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

Volume 41, Issue 2
  • ISSN : 1562-7020
  • E-ISSN: 2224-073X
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The karyotypes of six species of &lt;I&gt;Pseudobarbus&lt;/I&gt; Smith, 1841, namely <I>P. afer&lt;/I&gt; (Peters, 1864), <I>P. asper&lt;/I&gt; (Boulenger, 1911), <I>P. burchelli&lt;/I&gt; Smith, 1841, <I>P. burgi&lt;/I&gt; (Boulenger, 1911), <I>P. phlegethon&lt;/I&gt; (Barnard, 1938) and <I>P. tenuis&lt;/I&gt; (Barnard, 1938), were examined by conventional Giemsa staining and described. All six karyotypes have 2&lt;I&gt;n&lt;/I&gt; = 100 chromosomes, dominated by biarmed chromosomes, as does the only other member of the genus, <I>P. quathlambae&lt;/I&gt; (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 &lt;I&gt;Pseudobarbus&lt;/I&gt; with other African barbine cyprinines, which have in the region of 2<I>n</I>=50 and lower FNs, suggests a tetraploid evolutionary origin of the genus, possibly by allotetraploidy.

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