Zygodontomys brevicauda (= Z. b. cherriei)

The karyotypes of 2n = 82 and 2n = 84 were described by Gardner & Patton (1976), and Voss (1991), but in both cases the authors mention the karyotype without description or illustration of the chromosomes. Bonvicino et al. (2003, pp. 124, Fig. 2B) described a karyotype of 2n = 82 and FN = 116. Autosomal complement: 18 biarmed pairs (two large and 16 medium to small decreasing in size), and 22 medium to small acrocentric pairs decreasing in size. Sex chromosomes: X, a large submetacentric; Y, a small metacentric. These variation in diploid number occurs sympatrically on specimens collected in Zulia, state of Venezuela (Table 11, Fig. 22).