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Trachytypotherium sp
Taxonomy
Epipatriarchus innexus was named by Ameghino (1904).
It was recombined as Trachytypotherium sp by Vera et al. (2019).
It was recombined as Trachytypotherium sp by Vera et al. (2019).
Synonymy list
| Year | Name and author |
|---|---|
| 1904 | Epipatriarchus innexus Ameghino p. 16 |
| 1914 | Epipatriarchus innexus Rovereto p. 29 |
| 2019 | Trachytypotherium sp Vera et al. pp. 1148-1149 fig. 2 |
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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.
†Trachytypotherium sp Ameghino 1904
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. Vera et al. 2019 | Epipatriarchus innexus is represented only by its type specimen (MACN-A 11188) collected in the area of Lago Blanco and Rıo Fenix, according to Ameghino (1906), or Laguna Blanca according to the MACN catalogue. It is a broken upper molar which lacks its labial and distal faces, has a very high crown covered by cement, and has a narrow and a deep lingual sulcus that divides the crown into two lobes, the anterior being narrower than the posterior lobe (Fig. 2D). The lingual sulcus and the bilobed occlusal shape of MACN-A 11188 resemble the interatheriine pattern; however, although broken, the size of the molar (L > 8.3 mm; W > 6.6 mm) as well as its crown height exceeds any known range for interatheriine tooth sizes. In fact, this agrees with the description of Ameghino (1903, p. 206), who remarked “in spite of lacking the external side, [the molar] presents such considerable dimensions that it unquestionably belongs to a species twice as large as the previous [in reference to Epipatriarchus bifidens]”. Indeed, the dimensions and morphology of MACN-A 11188 are comparable with those of the Mayoan mesotheriids Trachytypotherium rectum Ameghino, 1904 (MACN-A 10366, Fig. 2E, F) and Trachytypotherium superans Ameghino, 1904 (MACN-A 11079). On the other hand, breakage of the distal face suggests that the specimen has lost its ‘third’ lobe, which is characteristic of upper molars in mesotheriids. Based on this, we conclude that Epipatriarchus innexus was erroneously identified as an Interatheriinae, belonging instead to Mesotheriidae Alston, 1876, as Trachytypotherium sp. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Carroll 1988, Hendy et al. 2009, MacFadden et al. 1996, Ji et al. 2002 | |||||