Fadenia

Name: Fadenia.
Phonetic: Fa-den-e-ah.
Named By: E.‭ ‬Nielsen‭ ‬-‭ ‬1932.
Classification: Chordata,‭ ‬Chondrichthyes,‭ ‬Holocephali‭?‬,‭ ‬Eugeneodontida,‭ ‬Caseodontidae.
Species: F.‭ ‬crenulata,‭ ‬F.‭ ‬gigas,‭ ‬F.‭ ‬uroclasmato.
Diet: Carnivore/Piscivore.
Size: Measurements unavailable.
Known locations: Canada,‭ ‬British Columba.‭ ‬Greenland.‭ ‬USA,‭ ‬Missouri.
Time period: Moscovian of the Carboniferous through to the Olenekian of the Triassic.
Fossil representation: Several individuals at various states of preservation including teeth,‭ ‬skulls,‭ ‬post cranial remains,‭ ‬pectoral fins and at least one caudal fin.

       Fadenia is a genus of cartilaginous fish that belongs within the Eugeneodontida,‭ ‬a group that contains very bizarre forms such as Edestus,‭ ‬Helicoprion and Sarcoprion.‭ ‬Although popularly dubbed sharks,‭ ‬the eugeneodonts are usually placed within the Holocephali,‭ ‬a group distinct from sharks‭ ‬(that are classed within the Elasmobranchii‭) ‬that also includes the cartilaginous fish that we know today as chimaeras.‭ ‬Both sharks and Chimaeras are related to one another however as they are classed together within the Chondrichthyes,‭ ‬However,‭ ‬while possibly related to chimaeras,‭ ‬specimens of Fadenia show that this genus had a body form that was more like that of sharks than chimaeras.‭ ‬This in turn has led some to question if the Holocephali is the best home for the eugeneodonts.‭ ‬It may just be however that the eugeneodonts had shark-like bodies because it was such a good form for swimming,‭ ‬in a similar manner to ichthyosaurs looking fish like despite them being reptiles.

Further reading
-‭ ‬Permo-Carboniferous fishes from east Greenland.‭ ‬-‭ ‬Meddelelser om Grønland‭ ‬86‭(‬3‭)‬:1-63‭ ‬-‭ ‬E.‭ ‬Nielsen‭ ‬-‭ ‬1932.
‭ ‬-‭ ‬Teeth of Edestid Sharks.‭ ‬-‭ ‬University of Kansas Publications Museum of Natural History‭ ‬12‭(‬8‭)‬:347-362‭ ‬-‭ ‬T.‭ ‬H.‭ ‬Eaton‭ ‬-‭ ‬1962.
-‭ ‬New eugeneodontid sharks from the Lower Triassic Sulphur Mountain Formation of western Canada.‭ ‬Fishes and the Break-up of Pangaea.‭ ‬-‭ ‬Geological Society,‭ ‬London,‭ ‬Special Publication‭ ‬295:9-41‭ ‬-‭ ‬R.‭ ‬J.‭ ‬Mutter‭ & ‬A.‭ ‬G.‭



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