Stenus mangdangshanus Liu, Tang & Luo, 2018

Liu, Sheng-Nan, Tang, Liang & Luo, Yong-Ting, 2018, The Stenus cirrus group (Coleoptera, Staphylinidae) in Fujian, East China, Zootaxa 4375 (1), pp. 105-115 : 106-107

Stenus mangdangshanus Liu, Tang & Luo , new species

( Figs 1, 2 , 11–14 )

Material examined. CHINA: Fujian Prov. : Holotype: ♂, glued on a card with labels as follows: “ China Fujian Prov. , Nanping City, Mangdangshan Mt., mixed forest, leaf litter, sifted, alt. 300–1300 m, 8.XI.2015, Yan & Tang leg”. “ Holotype / Stenus mangdangshanus / Liu, Tang & Luo ” [red handwritten label] ( SHNU) . Paratypes: 1♂, same data as for the holotype. ( SHNU) ; 1♂, same data as for the holotype, but alt. 400 m, 10.XI.2015. ( SHNU).

Description. Brachypterous; head blackish, pronotum and abdomen dark brown, elytra dark brown, each with an indistinct spot on median portion. Antennae, maxillary palpi and legs yellowish brown except antennal club infuscate. Labrum reddish brown.

BL: 3.5–3.7 mm, FL: 1.6–1.7 mm.

HW: 0.72–0.74 mm, PL: 0.54–0.57 mm, PW: 0.52–0.53 mm, EL: 0.58–0.59 mm, EW: 0.63–0.65 mm, SL: 0.43–0.47 mm.

Head 1.13–1.18 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 on median portion than those near inner margins of eyes, diameter of large punctures about as wide as apical cross section of antennal segment II; interstices smooth, mostly narrower than half the diameter of punctures except those along the midline of the median portion, which may be wider than the diameter of punctures. Paraglossae oval.

Pronotum 1.04–1.07 times as long as wide; disk relatively even, without distinct median longitudinal furrow; punctures round, slightly confluent, about the same size to large punctures of head; interstices smooth, much narrower than half the diameter of punctures.

Elytra 0.91–0.92 times as long as wide; disk even; punctures round to elliptic, moderately confluent, slightly larger than those on pronotum; interstices smooth, distinctly smaller 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 apical membranous fringe; punctation of tergites III–VIII sparse and shallow, gradually becoming smaller posteriad; interstices smooth, mostly wider than diameter of punctures except those on basal impressions of tergites III–V, which may be distinctly narrower than half the diameter of punctures.

Male. Sternite VII with inconspicuous emargination at middle of posterior margin; Sternite VIII ( Fig. 11 ) with shallow emargination at middle of posterior margin; sternite IX ( Fig. 12 ) with long apicolateral projections, posterior margin serrate. Aedeagus ( Figs. 13–14 ) with apical sclerotized portion triangular; sclerotized expulsion clasps medium in size, median longitudinal bands with ventral bands each long, narrow, lateral longitudinal bands short; copulatory tube very long, rather slender, with main tube and basal chamber submembranous, the main tube gradually narrowing toward apex; parameres slightly longer than median lobe, swollen at apical parts, each with 11–13 setae on apico-internal margins.

Female. Unknown.

Distribution. China (Fujian).

Remarks. The new species is similar to S. cooterianus Puthz, 2003 from Fujian, but can be easily distinguished from the latter species by the denser punctation of pronotum and elytra, the indistinct elytral spots and different sexual characters.

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

Figures

FIGURES 1–2. Stenus mangdangshanus. Scale bars:1mm.

FIGURES 11–14. Stenus mangdangshanus. 11 male sternite VIII, 12 male sternite IX, 13, 14 aedeagus. Scale bars:0.25 mm.