Icochilus truncus Ameghino, 1894a
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.5931303 |
persistent identifier |
https://treatment.plazi.org/id/B0798797-FFA8-287A-72CB-CF33FB04FC01 |
treatment provided by |
Plazi |
scientific name |
Icochilus truncus Ameghino, 1894a |
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Icochilus truncus Ameghino, 1894a
Holotype. MACN-A 3635 ( Figs. 5 View FIGURE 5 J–K), right fragmented mandible with alveoli of i1 –dp1 and the series p2–m1.
Age and provenance of the type material. Santacrucian SALMA, early Miocene , Santa Cruz Province ( Argentina).
Original description ( Ameghino 1894a: 16). “ A peu près de la même taille que l’ I. extensus . Elle se distingue par la présence de la première prémolaire inférieure très petite, et par l'absence de la canine inférieure. A la place de la canine il y a un diastème assez étendu qui sépare l'incisive externe de la première prémolaire ”.
English translation. Size almost the same as Ic. extensus . It is distinguished by the presence of a very small first lower premolar, and by the absence of the lower canine. In the place of the lower canine there is a rather extensive diastema that separates the external incisor from the first premolar.
Comments. Ameghino (1894a) did not add any illustration to the brief description of I. truncus . According to Ameghino’s catalogue and Mones (1986), MACN-A 3635, a broken symphysis with a fragmented right mandibular ramus, is the type material of the species. This specimen has a small alveolus of dp1 and a diastema between i3 and dp1, whose length (2.2 mm) falls within the range (1 to 3 mm) that Ameghino provided for any gap between adjacent teeth ( Ameghino 1894a: 15–18). These characteristics are consistent with Ameghino’s (1894a) description and, consequently, MACN-A 3635 is confirmed as the holotype of Ic. truncus .
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Interatheriinae |
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