Quedius

Zhao, Zong-Yi & Zhou, Hong-Zhang, 2015, Phylogeny and taxonomic revision of the subgenus Velleius Leach (Coleoptera: Staphylinidae: Staphylininae), Zootaxa 3957 (3), pp. 251-276 : 268-270

6. Quedius (Ve l le iu s) elongatus ( Naomi 1986)

( Fig. 10 ).

Naomi 1986: 244 (originally in Velleius ; Type locality: Mt. Gori, Hiroshima Pref.); Watanabe 1990: 67.

Redescription. Body length about 10.0 mm, body width about 2.6 mm (EW), HW/PW/EW/AW = 1.0:1.4:1.6:1.4, HL/PL/EL = 1.0:1.5:2.0.

Body entirely pale reddish-brown (including antennae and legs), hypomera of elytra yellowish.

Head subcircular, wider than long, HW/HL = 1.0:0.8, eyes large, in dorsal view longer than tempora, HEL/ HTL = 1.0:0.40; posterior frontal setiferous puncture before posterior edge of eye and adjacent to eye, two basal setiferous punctures on each side with the outer one much smaller than the inner one and both very close to nuchal constriction, temporal setiferous puncture about equally distant from posterior edge of eye and from nuchal constriction; no oblique fovea behind insertion of each antenna, dorsal surface covered with sparse fine punctures and dense microsculpture, meshes of microsculpture isodiametric on anterior portion but gradually becoming transverse on posterior portion of head.

Antennae with apex of segment III obviously wider than apex of segment I, segments IV and X each moderately, segments V–IX each deeply bifurcated, segment III slightly longer than segment II, last segment slightly longer than 2 preceding segments combined.

Left mandible ( Fig. 10 D) with anterior tooth not divided into subteeth, edge before anterior tooth smoothly curved, posterior tooth present with notch before it not very deep, right mandible ( Fig. 10 E) with only one tooth.

Maxillary palpus with last segment lacking seta and somewhat fusiform, outer surface of basal half covered with many longitudinal foveae and surface of apical half covered with many fine pores, ratio of segments II–IV 1.0:0.6:1.1.

Labial palpus with last segment lacking seta and strongly dilated to globose, apical portion covered with many pores, segment II with apex much wider than base, apex with sensory organ well developed, ratio of segments I–III 1.0:1.0:1.5.

Neck surface covered with microsculpture consisting of transverse meshes.

Pronotum wider than long, PW/PL = 1.0:0.8; one setiferous punctures in each dorsal row and far from anterior side, two large setiferous punctures in each sublateral row with the anterior one before and posterior one after level of puncture in dorsal row large lateral setiferous puncture at about same level of puncture in dorsal row; surface covered with very vague and hardly appreciable but dense transverse microsculpture.

Scutellum densely setose, surface between setae covered with dense transverse microsculpture, anterior basal ridge with middle portion angled backward and broken, posterior basal ridge slightly arced forward.

Elytra slightly wider than long, EW/EL = 1.0:0.9, EL/ESL = 1.0:0.6, surface evenly and densely setose, surface between setae smooth and without miropuncture.

Abdomen with each tergite densely and evenly setose, tergites III–IV lacking and tergites VI–VII bearing large middle lateral setae, tergite VII bearing whitish apical fringe, tergite VIII bearing many large black setae on apical half.

Apices of meso- and metatarsomere V not dilated.

Male. Tergite VIII bearing many large black setae on apical half, apical margin with a middle emargination, a small area before it glabrous; sternite IX ( Fig. 10 F) with basal portion slender and not very long, apical portion with a small emargination on apical margin, surface from widest portion to apex covered with dense setae gradually becoming slightly larger towards apex; tergite X ( Fig. 10 G) with basal edge broadly arcuated backwards, apical portion nearly triangle-shaped, apex obtuse, apical 1/2 covered with many large setae and a few smaller setae; aedeagus in lateral view ( Fig. 10 A) with apex of paramere not protruding beyond that of median lobe, the former bent towards median lobe, paramere not suddenly widened below apex, median lobe with an apical hook facing paramere and concave below the hook, in dorsal view ( Fig. 10 B) paramere narrower than median lobe through whole length, paramere from apex to base slightly widened, median lobe from apex to base first slightly widened and then slightly narrowed near base, apical portion of paramere ( Fig. 10 C) not divided into two branches but just with a small emargination at apical margin, 2 apical and 2 lateral setae on each side, sensory peg setae on underside of paramere forming one irregular apical group consisting of 17 setae and extending from apex downward slightly beyond insertions of lateral setae.

Female. Unknown at present.

Type material. Holotype, male, Japan, Hiroshima Prefecture, Gori Mountain, 22.VII.1979, collected by H. Aramaki, deposited in ELFAKU.

Comparison. Quedius (Velleius) elongatus can be very easily recognized by the body color which is much paler than in other species of Velleius .

Distribution. Quedius (Vell eius) elongatus is at present known only from its type locality in Japan.

Figures

FIGURE 10. Q. (V.) elongatus. A – C, aedeagus, (A) lateral view, (B) dorsal view, (C) underside of paramere, showing sensory peg setae; D – E, mandibles, dorsal view; F, male abdominal sternite IX; G, male abdominal tergite X. Scales = 0.5 mm.