Name: Gladioserratus.
Phonetic: Glad-e-oh-seh-rah-tus.
Named By: Charlie J.‭ ‬Underwood,‭ ‬Anjali Goswami,‭ ‬G.‭ ‬V.‭ ‬R.‭ ‬Prasad,‭ ‬Omkar Verma‭ & ‬John J.‭ ‬Flynn‭ ‬-‭ ‬2011.
Synonyms: Notidanus aptiensis.
Classification: Chordata,‭ ‬Chondrichthyes,‭ ‬Elasmobranchii,‭ ‬Selachimorpha,‭ ‬Hexanchiformes,‭ ‬Hexanchidae.
Species: G.‭ ‬aptiensis‭ (‬type‭)‬,‭ ‬G.‭ ‬dentatus,‭ ‬G.‭ ‬magnus.
Diet: Carnivore/Piscivore.
Size: Unavailable.
Known locations: Austalia.‭ ‬France.‭ ‬Denmark‭ ‬-‭ ‬Faxe Formation‭? ‬India.
Time period: Cretaceous to the Danian of Paleocene.‭ ‬Possibly into the Eocene.
Fossil representation: Teeth.

       Gladioserratus is an extinct genus of cow shark that is known to have first appeared near the middle of the Early Cretaceous.‭ ‬Further fossil discoveries have led to the realisation that species of Gladioserratus lived all the way to the end of the Cretaceous and into the Paleocene.‭ ‬There has also been speculation that an extinct species of the genus Notorynchus,‭ ‬N.‭ ‬serratissimus should be synonymised into Gladioserratus,‭ ‬something that would‭ ‬extend the range of Gladioserratus even further into the Eocene.‭
       As a cow shark Gladioserratus would have likely been‭ ‬a generalist predator feeding upon everything from fish to crustaceans,‭ ‬and given the fact that Gladioserratus lived during the Cretaceous,‭ ‬quite possibly smaller marine reptiles.‭ ‬If like relative genera,‭ ‬Gladioserratus would have had only one dorsal fin situated further back near the tail.‭ ‬Gladioserratus would have also likely had at least six gills,‭ ‬not five like in more advanced forms.‭ ‬Some cow sharks are known to have seven gills,‭ ‬though it is still unknown if Gladioserratus had this many.

Further reading
-‭ ‬Marine vertebrates from the‭ ‘‬middle‭’ ‬Cretaceous‭ (‬early Cenomanian‭) ‬of South India.‭ ‬-‭ ‬Journal of Vertebrate Paleontology‭ ‬31‭ (‬3‭)‬:‭ ‬539‭–‬552.‭ ‬-‭ ‬Charlie J.‭ ‬Underwood,‭ ‬Anjali Goswami,‭ ‬G.‭ ‬V.‭ ‬R.‭ ‬Prasad,‭ ‬Omkar Verma‭ & ‬John J.‭ ‬Flynn‭ ‬-‭ ‬2011.
-‭ ‬A rare elasmobranch assemblage from the Valanginian‭ (‬Lower Cretaceous‭) ‬of southern France.‭ ‬-‭ ‬Cretaceous Research‭ ‬48:‭ ‬54‭–‬84.‭ ‬-‭ ‬Guillaume Guinot,‭ ‬Henri Cappetta‭ & ‬Sylvain Adnet‭ ‬-‭ ‬2014.
-‭ ‬Neoselachians from the Danian‭ (‬Early Paleocene‭) ‬of Denmark. -‭ ‬Acta Palaeontologica Polonica‭ ‬60‭ (‬2‭)‬:‭ ‬313‭–‬338.‭ ‬-‭ ‬Jan S.‭ ‬Adolfssen‭ & ‬David J.‭ ‬Ward‭ ‬-‭ ‬2015.


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