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Divergent karyotypes in five genera of the African endemic fish family Distichodontidae (Cithariniformes, Osteichthyes).


ABSTRACT: The African family Distichodontidae comprises 109 species in 16 genera. Up-to-date cytogenetic information was available for the only distichodontid species Distichodusaffinis Günther, 1873. Here we report chromosome number and morphology in: Distichodusengycephalus Günther, 1864 (2n = 52, FN = 104), Ichthyborusbesse (Joannis, 1835) (2n = 46, FN = 92), Nannocharaxniloticus (Joannis, 1835) (2n = 54, FN = 106) and three taxa, Nannaethiopsbleheri Géry et Zarske, 2003, Nannaethiops sp., and Neolebiasunifasciatus Steindachner, 1894, that exhibit the same karyotypes (2n = 50, FN = 98). To confirm the Nannaethiops Günther, 1872 and Neolebias Steindachner, 1894 species identification, mt-DNA sequences of the two markers (COI and 16S rRNA) were obtained from karyotyped specimens and compared with the relevant sequences accessible from GenBank. The great prevalence of biarmed chromosomes (the karyotypes of most species contain exclusively biarmed chromosomes) is a distinctive characteristic of Distichodontidae and Cithariniformes as a whole.

SUBMITTER: Simanovsky SA 

PROVIDER: S-EPMC10636602 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature

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Divergent karyotypes in five genera of the African endemic fish family Distichodontidae (Cithariniformes, Osteichthyes).

Simanovsky Sergey A SA   Medvedev Dmitry A DA   Tefera Fekadu F   Golubtsov Alexander S AS  

Comparative cytogenetics 20231102


The African family Distichodontidae comprises 109 species in 16 genera. Up-to-date cytogenetic information was available for the only distichodontid species <i>Distichodusaffinis</i> Günther, 1873. Here we report chromosome number and morphology in: <i>Distichodusengycephalus</i> Günther, 1864 (2n = 52, FN = 104), <i>Ichthyborusbesse</i> (Joannis, 1835) (2n = 46, FN = 92), <i>Nannocharaxniloticus</i> (Joannis, 1835) (2n = 54, FN = 106) and three taxa, <i>Nannaethiopsbleheri</i> Géry et Zarske, 2  ...[more]

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