Stenus lianhuashanus Liu and Tang

Liu, Sheng-Nan & Tang, Liang, 2017, Seven new species of the Stenus cirrus group (Coleoptera, Staphylinidae) from Guangxi, South China, Zootaxa 4268 (2), pp. 238-254 : 247-248

Stenus lianhuashanus Liu and Tang , new species

( Figs 11, 12 , 54–58 )

Type material. CHINA: Guangxi: Holotype: ♂, Jinxiu County, Lianhua Shan , 24°09'35''N 110°07'05''E, pine forest, mixed leaf litter, humus, sifted, 1080m, 14.VII.2014, Peng, Song, Yu & Yan leg. ( SHNU).

Description. Brachypterous; body blackish, Labrum reddish brown, each elytron with a large elongate yellow spot near lateral margin, which is about 4/5 as long as and 2/3 as broad as the respective elytron. Antennae, maxillary palpi and legs reddish yellow except antennal club infuscate.

BL: 7.9 mm, FL: 2.9 mm.

HW: 1.12 mm, PL: 0.93 mm, PW: 0.84 mm, EL: 1.06 mm, EW: 1.07 mm, SL: 0.80 mm.

Head 1.05 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, slightly extending beyond the level of inner eye margins; punctures round, slightly larger and sparser in median portion than near inner margins of eyes, diameter of large punctures slightly larger than apical cross section of antennal segment II; interstices smooth, narrower than half to entire diameter of punctures except those along the midline of the posterior median portion, which may be as wide as diameter of punctures. Paraglossae oval.

Pronotum 1.10 times as long as wide; disk uneven, with shallow median longitudinal furrow which is a about 2/3 the length of pronotum, two shallow impressions in anterior half each with an small outer tubercle, two transverse impressions in about middle, two impressions in posterior half each with a larger outer tubercle; punctures confluent, slightly smaller than those of head; interstices smooth, much narrower than half the diameter of punctures except for those at the bottom of the median longitudinal furrow, which could be larger.

Elytra 0.99 times as long as wide; disk uneven, each elytron with a humeral impression; punctures round, more or less confluent especially those on elytral spots, slightly larger than those on pronotum; interstices smooth, distinctly narrower than half the diameter of punctures.

Legs with tarsomeres IV strongly bilobed.

Abdomen cylindrical; paratergites very narrow and almost impunctate, present only in segment III, tergites and sternites totally fused in segments IV–VI, posterior margin of tergite VII with indistinct palisade fringe; punctation of tergite III moderately dense and deep, of the rest tergites sparse and shallow, gradually becoming smaller and sparser posteriad; interstices smooth, narrower to slightly wider than diameter of punctures on tergite III, mostly larger than diameter of punctures on the rest tergites.

Male. Sternite VIII ( Fig. 54 ) with shallow emargination at middle of posterior margin; sternite IX ( Fig. 56 ) with long apicolateral projections, posterior margin serrate; tergite X ( Fig. 55 ) with posterior margin truncate. Aedeagus ( Fig. 57 ) apical sclerotized portion roundly projected at apex; expulsion clasps large; parameres straight, distinctly longer than median lobe, each with 12 setae on apico-internal margins.

Female. Unknown.

Distribution. China (Guangxi).

Remarks. This new species is the largest species in the group, apparently it is similar to S. hujiayaoi sp. n. from Guangxi, but can be distinguished from the latter by the larger body size, the sparse punctation of head, the more distinct pronotal furrow the larger elytral spot, the sparser and shallower punctation of abdominal tergites and different sexual characters.

Etymology. The specific name is derived from the type locality of this species.

Figures

FIGURES 11 – 12. Dorsal habitus of Stenus lianhuashanus sp. n. Scale bars: 1 mm.

FIGURES 54 – 58. Diagnostic features of Stenus lianhuashanus. 54. Male sternite VIII. 55. Male tergites IX – X. 56. Male sternite IX. 57 – 58. Aedeagus, in dorsal view. Scale bars: 0.25 mm.