Gnathusa eva Fenyes

Klimaszewski, Jan, Webster, Reginald P., Langor, David W., Bourdon, Caroline, Hammond, H. E. James, Pohl, Greg R. & Godin, Benoit, 2014, Review of Canadian species of the genera Gnathusa Fenyes, Mniusa Mulsant & Rey and Ocyusa Kraatz (Coleoptera, Staphylinidae, Aleocharinae), ZooKeys 412, pp. 9-40 : 13-14

1. Gnathusa eva Fenyes Figure 1 a–l, Map 1

Gnathusa eva Fenyes 1909: 198, 1920: 352, Moore and Legner 1975: 458, Majka and Klimaszewski 2008: 88.

Diagnosis.

Body length 3.5-4.0 mm, sides subparallel; body colour light brown to dark brown, antennae and tarsi rust-brown, head and abdomen often dark brown; integumental microsculpture dense and surface moderately glossy; head round and almost as wide as pronotum with labrum bearing long spines; pronotum transverse, angular, wider than maximum width of elytra; elytra at suture subequal in length to pronotum; abdomen subparallel; antennal articles 6-10 moderately-to-strongly transverse, last article short and broadly oval (Fig. 1a). MALE: tergite VIII widely truncate apically (Fig. 1c); sternite VIII slightly pointed at apex (Fig. 1d); median lobe of aedeagus with tubus arcuate and apex pointed and produced ventrally in lateral view (Fig. 1b). FEMALE: tergite VIII truncate apically (Fig. 1f); sternite VIII rounded apically (Fig. 1g); spermatheca pipe-shaped, with short sac-shaped capsule and long, thin and sinuate stem, spermathecal neck weakly sclerotized and neck to capsule angle variable (Fig. 1e).

Distribution.

The Canadian distribution of this native Nearctic species includes Alberta [new provincial record], British Columbia ( Majka and Klimaszewski 2008), and Yukon Territory (Map 1). It is also known from California ( Fenyes 1909).

Bionomics.

Adults were captured in clear-cut Sitka spruce forest on Vancouver Island and in moss and gravel at the edge of small pools at other localities in the interior of British Columbia ( Klimaszewski and Winchester 2002). Additional specimens were found in British Columbia in a 1-year-old harvested Douglas-fir stand. In west-central Alberta, adults were collected in pitfall traps deployed in Upper Cordilleran coniferous forests, including subxeric lodgepole pine forests, mesic white spruce and lodgepole pine stands and spruce-dominated subhygric and hygric forests, but not in deciduous-dominated forest or in grassy or shrubby meadows. In Alberta, adults also emerged from lodgepole pine trees infested by bark beetles. In the Yukon Territory, adults were found in a squirrel midden in spring, probably overwintering, and in a coniferous woodchip pile.

Locality data.

CANADA: Alberta: Lusk Creek, Kananaskis F.E.S., 14.VII.1971, J.M. & B.A. Campbell (CNC) 1 male, 4 females; vicinity of Swan Hills, 54°42'N, 115°23'W, Picea / Pinus forest, 15.VI.1990, D.W. Langor (NoFC) 2 males; Grande Prairie, 64 km S, 54.5597°N, 118.6633°W, emergence trap on MPB infested lodgepole pine, 14 July 2011, col. Bleiker (NoFC) 1 female; same data except 15 July 2011, 1 female, 1 sex undetermined; Grande Prairie, 75 km S, 54.4706°N, 118.6560°W, 13 Aug. 2011, emergence trap on MPB infested lodgepole pine, col. Bleiker (NoFC) 1 sex undetermined; Fox Creek, 24 km E, 54.4575°N, 116.4377°N, emergence trap on MPB infested lodgepole pine, 9 Aug. 2011, col. Bleiker (NoFC) 1 female; Fox Creek, 7 km SW, 54.3241°N, 116.8335°W, emergence trap on MPB infested lodgepole pine, 18 July 2011, col. Bleiker (NoFC) 1 sex undetermined; 20 km NW Hinton, 4 km NW of Jarvis Lake, 53.484°N, 117.854°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite I1, Stand I103, pitfall trap # 4, 19. VI– 3.VII.2004, J. Hammond et al. coll. (NoFC) 1 sex undetermined; 20 km S Hinton, 31.V.1990, pitfall trap, D. Langor (NoFC) 1 sex undetermined; 21.3 km NW Hinton, W.A. Switzer Prov. Pk., 53.529°N, 117.824°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite E1, Stand E129, pitfall trap # 5, 3-17.VII.2004, J. Hammond et al. coll. (NoFC) 1 female; 23 km NW Hinton, 1.7 km W of Gregg Lake, 53.545°N, 117.821°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite H1, Stand H101, pitfall trap # 1, 2-16.VII.2004, J. Hammond et al. coll. (NoFC) 1 female; 25 km NW Hinton, west side Hay River Rd., 53.502°N, 117.909°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite C1, Stand C101, pitfall trap # 4, 2-17.VII.2004, J. Hammond et al. coll. (NoFC) 1 male; same data except: pitfall trap # 6, 17-31.VII.2004, J. Hammond et al. coll. (NoFC) 1 sex undetermined; 26 km SE Hinton, 7 km S of Gregg River Rd., 53.220°N, 117.343°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite H1, Stand H104, pitfall trap # 1, 16. V– 1.VI.2004, J. Hammond et al. coll. (NoFC) 2 sex undetermined; 32 km NW Hinton, 1 km W of Rock Lake Rd., 53.561°N, 117.998°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite F1, Stand F104, pitfall trap # 1, 2-16.VI.2004, J. Hammond et al. coll. (NoFC) 1 male, 5 sex undetermined; 33 km NW Hinton, 3.75 km N of Highway 40, 53.594°N, 117.964°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite E1, Stand E108, pitfall trap # 4, 4-18.VI.2004, J. Hammond et al. coll. (NoFC) 1 female, 1 sex undetermined; 34 km NW Hinton, 0.5 km W of Highway 40, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite F1, Stand F102, pitfall trap # 4, 4-18.VI.2004, J. Hammond et al. coll. (NoFC) 3 sex undetermined; 35 km NW Hinton, 3.75 km N of Highway 40, 53.596°N, 118.002°W, Ecoregion: UF, Ecosite D1, Stand D109, pitfall trap # 4, 2-16.VII.2004, J. Hammond et al. coll. (NoFC) 1 female; 36 km NW Hinton, 3.75 W of Rock Lake Rd., 53.564°N, 118.046°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite I1, Stand I107, pitfall trap # 4, 14. V– 4.VI.2004, J. Hammond et al. coll. (NoFC) 1 female; 59 km NW Hinton, 3.5 km N of Polecat Rd., 53.902°N, 117.911°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite H1, Stand H105, pitfall trap # 2, 3-17.VI.2004, J. Hammond et al. coll. (NoFC) 1 sex undetermined; 62 km N Hinton, 5 km W of J. Wright Rd., 53.969°N, 117.668°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite F1, Stand F105, pitfall trap # 2, 12. V– 2.VI.2004, J. Hammond et al. coll. (NoFC) 1 female, 1 sex undetermined; 63 km N Hinton, 3.75 km S of J. Wright Rd., 53.974°N, 117.449°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite D1, Stand D102, pitfall trap # 2, 30. VI– 14.VII.2004, J. Hammond et al. coll. (NoFC) 1 male, 1 female; 65 km N Hinton, 5 km W of J. Wright Rd., 53.995°N, 117.656°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite E1, Stand E118, pitfall trap # 5, 30. VI– 14.VII.2004, J. Hammond et al. coll. (NoFC) 1 sex undetermined; 67 km N Hinton, north side of J. Wright Rd., 53.998°N, 117.435°W, Ecosite Surrogacy Study, Ecoregion: UF, Ecosite D1, Stand D104, pitfall trap # 2, 2-16.VI.2004, J. Hammond et al. coll. (NoFC) 1 sex undetermined. British Columbia: Fort St. James, PG13B-trap 4, 10.V. 1995 (CNC) 1 female; same data except: GP 11 km-2, 1 year post harvest (CNC) 1 male; GP 115, 30.V.1996, 1 year post harvest, R. Felix (CNC) 1 male; 20.VI.1920, GP 11 km, 2 years post harvest, D. Rodriguez (CNC) 1 female; 4.VIII.1996, Tachie-Pinchi, M. Cloet, trap 5 (CNC) 1 female; GP 11 km-2, 10.V.1995, 1 year post harvest (CNC) 3 females; 21 km SW Campbell River, 49°51'55"N, 125°27'51"W, 22.V-6.VI.1996, Balsam Cr., LT 1-T, 1-E (LFC) 2 males; Monashee Mountain near Cherryville, 12.VIII.1982, R. Baranowski (LFC, MZLU) 1 female, 1 sex undetermined [published record Majka and Klimaszewski 2008]. Yukon Territory: Whitehorse, Paddy’s Pond, 15.V.2010, 60.7067°N, 135.0917°W, 649 m, soil sifting, squirrel midden, B. Godin (ECW) 2 males, 3 females; Whitehorse, Granger subdivision, coniferous woodchip pile, 2.IX.2007, 60.7097°N, 135.0996°W, 661 m, pitfall trap, B. Godin (ECW) 1 male; same data as before except: 3.V.2008 (ECW) 2 males.

UNITED STATES OF AMERICA: California: Mono Co., 6 mi SW Toms Place, 9000', 8.VIII.1969, A. Smetana (CNC) 3 males, 1 female [not shown in Map 1].