Parauchenipterus striatulus

Santos, Dayane Petik dos, Felicetti, Denise, Baumgärtner, Lucas, Margarido, Vladimir Pavan, Blanco, Daniel Rodrigues, Moreira-Filho, Orlando & Lui, Roberto Laridondo, 2021, Contributions to the taxonomy of Trachelyopterus (Siluriformes): comparative cytogenetic analysis in three species of Auchenipteridae, Neotropical Ichthyology (e 200115) 19 (1), pp. 1-12 : 5

Parauchenipterus striatulus :

Doce River basin. Diploid number (2n) was 58 chromosomes and the karyotype was composed of 18 metacentric, 20 submetacentric, 10 subtelocentric, and 10 acrocentric chromosomes ( Fig. 1A ). AgNO 3 staining demonstrated simple NORs allocated in terminal region on the short arm of the submetacentric pair 23 ( Fig. 1A , in box). C-banding technique evidenced pale heterochromatin in terminal regions of almost all chromosome pairs ( Fig. 1D ). 18S rDNA-FISH confirmed previous findings by AgNO 3 staining and revealed these sequences only on pair 23. 5S rDNA-FISH detected these sequences in three submetacentric pairs, on the short arm of the pair 10 and 13, and on the long arm of the pair 15 ( Fig. 1G ).

Figures

FIGURE 1 | Karyotypes of A. Parauchenipterus striatulus, B. Parauchenipterus galeatus and C. Trachelyopterus coriaceus. Giemsa stained karyotypes. The chromosome pairs marked with silver nitrate are in the boxes; D, E, F. C-banding sequentially karyotypes; G, H, I. Karyotypes hybridized with 5S rDNA and 18S rDNA probes. G. rDNA probe 18S (rhodamine, red signal), 5S rDNA probe (FITC, green signal). H, I. rDNA probe 18S (FITC, green signal), 5S rDNA probe (rhodamine, red signal).