As traditionally defined, its range extends from southern Mexico to northern Argentina, but this includes several distinctive population that have since been split into separate species.Under this narrower definition, the true common tapeti only occurs in the Atlantic Rainforest of coastal northeastern Brazil and it is classified as "Endangered" by the IUCN.[2] The American Society of Mammalogists concurs, but also tentatively classifies several distinct populations that have not yet received proper species names into S. brasiliensis, and thus considers it to range from Venezuela south to Argentina.[2] Consequently, recent authorities have recommended splitting off several taxa typically considered subspecies of the tapeti and recognizing them as separate species: S. andinus in the Andean highlands of Ecuador (perhaps also in the Andes of Colombia, Venezuela and northern Peru),[7] S. gabbi (with subspecies truei) from Panama to Mexico,[9] S. sanctaemartae in the lowlands of northern Colombia,[8] and S. tapetillus from coastal southeastern Brazil.[12] Like its California relative, the brush rabbit (Sylvilagus bachmani), the common tapeti is a natural reservoir for the myxoma virus.