Chondrichthyes - Xenacanthiformes
Parent taxon: Xenacanthimorpha according to J. A. Long 2011
See also Cappetta 1987, Ginter et al. 2010, Heckert 2004, Murry 1989 and Nelson et al. 2016
Sister taxon: Bransonelliformes
Subtaxa: Diplodoselachidae Xenacanthidae Xenosynechodontidae
Ecology: nektobenthic carnivore
Distribution:
• Triassic of Australia (2 collections), Austria (1), India (1), Poland (1), United States (13: Arizona, New Mexico, Texas)
• Severodvinian of the Russian Federation (3)
• Tatarian of the Russian Federation (4)
• Leonard of United States (7: Oklahoma, Texas)
• Wolfcamp of United States (6: New Mexico, Utah)
• Permian of Brazil (2), the Czech Republic (5), Germany (1), Norway (1), the Russian Federation (4), United States (30: Oklahoma, Texas)
• Desmoinesian of United States (1: Oklahoma)
• Pennsylvanian of the United Kingdom (1)
• Carboniferous to Permian of United States (1: New Mexico)
• Carboniferous of France (1), the United Kingdom (9), United States (4: Arizona, Illinois, Oklahoma)
Total: 98 collections including 112 occurrences