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Oligobiotherium divisum
Taxonomy
Oligobiotherium divisus was named by Ameghino (1902). Its type specimen is MACN 52-374, a mandible (a fragment of a right mandibular ramus with posterior root of m2, m3 missing metaconid, and roots of m4), and it is a 3D body fossil. Its type locality is Gran Barranca - southern cliff of lake Colhué Huapí, which is in a Colhuehuapian terrestrial horizon in the Sarmiento Formation of Argentina. It is the type species of Oligobiotherium.
It was recombined as Microbiotherium divisum by Marshall (1982); it was corrected as Oligobiotherium divisum by Goin and Abello (2013).
It was recombined as Microbiotherium divisum by Marshall (1982); it was corrected as Oligobiotherium divisum by Goin and Abello (2013).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1902 | Oligobiotherium divisus Ameghino p. 125–126 |
| 1932 | Microbiotherium hernandezi Simpson p. 253 |
| 1953 | Microbiotheridion hernandezi Ringuelet p. 280 |
| 1982 | Microbiotherium divisum Marshall |
| 2013 | Oligobiotherium divisum Goin and Abello |
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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.
†Oligobiotherium divisum Ameghino 1902
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Invalid names: Microbiotherium hernandezi Simpson 1932 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. J. Goin and M. A. Abello 2013 | Oligobiotherium divisum di ers from other Microbiotheria by the following combination of featu- res: m4 reduced in relation to m3, lower canine subvertical, horizontal ramus low; the alveolar edge is even at the p3–m1 boundary (i.e., alveolar plane without height di erence between premolars and molars); p2 aligned with p3–m4 series; paraco- nids in m1–m2 not compressed antero-posteriorly; protoconid in m1 lingually bended, while that of m2 vertical; postcristid of m1–m2 transverse to the molar axis; metaconid posterior to the protoconid in m1–m2. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Hopson 1973, Lillegraven 1979, Nowak 1991, Hendy et al. 2009, Clemens 1979, Carroll 1988 | |||||
Age range: base of the Burdigalian to the top of the Colhuehuapian or 20.44000 to 17.50000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Colhuehuapian | Argentina (Chubut) | Oligobiotherium divisus, Microbiotherium hernandezi (type locality: 141368) | |
| Burdigalian | Argentina (Santa Cruz) | Microbiotherium divisum (59319 59320 59321) |