Karyology of three evolutionarily hexaploid southern African species of yellowfish, Labeobarbus Rüppel, 1836 (Cyprinidae)

Naran, D. and Skelton, P.H. and Villet, M.H. (2007) Karyology of three evolutionarily hexaploid southern African species of yellowfish, Labeobarbus Rüppel, 1836 (Cyprinidae). African Zoology, 42 (2). pp. 254-260. ISSN 1562-7020

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Abstract

The karyotypes of three species of yellowfish, namely Labeobarbus marequensis (A. Smith, 1841), L. capensis (A. Smith, 1841) and L. polylepis (Boulenger, 1907), were examined by Giemsa staining using an approach improved for the description of high chromosome numbers. In each case, 2n = 150; no heteromorphic chromosomes were detected; chromosomes in all morphological categories ranged smoothly from large to small, with no distinctly large submetacentric pairs; and metacentric chromosomes showed little variation in size. Labeobarbus marequensis had 26 metacentric (m), 44 submetacentric (sm), 42 subtelocentric (st) and 38 acrocentric (a) chromosomes and a fundamental number (FN) of 262; L. capensis had 16 m, 58 sm, 42 st and 34 a chromosomes and FN = 266; and L. polylepis had 18 m, 60 sm, 42 st and 30 a chromosomes and FN = 270. These results, combined with published literature, imply that Labeobarbus Rüppel, 1836 is an evolutionarily hexaploid African lineage and support its removal from synonymy with the evolutionarily tetraploid Asian genus Tor Gray, 1834. A review of fundamental numbers for conspecific Labeobarbus species examined in different studies implicated karyological technique as a confounding factor in assessing details of karyotypes, leading to recommendations for future karyological studies of barbine fishes. Potential synapomorphies are pointed out in karyological characters of species within Labeobarbus.

Item Type:Article
Uncontrolled Keywords:Pisces, Barbinae, cytogenetics, hexaploidy, taxonomy, phylogenetics, Southern Africa, yellowfish, evolution,
Subjects:Q Science > QH Natural history > QH426 Genetics
Q Science > QL Zoology > Chordates. Vertebrates > Fishes
Divisions:Faculty > Faculty of Science > Zoology & Entomology
ID Code:1941
Deposited By: Prof Martin Villet
Deposited On:04 Jun 2012 07:06
Last Modified:04 Jun 2012 07:06
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