Quedionuchus Sharp, 1884

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 : 84-86

Key to species of Nearctic, Palaearctic and Oriental Quedionuchus Sharp

1. Hind femur of both sexes with variously expanded lobe ( Figs. 3a and 4a ); head with doubled basal puncture; aedeagus as in Fig. 6l–o ; female tergite X without a central lobe ( Fig. 7 f ); Japan and Kuril Islands ( Russia)………………………………… Q. armipes Sharp

– Hind femur of both sexes without a lobe; head with single basal puncture; female tergite X with a central lobe ( Fig. 7a–e )…………………………………………………..2

2. Elytra with pale marking on dark background ( Fig. 3b–c ); eyes bulging and occupying more than ¾ of the lateral head ( Fig. 3b ); dorsal head and pronotum with, at least in some places, meshed microsculpture; aedeagus as in Fig. 5m –o ; female tergite X with a central raised disc delineated by carinae ( Fig. 7b ); mainland China ……………………...3 – Elytra either unicolourous or with dark markings on pale background ( Fig. 3a, d–f ); eyes sometimes large but less than ¾ of the lateral head ( Fig. 3a, d–f ); dorsal head and pronotum with microsculpture of transverse waves only; female tergite X with disc not delineated by carinae ( Fig. 7a, c–e )………………………………………………...4

3. Pronotum subquadrate and slightly but distinctly paler than head ( Fig. 3b ); head and pronotum with extensive meshed microsculpture; median lobe in lateral view with broad, fin-like subapical tooth ( Fig. 5m ); known from Sichuan, China ……………... Q. reitterianus (Bernhauer)

– Pronotum distinctly transverse and not appreciably paler than head ( Fig. 3c ); head and pronotum mostly consisting of transverse waves but with small patches of mesh; median lobe in lateral view with subapical tooth acute and deeply incised below ( Fig. 5n ); known from Yunnan, China …………….. Q. yunnanensis Brunke , new species

4. Waves of microsculpture between dorsal rows of the pronotum transverse, not whorled; paramere spoon-shaped( Fig. 5d, h, l ); female tergite X with arch-like, often raised, sclerotized markings at base of central lobe ( Fig. 7a ); body always entirely dark (as in Fig. 3d ); West Caucasus, and East Palaearctic and Oriental Regions………………………...(Samuraicus Group)…5

– Waves of microsculpture between dorsal rows of the pronotum whorled ( Fig. 4b ); paramere elongated ( Fig. 6d ); female tergite X without sclerotized markings at base of central lobe ( Fig. 7c–e ); body of various colour patterns, including entirely dark; Palaearctic and Nearctic Regions… (Glaber Group)…………………………….7

Figures

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. 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. 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

Fig. 5 Quedionuchus samuraicus (Bernhauer and Schubert) (a–d), Q. deceptor Brunke (e–h), Q. caucasicus Brunke (i–i), Q. reitterianus (Bernhauer) (m, o, p), and Q. yunnanensis Brunke (N). Aedeagus in