Oligoryzomys utiaritensis

Karyotype: 2n = 72 and FN = 76. Autosomal complement: three small metacentric and submetacentric pairs, and 32 acrocentric pairs (three large and the remaining medium to small decreasing in size). Sex chromosomes: X, a large submetacentric; Y, a small submetacentric (Agrellos et al. 2012, pp. 9, Fig. 5A).