Rock louse
- kingdom: Animalia
- phylum: Arthropoda
- class: Malacostraca
- order: Isopoda
- family: Ligiidae
- genus: Ligia
- species: Ligia pallasii
Ucluelet
British Columbia
Canada
Dutch Harbor- Unalaska
- Wrangell
Alaska- Santa Cruz
- Twin Lakes
California- Port Townsend
Washington
United States