The Mauritanian gerbil (Gerbillus mauritaniae) is distributed mainly in northern Mauritania. Some authorities place it in a separate genus, Monodia. It is also sometimes considered a subspecies of the Sudan gerbil.
References
Schlitter. Granjon. amp. 2004. Gerbillus mauritaniae. 12 May 2006. Database entry includes a brief justification of why this species is listed as data deficient