Nearctic Nemoura Trispinosa Claassen, 1923 And N. Rickeri Jewett, 1971 Are Junior Synonyms Of Holarctic Nemoura Species (Plecoptera: Nemouridae) Author Grubbs, Scott A. , Richard W. Baumann & Department of Biology and Center for Biodiversity Studies, Western Kentucky University, Bowling Green, Kentucky 42101, U. S. A. E-mail: scott. grubbs @ wku. edu scott.grubbs@wku.edu Author Baumann, Richard W. , and David K. Burton & Department of Biology, Monte L. Bean Life Science Museum, Brigham Young University, Provo, Utah, U. S. A., 84602. E-mail: richard _ baumann @ byu. edu richard_baumann@byu.edu Author Burton, David K. Faculty of Education, University of Ottawa, Ottawa, Ontario, Canada K 1 N 6 N 5 E-mail: dburton @ uottawa. ca & Canadian National Collection, Agriculture Canada, Central Experimental Farm, Ottawa, Ontario, Canada K 1 A 0 C 6 dburton@uottawa.ca text Illiesia 2018 14 3 44 64 journal article http://doi.org/10.5281/zenodo.4761204 7e69e5d0-b481-4034-bc40-7cd95db92d59 1854-0392 4761204 66C4E575-ABF5-4B81-9132-0D771B52D68 Nemoura sahlbergi Morton, 1896 ( Figs. 53‒84 ) http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org: TaxonName:6326 Nemoura sahlbergi Morton 1896:56 . Holotype ♂ , Type locality – Utsjoki , Lake Enara , Finland Nemoura sahlbergi : Claassen 1940:63 Nemoura trispinosa : Ricker 1944:177 . In part Nemoura sahlbergi : Brinck 1952:104 Nemoura sahlbergi : Zhiltzova 1964:187 Nemoura sahlbergi : Meinander 1965:17 Nemoura sahlbergi : Illies 1966:212 . Nemoura rickeri Jewett, 1971:190 . Type locality – Cache Creek, 19 mi E Eureka, Glenn Highway, Alaska . New synonym ( Paratype ♂ examined) Nemoura sahlbergi : Lillehammer 1972b:157 Nemoura sahlbergi : Benedetto 1973:20 Nemoura sahlbergi : Zwick 1973a:340 Nemoura sahlbergi problematica : Zwick 1973b:162 . Type locality – Diamond Range, Kangwon Province, People’s Republic of Korea . Nomen dubium Zwick 2010 Nemoura sahlbergi : Lillehammer 1974a:85 Nemoura rickeri : Dosdall & Lehmkuhl 1979:34 Nemoura rickeri : Stewart & Oswood 2006:78 Distribution. Canada : MB, NT, NU, SK, YK. Europe: Baltic States, Finland , Norway , Sweden . Mongolia . Russia East, Russia North. USA : AK ( DeWalt et al. 2018 ). Figs. 41–46. Nemoura arctica , epiproct, dorsal view. 41, USA, Iowa, Twin Springs, 584X; 42, USA, Illinois, Elgin, 519X; 43, USA, South Dakota, Burnt Fork, 669X; 44, Canada, Saskatchewan, Promontory Campground, 1056X; 45, Canada, New Brunswick, Coombs Brook, 770X; 46, Canada, Prince Edward Island, Balsam Hollow, 695X. AP = apical prong. Diagnosis. Cercus . Highly variable. Male cerci are sclerotized laterally and terminate in either one ( Figs. 54–57, 59 ) or two ( Figs. 53, 58, 60 ) produced, curved spines that vary in length, curvature, and degree of tapering, plus a third unit (= outer spine) that tapers little and is typically crenulated distally. Epiproct . Males exhibit consistency with epiproct shape and characteristics across the Holarctic with only minor differences between individuals. In lateral aspect, the basal cushion occupies the anterior ca. ½ and is separated from the dorsal sclerite by smooth lateral areas ( Figs. 61–68 ). The lateral areas are consistently recurved slightly over the distal medial portion of the basal cushion. The dorsal sclerite is open apically, exposing paired, rounded apical prongs bearing scale-like ridges, terminating laterally into one or two stout, grooved lateral spines ( Figs. 69–76 ). The apical prongs are positioned either ca. parallel ( Figs. 82, 84 ) or ca. diagonal to the ridges ( Figs. 77–81, 83 ). Figs. 47–52. Nemoura arctica , epiproct, dorsal view. 47, Canada, Northwest Territories, Thelon River, 1161X; 48, Russia, Siberia, Magadan Oblask, 1204X; 49, Norway, Buktved Garnvika, 751X; 50, Norway, Kautokeino, 809X; 51, Mongolia, Khoton Lake, 598X; 52, Mongolia, Tsagaaan Lake, 969X. AP = apical prong. Comments. The synonymy of N. rickeri with N. sahlbergi has been suggested previously (e.g. Lillehammer 1972b ; Boumans & Brittain 2012 ). Jewett (1971) noted in his description of N. rickeri that this species “…is similar to the rare northern European Nemoura sahlbergi …”. Lillehammer (1972a , his Fig. 29.4 ) illustrated several different cercal forms from Norway , showing variability in the curved and outer spines. The epiproct apical prongs studied herein from the Northwest Territories ( Fig. 78 ), Alaska ( Fig. 80 ), Norway ( Fig. 82 ), and Mongolia ( Fig. 84 ) are consistent with illustrations or images in Lillehammer (1972a , his Fig. 31.3 ; Norway ), Boumans (2011 , his Fig. 2 ; Norway ) and Judson & Nelson (2012 , their Fig. 187; Mongolia ). Figs. 53–60. Nemoura sahlbergi , cerci, distal view. 53, Canada, Manitoba, Goose Creek, 347X; 54, USA, Alaska, 7 mi E Eureka, 586X; 55, USA, Alaska, 7 mi E Eureka, 397X; 56, USA, Alaska, Ogotoruk Creek, 546X; 57, Norway, Gargiaelva, 740X; 58, Norway, Baukop, 941X; 59, Norway, Finnmark, 610X; 60, Mongolia, Khovsgol Aimag, 568X. Figs. 61–68. Nemoura sahlbergi , epiproct, lateral view. 61, Canada, Manitoba, Goose Creek, 306X; 62, Canada, Yukon, Glacier Creek, 380X; 63, USA, Alaska, 7 mi E Eureka, 560X; 64, USA, Alaska, Ogotoruk Creek, 324X; 65, Norway, Gargiaelva, 394X; 66, Norway, Baukop, 334X; 67, Norway, Finnmark, 316X; 68, Mongolia, Khovsgol Aimag, 418X. AP = apical prong, BC = basal cushion, DS = dorsal sclerite, LA = lateral area, VS = ventral sclerite. Geographic notes. Holarctic: Scandinavia east across Asia; in North America from Alaska east to Nunavut and Manitoba. South in Europe to Latvia and in eastern Asia south to Mongolia and far eastern Siberia. South in North America to the treeline in the Saskatchewan River Basin in Manitoba and Saskatchewan. Additional notable references include Rauser (1968) , Lillehammer (1972a , 1974, 1985, 1988), Burton (1984) , Teslenko & Bazova (2009) , Zhou et al. (2010) , Zwick (2010) , Boumans (2011) , Boumans & Brittain (2012) , and Judson & Nelson (2012) .