Winsoria is a genus of land planarian belonging to the family Geoplaninae.

Additionally, it is distinguished by the presence of a protrusible penis and a long ovovitelline duct.

Additionally, the species lacks a glandular margin and has a cylindrical pharynx.

[2] The generic name of Winsoria was given in honor of turbellariologist Leigh Winsor, "for his immense contribution to the systematics, biogeography and functional anatomy of land flatworms".

The specific epithet is derived from the Latin bi and patria, meaning "two countries", in reference to the species being found in both Argentina and Brazil.