Microryzomys altissimus (Osgood, 1933)

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 : 30

Microryzomys altissimus

Karyotype: 2n = 57 and FN = 58 (fundamental number comprises the number of autosomal and sex chromosomes arms). Chromosomal complement: 27 acrocentric pairs large to small decreasing in size, and three unpaired elements consisting of one large subtelocentric, one large acrocentric, and one small acrocentric. Sex chromosomes was unknown as only a female was examined. This individual was apparently a heterozygous for an autosomal Robertsonian translocation ( Gardner & Patton 1976, pp. 10, Fig. 4A ).

Figures

FIGURE 4. Karyotype of Euryoryzomys sp., male with 2n = 58 and FN = 92. (A) Conventional staining (JAP 228); (B) C-banding (JAP 228); (C) G-banding (JAP 228); (D) Metaphase plate after fluorescent in situ hybridization with telomeric probe (left) and DAPI staining (right) (JAP 228), arrows indicate the hybridization of interstitial telomeric sequence.