Premise: Abrothrix longipilis, also known as the long-haired grass mouse or long-haired akodont, is a species of rodent in the family Cricetidae. It is found in central and southern Argentina and Chile. The southern Chilean "Abrothrix sanborni" may not be distinct from this species.
Hypothesis: The "Abrothrix longipilis" and the 'Abrothrix samborni" are related species