Neacomys minutus

Karyotype: 2n = 35–36 and FN = 40. Autosomal complement: three small metacentric pairs, and 14 acrocentric pairs (three large, one medium, and the remaining small decreasing in size). The medium-sized element was apparently involved in a Robertsonian polymorphism, with heterozygous individuals found at two different localities, all others localities were homozygous for the acrocentric condition (Table 6, Fig. 7). Sex chromosomes: X, a mediumsmall metacentric; Y, a small acrocentric (Patton et al. 2000, pp. 110, Fig. 75B).