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Riograndia
Taxonomy
Riograndia was named by Bonaparte et al. (2001). Its type is Riograndia guaibensis. It was considered monophyletic by Bonaparte et al. (2001) and Soares et al. (2011).
It was assigned to Riograndidae by Bonaparte et al. (2001); to Therioherpetidae by Oliveira (2006); to Tritheledontidae by Soares et al. (2011); and to Brasilodontia by Bonaparte (2012).
It was assigned to Riograndidae by Bonaparte et al. (2001); to Therioherpetidae by Oliveira (2006); to Tritheledontidae by Soares et al. (2011); and to Brasilodontia by Bonaparte (2012).
Species
R. guaibensis (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2001 | Riograndia Bonaparte et al. p. 624 |
| 2006 | Riograndia Oliveira p. 451 |
| 2011 | Riograndia Soares et al. p. 331 |
| 2012 | Riograndia Bonaparte |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Riograndia Bonaparte et al. 2001
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†Riograndia guaibensis Bonaparte et al. 2001
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. F. Bonaparte et al. 2001 | As for type species.
Advanced cynodonts with the following associated derived characters: (1) absence of postfrontal; (2) weak anterior portion of the zygomatic arch; (3) dorsoventrally deep lacrimal; (4) secondary bony palate extending posterior to the last postcanine; (5) contact of ventral process of frontal with dorsal process of palatine; (6) reduced upper incisor 1 and hypertrophied lower incisor 1; (7) last upper and lower postcanine crowns imbricated, teeth implanted at an angle to the long axis of the palate; (8) postcanines blade-like with 5 ± 9 subequal small, sharp cuspules regularly distributed on the almost semicircular border of the crown in the upper postcanine crown and in the posterodorsal border of the lower ones. |