Guinea pig

Cavia is a genus in the subfamily Caviinae that contains the rodents commonly known as guinea pigs. The best-known species in this genus is the domestic guinea pig, Cavia porcellus, an important common household pet outside of South America.

Taxonomic controversy
Cavia is classified in order Rodentia, although there was a minority belief in the scientific community that evidence from mitochondrial DNA and proteins suggested the Hystricognathi might belong to a different evolutionary offshoot, and therefore a different order. If so, this would be an example of convergent evolution. Other scientists were critical of this hypothesis. This uncertainty is largely of historical interest, as abundant molecular genetic evidence now conclusively supports classification of Cavia as rodents. This evidence includes draft genome sequences of Cavia porcellus and several other rodents (available on-line ).

Species

 * Cavia anolaimae (often considered a synonym of C. porcellus) - Colombia
 * Cavia aperea – Brazilian guinea pig, widespread east of the Andes
 * Cavia fulgida – shiny guinea pig, eastern Brazil
 * Cavia guianae (often considered a synonym of ''C. porcellus) - Venezuela, Guyana, Brazil
 * Cavia intermedia – intermediate guinea pig, Moleques do Sul islands, Santa Catarina, Brazil, first described in 1999
 * Cavia magna – greater guinea pig, Uruguay, southeast Brazil
 * Cavia nana (often considered a synonym of C. tschudii)
 * Cavia porcellus – domestic guinea pig, wild ancestor unknown
 * Cavia tschudii – montane guinea pig, Peru south to northern Chile and northwest Argentina