Vallonia sonorana Pilsbry, 1915 Vallonia gracilicosta, common name the multirib vallonia or multiribbed vallonia, is a species of very small, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Valloniidae.

[1] The subspecies, Vallonia gracilicosta albula, is an endangered species in the U.S. State of Michigan.

[2] This species occurs in:

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