Megacardita hornii
- kingdom: Animalia
- phylum: Mollusca
- class: Bivalvia
- order: Carditida
- family: Carditidae
- genus: Megacardita
- species: Megacardita hornii
Mercer Island- Tukwila
Washington
United States
Megacardita hornii Mercer Island Tukwila