Chondrichthyes - Cochliodontiformes
Parent taxon: Holocephalomorpha according to J. A. Long 2011
See also Goto and Okura 2004 and Nelson 2006
Sister taxa: Chimaeriformes, Chondrenchelyiformes, Copodontiformes, Menaspiformes, Psammodontiformes, Squalorajiformes
Subtaxa: Cochliodontidae Psephodontidae Solenodus
Ecology: nektonic carnivore
Distribution:
• Permian of Japan (1 collection), Oman (5), Pakistan (8), the Russian Federation (2), Thailand (1), United States (3: Kansas, Wyoming)
• Atokan of United States (1: Arizona)
• Pennsylvanian of the United Kingdom (5)
• Osagean of United States (2: Indiana, Iowa)
• Carboniferous of Belgium (1), Egypt (1), Japan (1), the Russian Federation (2), the United Kingdom (6), United States (12: Arizona, Iowa, Kansas, Nebraska, Ohio, Pennsylvania)
• Mississippian of the United Kingdom (6), United States (1: Iowa)
• Devonian of United States (1: California)
Total: 59 collections including 98 occurrences