Angustopila psammion is a species of land snail belonging to the subfamily Hypselostomatinae of the family Gastrocoptidae.

[1] This species was discovered by scientists scrutinising a small pothole-like cave located in northern Vietnam, according to the original description published in Contributions to Zoology.

[2] According to National Geographic, this is the smallest species of land snail ever found.

[3][4] In comparison to other land snails in its family, the Angustopila psammion has a smaller parietal tooth and a shorter spire, however it has a much wider umbilicus.

[5] "Psammion (ψαμμιών)" derives from the ancient Greek word for "grain of sand.