Nephelomys auriventer

Karyotype: 2n = 70 and FN = 84. Autosomal complement: eight medium to small metacentric and submetacentric pairs, and 26 acrocentric pairs large to small decreasing in size. However, if the largest autosomal pair was considered as a subtelocentric, the FN would be 86. Sex chromosomes: X, a medium metacentric; Y, a small submetacentric (Gardner & Patton 1976, pp. 4, Fig. 1D).