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The recent increase in mammal inventories and the widespread use of pitfall traps as a major capture method in Brazil have increased the number of non-volant small mammal specimens in scientific collections, providing new information on natural history, geographical range, and taxonomic status of many marsupials and rodents. To date, however, little is known about the Brazilian species of the marsupial genus  Thylamys : the number of species in the country is disputed, as are their names and geographic distribution. Thus, the aim of this study was to define the Brazilian species of the genus, delimiting their taxonomic status and distributional range. We provide qualitative and quantitative data on external and skull morphology for specimens housed in scientific collections. A study of the material available allowed us to recognize the occurrence of three species in Brazil:  Thylamys karimii  (Petter, 1968),  T. macrurus  (Olfers, 1818) and  T. velutinus  (Wagner, 1842). For each of these we provide redescriptions, a discussion of local and geographic variations, geographic distribution, taxonomy, age class differentiation, sexual dimorphism, and natural history.

mammalia

Taxonomy and distribution of the Brazilian species of  Thylamys  (Didelphimorphia: Didelphidae) / La taxonomie et la distribution des espèces brésiliennes du genre  Thylamys  (Didelphimorphia: Didelphidae)