Gnathusa caribou Lohse

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 : 17-19

3. Gnathusa caribou Lohse Figure 3 a–l, Map 2

Gnathusa caribou Lohse, in Lohse et al. 1990: 146; Klimaszewski et al. 2011: 55.

Diagnosis.

Body length 2.8-3.6 mm, sides narrowly subparallel; body colour dark brown to almost black, with antennae bright yellow and tarsi rust-brown to yellowish; integumental microsculpture dense and surface strongly glossy; head round, about the same size as the pronotum, labrum lacking stout spines but with fine setae of unequal length; pronotum small, transverse, angular, slightly narrower than elytra; elytra at suture subequal in length to pronotum; abdomen subparallel; antennal articles 6-10 subquadrate to slightly transverse, last article short and broadly oval (Fig. 3a). MALE: tergite VIII widely truncate apically (Fig. 3c); sternite VIII slightly pointed at apex (Fig. 3d); median lobe of aedeagus with tubus almost straight and apex pointed ventrally in lateral view (Fig. 3b). FEMALE: tergite VIII truncate apically (Fig. 1f); sternite VIII rounded apically (Fig. 3g); spermatheca pipe-shaped, with spherical capsule and long and straight stem, neck well sclerotized (Fig. 3e).

Distribution.

This native Nearctic species is known in Canada from the Northwest Territories and Yukon Territory (Map 2), and from Alaska ( Lohse et al. 1990).

Bionomics.

Adults were captured from June to July in tundra by sifting organic litter under Salix , moss, and a pile of leaves stored by a rodent.

Locality data.

CANADA: Northwest Territories: Lac Maunoir, North shore, 19-27.VII.1969, G.E. Shewell (CNC) 1 male; Reindeer Sta., Caribou Hills, 2.VII.1972, A. Smetana (CNC) 1 male, 2 females, 1 sex undetermined [paratypes]; same label data except: 30.VI.1972 (CNC) 1 female [paratype]. Yukon Territory: British Mts., Firth River, 250 m, 69°13'N, 140°04'W, 25.VI.1984, 84-31, tundra, sifting litter under Salix (CNC) 1 male [holotype]; same label data (CNC) 1 female, 3 sex undetermined [paratypes]; British Mts., Windy Ridge, 550 m, 69°27'N, 140°25'W, 2.VII.191984, 84-46, sifting moss, J.M. Campbell (CNC) 4 sex undetermined [paratypes]; British Mts., Fish Creek, 200 m, 69°27'N, 140°23'W, 5.VII.1984, 84-58, sifting moss and arctic willow on tundra, J.M. Campbell (CNC) 1 female, 4 sex undetermined [paratypes]; British Mts., Sunday Mts., 680 m, 69°14'N, 140°05'W, 24.VI.1984, sifting pile of leaves stored by rodent, J.M. Campbell (CNC) 1 male, 2 females, 4 sex undetermined [paratypes]; Dawson City, 11.VII.1968, Campbell and Smetana (CNC) 1 male, 1 female; Dempster Hwy., mi 53, North Fork Pass, 24.VII.1978, 4200', A. Smetana and J.M. Campbell (CNC) 1 female, 1 sex undetermined [paratypes].

UNITED STATES OF AMERICA: Alaska: Prudhoe Bay Rd., 9 mi N Atigun Pass, 68°14'N, 149°25'W, 6.VII.1978, 3100', J.M. Campbell and A. Smetana (CNC) 1 female, 3 sex undetermined [paratypes]; mi 104.5 Denali Hwy., Brushkana Cr., 15.VII.1978, A. Smetana and J.M. Campbell (CNC) 1 sex undetermined [paratype]; mi 110 Denali Hwy., Seattle Cr., 15.VII.1978, J.M. Campbell and A. Smetana (CNC) 1 male [paratype]; mi 24, Wales Hwy., Hess Cr., 600', 65°40'N, 149°10'W, 10.VII.1978, J.M. Campbell and A. Smetana (CNC) 1 male [non-paratype].