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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Phreatic Catfish of the Genus Silvinichthys from Southern South America (Teleostei, Siluriformes, Trichomycteridae)

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Fernández, Luis ; Pinna, Mario C. C. de
Total Authors: 2
Document type: Journal article
Source: Copeia; n. 1, p. 100-108, Feb. 2005.
Field of knowledge: Biological Sciences - Genetics

The cytogenic analyses showed that P. mangurus has a diploid number of 2n=54 chromosomes (6M, 26SM, 12 ST and 10A), single Ag-NORs on the short arm of a middle-sized ST pair, identified as pair 19, and a very small amount of C-band positive segments in two chromosome pairs. The Ag-NORs are C-band positive. The staining of the chromosomes of P. mangurus with CMA3 reveled the occurrence of bright signals corresponding to the Ag-NORs segments, to the C-band positive segments and also to some C-band negative segments. The occurrence of a diploid number of 2n-54 in all species of the family Pseudopimelodidae and its absence among representatives of Pimelodidae and Heptapteridae, two previously considered related families, reinforces the hypothesis that Pseudopimelodidae is a monophyletic group. (AU)

FAPESP's process: 99/09781-6 - Morphology of the anterior vertebrae in Pristigasteroidea and its implications on the phylogenetic relatioships between Clupeomorpha and Ostariophysi (Osteichthyes, Teleostei)
Grantee:Mario Cesar Cardoso de Pinna
Support Opportunities: Research Projects - Thematic Grants