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Tribactonodon
Taxonomy
Tribactonodon was named by Sigogneau-Russell et al. (2001). Its type is Tribactonodon bonfieldi.
It was assigned to Aegialodontia by Sigogneau-Russell et al. (2001), Kielan-Jaworowska et al. (2004).
It was assigned to Aegialodontia by Sigogneau-Russell et al. (2001), Kielan-Jaworowska et al. (2004).
Species
T. bonfieldi (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2001 | Tribactonodon Sigogneau-Russell et al. p. 143 |
| 2004 | Tribactonodon Kielan-Jaworowska et al. pp. 411, 419 fig. 11.4C |
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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. †Tribactonodon Sigogneau-Russell et al. 2001
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†Tribactonodon bonfieldi Sigogneau-Russell et al. 2001
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. Sigogneau-Russell et al. 2001 | Aegialodon, close in age and provenance (Valanginian of Sussex, England [11]), has a weaker lingual cingulid, apparently restricted to the paraconid, a smaller cusp e and a weaker antero-labial cingulum with no detached cusp f (due to wear?). The paraconid is inclined anteriorly. The trigonid is wider, with an especially strong protoconid and the talonid shorter with an uncertain entoconid (N.B. Postmortem damage of the holotype and only specimen of A. dawsoni makes diagnostic characters particularly difficult to recognize for this genus and thus to distinguish from Tribactonodon). Moreover, Tribactonodon differs from all other Laurasian ‘tribotheres’ mentioned below by presence of a lingual cingulid. In addition, differs from Pappotherium Slaughter, 1965, Holoclemensia (Slaughter, 1968) and Paleomolops Cifelli, 1994, in retaining a distal metacristid. Differs from Potamotelses Fox, 1972, by having a cusp e and a narrower talonid whose three cusps exhibit different proportions. Differs from Trinititherium Butler, 1978, by the presence of an entoconid and a talonid not labially orientated distally. Differs from Slaughteria Butler, 1978, which has no distal metacristid (worn according to Butler 1978), no true talonid basin and lacks cusp e. Closest to Kermackia Slaughter, 1971, but differs from it in having a larger cusp f, a cusp e, and a talonid that is less labially orientated (metacristid less oblique) while the talonid basin itself is more occlusally orientated; (trigonid of Kermackia badly preserved). Differs from Kielantherium Dashzeveg, 1975 (a genus we consider as distinct from Aegialodon, contra McKenna & Bell [13]), in having larger cusps e and f and an entoconid. Differs from the Gondwanan genus Ambondro Flynn, Parrish, Rakotosamimanana, Simpson & Wyss, 1999, by the isolation of cusp e from the cingulid, ?the degree of development of f, a longer talonid provided with an entoconid and different proportions of the other talonid cusps. Differs from the Gondwanan genus Hypomylos Sigogneau-Russell, 1992, by a better developed paraconid, presence of cusp e and of an entoconid. Differs from Prokennalestes Kielan-Jaworowska & Dashzeveg, 1989, the oldest accepted eutherian (which also retains an anterior cingulum under the paraconid and an antero-labial cingulum), by the persistence of a distal metacristid, the presence of cusp e, a strong cusp f, a larger paraconid and smaller hypoconid (although size of the latter cusp varies from M/1 to M/3 in Prokennalestes; this is true also of the talonid proportions, those of BMNH M51816 being very similar to those of the M/3 of this genus). |
Measurements
No measurements are available
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| Source: subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Carroll 1988, Hopson 1973, Hendy et al. 2009 | |||||
Age range: Late/Upper Berriasian or 139.10000 to 137.05000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Berriasian | United Kingdom (England) | T. bonfieldi (121520) |