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Incamys

Extinct genus of rodents From Wikipedia, the free encyclopedia

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Incamys is an extinct genus of chinchillid rodent that lived during the Late Oligocene (Deseadan) in what is now South America. Fossils of this genus have been found in the Salla Formation of Bolivia and the Agua de la Piedra[1] and Sarmiento Formations of Argentina.[2] Research on endocasts suggest they were group living using call communication like modern chinchillas.[3]

Quick Facts Scientific classification, Type species ...
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Taxonomy

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Incamys was first described by Hoffstetter and Lavocat, based on remains found in the Salla Formation of Bolivia, with the proposed type species being Incamys bolivianus, referring to the country it was found in. Later, in 1976, a new species was named, I. pretiosus,[4] which was subsequently found to be a junior synonym of the type species. In 2015, Vucetich and colleagues described a new species of Incamys, I. menniorum, from the Sarmiento Formation of Chubut Province, Argentina.[5]

The following cladogram of the Caviomorpha is based on Busker et al. 2020, showing the position of Incamys.[6]

Baluchimyinae

Bugtimys zafarullahi

"Phiomorpha"

Phiomys andrewsi

Metaphiomys schaubi

Octodontoidea

Prospaniomys priscus

Myocastor coypus

Echimyidae

Proechimys polioplus

Eumysops laeviplicatus

Kannabaetomys amblyonyx

Echimys chrysurus

Plataeomys brevis

Pithanotomys columnaris

Octomys mimax

Octodontomys gliroides

Chasichimys bonaerense

Chasicomys octodontiforme

Acarechimys leucotheae

Acarechimys minutus

Acaremyidae

Acaremys murinus

Galileomys antelucanus

Galileomys baios

Erethizontoidea

Steiromys detentus

Eosteiromys homogenidens

Dasyproctidae

Dasyprocta azarae

Node A

Eoviscaccia frassinettii

Eoviscaccia boliviana

Garridomys curunuquem

Incamys bolivianus

Asteromys bolivianus

Asteromys punctus

Cephalomyidae

Cephalomys ceciae

Cephalomyopsis hypselodontus

Litodontomys chubutensis

Cephalomys arcidens

Scotamys antiquus

Node B

Banderomys leanzai

Soriamys ganganensis

Soriamys gaimanensis

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Brain endocasts

Research on 30 million-year-old Incamys bolivianus virtual endocasts show they had expanded temporal lobes in the cerebrum and large caudal colliculi in the midbrain, arguing they had enhanced auditory acuity and vocalization. This is consistent with them living in social groups and using calls to communicate with each other, similar to modern chinchillas.[3]

References

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