Atlantic jackknife clam
- kingdom: Animalia
- phylum: Mollusca
- class: Bivalvia
- order: Adapedonta
- family: Pharidae
- genus: Ensis
- species: Ensis directus
- Belgium
Egmond aan Zee
North Holland
Katwijk aan Zee
South Holland
Netherlands
Frösakull
Haverdal
Mellbystrand
Påarp
Halland
Vejbystrand
Skåne
Sweden
Milford
West Haven
Connecticut
Bourne
Provincetown
South Yarmouth
West Dennis
Massachusetts
Beaufort
North Carolina
Jamestown
Rhode Island
United States
Bredene