Opisthostoma is a genus of minute land snails with opercula, terrestrial gastropod mollusks or micromollusks in the family Diplommatinidae.

Species in the genus Opisthostoma include:[1] Opisthostoma sensu stricto Plectostoma was treated as a subgenus of Opisthostoma.

In a 2014 revision, Plectostoma is treated as a separate genus.

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