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