Re-description of genitalia of Stephacharopa and description of a new Peruvian genus (Gastropoda, Stylommatophora, Charopidae)

The genital apparatus of Stephacharopa testalba is re-described from Argentinian specimens and recorded in Chile for the first time. Stephadiscus madrediosensis, a species currently restricted to the Peruvian Amazon, is transferred to the newly established genus Perucharopa based on differences of morphology, dimensions and structure of their embryonic and adult shells in comparison with South American charopids.