The montane Atlantic Forest rat (''Delomys collinus'') is a South American rodent species of the family Cricetidae. It is endemic to part of the

Atlantic Forest The Atlantic Forest ( pt, Mata Atlântica) is a South American forest that extends along the Atlantic coast of Brazil from Rio Grande do Norte state in the northeast to Rio Grande do Sul state in the south and inland as far as Paraguay and th ...

region of southeastern Brazil, where it is found at elevations from 1000 to 2700 m in noncontiguous mountain ranges. Its

karyotype A karyotype is the general appearance of the complete set of metaphase chromosomes in the cells of a species or in an individual organism, mainly including their sizes, numbers, and shapes. Karyotyping is the process by which a karyotype is disce ...

, like that of closely related '' Delomys dorsalis'', has 2n = 82, but the fundamental numbers of the two species differ. While it is not thought to be in present danger of extinction, habitat destruction and grassland fires are considered to be threats.

References

Delomys Mammals of Brazil Endemic fauna of Brazil Mammals described in 1917 Taxa named by Oldfield Thomas {{Cricetidae-stub