Ctenomys haigi Thomas, 1917 . Ann. Mag. Nat. Hist., ser. 9, 3:210.

TYPE LOCALITY: Argentina, Chubut Prov., El Maitén, 700 m .

DISTRIBUTION: Chubut and Rio Negro Prov., Argentina.

SYNONYMS: lentulus, maulinus .

COMMENTS: Was combined with mendocinus, but Pearson (1984:231) elevated to a species based on its unique karyotype. The chromosome no. is 2n=50.