Caviomorpha

Caviomorpha is a rodent parvorder that unites all New World hystricognaths. Its classification within rodents is supported by fossil and molecular evidence, although it was once considered a separate order outside Rodentia. The group includes extinct giant hutias and Josephoartigasia monesi, as well as living groups such as guinea pigs, capybaras, chinchillas, agoutis, pacas, New World porcupines and coypu.

Taxonomic rank

Parvorder

Evidence

Fossil and molecular evidence

Largest known rodent

Josephoartigasia monesi (extinct)