Parent taxon: Gymnospermophyta according to G. J. Retallack 1981
See also Lapasha and Miller 1985
Sister taxa: Aethophyllum, Alatocarpus, Allicospermum, Araucariales, Arberiella, Archaeosperma, Barakaroxylon, Belemnopteris, Bennettitales, Birsinghpuria, Bulbospermum, Cardiocarpum, Carpodium, Collospermum, Coniferae, Coniferales, Cordaitopsida, Cornucarpus, Cupressoconus, Damudoxylon, Entylissa, Gondwanophyllites, Indoxylon, Kamthioxylon, Kaokoxylon, Kryshtofovichiella, Lyginopteridopsida, Maheshwariella, Megaporoxylon, Nandorioxylon, Nidispermum, Niponophyllum, Nummulospermum, Otofeistia, Pakuriospermum, Palaeocarpus, Palispermum, Pantiaspermum, Paradoxospermum, Parapalaeoxylon, Platycardia, Polyloboxylon, Polysolenoxylon, Prototaxopitys, Prototaxoxylon, Pyriformispermum, Retortistoma, Rotundaspermum, Savitrispermum, Scirroma, Sclerospiroxylon, Sertostrobus, Shivacarpus, Sonajorispermum, Stephanostoma, Stereocarpus, Sujfunophyllum, Surangephyllum, Tanaidia, Tanaidocarpidium, Taxaliospermum, Taxineae, Taxopitys, Triangulospermum, Trigonomyelon, Uesuguipollenites, Voltziostrobus, Zalesskioxylon, Parcisporites, Sofrepites, Taeniopitys, Solenoxylon, Ktalenia, Lagenospermopsida, Paradoxoxylon, Enzonalasporites, Scotoxylon, Tungussocarpus, Eddya, Protopitys, Falcisporites, Cycadinoxylon, Lobatoxylon, Svalbardoxylon, Indusiisporites, Antarcticoxylon, Protopolyporoxylon, Exesipollenites, Decussosporites, Striomonosaccites, Prototaxodioxylon, Accintisporites, Yorkoxylon, Darneya, Squamae, Parataxopitys, Yezonia, Cedripites, Gnetaceaepollenites, Shanbeipollenites, Alisporites, Amdrupia, Rugubivesiculites, Majsassia, Perinopollenites, Tordoxylon, Pilasporites, Dinophyton, Embergerixylon, Cerebropollenites, Protocircoporoxylon, Zonallapollenites, Trisocladus, Minutosaccus, Reticulopitys, Pteridospermaexylon, Taxacites, Lasiostrobus, Menaispermae, Galeacornea, Ashmoripollis
Subtaxa: none
Ecology: "photoautotroph"
Distribution: