, Voltziostrobus, Alatocarpus, Belemnopteris, Tanaidocarpidium, Savitrispermum, Coniferales, Pyriformispermum, Kaokoxylon, Uesuguipollenites, Sertostrobus, Carpodium, Indoxylon, Taxaliospermum, Aethophyllum, Archaeosperma, Parapalaeoxylon, Scirroma, Surangephyllum, Trigonomyelon, Stephanostoma, Cupressoconus, Taxopitys, Pakuriospermum, Tanaidia, Collospermum, Coniferoovulites
Subtaxa: Cordaitaceae
Distribution:
• Triassic of Argentina (3 collections), Chile (1), France (1), India (2), Mexico (3), the Russian Federation (3)
• Permian to Triassic of South Africa (2)
• Permian of Antarctica (5), Australia (18), Botswana (1), Brazil (16), Canada (2: Prince Edward Island), Chile (1), China (33), the Congo-Kinshasa (4), India (11), Madagascar (4), Mongolia (4), Niger (1), the Russian Federation (58), South Africa (6), Tanzania (1), Uganda (1), United States (1: Texas), Zambia (2), Zimbabwe (1)
• Carboniferous to Permian of the Russian Federation (1)
• Carboniferous of Argentina (1), Canada (2: New Brunswick, Nova Scotia), the Russian Federation (4), Ukraine (1), United States (14: Alabama, Colorado, Illinois, Indiana, Kansas, Missouri, New Mexico, Ohio, Utah, West Virginia)
• Devonian of Canada (1: Quebec)
Total: 209 collections including 365 occurrences