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.
Known locations: Austalia. France. Denmark - Faxe Formation? India.
Time period: Cretaceous to the Danian of Paleocene. Possibly into the Eocene.
Fossil representation: Teeth.
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
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
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.
- 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.