Chondrichthyes - Petalodontiformes - Janassidae
Parent taxon: Petalodontiformes according to M. Ginter et al. 2010
See also Jordan 1963, Lund 1989 and Nelson 2006
Sister taxa: Belantseidae, Paracymatodus, Petalodontidae, Pristodontidae, Serratodus
Subtaxa: Cholodus Ctenopetalus Cymatodus Dactylodus Fissodus Gamphacanthus Gomphacanthus Janassa Petalodopsis Phoderacanthus Platacanthus Pnigeacanthus Pristicladodus Stichacanthus Thoracodus
Ecology: nektonic carnivore
Distribution:
• Permian of Germany (13 collections), Greenland (1), the Russian Federation (1), the United Kingdom (3), United States (7: Kansas, Texas, Wyoming)
• Carboniferous to Permian of the Russian Federation (1)
• Carboniferous of Japan (1), the United Kingdom (11), United States (7: Kansas, Montana, Nebraska, South Dakota)
Total: 45 collections including 51 occurrences