Macrocallista williamsoni
- kingdom: Animalia
- phylum: Mollusca
- class: Bivalvia
- order: Venerida
- family: Veneridae
- genus: Macrocallista
- species: Macrocallista williamsoni
Mercer Island- Tukwila
Washington
United States
Macrocallista williamsoni Mercer Island Tukwila