Erymus sinicus Bordoni, 2009

Zhou, Yu-Lingzi & Zhou, Hong-Zhang, 2014, Taxonomy of the genus Erymus Bordoni (Coleoptera: Staphylinidae, Staphylininae, Xantholinini) in China with descriptions of two new species, Zootaxa 3814 (4), pp. 521-536 : 534-535

6. Erymus sinicus Bordoni, 2009

( Fig. 2 C)

Bordoni, 2009: 88

(Type locality: China, Fujian, Wuyi Shan, Nat. Res., Sangen env., 900 m).

Material examined: male: “ HOLOTYPUS, Erymus , sinicus sp. n., Bordoni det. 2005 ”/ “ CHINA: FUJIAN prov, Wuyi Shan Nat. Res , Sangan env. (900m), 30.v.-2.vi.2001, Hlaváč & Cooter lgt”. ( CJ)

Description. Measurements. BL= 4.20 mm, FL= 2.43 mm, HL= 0.68 mm, HW= 0.58 mm, PL= 0.82 mm, PW= 0.53 mm, EL= 0.80mm, EW= 0.73 mm.

Body nearly cylindrical, small-sized. Body dark brown, except head and abdomen darker, last abdominal segment and legs yellowish brown.

Head ( Fig. 2 C). Subrectangular (HL to HW ratio 1.2), widest at mid-length of eyes, lateral margin substraight, posterior angles rounded. Dorsal integument extensively bearing micropunctures, without any microsculpture, median longitudinal region (of the width 0.15 mm) smooth, without punctures, other surface (posterior half of head and temporal region) with deep and large punctures, distance between punctures about two punctures’ diameter; deflexed portion of tempora with 2–3 rows of punctures. Each side of cranium with anterolateral puncture near antennal insertion, midlateral puncture adjacent to dorsal margin of eye. Frontal furrows deep and long, fused with two paired tiny punctures, arriving line connecting midth of each eye. Anteocular furrows indistinct. Eyes large, longer than half length of tempora (eye: tempora = 0.20: 0.37 mm), distinctly protruding laterad. Epistoma subrectangular, surface flattened. Distance between antennal insertions 0.19 mm, longer than distance from antenna to eye (0.12 mm).

Antennae. Scape stout, thickened apically, longer than length of three subsequent antennomeres combined, 0.26 mm; antennomere II elongate, 0.10 mm; III subspherical, much shorter than II, 0.07 mm; IV and V slightly wider than III, subequal in length of 0.06 mm; last antennomere medium in length, 0.14 mm, longer than length of two preceding antennomeres combined.

Neck. Medium width (0.22 mm), slightly wider than 1/3 of head width.

Pronotum ( Fig. 2 C). Subrectangular, distinctly elongate (PL to PW ratio 1.6), distinctly longer and narrower than head. Widened anteriad, lateral margins quite sinuate, anterior angles obviously expanded outwards, posterior angles broadly rounded, with widest at anterior 1/4 and narrowest at posterior 1/4. Dorsal surface extensively bearing micropunctures, without any microsculpture. Each side bearing a pair of admedian row of 6–7 small punctures, a pair of lateral row of 6–7 punctures, and also with few irregular punctures distributing near anterior margin.

Mesoscutellum. Glossy, covered with quite shallow microstriae, and with a pair of small punctures at apical 1/ 3.

Elytra ( Fig. 2 C). Subquadrate (EL to EW ratio 1.1), slightly shorter than pronotum, but distinctly wider. Humeri well-developed, lateral margins slightly dilated outwards, hind margin distinctly rounded. Integument glossy, flattened, without microsculpture, each side with 2–3 rows of small punctures along median suture, a row along midwidth, and also with 1–2 rows of tiny punctures.

Abdomen. Cylindrical, broadest at segment VI. Tergites III–VII glossy, each segment covered with obvious transverse microstriae, also with small scattered punctures, interspaces between punctures approximately the diameter of 2–3 punctures, and punctures slightly denser on tergites VI and VII. Each tergite with a shallow basal impression near anterior margin; surface between two basal transverse carinae glossy, also covered with microstriae, and rarely with tiny punctures. All abdominal sternites glossy, with microstriae and punctures as those on tergites.

Distribution. China (Fujian).

Remarks. This species is distinguished from its congeners by the combination of the following characters: body color, distance between punctures on head, male sternite IX and basal bulb of aedeagus.

Figures

FIGURE 2. Forebody: A. Erymus gracilis (Fauvel); B. E. paramerum Bordoni; C. E. sinicus Bordoni. Scale bars 0.30 mm.