| Armsia petasus | |
|---|---|
| Conservation status | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): | clade Heterobranchia
clade Euthyneura |
| Superfamily: | Cochlicopoidea |
| Family: | Amastridae |
| Genus: | Armsia |
| Species: | A. petasus |
| Binomial name | |
| Armsia petasus |
|
Armsia petasus is a species of small, air-breathing, land snail, a terrestrial pulmonate gastropod mollusk in the family Amastridae. This species is endemic to the United States.