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Tritheledontidae
Taxonomy
Tritheledontidae was named by Broom (1912). It is not extant. Its type is Tritheledon. It was considered monophyletic by Martinelli and Rougier (2007).
It was reranked as the unranked clade Tritheledontidae by Martinelli and Rougier (2007).
It was assigned to Eucynodontia by Kemp (1982); to Chiniquodontoidea by Carroll (1988); to Probainognathia by Martinez et al. (1996); to Ictidosauria by Martinelli and Rougier (2007); to Brasilodontia by Bonaparte (2012); and to Mammaliamorpha by Huttenlocker et al. (2018).
It was reranked as the unranked clade Tritheledontidae by Martinelli and Rougier (2007).
It was assigned to Eucynodontia by Kemp (1982); to Chiniquodontoidea by Carroll (1988); to Probainognathia by Martinez et al. (1996); to Ictidosauria by Martinelli and Rougier (2007); to Brasilodontia by Bonaparte (2012); and to Mammaliamorpha by Huttenlocker et al. (2018).
Subtaxa
Chalimininae, Diarthrognathus, Elliotherium, Irajatherium, Pachygenelus, Pachygenelus milleri, Pattsia, Riograndia, Tritheledon (type genus)
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1912 | Tritheledontidae Broom p. 336 |
| 1982 | Tritheledontidae Kemp p. 349 |
| 1983 | Pachygenelus milleri Chatterjee p. 1152 fig. 1 |
| 1988 | Tritheledontidae Carroll |
| 1996 | Tritheledontidae Martinez et al. |
| 2007 | Tritheledontidae Martinelli and Rougier |
| 2012 | Tritheledontidae Bonaparte |
| 2018 | Tritheledontidae Huttenlocker et al. |
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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. †Tritheledontidae Broom 1912
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Unr. †Chalimininae Martinelli and Rougier 2007
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Invalid names: Pachygenelus milleri Chatterjee 1983 [nomen dubium]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. G. Martinelli and G. W. Rougier 2007 | Definition—The clade including the most recent common ancestor of Irajatherium hernandezi and Pachygenelus monus, and all its descendants.
Diagnosis—Derived ictidosaurs with a dominant central bulbous main cusp on upper postcanines, with cusps B and C buccally displaced; lower middle and posterior postcanines with four aligned cusps that decrease in size posteriorly; the posterior portion of secondary palate almost at the level of the tip of the postcanines, forming a deep groove between the hard palate and the tooth row. |
Measurements
No measurements are available
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| Source: c = class, subp = subphylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Carroll 1988 | |||||
Age range: base of the Norian to the top of the Early/Lower Hettangian or 228.00000 to 196.50000 Ma
Collections (26 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Norian | Argentina (San Juan) | Tritheledontidae indet. (182613) Tritheledontidae indet. 1, Tritheledontidae indet. 2 (182614) | |
| Norian | Argentina (La Rioja) | Chaliminia musteloides (52014 101991) | |
| Norian | Brazil (Rio Grande do Sul) | Irajatherium hernandezi, Riograndia guaibensis (55446 105530) Riograndia guaibensis (99665) Riograndia sp. (55442) | |
| Norian | USA (Texas) | Ictidosauria indet. (13273) Tritheledontidae indet. (48424) | |
| Early/Lower Hettangian | Canada (Nova Scotia) | Pachygenelus sp. (74206 74208 74209) | |
| Hettangian - Sinemurian | South Africa (Free State) | Diarthrognathus broomi (98632) Elliotherium kersteni (105703) Pachygenelus sp. (48391 48825 75196 232300 232313 232322) | |
| Hettangian - Sinemurian | Lesotho (Mafeteng) | Pattsia likhoelensis (123298) | |
| Hettangian - Sinemurian | South Africa (Eastern Cape) | Pachygenelus monus (75187) Pachygenelus sp. (75193) Tritheledon riconoi (36669) | |
| Hettangian - Sinemurian | Lesotho (Quthing) | Pachygenelus sp. (232328) |