Abstract
ALTHOUGH the swimbladder has been investigated thoroughly in the three Asian species of Notopterus1–3, it has not been described in the African species (N. afer) or in the monotypic African genus Xenomystus nigri. Authors have tacitly assumed that the swimbladder is similar in African and Asian members of the family, but this is not so. I have had occasion to examine the swimbladder in Notopterus afer and Xenomystus nigri, and I found several striking differences, both between the two genera and between N. afer and its Asian congeners.
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References
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Dehadrai, P. V., Proc. Zool. Soc., Lond., 139, 341 (1962).
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GREENWOOD, P. Swimbladder in African Notopterid Fishes. Nature 198, 1009–1010 (1963). https://doi.org/10.1038/1981009a0
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DOI: https://doi.org/10.1038/1981009a0
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