Stenus iustus Puthz, 1976

Lv, Wei-Xiang, Zhao, Cai-Yun & Zhou, Hong-Zhang, 2018, Ta xonomic study on the Chinese Steninae (Coleoptera, Staphylinidae), with descriptions of three new species of the Genus Stenus Latreille, Zootaxa 4429 (2), pp. 247-268: 262-264

publication ID

publication LSID

persistent identifier

treatment provided by


scientific name

Stenus iustus Puthz, 1976


6. Stenus iustus Puthz, 1976 

( Figs. 11View FIGURE 11 & 12View FIGURE 12)

Puthz, 1976: 8, 26 (subgenus Parastenus  ; Type locality: India: West Bengalen: Darjeeling District, Kurseong. Also cited from Nepal); Puthz, 1978: 131 (India); Puthz, 1980: 192 (characters; India); Herman, 2001: 2236 (catalog); Smetana, 2004: 543 (Palaearctic catalog); Puthz, 2013b:1386; Schülke & Smetana, 2015: 824 (Palaearctic catalog).

Material examined: 1 male, China: Yunnan: Tengchong County, Tongbiguan , Sanhe village , 24.VI.2016, Xiao- Yan Li leg. (IZ-CAS)  ; 4 females, Tengchong County, Tongbiguan , 26.VI.2016, Xiao-Yan Li leg. (IZ-CAS)  ; 2 females, Tengchong County, Yunfengshan , 29.VI.2016, Xiao-Yan Li leg. (IZ-CAS). 

Redescription: BL: 2.8–3.5 mm, FL: 1.8–2.0 mm, HW: 0.76–0.80 mm, PL: 0.70–0.75 mm, PW: 0.54–0.57 mm, EL: 0.76–0.80 mm, EW: 0.76–0.80 mm, SL: 0.62–0.67 mm.

Macropterous; body black with faint luster. Antennae dark brown, maxillary palpi yellowish brown, legs red brown with darker knees; clypeus black, labrum dark brown with sparse pubescent; paraglossae oval.

Head as wide as elytra. Interocular area with a pair of shallow longitudinal furrows, median portion very slightly convex, not reaching the level of inner eye margins; punctures round, mostly well delimited, the diameter of large punctures as wide as apical cross section of antennal segment II, interstices smooth and smaller than half of puncture diameter. Antennae slender, nearly reaching posterior margin of pronotum when reflexed backwards.

Pronotum markedly longer than wide; disk uneven, without distinct median longitudinal furrow; punctures on pronotum mostly fine-delimited, similar to those on head; interstices smooth and smaller than half of puncture diameter.

Elytra as long as wide; sides inflated, widest just in the middle. Elytra convex, without distinct humeral depression and postero-lateral impression; long sutural impression shallow. Punctures and interstices on elytra same as those on pronotum.

Legs with tarsomere IV deeply bilobed.

Abdomen cylindrical, tergites III –VII with broad and complete paratergites; with shallow basal furrows on anterior segments, tergite VII with apical membranous fringe; punctures round, dense, moderate to small in size and becoming slightly smaller posteriad; punctures on tergite VII distinctly larger than one dorsal eye facet, interstices three times as large as puncture diameter.

Male: sternite VIII ( Figs. 11 FView FIGURE 11 & 12 BView FIGURE 12) posteromedially with small triangular emargination; sternite IX ( Figs. 11 GView FIGURE 11 & 12 CView FIGURE 12) with long projections and irregularly strong serrate apicolaterally; tergite IX & X ( Figs. 11 HView FIGURE 11 & 12 DView FIGURE 12) entire posteriorly. Aedeagus ( Figs. 11 EView FIGURE 11 & 12 AView FIGURE 12) bulbous basally, with semi-circular apical sclerotized area. Endophallus with median bands moderately long, broad; expulsion clasps each other, each clasp pointed anteriorly; copulatory tube long, thick, baculiform, narrowed apically. Parameres distinctly longer than median lobe, each bulbous at apical parts, with 12–14 setae on apico-mesial margins.

Female: sternite VIII ( Figs. 11 IView FIGURE 11 & 12 EView FIGURE 12) weakly pointed posteromedially; Gonocoxite ( Figs. 11 JView FIGURE 11 & 12 FView FIGURE 12) with strong serrate apicolaterally; tergite IX & X ( Figs. 11 HView FIGURE 11 & 12 GView FIGURE 12) rounded apically; sclerotized spermatheca ( Figs. 11 LView FIGURE 11 & 12 HView FIGURE 12) with a large and round infundibulum.

Distribution. China (Yunnan), India, Nepal.

Remarks. This species belongs to Stenus virgula  group and is the new record to China.