Melanomys chrysomelas

Karyotype: 2n = 56 and FN = 58. Autosomal complement: two small metacentric pairs, and 25 acrocentric pairs (one conspicuously large and 24 medium to small decreasing in size). Sex chromosomes: X, a large subtelocentric (the largest chromosome of the complement); Y, a medium subtelocentric (Gardner & Patton 1976, pp. 10, Fig. 4B).