Amphinectomys Malygin, Aniskin, Isaev & Milishnikov 1994

Monotypic genus represented by A. savamis (Malygin, Aniskin, Isaev & Milishnikov 1994), known from only a few specimens collected in Ecuador and northeastern Peru, Departamento Loreto and Departamento Ucayali (in the Sierra del Divisor), near the Peruvian-Brazilian border (Malygin et al. 1994; Weksler & Valqui 2015; Chiquito & Percequillo 2016).

Karyotype: 2n = 50 and FN = 62.Autosomal complement: four submetacentric pairs (three large and one small), two small metacentric pairs, one small subtelocentric pair, and 17 acrocentric pairs (seven large to small and ten very small). Sex chromosomes: X, a metacentric (the largest chromosome of the complement); Y, a large metacentric (Malygin et al. 1994, Fig. 6I). C- and G-banding were also performed (Malygin et al. 1994; O’Brien et al. 2006, pp. 194).