摘要："Two species of the echimyid rodent genus Isothrix are recognized within the Amazon and upper Orinoco basins of South America based on color and color pattern, bacular morphology, cranial morphometrics, and karyotype. These represent significant departures in the previously recognized name combinations: I. bistriata Wagner, with two geographic races (bistriata (including villosa Deville, negrensis Thomas, molliae Thomas, and boliviensis Petter and Cuenca Aguirre) and orinoci Thomas), and I. pagurus Wagner. No localities of sympatric contact between these two species are known, although their ranges come very close in the general vicinity of Manaus in central Brazil"--P. [1].
