Polysternon

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^[1] and a new species, P. isonae, from the Late Maastrichtian of Spain.

Polysternon Temporal range: Campanian-Maastrichtian ~70.6–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
A fossil skull of Polysternon provinciale.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Testudines
Suborder:	Pleurodira
Family:	†Bothremydidae
Subtribe:	†Foxemydina
Genus:	†Polysternon Portis 1882
Species
P. isonae Marmi et al. 2012 P. provinciale Matheron 1869 (type)

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.^[2]

Species

• Polysternon provinciale Matheron, 1869
• Polysternon isonae Marmi et al., 2012

Distribution

Fossils of Polysternon have been found in:^[3]

• Rognacian Formation - France
• Vitoria, Sierra Perenchiza and Tremp Formations - Spain