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Incamys bolivianus was a caviomorph rodent representing an early member of the chinchillid family, with its closest modern relatives being chinchillas and viscachas.
Living in what is now Bolivia and Argentina during the late Oligocene about 27 million years ago, it inhabited an arid open grassland at a time when the area's climate had drastically cooled due to the formation of the Antarctic Circumpolar Current.
It's estimated to have been similar in size to a large modern chinchilla – weighing around 700g (~1lb 8oz) and measuring about 25-30cm long not including the tail (~10-12").
An endocast of the shape of its brain from a near-complete fossil skull shows that it had a well-developed sense of hearing, particularly in vocalization processing, suggesting it may have been a social animal living in groups communicating with complex calls similar to modern chinchillids. It was probably a ground-dweller less agile than its modern relatives, but still capable of fast movements.
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References:
Bertrand, Ornella C., et al. "The virtual brain endocast of Incamys bolivianus: insight from the neurosensory system into the adaptive radiation of South American rodents." Papers in Palaeontology 10.3 (2024): e1562. https://doi.org/10.1002/spp2.1562
Rasia, Luciano L., Adriana M. Candela, and Carola Cañón. "Comprehensive total evidence phylogeny of chinchillids (Rodentia, Caviomorpha): Cheek teeth anatomy and evolution." Journal of Anatomy 239.2 (2021): 405-423. https://doi.org/10.1111/joa.13430
Wikipedia contributors. “Agua de la Piedra Formation” Wikipedia, 06 Jan. 2025, https://en.wikipedia.org/wiki/Agua_de_la_Piedra_Formation
Wikipedia contributors. “Incamys” Wikipedia, 19 Jan. 2025, https://en.wikipedia.org/wiki/Incamys
So last night at 1am, Steve decided to jump in and take a bath. Well baths make him hyper and brave, you see. So he decided to try breaking our play space barrier. He succeeded and then got in the guinea pig cage. Once he found out the little cavies would groom him he would do anything to get back in there again. It took me almost two hours to get him put away in his room! Anyway, capybaras are trouble, and I'm very excited that we may be able to break ground on the facility this month if all goes well! #guineapig #capybara #caviomorpha https://www.instagram.com/p/B9hySd5pbIT/?igshid=g06s1cvwx87f
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The best evidence we have suggests that, while Caviomorpha originated in South America, they came from ancestors in Africa, over 40 million years ago. So how did they get there?