Four species of Hyolithes Eichwald from the Lower Permian are described and figured: Hyolithes amosi Gonzalez and Sabattini, Hyolithes sp. 1, Hyolithes sp. 2 from the Tuberculatella Zone and Hyolithes sp. 3 from the Neochonetes Zone. The genus Hyolithes is known from other austral and boreal areas but the Hyolitha species from the Tepuel-Genoa Basin are endemic.