Fadenia

Fadenia is an extinct genus of eugeneodontid holocephalian chondrichthyan from the Carboniferous Period of Missouri (United States), the Permian period of Greenland, and the Early Triassic epoch of British Columbia, Canada (Sulphur Mountain Formation).^[2][3]

Fadenia Temporal range: Carboniferous – Early Triassic, 320–247.2 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Fadenia crenulata
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Holocephali
Order:	†Eugeneodontida
Family:	†Caseodontidae
Genus:	†Fadenia Nielsen, 1932
Type species
†Fadenia crenulata Nielsen, 1932
Species
†F. gigas Eaton, 1962 †F. uroclasmato Mutter & Neuman, 2008

Early Triassic and Middle Triassic marine predators: 2. Fadenia^[1]

Discovery and naming

The first fossils of Fadenia were discovered and described in the periodical Meddelelser om Grønland in 1932 by the Danish vertebrate palaeontologist Eigil Nielsen after studying the Upper Permian beds of Cape Stosch, in the fjord of Godthab Gulf in King Christian X Land, East Greenland. Nielsen had joined at the beginning of the Three-year Expedition to East Greenland led by Danish geologist and explorer Lauge Koch. The manager of the expedition was the botanist Gunnar Seidenfaden, after whose surname the genus was named.^[4][5]

Classification

Fadenia belongs to Eugeneodontida, an extinct order of Chondrichthyes. They are characterized by the presence of tooth whorls. They include iconic genera, such as Helicoprion (buzz-saw shark), Ornithoprion, Edestus or Caseodus. Fadenia is one of the few eugeneodontid genera that survived the end-Permian mass extinction event. It is one of the last surviving genera of this clade. It could reach about 1.5 metres (4.9 ft) in length.^[2][1]

References

1. Scheyer, Torsten M.; Romano, Carlo; Jenks, Jim; Bucher, Hugo (2014). "Early Triassic Marine Biotic Recovery: The Predators' Perspective"". PLOS ONE. 9 (3): e88987. Bibcode:2014PLoSO...988987S. doi:10.1371/journal.pone.0088987. PMC 3960099. PMID 24647136.
2. Mutter, Raoul J.; Neuman, Andrew G. (2008). "New eugeneodontid sharks from the Lower Triassic Sulphur Mountain Formation of Western Canada". In Cavin, L.; Longbottom, A.; Richter, M. (eds.). Fishes and the Break-up of Pangaea. Geological Society of London, Special Publications. Vol. 295. London: Geological Society of London. pp. 9–41. doi:10.1144/sp295.3.
3. "Fossilworks: Fadenia".
4. Nielsen, Eigil (1932). "Permo-Carboniferous fishes from east Greenland". Meddelelser om Grønland. 86 (3): 1–63..
5. Nielsen, Eigil (1952). "On new or little known Edestidae from the Permian and Triassic of East Greenland". Meddelelser om Grønland. 144: 1–55..

Further reading

• Bendix-Almgreen, S. E. (1975). "Fossil fishes from the marine Late Palaeozoic of Holm Land – Amdrup Land, north-east Greenland". In: Meddelelser om Grønland. 195: 3–38.
• Ginter, M.; Hampe, O. & Duffin, C. J. (2010). "Chondrichthyes. Paleozoic Elasmobranchii: Teeth". Handbook of Paleoichthyology. Volume 3D: 1–168.

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