Pearson's chaco mouse (Andalgalomys pearsoni) is a species of rodent in the family Cricetidae.

[2] This mouse is found in the Gran Chaco ecoregion of southeastern Bolivia and western Paraguay at elevations up to 400 m.[1] The species is named after American zoologist Oliver Payne Pearson.

[3][4] Its karyotype has 2n = 76 and 78 in the two subspecies.

[2] The latter is the highest diploid number of any species in the tribe Phyllotini.

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