Evolution and systematics

Today, Ctenomyidae has one living genus with 58 species and eight fossil genera. These numbers are highly variable, because description of new species and reconsideration of old ones continues. Genus Ctenomys exists from the lower Pleistocene, and Ctenomyidae is found from the upper Miocene. Among the Hystricognathi, Ctenomyidae is closely related to: Octodontidae (octodonts), Abrocomidae (chinchilla rat), and Myocastoridae (coypu). Ctenomys is the most specious group of living rodents.

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