Stenus pseudomicuba Tang, Puthz & Yue

Tang, Liang, Puthz, Volker & Yue, Yan-Li, 2016, A study on the genus Stenus Latreille from Tianmushan Mountain Chain of East China (Coleoptera, Staphylinidae), Zootaxa 4171 (1), pp. 139-152 : 144-145

5. Stenus pseudomicuba Tang, Puthz & Yue , new species

( Figs. 3 , 14–19 )

Type material. Holotype. China : Zhejiang: ♂, glued on a card with labels as follows: “ China: Zhejiang Prov., Anji County, Longwangshan , Tonghanggang, 30°25'N 119°26'E, alt. 1480 m, 10.VI.2012, Hu & Yin leg.” “ Holotype / Stenus pseudomicuba / Tang, Tu & Puthz ” [red handwritten label] ( SHNU) . Paratypes. 11♂♂ 16♀♀, same data as for the holotype ( SHNU, cPut) ; 3♂♂, same data as for the holotype but Jian-Qing Zhu leg. ( SHNU) ; 16♂♂ 19♀♀, Lin’an City , West Tianmushan, alt. 1500m, 15.VIII.2010, Jia-Yao Hu leg. ( SHNU) ; 1♂, Lin’an City , West Tianmushan, alt. 1300m, 2.V.2009, Xiao-Bin Song leg. ( SHNU) ; 8♂♂ 14♀♀, Longwangshan , Qianmufeng, alt. 1300m, 24.V.2009, Feng, Liu, Yuan & Yin leg. ( SHNU) ;

Description. Brachypterous. Head black with clypeus and labrum reddish brown, pronotum reddish brown, elytra light reddish brown, abdomen brownish with last three segments darker. Antennae reddish brown, club infuscate, maxillary palpi and legs yellowish brown.

BL: 2.3–2.7mm, FL: 1.2–1.3 mm.

HW: 0.59–0.65 mm, PL: 0.42–0.47 mm, PW: 0.43–0.46 mm, EL: 0.40–0.46 mm, EW: 0.50–0.54 mm, SL: 0.28–0.33 mm.

Head 1.18–1.30 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, reaching the level of inner eye margins; punctures round, mostly well delimited, slightly confluent on median portion, similar in size except some smaller punctures at the bottom of longitudinal furrows, diameter of large punctures about as wide as apical cross section of antennal segment II; interstices at least partially reticulated, narrower than half the diameter of punctures except some along the midline of the convex median portion, which may be slightly wider. Paraglossa oval.

Pronotum 0.97–1.03 times as long as wide; disk slightly uneven, with broad median longitudinal furrow; punctures very confluent, mostly smaller than those of head; interstices reticulated and rugae-like, mostly narrower than half the diameter of punctures except those at the actual middle of longitudinal furrow, which could be as wide as twice the diameter of punctures.

Elytra 0.81–0.90 times as long as wide; disk relatively even, with postero-lateral impression more or less distinct; punctures and interstices similar to those of pronotum except the reticulation less distinct.

Legs with tarsomeres IV deeply bilobed.

Abdomen cylindrical; segments III–VI without paratergites, rudimentary lateral border present only on basal third of segment III, tergite VII without apical membranous fringe; punctures round to elliptic, becoming slightly smaller posteriad; interstices reticulated on the other tergites, mostly narrower than half the diameter of punctures on basal three tergites.

Male. Sternite VI and VII with posteriomedian portion flattened, sternite VIII ( Fig. 14 ) with shallow emargination at middle of posterior margin; sternite IX ( Fig. 15 ) with long apicolateral projections, posterior margin serrate and almost straight. Aedeagus ( Figs. 18, 19 ) slender; median lobe with sides subparallel; apical sclerotized area of median lobe short with a round apical projection; expulsion clasps large, strongly sclerotized; parameres much longer than median lobe, swollen at apical parts, each with two group setae on apico-internal margins: 3–4 setae in distal and 5–6 setae in basal.

Female. Sternite VIII slightly prominent at middle of posterior margin; spermatheca ( Fig. 16, 17 ) with basal duct strongly sclerotized, spermathecal duct sclerotized and bent twice.

Distribution. China (Zhejiang).

Remarks. The species belongs to Stenus cephalotes group and resembles S. micuba Hromádka, 1982 from Jiangsu and S. breviculus Tang, Li & Puthz, 2010 from Zhejiang, but can be distinguished from them by the lighter coloration of pronotum and different details of aedeagus, from S. breviculus also by more confluent punctation of pronotum.

Etymology. The specific name is derived from the similar appearance of Stenus micuba .

Figures

FIGURES 1 – 3. Habitus 1 Stenus tianmushanus 2 S. tonghanggangus 3 S. pseudomicuba. Scales = 1 mm.

FIGURES 14 – 19. Stenus pseudomicuba 14 male sternite VII 1 5 male sternite IX 1 6 valvifers and spermatheca 17 spermatheca 18, 19 aedeagus. Scale bars = 0.25 mm.