Amphinectomys Malygin, Aniskin, Isaev & Milishnikov 1994

Moreira, Camila Do Nascimento, Ventura, Karen, Percequillo, Alexandre Reis & Yonenaga-Yassuda, Yatiyo, 2020, A review on the cytogenetics of the tribe Oryzomyini (Rodentia: Cricetidae: Sigmodontinae), with the description of new karyotypes, Zootaxa 4876 (1), pp. 1-111 : 7

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).

Figures

FIGURE 6. Distribution of diploid and fundamental number of karyotyped specimens of genus Hylaeamys. (□) H. megacephalus; (■) H. oniscus; (○) H. perenensis; (l) H. seuanezi; (ê) H. yunganus.