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Pollyosbornia altidens

Mammalia - Perissodactyla - Brontotheriidae

Taxonomy
Telmatherium altidens was named by Osborn (1908).

It was recombined as Pollyosbornia altidens by Mihlbachler (2008).

Synonymy list
YearName and author
1908Telmatherium altidens Osborn
2008Pollyosbornia altidens Mihlbachler

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Synapsida()
RankNameAuthor
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
Placentalia
orderPerissodactyla()
familyBrontotheriidae()
subfamilyBrontotheriinaeMarsh 1873
tribeBrontotheriiniMarsh 1873
subtribeBrontotheriinaMarsh 1873
EmbolotheriitaOsborn 1929
genusPollyosbornia
speciesaltidens()

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.

Diagnosis
ReferenceDiagnosis
M. C. Mihlbachler 2008Pollyosbornia altidens is a large brontothere with an unreduced dental formula (3-1-4-3). The incisors are of mod- erate or large size and form an arched incisor row. The symphysis is relatively elongate and extends posteriorly to the p3 talonid. Other features include a relatively long postcanine diastema, a metaconid on p3 and p4 but not on p2, a very poorly developed p2 talonid, a p2 trigonid that is at least twice the length of the talonid, an elongate m3, and shallow trigonid and talonid molar basins.
From what can be discerned of the poorly preserved holotype mandible, Pollyosbornia altidens is more or less consistent with Diplacodon elatus except for its larger size, and more poorly developed p2 talonid.