Chondrichthyes - Petalodontiformes
Alternative spelling: Petalodontida
Full reference: R. Zangerl. 1981. Chondrichthyes I: Paleozoic Elasmobranchii. Handbook of Paleoichthyology 3a
Parent taxon: Holocephali according to J. A. Long 2011
See also Ginter et al. 2010, Goto and Okura 2004, Nelson 2006, Nelson et al. 2016 and Sepkoski 2002
Sister taxa: Chimaeri, Debeeriformes, Debeeriiformes, Delphyodontos, Edaphodus, Eugeneodontiformes, Helodontiformes, Holocephalomorpha, Iniopterygiformes, Macrodontacanthus, Menaspacanthus, Orodontiformes, Paraselachiamorpha, Paraselachimorpha, Thoralodus, Trachyacanthi, Ageleodus, Desmiodus, Lagarodontidae, Cynopodius, Mesolophodus, Euglossodus, Brachyrhizodus, Metaxyacanthus, Gregoriidae, Pseudodontichthyidae
Subtaxa: Belantseidae Janassidae Paracymatodus Petalodontidae Pristodontidae Serratodus
Distribution:
• Cretaceous of Italy (1 collection), United States (3: Arizona)
• Permian of Bolivia (1), Brazil (1), China (2), Germany (13), Greenland (1), Iran (1), Japan (6), Oman (1), Pakistan (1), the Russian Federation (2), the United Kingdom (3), United States (20: Arizona, Kansas, New Mexico, Oklahoma, Texas, Wyoming)
• Carboniferous to Permian of the Russian Federation (1)
• Carboniferous of Canada (1: Nova Scotia), Greenland (1), Italy (2), Japan (1), the Russian Federation (1), Slovenia (2), the United Kingdom (25), United States (45: Alabama, Arizona, Indiana, Iowa, Kansas, Kentucky, Montana, Nebraska, New Mexico, Ohio, Oklahoma, Pennsylvania, South Dakota, Texas, West Virginia)
Total: 135 collections including 196 occurrences