Oecomys concolor

Karyotype: 2n = 60 and FN = 62. Autosomal complement: one large subtelocentric pair, one small metacentric pair, and 27 acrocentric pairs large to small decreasing in size. Sex chromosomes: X, a large submetacentric; Y, a medium subtelocentric (Gardner & Patton 1976, pp. 12, Fig. 5C). Baker et al. (1983) also reported a diploid number of 2n = 58 and 2n = 60 for O. concolor, and performed the G-banding of these karyotypes. The karyotype of O. concolor reported by Gardner & Patton (1976) was very similar to that presented for O. catherinae . However, systematic works of the genus (Gomes-Júnior et al. 2016; Suárez-Villota et al. 2017) recognized this karyotype as belonging to O. concolor .