Full reference: A. B. Doweld. 2001. Prosyllabus Tracheophytorum. Tentamen Systematis Plantarum Vascularium.
Parent taxon: Pinophyta according to A. B. Doweld 2001
Sister taxa: Condylites, Masculostrobus, Palaeocyparis, Pinopsida, Podocarpopsida, Satyrites incertus, Taxopsida, Polyloboxylon, Nandorioxylon, Belemnopteris, Zalesskioxylon, Niponophyllum, Scirroma, Voltziostrobus, Pakuriospermum, Savitrispermum, Sujfunophyllum, Coniferae, Surangephyllum, Uesuguipollenites, Prototaxopitys, Archaeosperma, Tanaidia, Bennettitales, Tanaidocarpidium, Alatocarpus, Stephanostoma, Rotundaspermum, Prototaxoxylon, Aethophyllum, Nidispermum, Indoxylon, Bulbospermum, Sertostrobus, Araucariales, Damudoxylon, Maheshwariella, Nummulospermum, Taxaliospermum, Polysolenoxylon, Parapalaeoxylon, Coniferales, Paradoxospermum, Stereocarpus, Barakaroxylon, Cornucarpus, Kryshtofovichiella, Taxineae, Sonajorispermum, Birsinghpuria, Palaeocarpus, Cupressoconus, Carpodium, Retortistoma, Otofeistia, Cardiocarpum, Trigonomyelon, Palispermum, Shivacarpus, Triangulospermum, Pantiaspermum, Pyriformispermum, Kamthioxylon, Collospermum, Kaokoxylon, Taxopitys, Entylissa, Platycardia, Arberiella, Cordaitopsida, Sclerospiroxylon, Megaporoxylon, Gondwanophyllites
Subtaxa: Ferugliocladales Palissyales Ullmanniales Voltziales