At least half of the cnidarian fauna of the Nile basin (7+ species) is suspected of being of allochtonous origin. In addition, species that are native (Limnocnida sp., Hydra spp.) have been poorly studied and seem to lack basin ende-mism. The introduced species (two of Pontocaspian and two of marine origin) are either salt-loving or tolerant of broad fluctuations in salinity. Yet, rapid changes in the lower Nile area in recent decades have secondarily eliminated three of them.
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Dumont, H.J. (2009). The Cnidaria of the Nile Basin. In: Dumont, H.J. (eds) The Nile. Monographiae Biologicae, vol 89. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9726-3_24
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