Harmothoe extenuata
- kingdom: Animalia
- phylum: Annelida
- class: Polychaeta
- order: Phyllodocida
- family: Polynoidae
- genus: Harmothoe
- species: Harmothoe extenuata
- France
- Marin City
- Sausalito
- Strawberry
California- Branford
- Branford Center
- Milford
Connecticut- Newport
Rhode Island
United States