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 : 264-266

4. Quedius (Ve l le iu s) circumipectus ( Cho 1996)

( Fig. 8 ).

Cho 1996: 115 (Type locality: Korea: Chugchungnam-do, Kumsan-gun, Poseoksa Temple).

Redescription. Body length about 18.0 mm, body width 4.5 mm (EW), HW/PW/EW/AW = 1.0:1.6:1.6:1.4, HL/ PL/EL = 1.0:1.5:1.9.

Head dark reddish-brown, nearly black; pronotum reddish-brown; elytra dark brown with humeri yellowish; abdomen dark brown; antennae dark brown with last segment paler; maxillary and labial palpi dark brown with apex of each segment paler and both last segment reddish-brown.

Head subquadrate, wider than long, HW/HL = 1.0:0.8, eyes large, longer than tempora in dorsal view, HEL/ HTL = 1.0:0.7; posterior setiferous puncture positioned behind level of posterior edge of eye and about 1 diameter of puncture separated from posteromedial edge of eye; 1 basal setiferous puncture on each side, temporal setiferous puncture about equally far from posterior edge of eye and nuchal constriction; 1 oblique narrow depression behind each insertion of antenna, dorsal surface covered with sparse fine punctures and very dense microsculpture consisting of isodiametrical meshes.

Antennae with apex of segment III wider than that of segment I, segments V–X each very shallowly bifurcated, segment IV even not bifurcated, segment III longer than segment II, last segment about as long as 2 preceding segments combined.

Left mandible ( Fig. 8 E) with anterior tooth divided into two subteeth about equally sized, edge before anterior tooth smoothly curved, posterior tooth absent, right mandible ( Fig. 7 E) with three teeth.

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

Labial palpus with last segment lacking seta and fusiform, surface covered with many pores especially on apical half, all 3 segments about equally long.

Neck surface covered with dense microsculpture consisting of more transverse meshes than those on head.

Pronotum wider than long, PW/PL = 1.0:0.7; two setiferous punctures in each dorsal row, each puncture accompanied with one additional smaller setiferous puncture, one setiferous puncture in each sublateral row (two additional smaller punctures before the large puncture on left side), large lateral setiferous puncture behind dorsal row and sublateral row; surface covered with dense microsculpture similar to that on head on anteromedial portion and gradually becoming vague and more transverse towards lateral and posterior margin.

Scutellum densely setose and covered with dense transverse microsculpture, anterior basal ridge with middle portion nearly straight, posterior basal ridge slightly arced backward.

Elytra. EW/EL = 1.0:0.8, EL/ESL = 1.0:0.5, evenly and densely setose, surface between setae covered with dense micropunctures.

Abdomen with each tergite bearing dense setae gradually becoming sparser towards apex, tergites III–VII 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, apical half bearing many large black setae; sternite IX ( Fig. 8 G) with basal portion narrow and not very long, apical portion slender, with a small emargination on apical margin, surface from widest portion to apex covered with dense setae gradually becoming larger towards apex; tergite X with basal side smoothly concaved, apex angulate, surface of apical 1/3 covered with some long setae; aedeagus in lateral view ( Fig. 8 A) with apex of paramere protruding slightly beyond apex of median lobe, median lobe with a hook facing paramere not far below apex and below lateral setae of paramere, in dorsal view ( Fig. 8 B) with apex of paramere split into two branches by a very narrow middle suture, the two branches adjacent to each other, paramere about equally wide as median lobe through the whole length, median lobe with apex very small ( Fig. 8 D), 2 apical and 2 lateral setae on each side of paramere ( Fig. 8 C), underside of paramere covered with many sensory peg setae distributed downwards basal to insertion of lateral setae.

Female. Unknown at present.

Type material. Holotype, male, Korea, Chunchungnam-do, Kumsan-gun, Poseoksa Temple, 27.VI.1986, collected by J. S. Lee, deposited in HNUNM.

Comparison. Quedius (Velleius) circumipectus is very similar to Q. (V.) dilatatus , but the subcircular head is obviously different from the latter.

Distribution. At present Quedius (Velleius) circumipectus is known only from it type locality in Korean.

Figures

FIGURE 8. Q. (V.) circumipectus. 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 dorsal view; E – F, mandibles, dorsal view; G, male abdominal sternite IX; H, male abdominal tergite X. Scales = 0.5 mm.

FIGURE 7. Q. (V.) amamiensis. A – C, aedeagus, (A) lateral view, (B) dorsal view, (C) underside of paramere, showing sensory peg setae; D – E, mandibles, dorsal view. Scales = 0.5 mm.