Opisthostoma vermiculum is a species of small land snail with an operculum, a terrestrial gastropod mollusk or micromollusk in the family Diplommatinidae.

[1][2] When the species was discovered, thirty-eight specimens were collected: the shell shapes showed low variation.

The detached whorls coil around three secondary axes in addition to their primary teleoconch axis.

There is significant quarring activities in the area, and this makes the species particularly vulnerable to extinction.

The specific epithet, vermiculum, is derived from Latin, "meaning "wormy".