Penile shape discriminates two cryptic species of Meyen, 1833 (Mammalia, Rodentia, Cricetidae) from eastern Brazil.

Glans penis morphology has been used as a powerful tool in mammal taxonomy to differentiate cryptic species. Neotropical rodent species and are cryptic, and interspecific hybrids are like their parental species. We investigated non-metric and metric phallic characters aiming to differentiate from .