Karimi's fat-tailed mouse opossum (Thylamys karimii) is a species of opossum in the family Didelphidae.

[2] It is endemic to central and northeast Brazil, where it is found in the cerrado and caatinga at elevations from 300 to 1100 m.[1] This opossum is crepuscular and mostly terrestrial; its omnivorous diet includes leaves, insects and small vertebrates.

[3] The species is named after Iranian epidemiologist Y.

[4] It is threatened by habitat destruction and fragmentation due to agriculture and ranching.

This article about a marsupial is a stub.