Icochilus truncus 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 : 213

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
status

 

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 .

Kingdom

Animalia

Phylum

Chordata

Class

Mammalia

Order

Notoungulata

Family

Interatheriidae

SubFamily

Interatheriinae

Genus

Icochilus

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