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 : 273-275

9. Quedius (Ve l le iu s) setosus ( Sharp 1889)

( Fig. 13 ).

Sharp 1889: 29 (originally in Velleius ; Type locality: Japan: Junsai); Naomi 1986: 243; Watanabe 1990: 65; Cho 1996: 116; Zhou 1999: 121.

Redescription. Body length about 19.0 mm, body width about 4.6 mm (EW), HW/PW/EW/AW = 1.0:1.4:1.6:1.3, HL/PL/EL = 1.0:1.4:1.7.

Body entirely very dark brown, pronotum iridescent, hypomeron of elytra yellowish.

Head nearly quadrate, wider than long, HW/HL = 1.0:0.8, eyes large, in dorsal view longer than tempora, HEL/HTL = 1.0:0.7; posterior frontal setiferous puncture behind level of posterior edge of eye and separated from posteromedian edge of eye by about two diameters of puncture, one basal setiferous puncture on each side and much smaller than posterior frontal setiferous puncture, temporal setiferous puncture closer to nuchal constriction than to posterior edge of eye; one oblique narrow depression just behind insertion of antenna on each side, dorsal surface covered with sparse fine punctures and dense microsculpture consisting of isodiametric meshes.

Antennae with apex of segment III about equal wide to segment I, segment IV shallowly, segments V–X each deeply bifurcated, segment III longer than segment II, last segment longer than 2 but shorter than 3 preceding segments combined.

Left mandible ( Fig. 13 E) with anterior tooth divided into two subteeth with posterior one larger, edge before anterior tooth smoothly curved, posterior tooth absent, right mandible ( Fig. 13 F) with two teeth.

Maxillary palpus with last segment nearly parallel-sided and lacking seta, surface covered with many longitudinal foveae on basal half and with many pores on apical half, ratio of length of segments II–IV 1.0:0.8:1.1.

Labial palpus with last segment fusiform and lacking seta, surface covered with many pores on apical portion, ratio of length of segments I–III 1.0:1.0:1.2.

Neck covered with dense microsculpture consisting meshes more transverse than those on head, and also covered with sparse fine punctures.

Pronotum wider than long, PW/PL = 1.0:0.8; two large setiferous punctures in each dorsal row, sometimes additional small puncture accompanying around, one large setiferous puncture in each sublateral row, large lateral setiferous puncture behind level of sublateral row but before posterior puncture in dorsal row; surface covered with dense but very vague transverse microsculpture, also covered with sparse fine punctures.

Scutellum setose, surface covered with very vague transverse microsculpture, anterior basal ridge with middle portion nearly straight, posterior basal ridge slightly arced backward.

Elytra. EW/EL = 1.0:0.9, EL/ESL = 1.0:0.5, surface evenly and densely setose, surface between setae covered with dense micropunctures.

Abdomen with each tergite evenly setose, tergites III–VII all bearing one large middle lateral setae on each side, tergite VII bearing whitish apical fringe.

Apices of meso- and metatarsomere V dilated.

Male. Sternite VIII with a middle emargination on apical margin, a small area before it glabrous; sternite IX ( Fig. 13 G) with basal portion very slender and short, apical portion without emargination on apical margin, surface from widest portion to apex covered with dense setiferous punctures, several larger setae on apical margin; tergite X ( Fig. 13 H) with basal edge arcuated backwards, apical portion nearly triangle-shaped, apex obtuse but not truncated, surface of apical 1/3 bearing many large setae; aedeagus in lateral view ( Fig. 13 A) with apex of paramere protruding slightly beyond apex of median lobe, paramere nearly equally wide through whole length, not suddenly widened below apex, median lobe with a hook facing paramere below apex and concave below the hook ( Fig. 13 D), in dorsal view ( Fig. 13 B) paramere wider than median lobe through whole length, paramere slightly dilated at about apical 1/3, apical portion of paramere ( Fig. 13 C) divided into two branches separated from each other, 2 apical and 2 smaller lateral setae on each side, sensory peg setae on underside of paramere forming two groups extending from apex towards base and beyond insertions of lateral setae, 14 or 15 sensory peg setae in each group.

Female. Sternite IX ( Fig. 13 I) bearing several large apical setae; tergite X ( Fig. 13 J) with basal side broadly and smoothly concaved, apical portion trilobed, the two lateral lobes smaller than the middle lobe, several large setae on and before apical margin of middle lobe, apex obtuse but not truncate.

Type material. Holotype, male, Japan, collected by G. Lewis, deposited in NHM.

Specimens examined. 1 male, 1 female, China, Hubei Province, Xingshan, Longmenhe, 1350m, 20.VII.1993, collected by Yang Xingke, deposited in IZ-CAS.

Comparison. Quedius (Velleius) setosus is similar to Q. (V.) pectinatus , but its last antennal segment is obviously shorter than preceding three segments combined. It is also similar to Q. (V.) dilatatus and Q. (V.) circumipectus , but with much deeper bifurcated antennal segments IV–X.

Distribution. Quedius (Vell eius) setosus is known from China (Hubei), Korea and Japan.

Figures

FIGURE 13. Q. (V.) setosus. A – D, aedeagus, (A) lateral view, (B) dorsal view, (C) underside of paramere apex, showing sensory peg setae, (D) apical portion of median lobe in lateral view; E – F, mandibles, dorsal view; G, male abdominal sternite IX; H, male abdominal tergite X; I, female sternite IX, right part; J, female abdominal tergite X. Scales = 0.5 mm.