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Pachybiotherium
Taxonomy
Pachybiotherium was named by Ameghino (1902). Its type is Pachybiotherium acclinum.
It was assigned to Didelphidae by Marshall (1982) and Carroll (1988); and to Microbiotheriidae by Ameghino (1902), Goin (1997), Goin et al. (2010) and Goin and Abello (2013).
It was assigned to Didelphidae by Marshall (1982) and Carroll (1988); and to Microbiotheriidae by Ameghino (1902), Goin (1997), Goin et al. (2010) and Goin and Abello (2013).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1902 | Pachybiotherium Ameghino p. 124 |
| 1982 | Pachybiotherium Marshall |
| 1988 | Pachybiotherium Carroll |
| 1997 | Pachybiotherium Goin |
| 2010 | Pachybiotherium Goin et al. |
| 2013 | Pachybiotherium 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.
G. †Pachybiotherium Ameghino 1902
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†Pachybiotherium acclinum Ameghino 1902
†Pachybiotherium illuminatum Goin et al. 2010
†Pachybiotherium minor Goin 1997
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. J. Goin and M. A. Abello 2013 | Pachybiotherium differs from other Microbiotheria in the following combination of characters: very high horizontal ramus; on its alveolar edge, the horizontal ramus de- creases sharply in height in the anterior portion, in such a way that the premolar alveolar series is at a lower level than the molar one; M4/m4 only slightly reduced in relation to M3/m3; lingually inclined protoconid of m1–m2; hipoconid in m1–m3 not labially salient; protocone of M1–M3 very wide anteroposteriorly. |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Hopson 1973, Carroll 1988, Hendy et al. 2009, Clemens 1979, Nowak 1991 | |||||
Age range: base of the Burdigalian to the top of the Laventan or 20.44000 to 11.00000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Colhuehuapian | Argentina (Chubut) | P. acclinum (141368) | |
| Burdigalian | Argentina (Santa Cruz) | P. illuminatum (59319 59320) | |
| Santacrucian | Argentina (Santa Cruz) | P. illuminatum (59324) | |
| Laventan | Colombia | P. minor (13749) |