Bug FAQEuthyatira semicircularis
Euthyatira semicircularis · Order: Lepidoptera · Family: Drepanidae
The adult moth has a wingspan of about 39 to 45 millimetres. It lives in coastal rainforests and boreal forests across western North America. Adults are active from May through July.
Source: Wikipedia
Size
The wingspan ranges from 39 to 45 mm.
Source: Wikipedia
Where it lives
It inhabits coastal rainforests and boreal forests.
Source: Wikipedia
When you see it
Adults are on the wing between May and July.
Source: Wikipedia
Where it comes from
It is found in North America, from British Columbia and California east to Utah.
Source: Wikipedia
Where it is found in the US
Recorded in 6 of 51 states and DC. Most records: Oregon, California, Montana, Washington, Idaho, Nevada.
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
Same family (Drepanidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Euthyatira_semicircularis
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-28 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-28.