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)
• Tatarian of the Russian Federation (4)
• Permian of Brazil (2), Canada (3: Prince Edward Island), the Czech Republic (5), Germany (1), Norway (1), the Russian Federation (7), United States (43: New Mexico, Oklahoma, Texas, Utah)
• Carboniferous to Permian of United States (1: New Mexico)
• Carboniferous of Canada (1: Prince Edward Island), France (1), the United Kingdom (11), United States (5: Arizona, Illinois, Oklahoma)
Total: 103 collections including 117 occurrences