Dialysis dispar
- kingdom: Animalia
- phylum: Mollusca
- class: Bivalvia
- order: Myida
- family: Xylophagidae
- genus: Dialysis
- species: Dialysis dispar
- Agassiz
- Armstrong
- Oak Bay
- White Rock
British Columbia
Canada- Eureka
California- Corvallis
- Forest Grove
- Salem
Oregon- Fort Lewis
- Seattle
- Sumner
- Tenino
- Walla Walla
- Walla Walla East
Washington
United States