The freshwater limestone deposits at Black Crow, Namibia, have yielded a low diversity of aquatic and aquaphile vertebrates comprising three species of fishes, one frog and a crocodile. As a fauna these vertebrates suggest that, at the time of deposition during the Late Ypresian or Early-Middle Lutetian, the area lay within a tropical to sub-tropical climatic regime, and that the water bodies were fresh, clear and well-oxygenated, contrasting with the hyper-arid conditions that prevail in the area today. One of the fishes, Hydrocynus, is exclusively African. Its Palaeogene distribution was wider than it's extant range, the five localities where it has been recorded occurring well outside its present-day range. The Black Crow occurrence of this genus is potentially the oldest known (if the deposits are Late Ypresian). Keywords: Ypresian/Lutetian, Namibia, Palaeobiogeography, Alestidae, Hydrocynus, Alestes, Cichlidae, Crocodylia, Pipidae.