Species Details

Hesperoperla pacifica

Freshwater Invertebrate Collection Read more about this collection »

SeasonalityAdults emerge over a two-week period from late June to early July. IdentificationMales (length = 25 mm) have paraprocts that are flattened, triangular and sharply pointed at their anteriorly directed tips, but lack spinules on Tergites 9 and 10. Females (length = 37 mm) have the subgenital plate produced over half of Sternum 9; the hind margin of the subgenital plate is slightly angular and usually has a squarish shiny spot at its apex. The nymph has anal gills but lacks an occipital ridge. The nymphal head has a yellow mark extending from the labrum to the anterior ocellus and dark brown abdominal terga.

Scientific Name Hesperoperla pacifica Seasonality Adults emerge over a two-week period from late June to early July. Identification
Males (length = 25 mm) have paraprocts that are flattened, triangular and sharply pointed at their anteriorly directed tips, but lack spinules on Tergites 9 and 10. Females (length = 37 mm) have the subgenital plate…
Males (length = 25 mm) have paraprocts that are flattened, triangular and sharply pointed at their anteriorly directed tips, but lack spinules on Tergites 9 and 10. Females (length = 37 mm) have the subgenital plate produced over half of Sternum 9; the hind margin of the subgenital plate is slightly angular and usually has a squarish shiny spot at its apex. The nymph has anal gills but lacks an occipital ridge. The nymphal head has a yellow mark extending from the labrum to the anterior ocellus and dark brown abdominal terga.
Life History The life cycle is three years, and the nymphal habitat is under larger rocks in regions of the stream with the swiftest current. Conservation The species is not endangered, but as with all stoneflies, it is sensitive to organic pollution. Diet Info Nymphs are carnivorous, preying principally on mayfly nymphs and chironomid and caddis fly larvae. Range In Alberta, the species is known from the Cypress Hills and Bow River. In North America, it ranges from British Columbia to California and New Mexico and east to South Dakota and Saskatchewan.

Citation

Page Citation for Hesperoperla pacifica

Page Citation

"Hesperoperla pacifica, Freshwater Invertebrate Collection." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/5-2127. Accessed 23 May. 2022.

Taxonomic Hierarchy

Kingdom Animalia Phylum Arthropoda Class Hexapoda Subclass Insecta Order Plecoptera Family Perlidae Subfamily Acroneuriinae Genus Hesperoperla Species Hesperoperla pacifica
This hierarchy is created from our museum records, it may not always accurately reflect modern taxonomies.

Taxonomic Hierarchy for Freshwater Invertebrate Collection

Disclaimer
This hierarchy is created from our museum records, it may not always accurately reflect modern taxonomies.

Authorship

Name Dosdall, L.
Role species page author
Name Robinson, E.
Role species page editor

Specimen Information

There are 6 specimens of this Species.

5 results plotted on map in 4 markers.
Note: Only records with latitude and longitude coordinates are plotted on map.

IN985 - Hesperoperla pacifica

Freshwater Invertebrate Collection

Place CollectedCanada: Alberta

IN982 - Hesperoperla pacifica

Freshwater Invertebrate Collection

Place CollectedCanada: Alberta, Clearwater River (Undet.) Collected ByRoberts, Wayne E. Date Collected1970-09

IN2713 - Hesperoperla pacifica

Freshwater Invertebrate Collection

Place CollectedCanada: British Columbia, Yoho National Park, Emerald River Collected ByCanadian Wildlife Service Date Collected1971-08-20

IN2635 - Hesperoperla pacifica

Freshwater Invertebrate Collection

Place CollectedCanada: Alberta, Banff National Park, Bow River Collected ByCanadian Wildlife Service Date Collected1973-07-06

IN1443 - Hesperoperla pacifica

Freshwater Invertebrate Collection

Place CollectedCanada: Alberta, Crowsnest River Collected ByLeong, R. Date Collected1970-10-10

IN2634 - Hesperoperla pacifica

Freshwater Invertebrate Collection

Place CollectedCanada: Alberta, Banff National Park, Bow River Collected ByCanadian Wildlife Service Date Collected1972-07-19