SeasonalityAdults fly from late July to early August.IdentificationAdult antennae are uniform chocolate-brown and the vertex of the head is dark chocolate. Spurs are dark brown. Segment 10 in males, is a massive lobe that is directed posterad past the extremity of the clasper (Nimmo, 1971).
Scientific NameRhyacophila narvaeHabitat
Varies from small, pebble-riffled creeks to large, turbulent rivers.
Seasonality
Adults fly from late July to early August.
Identification
Adult antennae are uniform chocolate-brown and the vertex of the head is dark chocolate. Spurs are dark brown. Segment 10 in males, is a massive lobe that is directed posterad past the extremity of the clasper…
Adult antennae are uniform chocolate-brown and the vertex of the head is dark chocolate. Spurs are dark brown. Segment 10 in males, is a massive lobe that is directed posterad past the extremity of the clasper (Nimmo, 1971).
Conservation
Uncommon.
Diet Info
Larvae are probably predacious.
Range
Holarctic. This species range extends from Alaska, south to California and Montana. In Alberta, records indicate that R. narvae is confined to the foothills and mountains (Nimmo, 1971).
Citation
Page Citation for Rhyacophila narvae
Page Citation
"Species Details - Rhyacophila narvae, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-3148. Accessed 13 Apr. 2025.
References
AuthorLaFontaine, Gary
TitleCaddisflies
Publication Date1981
Pages336
AuthorNimmo, A. P.
TitleThe adult Rhyacophilidae and Limnephilidae (Trichoptera) of Alberta and eastern British Columbia and their post-glacial origin.
Publication Date1971
Series TitleQuaestiones Entomologicae
Volume7
Pages1-234
Specimen Information
There are 2 specimens of this Species.
2 results plotted on map in 2 markers. Note: Only records with latitude and longitude coordinates are plotted on map.