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Trachytherus alloxus
Taxonomy
Trachytherus alloxus was named by Billet et al. (2008). Its type specimen is MNHN-BOL-V 006355, a skull (Subcomplete skull with right and left I1, P2-M3; nasals missing), and it is a 3D body fossil. Its type locality is Salla, which is in a Deseadan terrestrial horizon in the Salla Formation of Bolivia.
Synonymy list
| Year | Name and author |
|---|---|
| 2008 | Trachytherus alloxus Billet et al. p. 156 figs. 1-15 (except 12B) |
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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.
†Trachytherus alloxus Billet et al. 2008
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Billet et al. 2008 | Differs from Trachytherus spegazzinianus in: smaller size; loss of M1 central fossette occurs when M2 presents contacting protoloph and metaloph or isolated central fossette (M1 central fossette always disappears before protoloph and metaloph contacts lingually in M2 of T. spegazzinianus); molars proportionally labio-lingually narrower; mesial lobe of the upper molars (protoloph) little rounded lingually after moderate wear, with a pointing disto-lingual extremity (as for deciduous premolars) and much larger than the distal lobe (unlike in T. spegazzin- ianus); lingual sulcus of the upper molars shallower and lack of lingual groove when central fossette is isolated; M3 poorly trilobed before enclosing the central fossette (M3 distinctly trilobed and with oblique mesial and distal faces in T. spegazzinianus); protoloph of M1 with smaller and much less persis- tent lingual enamel folds. Differs from Trachytherus? mendocensis in: larger size; P3 with a central fossette contemporaneous with M1–2 opened labially or even with M1 with isolated central fossette and M2 opened labially; upper pre- molars parallelogram-shaped, not triangular; poorly marked median lobe on upper molars, especially on M3. Differs from Trachytherus subandinus in: larger size; upper premolars parallelogram-shaped, not triangular to pentagonal. Differs from the undetermined (and undescribed) taxon reported by Shockey et al. (2006) from Moquegua Peru in its larger size. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Ji et al. 2002, Carroll 1988, Lillegraven 1979, MacFadden et al. 1996 | |||||