Trachelyopterus coriaceus

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

Trachelyopterus coriaceus :

Araguaia River basin. Diploid number was 58 chromosomes and karyotype was composed of 20 metacentric, 18 submetacentric, 12 subtelocentric, and 8 acrocentric ( Fig. 1C ). AgNO 3 staining revealed simple NORs allocated in terminal region on the short arm of the submetacentric chromosome pair 23 ( Fig. 1C , in box). C-banding evidenced pale heterochromatin in terminal regions on almost all karyotype pairs ( Fig. 1F ). 18S rDNA-FISH also revealed only the pair 23 with these sites, corresponding to what was evidenced by the AgNO 3. 5S rDNA-FISH probe detected these sites on the short arm of the metacentric pair 3 and on the long arm of the submetacentric pair 16 ( Fig. 1I ).

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).