18S rDNA also present on chromosome pairs 26, 27, 28, 29. The 5S rDNA present on interstitial position in chromosome pair 1 (m). Telomeric sequences (TTAGGG)n evidenced in terminal portions of all chromosomes.
Karyological information
Geographical area of study
Uatumã River, Brazil.
Source of chromosomes
Kidney.
Number of specimens with sex
21 (10 male, 11 female)
Diploid chromosome number
62
Karyotype formula
24m+28sm+4st+6a
Fundamental arm number
118
Chromosome length
Sex chromosome
No heteromorphic sex-chromosome found.
Chromosome staining/banding/FISH
AgNORs found on chromosome pairs 26, 27, 28, 29. Interstitial heterochromatic markings evidenced in long arms of pairs 1, 4, 5 (m), 19 (sm), in short arms of pair 13 (m), and were only centromeric in pairs 10, 11 and 12 (m) and 21 (sm). AgNORs were all C-band positive and located in the terminal portions of the chromosomes.
Reference
dos Santos AG, de Sousa e Souza JF, Soares SC, Nakayama CM, Feldberg E (2023). Chromosomal characterization of three species of Serrasalmini (Serrasalmidae: Characiformes). Genetics and Molecular Biology, 46, 4, e20230088.