Quedius armipes (Sharp)

Brunke, A. J., Salnitska, M., Hansen, A. K., Zmudzinska, A., Smetana, A., Buffam, J. & Solodovnikov, A., 2020, Are subcortical rove beetles truly Holarctic? An integrative taxonomic revision of north temperate Quedionuchus (Coleoptera: Staphylinidae: Staphylininae), Organisms Diversity & Evolution (New York, N. Y.) 20 (1), pp. 77-116 : 111

Quedius armipes (Sharp) : Smetana 1995 (from Kunashir Island, Russia)

Quedionuchus armipes Sharp : Brunke and Solodovnikov 2013 ( Quedionuchus as valid genus)

Type locality: Nikko , Yuyama and Shimidzu [=Shimizu], Honshu, Japan .

Type material. Syntypes: Quedionuchus armipes Type D.S., Yuyama, 11.5.1881, Lewis [handwritten card]/Type [circular label with orange border]/ Japan G. Lewis 1905-313 [printed label]/AJB0001088 [printed]/ Quedionuchus armipes SYNTYPE det. Brunke 2018 [red printed label] (1 female, BMNH). Same except: Nikko, no date and no circular type label (1 female, BMNH)/AJB0001087/ SYNTYPE det. Brunke 2018 [red printed label]

Sharp (1888) described this species from four specimens collected by G. Lewis in Nikko, Yuyama and Shimidzu [=Shimizu], Japan. Two specimens (two females) of this distinctive species were available for study. As there is no confusion about the identity of the species, no lectotype was designated .

Other material. RUSSIA: Sakhalin: Kunashir Island, Vicinity of Mendeleyeva, 43.97 145.73, V.A. Pototskaya, 18.IV.1977 (3, CNC); Kunashir Island , Mendeleevo, 43.97 145.73, under bark of Phellodendron sp. [cork tree], V.A. Pototskaya, 22.VI.1977 (1, CNC) .

Diagnosis. Easily recognized by the lobed hind femur in both sexes ( Fig. 4a ), flattened body, doubled basal puncture of the head and flattened, non-shield shaped pronotum ( Fig. 3a ). Paramere slightly asymmetrical, median lobe with broadly rounded apex in ventral view ( Fig. 6l–m ).

Redescription. Measurements ♂ (n = 3): HW/HL 1.29–1.37; PW/PL 1.13–1.19; EW/EL 1.08–1.13; ESut/PL 0.89–0.95; PW/HW 1.03–1.07; forebody length 3.6– 3.9 mm.

Measurements ♀ (n = 3): HW/HL 1.30–1.36; PW/PL 1.17–1.21; EW/EL 1.06–1.10; ESut/PL 0.91–0.93; PW/HW 1.07–1.10; forebody length 3.1–3.8 mm.

Head, pronotum and abdomen dark brown, sometimes pal- er, reddish brown, scutellum dark, elytra dark reddish brown with dark brownish base and, often, sutural area, becoming reddish laterally, legs yellowish brown, with inner faces of tibiae dark brownish, maxillary palpi brownish, apical segment often paler, yellowish brown, labial palpi yellowish brown, antennomeres 1–3 dark brown with reddish base and apex, segments 4–10 reddish brown, apices of abdomen paler, reddish, pale area broadest on segment VII.

Head distinctly to markedly transverse, disc with moderately coarse microsculpture of transverse waves, with frontal impression rather deep on some male specimens, eyes rather small, distinctly smaller than temples, much less convex than in other Old World species of Quedionuchus , with genal puncture, basal puncture doubled, one puncture distinctly anteriad of the other; antennomeres 1–3 elongate, 4 quadrate to weakly transverse, 5–10 increasingly transverse; pronotum distinctly transverse, with rather truncate base and apex, not typical shield-shape of Quediini ( Fig. 3a ), disc relatively flattened, with moderately coarse microsculpture of transverse waves, waves between microsculpture transverse, not whorled, with 3–4 punctures in the dorsal row; hind femora with distinctly expanded posterior margin bearing longer spines, this expansion not sexually dimorphic, though smaller specimens with less developed expansions; punctation of abdominal tergites moderately asperate, punctures separated by about 1.5– 2.5 their puncture diameters, with distinct impunctate area on first visible abdominal tergite, abdominal tergites with fine, dense microsculpture of transverse waves, separated by approximately their widths.

Male. Sternite VII without emargination or glabrous area, sternite VIII with distinct but shallow emargination, tergite X triangular, evenly converging to apex, sternite IX relatively broad, with broad, shallowly emarginate apex. Median lobe in ventral view slightly asymmetrical, with short, broad but still acute apex, apical part set apart by lateral ridge at each side ( Fig. 6 m ), median lobe in lateral view with apical part broad, converging to broadly rounded apex ( Fig. 6n ), paramere elongate, slightly asymmetrical, not reaching apex of median lobe ( Fig. 6l, o ), peg setae arranging in two short apical fields of 6–9.

Female. Tergite X without central lobe, simple and unmodified, lacking carinae or raised discal areas ( Fig. 7f )

Distribution. Known from Honshu, Japan (‘Shimidzu’ [=Shimizu], Yuyama and Nikko) and Kunashir Island in Russia ( Sharp 1888; Smetana 1995).

Figures

Fig. 4 Quedionuchus armipes Sharp, expansion of hind femur (a); Q. longipennis (Mannerheim), microsculpture of pronotum (b); Q. longipennis (Mannerheim), microsculpture of tergite V (c); Q. plagiatus (Mannerheim), microsculpture of sternite V–VI (d);

Fig. 3 Dorsal habitus of: Quedionuchus armipes (Sharp) (a), Q. reitterianus (Bernhauer) (b), Q. yunnanensis (c), and Q. longipennis (d–f), (three colour morphs). Photo of Q. armipes by K.V. Makarov

Fig. 6 Quedionuchus glaber (O. Müller) (a, West Palaearctic, b, d, East Palaearctic), Q. longipennis (Mannerheim), typical shape (c), Q. plagiatus (Mannerheim) (e–g), Q. gilaensis Brunke (i–k) and Q. armipes Sharp (l–o). Aedeagus in ventral view (l), median lobe in

Fig. 7 Female tergite X of: Quedionuchus samuraicus (Bernhauer and Schubert) (a); Q. reitterianus (Bernhauer) (b); Q. longipennis (Mannerheim) (c); Q. plagiatus (Mannerheim) (d); Q. gilaensis Brunke (E); Q. armipes Sharp (F). Scale bars = 0.5 mm