Euryoryzomys emmonsae

Euryoryzomys emmonsae

Karyotype: 2n = 80 and FN = 86. Autosomal complement: four small metacentric and submetacentric pairs, and 35 acrocentric pairs (one distinctly large and the remaining large to small decreasing in size). Sex chromosomes: X, a very large subtelocentric; Y, a small acrocentric (Musser et al. 1998, pp. 237, Fig. 109). According to Musser et al. (1998), some acrocentric autosomes have short second arms and could be classed as biarmed, but the FN was based on classifying them as uniarmed chromosomes (if these pairs were classified as biarmed, the FN of this species would be 90, but this review considers the FN = 86).