oa Annals of the Natal Museum - A review of the freshwater Mollusca of Natal and their distribution

Volume 18, Issue 3
  • ISSN : 0304-0798



Sixty species of freshwater Mollusca occurring in Natal are listed with summaries of their distribution there and elsewhere in Africa; 10 of these are recorded from Natal for the first time. A group of species with a wide tropical range is dominant in north-eastern Natal; some of these species extend southwards over a subtraction zone. The pattern of distribution of the tropical snails supports the idea that their occurrence is largely governed by direct temperature effects. Tropical forms living unusually far south occur in isolated populations. There are also some species in Natal characteristic of temperate parts of southern Africa, as well as ubiquitous species. The occurrence in the continents of the southern hemisphere of mutelid mussels and Ferrissia (Pettancylus) seems explicable by a northern origin.

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