Bug FAQOregon pillbug
Gnorimosphaeroma oregonense · Order: Isopoda · Family: Sphaeromatidae
The Oregon pillbug is an oval creature about 6 mm long and roughly twice as long as it is wide. It lives in tidal pools and the intertidal zone along the mid-California to Alaskan coast, down to depths of about 24 m. Its native range is the Pacific coast of North America from mid-California up to Alaska.
Source: Wikipedia
Size
Adults are about 6 mm long and about twice as long as they are wide.
Source: Wikipedia
Where it comes from
Its primary range is the Pacific coast from mid-California to Alaska.
Source: Wikipedia
Where it is found in the US
Recorded in 5 of 51 states and DC. Most records: Washington, Alaska, California, Oregon, Hawaii.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in Canada. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
Where does the Oregon pillbug live?
It lives in tidal pools and the intertidal zone along the mid-California to Alaskan coast, down to about 24 m deep.
Source: Wikipedia
How big is an Oregon pillbug?
It is about 6 mm long and roughly twice as long as it is wide.
Source: Wikipedia
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Gnorimosphaeroma_oregonense
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-26 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-26.