Three new species of Spiralix (Burgosia) (Gastropoda, Moitessieriidae) from the northern Iberian Peninsula

The species of the genus Spiralix, considered in the subgenus Burgosia from the north of the Iberian Peninsula are analysed, with the description of three new species; these are compared with the type species of the genus and those geographically closer species. The differential characters are described and shown, among them the microsculpture of the protoconch.