Incamys is an extinct genus of chinchillid rodent that lived during the Late Oligocene (Deseadan) in what is now South America.

[2] Research on endocasts suggest they were group living using call communication like modern chinchillas.

In 2015, Vucetich and colleagues described a new species of Incamys, I. menniorum, from the Sarmiento Formation of Chubut Province, Argentina.

[6] Bugtimys zafarullahi Phiomys andrewsi Metaphiomys schaubi Prospaniomys priscus Myocastor coypus Proechimys polioplus Eumysops laeviplicatus Kannabaetomys amblyonyx Echimys chrysurus Ctenomys australis Plataeomys brevis Pithanotomys columnaris Octomys mimax Octodontomys gliroides Chasichimys bonaerense Chasicomys octodontiforme Acarechimys leucotheae Acarechimys minutus Acaremys murinus Galileomys antelucanus Galileomys baios Steiromys detentus Eosteiromys homogenidens Dasyprocta azarae Eoviscaccia frassinettii Eoviscaccia boliviana Garridomys curunuquem Incamys bolivianus Asteromys bolivianus Asteromys punctus Cephalomys ceciae Cephalomyopsis hypselodontus Litodontomys chubutensis Cephalomys arcidens Scotamys antiquus Perimys intermedius Lagostomus maximus Lagidium viscacia Chinchilla chinchilla Banderomys leanzai Soriamys ganganensis Soriamys gaimanensis Luantus propheticus Guiomys unica Microcavia australis Cavia aperea Galea musteloides Dolichotis patagonum 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.