Parent taxon: Coniferophyta according to E. Taylor et al. 2008
See also Dilcher et al. 2005 and Hilton and Edwards 1999
Sister taxa: Abietoxylon, Abiocaulis, Albertia, Alloxylon, Anomaloxylon, Arctoxylon, Benstedtia, Borysthenia, Callitrites, Calloxylon, Cedrophloios, Ceratostrobus, Cheirostrobus, Cladocupressoxylon, Coniferoxylon, Cormaraucarioxylon, Cormocedroxylon, Cormocupressoxylon, Cryptomerites, Cupressoxylon, Cycadocarpidium, Dammarophyllum, Dictyodendron, Eleoxylon, Eurysacis, Germaria, Glyptolepidium, Glyptostroboxylon, Hiltonia, Krauselcladus, Lebachia, Legnophora, Legnophora girardi, Libocedrites, Lutuginia, Macrostachya, Metacedroxylon, Paleotaxites, Paraphyllocladoxylon, Parapinuxylon, Phleboxylon, Phyllocladopitys, Phyllostrobus, Pityites, Pityocladus, Platyspiroxylon, Protobrachyoxylon, Protocedroxylon, Protojuniperoxylon, Protopiceoxylon, Protopinuxylon, Protopodocarpoxylon, Pseudoaraucarites, Pseudotaxodioxylon, Retinoxylon, Rhizocedroxylon, Rhizotaxodioxylon, Sboromirskia, Spiroxylon, Storgaardia, Swedenborgia, Taxeopsis, Taxoxylon, Taxoxylum, Thylloxylon, Trematoxylon, Walchia, Walchiostrobus, Zamioidea
Subtaxa: Amyelon Apaloxylon Aporoxylon Arberia Archaeopitys Botryoconus Caenoxylon Callixylon Caracuboxylon Cauloxylon Cheirophyllum Cladites Conchophyllum Cordaianthopsis Cordaianthus Cordaicarpus Cordaicladus Cordaifloyos Cordaiopsis Cordaiphloeum Cordaispermum Cordaistrobus Cormocordaites Dictyocordaites Dolianitia Dorycordaites Eristophyton Hypsilocarpus Lepidoxylon Medullopitys Mesoxyloides Mesoxylon Mesoxylopsis Metacordaites Ormoxylon Pelourdea Pericordaites Pinuxylon Pitus Pityeae Poacordaixylon Poroxylon Premnoxylon Pycnophyllites Pycnoxylon Radiculites Rhiptozamites Rhizocordaites Samarospadix Schutzia Scutocordaites Squamophyllum Taeniophyllum Titanophyllum Tithymalites Xylophyllum
Distribution:
• Jurassic to Cretaceous of Malaysia (1 collection)
• Jurassic of China (1), the United Kingdom (1)
• Triassic to Jurassic of Canada (1: Northwest Territories)
• Triassic of Argentina (1), India (2), Italy (3), Mexico (5), Mongolia (3), Switzerland (1), United States (5: New Mexico, North Carolina)
• Permian to Triassic of India (1)
• Permian of Antarctica (2), Argentina (4), Australia (4), Brazil (11), China (10), the Congo-Kinshasa (1), the Czech Republic (1), Egypt (1), France (3), Germany (3), India (17), Italy (1), Madagascar (2), Mongolia (2), Morocco (1), Niger (1), North Korea (2), Oman (1), the Russian Federation (32), South Africa (7), South Korea (2), Spain (1), Thailand (1), the United Kingdom (1), United States (2: Kansas, Texas), Zambia (1)
• Namurian of Spain (1)
• Carboniferous of Belgium (1), Brazil (1), Canada (5: New Brunswick, Nova Scotia), France (1), Germany (2), the Netherlands (2), Portugal (1), the United Kingdom (35), United States (17: Colorado, Illinois, Indiana, Kansas, Michigan, Missouri, New Mexico, Ohio, Oklahoma, Utah)
• Devonian of Canada (3: Alberta, Nunavut), United States (35: Indiana, Kentucky, Michigan, New York, Ohio, Pennsylvania, Virginia, West Virginia)
Total: 243 collections including 323 occurrences