Seashells; How Many? How Big?

Here are a few interesting facts about the world’s seashells:

How many different kinds of seashells are there?
There are somewhere between 50,000 and 200,000, species of mollusks which have a shell. The exact number depending on who’s counting. These figures are based on the number of species that have been described, which of those are accepted as valid, plus the estimates of undiscovered species remaining on earth.

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