California horsemussel
- kingdom: Animalia
- phylum: Mollusca
- class: Bivalvia
- order: Mytilida
- family: Mytilidae
- genus: Modiolus
- species: Modiolus carpenteri
Belvedere- Carmel-by-the-Sea
- Del Monte Forest
- Lomita
- Sausalito
- Tiburon
California
United States