Tortaguttus stiloensis, a new species of benthic unilocular foraminifera of the suborder Lagenina, is described from Middle Pleistocene marine sediments of Calabria, Italy. This species is characterized by radiating elevated costae on the surface of a double marginal carinae connected by numerous cross-struts. Previously known occurrences of Tortaguttus are restricted to the Pacific rim. However, the occurrence of Tortaguttus stiloensis in the Mediteranean region indicates that this genus is cosmopolitan in neritic-depth waters. The widespread distribution of species referable to Tortaguttus so soon after its appearance in the Quaternary indicates either a highly efficient dispersal mechanism or that the genus has a much longer and yet unrecorded fossil record.