Quedius rectilatus, Zhao, Zong-Yi & Zhou, Hong-Zhang, 2015

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 : 260-261

1. Quedius (Ve l le iu s) rectilatus sp. nov.

( Fig. 5 ).

Description. Body length about 14.0 mm, body width 3.0 mm (EW), HW/PW/EW/AW = 1.0:1.4:1.5:1.4, HL/PL/ EL = 1.0:1.4:1.9.

Body entirely dark brown, head nearly black, hypomera of elytra from humeri to apices yellowish, pronotum and abdomen iridescent.

Head subquadrate, wider than long, HW/HL = 1.0:0.8, eyes large, in dorsal view longer than tempora, HEL/ HTL = 1.0:0.4; posterior frontal setiferous puncture positioned before posterior edge of eye and adjacent to eye, two basal setiferous punctures on each side with the outer one smaller than the inner one, temporal setiferous puncture about equally distant to posterior edge of eye and to nuchal constriction; no oblique fovea behind insertion of each antenna, dorsal surface covered with sparse fine punctures and dense microsculpture, the meshes of microsculpture isodiametric on anterior portion, but transverse on posterior portion of head.

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

Left mandible ( Fig. 5 F) 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. 5 G) only with one tooth.

Maxillary palpus with last segment lacking setae and nearly fusiform, surface of basal half covered with many longitudinal foveae and of apical half covered with many fine pores, ratio of length of segments II–IV as 1.0:0.8:1.3.

Labial palpus with last segment lacking setae and strongly dilated to globose, much wider than penultimate segment, surface covered with many fine pores and apex with developed sensory organ, ratio of length of segments I–III as 1.0:1.0:2.2.

Neck surface covered with microsculpture consisting of transverse meshes, and also covered with fine punctures sparser than those on head.

Pronotum wider than long, PW/PL = 1.0:0.8; one setiferous puncture in each dorsal row, two setiferous punctures in each sublateral row, large lateral setiferous puncture positioned before posterior puncture in sublateral row; surface covered with very vague but dense transverse microsculpture.

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

Elytra slightly wider than long, EW/EL = 1.0:0.8, EL/ESL = 1.0:0.6; surface evenly and densely setose, surface between setae smooth and without micropunctures.

Abdomen with each tergite densely setose, setae gradually becoming sparser towards apex; tergites III–IV lacking and tergites V–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 without any setae; sternite IX ( Fig. 5 D) with basal portion very slender and long, apical margin with a deep emargination, surface from widest portion to apex covered with dense setae gradually becoming slightly larger towards apex; tergite X ( Fig. 5 E) with basal edge deeply arcuate backwards, apical portion round, not obviously triangle-shaped, apex obtuse, apical 1/2 covered with many large setae and a few smaller setae; aedeagus in lateral view ( Fig. 5 A) with apex of paramere not protruding beyond that of median lobe, the former slightly bent towards the latter, paramere gradually widened below apex, median lobe with an apical hook facing paramere, concave below the hook, in dorsal view ( Fig. 5 B) paramere narrower than median lobe through whole length, paramere gradually narrowed from base to apex, median lobe with apex small and then gradually and slightly widened basad, apical portion of paramere ( Fig. 5 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 group consisting of 14 setae and extending from apex just to insertions of lateral setae, one additional peg setae below the group on one side.

Female. Unknown at present.

Type material. Holotype male, China, Guangdong Province, Nanling Mountain, IV–VIII. 2009, collected by Gao Lei, deposited in IZ-CAS.

Etymology. The species name is a combination of Latin words recti - (meaning straight) and latus (meaning side) referring to the shape of aedeagus paramere.

Comparison. This new species is similar to Quedius (Velleius) japonicus and the next new species. But it is less robust, especially the head and pronotum obviously narrower, and it is different from them in the characters mentioned in the key. It is also similar to Q. (V.) elongatus but with darker color and different male genital characters.

Distribution. At present this new species is known only from Nanling Mountain in Guangdong Province of China.

Figures

FIGURE 5. Q. (V.) rectilatus. A – C, aedeagus. (A) lateral view, (B) dorsal view, (C) underside of paramere, showing sensory peg setae, (D) male abdominal sternite IX; E, male abdominal tergite X; F – G, mandibles, dorsal view, VS = ventral sclerite. Scales = 0.5 mm.