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: 36

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.4566568

persistent identifier

http://treatment.plazi.org/id/03A587ED-321C-FFF1-83E9-F9642FE5FF3E

treatment provided by

Plazi

scientific name

Neacomys
status

 

Neacomys   sp. 1

Karyotype: 2n = 48 and FN = 54. Autosomal complement: four small metacentric and submetacentric pairs, and 19 acrocentric pairs (one large and the remaining medium to small decreasing in size). Sex chromosomes: X, a medium subtelocentric; Y, a small acrocentric ( Fig. 9A View FIGURE 9 ). 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 was almost entirely heterochromatic ( Fig. 9B View FIGURE 9 ). G-banding was performed to allow the correct identification of all homologous pairs ( Fig. 9C View FIGURE 9 ). FISH with telomeric sequences revealed signals exclusively at the ends of all chromosome arms and no interstitial signals were observed ( Fig. 9D View FIGURE 9 ). This karyotype seems to be the same reported by Sánchez-Vendizú et al. (2018) for N. rosalindae   . However, these authors appar-ently misclassified two small metacentric pairs as acrocentric. Also, the X chromosome seems to present two different morphologies, a medium submetacentric or subtelocentric. A morphological and molecular analyses of the specimens referred as Neacomys   sp. 1 is necessary to test this hypothesis.

Kingdom

Animalia

Phylum

Chordata

Class

Mammalia

Order

Rodentia

Family

Muridae