The Sigmoid Prominent is a small, beautifully patterned prominent moth with brown-and-white wings bearing a distinctive S-shaped dark marking — the sigmoid that gives it its name. It is associated with poplars and aspens. Adults rest with the body arched and wings raised at the front, the characteristic 'prominent' posture.
Best time to see a Sigmoid Prominent
The best time to see a Sigmoid Prominent is March–July, when about 64% of U.S. sightings happen, based on 893 research-grade iNaturalist observations.
Not certain it is a Sigmoid Prominent? What bug is this? walks through what to check first and the lookalikes that catch people out.
Recent Sigmoid Prominent sightings near you
Live, research-grade observations from iNaturalist. Allow location to center the map on you.
Spotted a Sigmoid Prominent?
Point Huck at any plant, bird, or animal and know for sure - plus a live map of where it is being spotted near you.