Parent taxon: Gymnospermophyta according to Cleal 1994
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, Paradoxoxylon, Tungussocarpus, Dinophyton, Embergerixylon, Decussosporites, Alisporites, Cedripites, Squamae, Eddya, Indusiisporites, Shanbeipollenites, Pteridospermaexylon, Lasiostrobus, Striomonosaccites, Lobatoxylon, Prototaxodioxylon, Falcisporites, Ktalenia, Solenoxylon, Yezonia, Menaispermae, Taeniopitys, Parataxopitys, Rugubivesiculites, Taxacites, Reticulopitys, Cycadinoxylon, Sofrepites, Protopolyporoxylon, Perinopollenites, Ashmoripollis, Galeacornea, Gnetaceaepollenites, Scotoxylon, Majsassia, Amdrupia, Zonallapollenites, Svalbardoxylon, Enzonalasporites, Minutosaccus, Protocircoporoxylon, Cerebropollenites, Darneya, Pilasporites, Accintisporites, Tordoxylon, Pteridospermopsida, Trisocladus, Antarcticoxylon, Yorkoxylon, Protopitys, Exesipollenites
Subtaxa: Elkinsiales
Ecology: "photoautotroph"
Distribution:
• Devonian of Belgium (1 collection), United States (1: West Virginia)
Total: 2 collections each including a single occurrence