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Alvania geryonia

Alvania geryonia is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.

Description
The length of the shell varies between 2.5 mm and 4 mm. ==Distribution==
Distribution
This species occurs in the Mediterranean Sea off Corsica, France, Tuscany, Italy and Greece; also in the Atlantic Ocean off the Azores. ==References==
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