Parent taxon: Gymnospermae according to C. B. Ettinghausen 1880
Sister taxa: Condylites, Masculostrobus, Palaeocyparis, Pinopsida, Podocarpopsida, Satyrites incertus, Taxopsida, Voltziopsida, Sertostrobus, Pyriformispermum, Trigonomyelon, Nummulospermum, Triangulospermum, Stereocarpus, Bennettitales, Parapalaeoxylon, Scirroma, Retortistoma, Stephanostoma, Pakuriospermum, Bulbospermum, Coniferae, Savitrispermum, Polyloboxylon, Aethophyllum, Zalesskioxylon, Sclerospiroxylon, Platycardia, Indoxylon, Kamthioxylon, Shivacarpus, Entylissa, Niponophyllum, Prototaxopitys, Uesuguipollenites, Pantiaspermum, Taxaliospermum, Kryshtofovichiella, Carpodium, Taxopitys, Prototaxoxylon, Collospermum, Araucariales, Maheshwariella, Polysolenoxylon, Voltziostrobus, Barakaroxylon, Kaokoxylon, Nandorioxylon, Paradoxospermum, Tanaidia, Palaeocarpus, Cornucarpus, Surangephyllum, Cupressoconus, Arberiella, Megaporoxylon, Coniferales, Cardiocarpum, Tanaidocarpidium, Nidispermum, Alatocarpus, Rotundaspermum, Sonajorispermum, Belemnopteris, Sujfunophyllum, Archaeosperma, Otofeistia, Birsinghpuria, Cordaitopsida, Palispermum, Gondwanophyllites, Damudoxylon
Subtaxa: Spiroxylon
Distribution: found only at Singrauli (Permian of India)