Lagostomus maximus sunan kimiyya ne ga nau'in dabbobi masu shayarwa da aka fi sani da plain viscacha ko kuma babban bera na viscacha. Wani nau'in rodent ne wanda ya fito daga Kudancin Amirka, musamman Argentina, Bolivia, da Paraguay. Sunan "Lagostomus" ya fito ne daga kalmomin Helenanci "lagos," ma'anar kurege, da "stoma," ma'anar baki, yayin da "maximus" shine Latin don "mafi girma" ko "mafi girma." Saboda haka, Lagostomus maximus za a iya fassara shi zuwa nufin "manyan rodent-bakin kurege."