The Common Cannibal Snail, family Rhytididae.
This large snail is not all that common, being endemic to our province, KwaZulu-Natal.
It is recognised by its large size, the marked umbilicus and the feelers, the lower of which are modified with an extension that are used to track prey.
Cannibal: because it is carnivorous, feeding on a mixed diet that includes other snails, including possibly its own species.
At bottom feeding on an Agate Snail, possibly a previous prey, but now using the shell as a source of calcium.
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