Chondrichthyes - Petalodontiformes - Janassidae
Parent taxon: Petalodontiformes according to M. Ginter et al. 2010
See also Hodnett et al. 2024, Jordan 1963, Lund 1989 and Nelson 2006
Sister taxa: Belantseidae, Paracymatodus, Petalodontidae, Pristodontidae, Serratodus
Subtaxa: Cholodinae Ctenopetalus Cymatodus Dactylodus Fissodus Gamphacanthus Gomphacanthus Janassinae Petalodopsis Phoderacanthus Platacanthus Pnigeacanthus Pristicladodus Stichacanthus Thoracodus
Type: Janassa
Ecology: nektonic carnivore
Distribution:
• Permian of Germany (13 collections), Greenland (1), the Russian Federation (1), the United Kingdom (3), United States (9: Kansas, Texas, Wyoming)
• Carboniferous to Permian of the Russian Federation (1)
• Carboniferous of Japan (1), the United Kingdom (12), United States (8: Kansas, Kentucky, Montana, Nebraska, South Dakota)
Total: 49 collections including 56 occurrences