Caplin Rous Capybara

Its karyotype has 2n = 66 and FN = 102.
Fossil record and other species
A larger capybara called Neochoerus pinckneyi once existed in North America, having invaded that continent during the Great American Interchange that followed formation of the Isthmus of Panama. Other fossil caviomorphs that were eight times the size of modern capybaras have been called "capybaras" by the popular press, but were actually dinomyids related to the pacarana.