Polysternon

{{Short description|Extinct genus of turtles}}

{{Automatic taxobox

|fossil_range = Campanian-Maastrichtian
~{{fossil range|70.6|66}}

|image = Polysternon provinciale skull.JPG

| image_caption = A fossil skull of Polysternon provinciale.

|taxon = Polysternon

|authority = Portis 1882

| subdivision_ranks = Species

| subdivision =

• P. isonae {{small|Marmi et al. 2012}}
• P. provinciale {{small|Matheron 1869 (type)}}

}}

Polysternon is a genus of turtles in the extinct family Bothremydidae. It was described by Portis in 1882, and contains the species P. provinciale (originally placed in the genus Pleurosternon), which existed during the Cretaceous of what is now France{{cite web |url=http://zientzia.eus/artikuluak/iraganaren-berri/ |title=Iraganaren berri |website=zientzia.eus |language=eu |date=1 June 2007 |access-date=23 November 2017}} and a new species, P. isonae, from the Late Maastrichtian of Spain.

The species epithet of P. isonae refers to the municipality Isona i Conca Dellà in Catalonia, where the type specimen was discovered in the Tremp Formation.{{cite journal |author1=J. Marmi |author2=Á.H. Luján |author3=V. Riera |author4=R. Gaete |author5=O. Oms |author6=À. Galobart |year=2012 |title=The youngest species of Polysternon: A new bothremydid turtle from the uppermost Maastrichtian of the southern Pyrenees |journal=Cretaceous Research |volume=35 |pages=133–142 |doi=10.1016/j.cretres.2011.12.004 |bibcode=2012CrRes..35..133M }}