Alloperla severa (Hagen)

Baumann, Richard W. & Kondratieff, Boris C., 2008, The Alloperla Severa Complex (Plecoptera: Chloroperlidae) Of Western North America., Illiesia 4 (6), pp. 66-75 : 67-69

publication ID	https://doi.org/ 10.5281/zenodo.4758963
DOI	https://doi.org/10.5281/zenodo.4758880
persistent identifier	https://treatment.plazi.org/id/43182F76-5D42-585B-FEE2-E87D5EC0FB88
treatment provided by	Felipe
scientific name	Alloperla severa (Hagen)
status

Treatment

Alloperla severa (Hagen) View in CoL

( Figs. 1‐8 View Figs )

Perla severa Hagen 1861: 30 . Holotype male, Museum of Comparative Zoology, Harvard, MCZC #252 (abdomen missing): Unga Island , Alaska.

Alloperla severa, Lyon & Stark 1997: 327 View in CoL . In part.

Material examined. CANADA: ALBERTA: Bow River , 5 mi. W Canmore, 29 July 1965, R . K. Allen, 2 ♂, 8 ♀ ( BYUC); Waterton River, Mountain View , 20 July 2000, E. Fuller, 5 ♂, 10 ♀ ( BYUC) . BRITISH COLUMBIA: Quesnel , 16‐25 June 1949, G.J. Spencer & R . S. Smith, 1 ♂, 2 ♀ ( SMDV) . NORTHWEST TERRITORIES: Trail River , 62° 06’ N 122° 12’ W, 12 July 1973, D.M. McClymont, 1 ♂, 1 ♀ ( ROMC) GoogleMaps . YUKON TERRITORY: 14 mi. E Dawson, 2 July 1962, P.J. Skitsko, 1 ♂, 1 ♀ ( CNIC); Little Creek Campground, 15 July 1984, E.C. Masteller, 1 ♂ ( BYUC) . USA: ALASKA: Alagnak River, below Kukaklet Lake, above Hallersville , 23 June 2000, R . Beatty, 4 ♂, 2 ♀ ( KWSC); Bay of Islands Creek, Naknek Lake, Katmai National Monument , 4 July 1969, K.J. Raedeke, 1 ♂, 2 ♀ ( BYUC); 14 July 1969, K.J. Raedeke, 1 ♂, 1 ♀ ( BYUC); Brooks River , at Falls, Katmai National Monument, 4 July 1969, K.J. Raedeke, 1 ♂ ( BYUC); 25 July 1969, K.J. Raedeke, 6 ♂, 17 ♂ ( BYUC); Crooked Creek , near Kasilof, Kenai Pennisula, 16 June 1990, B.F. Robison, 6 ♂, 5 ♀ ( BYUC); Kenai River , Hwy 1, Cooper Creek Campground, 14 July 2003, C. Kerst, 5 ♂, 2 ♀ ( BYUC, CSUC) . IDAHO: Adams Co., East Fork Goose Creek, New Meadows , 26 June 1960, A. R . Gaufin, 2 ♂, 1 ♀ ( BYUC). Blaine Co., Big Wood River, Hwy 93, N Hailey, 17 June 1964, A. R . Gaufin, 1 ♂ ( BYUC). Lemhi Co., Birch Creek, Hwy 28, Lone Pine , 1 July 1968, A. R . Gaufin, 1 ♂, 1 ♀ ( BYUC). Salmon River, Hwy 93, N Salmon, 19 June 1963, A. R . Gaufin, 1 ♂, 2 ♀ ( BYUC); Wagonhammer Spring, Hwy 93, S North Fork, 17 June 1965, A. R . Gaufin, 1 ♂ ( BYUC). Shoshone Co., Coeur d’Alene River, Rd 10, E Kingston, 11 June 1969, A. R . Gaufin, 40 ♂, 21 ♀ ( BYUC) . MONTANA: Beaverhead Co., Big Hole River, Hwy 91, Melrose , 5 Aug. 1966, J. R . Grierson, 1 ♂ ( BYUC); Big Hole River, Hwy 91, 5 mi. S Divide, 13 Aug. 1967, A. R . Gaufin, 4 ♂, 5 ♀ ( BYUC); Big Hole River, Hwy I‐15, Glen , 19 June 2004, R . W. Baumann & B.P. Stark, 24 ♂, 10 ♀ ( BPSC & BYUC); Wise River , 15 mi. S Wise River, 7 Aug. 1966, J. R . Grierson, 1 ♂, 1 ♀ ( BYUC). Cascade Co., Sun River, Hwy 20, Sun River , 24 June 1965, A. V . Nebeker, 2 ♂, 4 ♂ ( BYUC). Flathead, Co. , Dutch Creek , North Fork Road , Glacier National Park , 11 July 1969, M.L. Miner, 12 ♂ ( BYUC); Flathead River , Hwy 2, Berne Memorial Park , 3 mi. W Hungry Horse, 6 July 1965, A. V . Nebeker, 7 ♂, 7 ♀ ( BYUC); Middle Fork Flathead River, Hwy 2, Essex , 8 July 1967, A. R . Gaufin, 16 ♂, 7 ♀ ( BYUC); Stillwater River, near Olney , 30 June 1967, A. R . Gaufin, 2 ♂, 4 ♀ ( BYUC). Glacier Co., Saint Marys River, Saint Marys Campground , Glacier National Park , 4 July 1968, A. R . Gaufin, 46 ♂, 50 ♀ ( BYUC); Saint Marys River, Lower Saint Marys Lake, Glacier National Park , 5 Aug. 1967, M.L. Miner, 16 ♂, 30 ♀ ( BYUC); Swift Current Creek , Glacier National Park , 13 July 1963, A. R . Gaufin, 2 ♂ ( BYUC). Granite Co., Rock Creek, Squaw Rock Campground , 2 July 1966, M.L. Miner, 5 ♂, 6 ♀ ( BYUC); Rock Creek , 5 mi. up Rock Creek Road , 20 July 1973, G. Roemhild, 1 ♂ ( CSUC). Lake Co. , Jocko River , Hwy 93, Ravalli , 19 July 1963, A. R . Gaufin, 5 ♂, 12 ♀ ( BYUC); Mission Creek, below Mission Falls, St. Ignatius , 25 June 1967, A. R . Gaufin, 4 ♂, 3 ♀ ( BYUC); Talking Water Creek, Hwy 35, below Blue Bay , Flathead Lake , 5 July 1967, A. R . Gaufin, 17 ♂, 32 ♀ ( BYUC). Lincoln Co., Fisher River, Hwy 2, 30 June 1973, A. R . Gaufin, 12 ♂, 26 ♀ ( BYUC); Pleasant Valley River, Hwy 8, mile 63, 19 June 1999, M.D. Terry, 2 ♂, 2 ♀ ( BYUC); Tobacco River , Hwy 93, near Eureka , 3 July 1964, A. R . Gaufin, 23 ♂, 30 ♀ ( BYUC). Missoula Co., Clark Fork River, Turah , 11 July 1962, R . L. Newell, 5 ♂, 9 ♀ ( BYUC). Pondera Co., Dupuyer Creek, Hwy 89, Dupuyer , 26 July 1967, A. R . Gaufin, 14 ♂, 19 ♀ ( BYUC). Powell Co., Little Blackfoot River, Hwy 12, above Elliston , 25 July 1963, A. R . Gaufin, 2 ♂, 8 ♀ ( BYUC); Snowshoe Creek, Hwy 12, E Avon , near junction Little Blackfoot River , 5 Aug. 1966, 1 ♂, 2 ♀ ( BYUC). Ravalli Co., Bitterroot River , Hwy 93, Medicine Hot Springs , 16 Aug. 1963, A. R . Gaufin, 5 ♂, 4 ♀ ( BYUC); Bitterroot River, River Park, Hamilton , 22 July 2005, R . Durfee, 2 ♂, 9 ♀ ( CSUC); 2 July 2006, R . Durfee, 20 ♂, 25 ♀ ( CSUC); 23 June 2007, R . Durfee, 11 ♂, 7 ♀ ( CSUC) .

Male. Macropterous. Length of forewing 7‐9 mm. General color, lime green in life, dirty white in alcohol. Head and pronotum without black markings. Dorsal aspect of epiproct elongate and narrow, subparallel, slightly broader at base, apex evenly rounded, with shallow crenulations ( Figs. 1, 2, 5, 7 View Figs ); surface bare in apical half, clothed with dense appressed setae in basal half ( Figs. 1‐8 View Figs ); beak‐ like in lateral view ( Figs. 3, 4, 6, 8 View Figs ). Stem clothed with fine setae (Figs. 1,5,7).

Female. Length of wings 8‐11 mm. Subgenital plate triangular, apex more acute, margin usually reaching to center or beyond sternum 9 ( Lyon & Stark 1997, Fig. 43).

Diagnosis. The male of A. severa can be distinguished from the closely related A. thalia by the more elongate and dorsally narrow, bare portion of the epiproct ( Figs. 1, 2, 5, 7 View Figs ). In lateral view, the epiproct of A. severa is more beak‐ like, with the apex dipping down beyond the ventral aspect, and the basal portion about ½ of the length of the epiproct ( Figs. 3, 4, 6, 8 View Figs ). The epiproct of the closely related A. thalia in lateral view, slopes to the apex or is almost hood‐ like, the bare portion being about 1/3 of the total epiproct length ( Figs. 19, 20, 22, 23 View Figs ). The females of A. severa and A. thalia cannot be reliably distinguished, other than by geographical proximity, or with the presence of associated males.

Remarks. Alloperla severa appears to be distributed throughout the northern Rocky Mountains in Canada and the United States, being especially abundant in western Montana.