Thylamys pusilla (Desmarest, 1804) . Tabi. Méth. Hist. Nat., in Nouv. Diet. Hist. Nat., 24:19.

TYPE LOCALITY: Not stated; restricted to Paraguay, Misiones, "San Ignacio," by Tate (1933) .

DISTRIBUTION: C and S Brazil, Paraguay, SE Bolivia, and N Argentina.

SYNONYMS: citella Thomas, 1912; karimii Petter, 1968; marmota Thomas, 1902; nana Olfers, 1818; verax Thomas, 1921.