Dear Jorge,
 
At the moment I don't know this species. But genus Folinia is
a Pyramidellidae and Alvania and Alvinia are Rissoidae.
This is what I can answer in the moment.
Helmut from Innsbruck
 
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> Dear L-conch friends
>
>
> Somebody have information about Folinia costata ?
>
> Folinia costata is the same species that Alvania costata ?
>
> It is a rissoid ?
>
> Other data (localization, size, etc ?)
>
> Do you know a web site where i can find information about micro-molluscs
> ? (piramidella, rissoina, rissoida, truncatella, vitrinella, etc.)
>
>
> Have a good day (afternoon or  night) all of you.
>
> Jorge Mendez
> Mexico City
>