Concave Lake Victoria Snail (Ceratophallus concavus)
The Concave Lake Victoria Snail was endemic to Lake Victoria and was apparently restricted there to a place named Hippo Bay near the city of Entebbe, Uganda; it inhabited shallow water, where it was found under stones, a habitat that it shared with other water snail species.
The shells reached sizes of about 0,12 x 0,32 cm; they are said to be reddish-brown and rather glossy. [1]
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References:
[1] Danish Bilharziasis Laboratory: A field guide to African freshwater snails. 2. East African species. 2nd edition. Danish Bilharziasis Laboratory, Charlottenlund. 1-51. 1987
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edited: 01.11.2020