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Riograndidae (disused)
Taxonomy
Riograndidae was named by Bonaparte et al. (2001). It is not extant. It was considered monophyletic by Bonaparte et al. (2001).
It was synonymized subjectively with Therioherpetidae by Oliveira (2006).
It was assigned to Cynodontia by Bonaparte et al. (2001).
It was synonymized subjectively with Therioherpetidae by Oliveira (2006).
It was assigned to Cynodontia by Bonaparte et al. (2001).
Synonymy list
| Year | Name and author |
|---|---|
| 2001 | Riograndidae Bonaparte et al. p. 624 |
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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.
Fm. †Riograndidae Bonaparte et al. 2001
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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. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Carroll 1988, Hendy et al. 2009 | |||||
Collections
No collection or age range data are available