Karyology of the redfin minnows, genus Pseudobarbus Smith, 1841 (Teleostei: Cyprinidae): one of the evolutionarily tetraploid lineages of South African barbines

Naran, D. and Skelton, P.H. and Villet, M.H. (2006) Karyology of the redfin minnows, genus Pseudobarbus Smith, 1841 (Teleostei: Cyprinidae): one of the evolutionarily tetraploid lineages of South African barbines. African Zoology, 41 (2). pp. 178-182. ISSN 1562-7020

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Abstract

The karyotypes of six species of Pseudobarbus Smith, 1841, namely P. afer (Peters, 1864), P. asper (Boulenger, 1911), P. burchelli Smith, 1841, P. burgi (Boulenger, 1911), P. phlegethon (Barnard, 1938) and P. tenuis (Barnard, 1938), were examined by conventional Giemsa staining and described. All six karyotypes have 2n = 100 chromosomes, dominated by biarmed chromosomes, as does the only other member of the genus, P. quathlambae (Barnard, 1938). Sex-related intraspecific karyotype variation was not found. The shared chromosome numbers and general similarity of the karyotypes (FN = 186–192) provide a new synapomorphy to support their monophyly, which is already indicated by anatomical and mtDNA markers. Karyotype evolution within the genus has been accompanied by chromosomal inversions and centromeric shifts. Comparison of the diploid number found in Pseudobarbus with other African barbine cyprinines, which have in the region of 2n=50 and lower FNs, suggests a tetraploid evolutionary origin of the genus, possibly by allotetraploidy.

Item Type:Article
Uncontrolled Keywords:Barbinae; Cytogenetics; Karyotype; Pseudobarbus; Tetraploidy
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Ichthyology & Fisheries Science
Faculty > Faculty of Science > Zoology & Entomology
Research Institutes and Units > South African Institute for Aquatic Biodiversity (SAIAB)
ID Code:837
Deposited By:INVALID USER
Deposited On:05 Nov 2007
Last Modified:06 Jan 2012 16:19
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