Abstract
Fifteen specimens of Ancistrus cf. dubius of the Paraguay River Basin (Serra das Araras /Barra dos Bu- gres, Mato Grosso state, Brazil) were studied cytogenetically with characterization and of constitutive heterochroma- tin and nucleolar organizer regions (NORs) evidenced by C-bands, flurochrome GC-rich DA/CMA3 and silver- staining. For the first time, chromosomic heteromosphism related to sex, of the type ZZ/ZW, was observed in An- cistrinae fish. Thus, in the karyotype of males a pair of Z acrocentric chromosomes, represented by a single compo- nent in the females karyotypes, was verified. However, the latter presents an exclusive W acrocentric chromosome. The karyotype formula (18M+10SM+16ST/A in males and in females) and diploid number (2n=44), verified here increases the variation of the diploid chromosome number in Ancistrinae to 2n=44 to 2n=52. These results are dis- cussed in relation to karyotipic evolutionary tendencies for the Loricariidae family.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
