Two new taxa (Caviomorpha, Rodentia) from the early Oligocene Tinguiririca fauna (Chile)
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Two new taxa (Caviomorpha, Rodentia) from the early Oligocene Tinguiririca fauna (Chile)

Title Variants

Alternative: Early Oligocene Tinguiririca rodents

Related Titles

Series: American Museum novitates, no. 3750


Bertrand, Ornella C.
Flynn, John J. (John Joseph), 1955-
Croft, Darin A.
Wyss, André R.




Published material

Publication info

[New York] :American Museum of Natural History,c2012.


Caption title.

"July 20, 2012."

Here we describe two new caviomorphs from the early Oligocene Tinguiririca fauna of the Andean Main Range of central Chile, representing the most ancient rodents known from the mid to high latitudes of South America, and the second-oldest securely dated rodents from the continent. These two new taxa are each documented by single partial mandibles bearing largely complete dentitions. Representing two new taxa, Andemys termasi, gen. et sp. nov., and Eoviscaccia frassinettii, sp. nov., these caviomorphs are informally referred to the pan-Dasyproctidae and pan-Chinchillidae, respectively. These taxa, together with recent findings in Peru, confirm that caviomorphs were well diversified prior to the Deseadan SALMA, that they likely originated during the middle to late Eocene, but that they did not spread from the tropics until some time after the Mustersan--a well-sampled interval from which rodents are unknown in higher latitudes. Additionally, in documenting the earliest occurrence of hypsodonty among caviomorphs Eoviscaccia frassinettii, sp. nov., provides important insights into the acquisition of this common mammalian dental innovation in rodents.


Andemys termasi , Caviomorpha , Chile , Eoviscaccia frassinettii , Mammals, Fossil , Oligocene , Paleontology , Rodents, Fossil , Teeth, Fossil , Tinguiririca River Region

Call Number

QL1 .A436 no.3750 2012




OCLC: 801402510


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