Gamerabaena

Gamerabaena Temporal range: Late Cretaceous
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Subphylum:	Vertebrata
Superclass:	Tetrapoda
Class:	Sauropsida
Order:	Testudines
Suborder:	Cryptodira
Infraorder:	Paracryptodira
Family:	Baenidae
Genus:	Gamerabaena Lyson and Joyce, 2010
Species
G. sonsalla Lyson and Joyce, 2010 (type)

Gamerabaena is an extinct genus of baenid turtle which existed in North Dakota during the late Cretaceous period. It is known from a single fragmentary skull that was found in the Maastrichtian-age Hell Creek Formation. It contains the species Gamerabaena sonsalla. Gamerabaena is similar to the genus Palatobaena, but it differs in its lack of a posterior expansion of the triturating (or chewing) surface, a somewhat rectangular skull, and a wide angle between the maxillae. Gamerabaena also has a lingual ridge on the inner side of the jaw that is not seen in Palatobaena.

Gamerabaena is considered the sister taxon of Palatobaena and shares features with both Palatobaena and Plesiobaena. These features, which include slightly upturned eye sockets, are seen as intermediate between the two other genera. While Gamerabaena is known only from the skull, it may belong to the same species as "Baena" hayi, which is known primarily from the shell.

Phylogeny

Cladogram after Tyler R. Lyson and Walter G. Joyce (2009).

Pleurosternon bullockii Glyptops plicatulus  Baenidae   Neurankylinae  Neurankylus eximius Trinitichelys hiatti  Eubaeninae  Hayemys latifrons  Baenodda  Plesiobaenini Plesiobaena antiqua Peckemys brinkman Cedrobaena putorius Gamerabaena sonsalla Palatobaena cohen Palatobaena bairdi Palatobaena gaffneyi  Eubaenini Boremys pulchra Boremys grandis Eubaena cephalica Goleremys mckennai Stygiochelys estesi Baena arenosa Chisternon undatum

External links

• Gamerabaena at the Fossil Wiki.