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Freshwater Molluscan Shells (Site not responding. Last check: 2007-11-05) |
 | | Prior to the development of plate tectonic theory in the 1960s, various explanations were proposed, including land bridges, foundered beneath the waves long ago, or ancestral migrations to both areas from the north, with the fauna subsequently dying out in their native (norther hemnisphere) lands. |
 | | These are so different from freshwater snails elsewhere in Africa that "their relationship can only be traced through a careful study of their soft parts and anatomy, and is in some cases still open to question." (Pilsbry and Becquaert, 1927). |
 | | The importance of freshwater mollusks to humans and the environment is greater than their general absence in collections and popular guides would lead one to believe, although with increasing environmental awareness, and threats of extinction, this lately has started to change. |
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