Quedionuchus concolor Sharp, 1888: 34

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 : 93-94

Quedionuchus concolor Sharp, 1888: 34

Quedius samuraicus Bernhauer and Schubert, 1916: 433 (replacement name for Quedionuchus concolor Sharp, 1888 , a junior secondary homonym of Quedius concolor Sharp 1884 in Quedius at that time, now in Cyrtoquedius )

Quedius (Quedionuchus) samuraicus Bernhauer and Schubert : Coiffait 1974 (reported from Shkotovo, Primorsky Krai, Russia — in error, misidentification of Q. deceptor )

Quedionuchus samuraicus (Bernhauer and Schubert) : Brunke and Solodovnikov 2013 ( Quedionuchus as valid genus)

Type locality: Nikko, Japan.

Type material. Lectotype (male, BMNH) (here designated): Quedionuchus concolor Type D.S., Nikko, Lewis [handwritten card]/Type [circular label with orange border]/ Japan, G. Lewis [printed label/Sharp Coll. 1905-313 [typed label]/ SYNTYPE [circular label with blue bor- der]/AJB0001089/ Quedionuchus concolor LECTOTYPE des. Brunke 2019 [printed red label]/ Quedionuchus samuraicus Bernhauer and Schubert det. Brunke 2019 [printed white label].

Paralectotypes (2 specimens, BMNH): same as above except missing circular ‘Type’ label/AJB0001083 [printed label]/ Quedionuchus concolor PARALECTOTYPE det. Brunke 2019 [printed yellow label] (1 male, 1 female)/ Quedionuchus samuraicus Bernhauer and Schubert det. Brunke 2019 [printed white label]; Chiuzenji [= Lake Chūzenji ], 19.VIII-.24.VIII.81 [printed label]/ Japan, G. Lewis, 1910-320. [printed label]/AJB0001084 [printed label] / SYNTYPE [circular label with blue border]/ Quedionuchus concolor PARALECTOTYPE det. Brunke 2019 [printed yellow label] (sex unknown) Quedionuchus samuraicus Bernhauer and Schubert det. Brunke 2019 [printed white label].

Sharp (1888) described Q. concolor from nine specimens, from Chiuzenji (= Lake Chuzenji ) and Nikko , Japan. Three syntypes were available from the BMNH for study. Due to the possibility of an entirely dark morph of a species from the Glaber group occurring in Japan, a male syntype was therefore designated as a lectotype to prevent confusion regarding the identity of this species .

Other material. JAPAN: Honshu: Gumma Pref., Mt. Hotaka (foot), ca. 1300 m, 14–15.VIII.1980, B.M. 1980-492, P.M. Hammond, AJB0001090 (1, BMNH) ; Iwate, Iwaizumi, Hitsutori , 39.7 141.45, 790 m, 11.VIII.1991, A. Smetana (3, CNC) ; Iwate, Kawai, Yoshibezawa , 39.58 141.53, 1050 m, 12.VIII.1991, A. Smetana (1, CNC) ; Iwate, Kawai, Zaimokuzawa , 39.622 141.679, 720 m, 15.VIII.1991, A. Smetana (1, CNC) ; Tochigi, Kuriyama, Nikkosawa, Kinugawa River , 36.85 139.75, 1480 m, 22.VIII.1991 ; Yamanashi Pref., Hakuto, Sutamacho Obi, 35.76 138.42, 26.VII.2001, T. Ueno ( Barcode of Life , DNA voucher QUEDA001-18) (1, cSch) .

Diagnosis. Within the Samuraicus group, this is the only species with dark brown femora and is the only one to occur in Japan.

Redescription. Measurements ♂ (n = 5): HW/HL 1.40–1.45; PW/PL 1.06–1.10; EW/EL 1.04; ESut/PL 0.74–0.80; PW/ HW 1.04–1.06; forebody length 4.6–4.9 mm.

Measurements ♀ (n = 5): HW/HL 1.31–1.35; PW/PL 1.10–1.14; EW/EL 1.03–1.06; ESut/PL 0.73–0.78; PW/HW 1.08–1.09; forebody length 4.1–4.7 mm.

Head, pronotum and abdomen dark to very dark brown, elytra black, legs brownish, femora dark brown, tibiae lighter brown with darkened inner faces, tarsi paler, both maxillary and labial palpi light reddish brown, antennomeres, except bases, dark brown, apices of abdominal segments paler.

Head distinctly transverse, more so in males, disc with fine, dense microsculpture of transverse waves, eyes large, convex, about 2 times the length of temples; antennomeres 1–3 elongate, 4 slightly elongate to quadrate, 5 quadrate to transverse, antennomeres 6–10 increasingly transverse; pronotum slightly transverse, disc with fine, dense microsculpture of transverse waves, with three punctures in the dorsal row, though sometimes with 2 on one side; punctation of abdominal tergites sparse and moderately asperate, punctures separated by about 1.5 to 2 times puncture diameter, visible tergites 1, 1–2 or 1–3 with median impunctate area.

Male. Sternite VII not appreciably emarginate, sternite VIII with distinct, angular and moderately deep emargination, tergite X elongate triangular, apex slightly acuminate, sternite IX with broadly rounded, non-emarginate apex. Median lobe in ventral view with distinctly acuminate apex ( Fig. 5b ), in lateral view with distinct and protruding tooth, paramere swollen in lateral view and, in ventral view, expanded subapically such that it nearly or entirely reaches median lobe laterally, with peg setae arranged in two longitudinal fields 2–3 peg setae wide and extending to about level of subapical expansion of paramere ( Fig. 5d ). Male hind femora with spines slightly longer than that of female.

Female. Tergite X as in Fig. 7a .

Distribution. Known only from Honshu island, Japan. Records from the Russian Far East and South Korea ( Schülke and Smetana 2015) should be referred to Q. deceptor .

Bionomics. This species has been collected at elevations ranging from 720 to 1480 m. Some specimens were collected under the bark of Abies sp. , while others were found in an abandoned lumber yard by sifting decaying wood, bark and some mushrooms.

Comments. Although Sharp’ s Quedionuchus concolor (1888) is no longer in the same tribe as his Quedius concolor (1884) (now Cyrtoquedius, Cyrtoquediini ), the Code ( ICZN 1999) dictates that the replaced junior secondary homonym is forev- er invalid since the replacement name is currently in use (e.g., Herman 2001; Schülke and Smetana 2015). A partial barcode sequence (245 bp) was obtained from a single specimen of this species and, despite missing data, our molecular analyses corroborate the morphological evidence that Q. deceptor and Q. samuraicus are separate species ( Table 1, Fig. 1 ).

Figures

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

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. 1 Fifty percent majority rules consensus tree from an unpartitioned Bayesian phylogenetic analysis of the ‘barcoding’ region of COI. Posterior probability, ultrafast bootstrap and SH-aLRT values (from a maximum likelihood analysis) to the left of the corresponding node.