Interatherium dentatum Ameghino, 1894a

Fernández, Mercedes, Fernicola, Juan Carlos & Cerdeño, Esperanza, 2019, On the type materials of the genera Interatherium Ameghino, 1887 and Icochilus Ameghino, 1889 (Interatheriidae, Notoungulata, Mammalia) from early Miocene of the Santa Cruz Province, Argentina, Zootaxa 4543 (2), pp. 195-220 : 202

publication ID

https://doi.org/ 10.11646/zootaxa.4543.2.2

publication LSID

lsid:zoobank.org:pub:11F546CD-109F-4CBC-B87D-EA8D1AD0B96F

DOI

https://doi.org/10.5281/zenodo.5931277

persistent identifier

https://treatment.plazi.org/id/B0798797-FFBD-286F-72CB-CDD1FD29F8A3

treatment provided by

Plazi

scientific name

Interatherium dentatum Ameghino, 1894a
status

 

Interatherium dentatum Ameghino, 1894a

Holotype. MACN-A 9863 ( Fig. 1 E View FIGURE 1 ), anterior cranial fragment and an almost complete mandible in anatomical connection.

Age and provenance of the type material. Santacrucian SALMA, early Miocene , Santa Cruz Province ( Argentina).

Original description ( Ameghino 1894a: 18). “ Par la taille se rapproche de 1’ I. supernum ; il s'en distingue pour posséder une prémolaire de plus à la mâchoire supérieure, c'est-à-dire cinq au lieu de quatre. Les deux premières prémolaires sont coniques, la première ou antérieure étant séparée de la deuxième. La série dentaire supérieure complète occupe un espace de 41 mm ”.

English translation. It is close to I. supernum by its size; it differs from it in having an additional premolar in the maxilla, which means five instead of four. The first two premolars are conical, the first (or anterior) being separated from the second. The complete upper dental series occupies a space of 41 mm.

Comments. Ameghino (1894a) did not add any illustration to the original description. No specimen is indicated as the type material of I. dentatum in Ameghino’s catalogue, and Mones (1986) wrote “MACN?”, which means doubts or lack of information regarding the type that could be housed at the MACN.

There are three specimens assigned to I. dentatum within the Ameghino Collection: the articulated skull and mandible MACN-A 9863, and two fragmented maxillae, MACN-A 9864 and MACN-A 9865, corresponding to two different individuals. These maxillae lack its anterior portion, so the region that should contain the extra premolar is not preserved in any of them; as the areas of breakage are not recent, both specimens are discarded as the type. Instead, MACN-A 9863 matches the original description ( Ameghino 1894a) as it presents an extra alveolus between C and dP1, which is separated from the latter by a distinct diastema. The length of left I1 –M3 series (41.3 mm) also matches the only measurement provided by Ameghino (1894a). Consequently, MACN-A 9863 is considered the holotype of I. dentatum .

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