Neacomys, Thomas, 1900

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 : 37

publication ID

https://doi.org/ 10.11646/zootaxa.4876.1.1

publication LSID

lsid:zoobank.org:pub:190EC586-E14B-4AEF-A5EF-3DA401656159

DOI

https://doi.org/10.5281/zenodo.4566570

persistent identifier

https://treatment.plazi.org/id/03A587ED-321B-FFF1-83E9-FA312FCAF85C

treatment provided by

Plazi

scientific name

Neacomys
status

 

Neacomys sp. 2

Karyotype: 2n = 54 and FN = 62. Autosomal complement: five medium to small metacentric and submetacentric pairs, and 21 acrocentric pairs (one large and the remaining medium to small decreasing in size). Sex chromosomes: X, a medium subtelocentric; Y, a small submetacentric ( Fig. 10A View FIGURE 10 ). C-banding metaphases exhibited blocks of constitutive heterochromatin on the pericentromeric region of all autosomes. The X chromosome presented the short arm entirely heterochromatic. The Y chromosome presented the long arm entirely heterochromatic ( Fig. 10B View FIGURE 10 ). G-banding was performed to allow the correct identification of all homologous pairs ( Fig. 10C View FIGURE 10 ). FISH with telomeric sequences revealed signals exclusively at the ends of all chromosome arms and no interstitial signals were observed ( Fig. 10D View FIGURE 10 ). The same diploid number (2n=54) and a similar fundamental number (FN=66) was reported by Silva et al. (2017) for Neacomys sp. B. However, the former karyotype presented five large and two small biarmed pairs, different from the karyotype presented by us that comprises five medium to small biarmed pairs. The sex chromosomes morphology was also distinctly between the two karyotypes.

Kingdom

Animalia

Phylum

Chordata

Class

Mammalia

Order

Rodentia

Family

Muridae

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