Two new species of Geoplaninae, Pasipha backesi Leal-Zanchet, Rossi & Seitenfus, sp. nov. and P. brevilineata Leal-Zanchet, Rossi & Alvarenga, sp. nov., from southern Brazil are described herein. The two new sympatric species can be distinguished from each other by differences in colour pattern and the copulatory apparatus, especially regarding the prostatic vesicle. They show similar characteristics regarding the relative position of the ovaries and anteriormost testes in relation to body length, the position where ovovitelline ducts emerge from the ovaries, pharyngeal morphology and general morphology of the copulatory apparatus. Comments on the most important morphological characters of the 22 species originally assigned to the genus Pasipha are presented in order to highlight the heterogeneity of the genus as well as facilitate the comparative discussion of the new species. In addition, based on the current diagnosis of the genus, we propose the placement of G. cafusa into Pasipha.

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