The description of a new large caseid, Ruthenosaurus russellorum n. gen., n. sp. from the Early Permian (upper Cisuralian to lower Lopingian) of the Rodez Basin, France, is based on a partial postcranial skeleton that was initially collected at the same time as the holotype of "Casea" rutena Sigogneau-Russell & Russell, 1974. Despite its distinctly larger size than "C." rutena, the holotype of Ruthenosaurus n. gen. clearly represents an immature individual, as shown most clearly by the lack of fusion of the neural arches to their respective vertebral centra and incomplete ossification of the ends of the limb elements, including the absence of an ossifi ed olecranon on the ulna. Nonetheless, Ruthenosaurus n. gen. is diagnosed by several autapomorphic characters, including dorsal vertebrae with anteriorly tilting neural spines and a diamond-shaped outline in transverse section, a first sacral rib with a dorsoventrally expanded distal head, and a low iliac blade with a poorly developed anterior process. The new taxon is further distinguishable from the only other known French caseid, "Casea" rutena, by the shape of the distal part of the humerus, including an ectepicondylar notch rather than a fully enclosed foramen, the specifi c shape of the ulna, and the overall robustness of the specimen. The taxonomic status of "Casea" rutena is discussed and it is concluded that this species should be moved into a new genus named Euromycter n. gen. The occurrence of the large-sized Ruthenosaurus n. gen. in France increases our knowledge about the early diversity of this clade in Europe.

Additional Metadata
Keywords Caseasauria, Caseidae, Europe, France, New genera, New species, Permian, Synapsida
Persistent URL dx.doi.org/10.5252/g2011n2a2
Journal Geodiversitas
Citation
Reisz, R.R. (Robert R.), Maddin, H, Fröbisch, J. (Jörg), & Falconnet, J. (Jocelyn). (2011). A new large caseid (Synapsida, Caseasauria) from the Permian of Rodez (France), including a reappraisal of "casea" rutena sigogneau- Russell & Russell, 1974 Un nouveau grand caséidé (Synapsida, Caseasauria) du Permien du bassin de Rodez, France, et réévaluation de "Casea" rutena Sigogneau-Russell & Russell, 1974. Geodiversitas, 33(2), 227–246. doi:10.5252/g2011n2a2