18S rDNA also present on chromosome pairs 26, 27, 28, 29, 30, 31. 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
Anavilhanas, Brazil.
Source of chromosomes
Kidney.
Number of specimens with sex
19 (9 male, 10 female)
Diploid chromosome number
62
Karyotype formula
22m+22sm+6st+12a
Fundamental arm number
112
Chromosome length
-
Sex chromosome
No heteromorphic sex-chromosome found.
Chromosome staining/banding/FISH
AgNORs found on chromosome pairs 26, 27, 28. Interstitial blocks appeared only in pair 1 (m), and pair 22 (sm) showed only centromeric marking and pair 27 showed centromeric and terminal marking in long arm, while other pairs have terminal marking, which is sometimes bitelomeric. AgNORs were all C-band positive and located in the terminal portions of 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.