western white slippersnail
- kingdom: Animalia
- phylum: Mollusca
- class: Gastropoda
- order: Littorinimorpha
- family: Calyptraeidae
- genus: Crepidula
- species: Crepidula nummaria
Palos Verdes Estates- San Diego
California- Bandon
Oregon- Port Ludlow
Washington
United States