Aydin,

The introductory section of World Register of Marine Species gives some data on the number of marine species; about 213,000 as I recall.
google WoRMS to check it out

Jim Brunner

On Mar 20, 2013, at 9:51 AM, aydin <[log in to unmask]> wrote:

> Could the good folks on CONCH-L direct me to some literature that gives the
> approximate number of the extant shelled gastropod species (excluding slugs)?
>
> Many thanks.
>
> Aydin Orstan
>
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