Riograndia
|
Riograndia Temporal range: Late Triassic ~225 Ma |
|
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Order: | Therapsida |
| Suborder: | Cynodontia |
| Clade: | Chiniquodontoidea |
| Family: | †Tritheledontidae |
| Genus: |
†Riograndia Bonaparte et al., 2001 |
| Type species | |
| †Riograndia guaibensis Bonaparte et al., 2001 |
|
Riograndia is an extinct genus of tritheledontid cynodonts from the Late Triassic of South America. The type and only species is Riograndia guaibensis. Remains have been found in the Caturrita Formation of the geopark of Paleorrota. It was a small non-mammalian cynodont several advanced features also present in mammals. Several specimens of Riograndia guaibensis have been found in the towns of Candelária and Faxinal do Soturno in the Caturrita Formation.
Riograndia is currently classified as a basal genus in the family Tritheledontidae. Other tritheledontids include the related Irajatherium, and two clades, a more basal group including Sinoconodon, Brasilitherium, Brasilodon, and Morganucodon, and a more derived clade of Chaliminia, Elliotherium, Pachygenelus, Diarthrognathus, and Tritheledon. The below cladogram was found by Martinelli and Rougier in 2007 and modified by Soares et al. in 2011, with Tritheledontidae added after Ruta et al. (2013):
...
Wikipedia