Neacomys paracou

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: 34

publication ID

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

publication LSID

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

DOI

http://doi.org/10.5281/zenodo.4566540

persistent identifier

http://treatment.plazi.org/id/03A587ED-321E-FFF4-83E9-FF50296EFDA6

treatment provided by

Plazi

scientific name

Neacomys paracou
status

 

Neacomys paracou  

Karyotype: 2n = 56 and FN = 66. Autosomal complement: six metacentric and submetacentric pairs, and 21 acrocentric pairs. Sex chromosomes: X, a medium subtelocentric; Y, a small acrocentric. Another fundamental number of 62 was reported due to presence of two pericentric inversions ( Silva et al. 2015, pp. 4, Fig. A1 View FIGURE 1 and A 2 View FIGURE 2 ). This variation in fundamental number occurs in different localities of Pará, state of Brazil ( Silva et al. 2015). C-banding metaphases exhibited blocks of constitutive heterochromatin on the pericentromeric region of all autosomes. The X chromosome presented a pericentromeric heterochromatic block. The Y chromosome was almost entirely heterochromatic. G-banding was also performed. FISH with 18s rDNA sequences revealed signals of NORs on the short arm of five acrocentric pairs, and on the distal region of the long arm of a small acrocentric pair. FISH with telomeric sequences revealed signals exclusively at the ends of all chromosome arms and no interstitial signals were observed ( Silva et al. 2015). The same diploid number was presented by Voss et al. (2001). Another fundamental number of 64 was reported by Silva et al. (2019) due to the presence of one acrocentric pair instead of a biarmed pair. The authors also reported a different morphology for the X chromosome, a medium-sized acrocentric.

Kingdom

Animalia

Phylum

Chordata

Class

Mammalia

Order

Rodentia

Family

Muridae

Genus

Neacomys