Stenus taiyangshanus Tang & Li
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|Stenus taiyangshanus Tang & Li|
Holotype. China: Guangdong: male, glued on a card with labels as follows:"China: Guangdong Prov., Longmen County, Taiyangshan Mt., 16.VIII.2010, Liang Tang leg." "Holotype / Stenus taiyangshanus / Tang & Li" [red handwritten label] (SHNU). Paratype. 1 female, same data as for the holotype (SHNU).
Brachypterous; body blackish, anterior margin of labrum, antennae, maxillary palpi and legs yellowish brown, each elytron with a vague elongate orange spot near lateral side.
BL: 3.8mm (the length of the immature female paratype with strongly contracted abdomen is not included); FL: 1.8 mm.
HW: 0.78-0.83 mm, PL: 0.62-0.67 mm, PW: 0.56-0.60 mm, EL: 0.64-0.67 mm, EW: 0.64-0.71 mm, SL: 0.45-0.48 mm.
Head 1.17-1.23 times as wide as elytra; interocular area with deep longitudinal furrows, median portion convex, slightly extending beyond the level of inner eye margins; punctures round, partly confluent, slightly larger and sparser on median area than those near inner margins of eyes, diameter of large punctures about as wide as basal cross section of antennal segment II; interstices faintly reticulated, much smaller than half the diameter of punctures except those on vertex and behind basiantennal tubercles, which may be much larger. Antennae, when reflexed, extending a little after posterior margin of pronotum; relative length of antennal segments from base to apex as 11: 7: 16: 8.5: 10: 7.5: 7: 5: 5.5: 5.5: 9. Paraglossa oval.
Pronotum 1.10-1.12 times as long as wide; disk slightly uneven, with distinct median longitudinal furrow, two indistinct impressions in anterior half, indistinct transverse impression in the middle, and two indistinct impressions in posterior half; punctures moderately rugose and confluent, of similar size as those of head; interstices, especially those on the bottom of median longitudinal furrow distinctly reticulated, more or less smaller than half the diameter of punctures except those on the bottom of median longitudinal furrow, which may be larger.
Elytra 0.95-1.01 times as long as wide, distinctly constricted at base, lateral margins with slight concavity at about half, gently divergent posteriad; disk slightly uneven with shallow longitudinal humeral impression, shallow postero-lateral impression and shallow sutural impression, suture moderately convex; punctation and interstices similar to those of pronotum.
Hind tarsi 0.7 times as long as hind tibiae, tarsomeres IV distinctly bilobed.
Abdomen cylindrical; distinct paratergites absent, but rudimentary lateral border present; tergite VII with palisade fringe; punctures on abdominal tergites III–VIII round to elliptic, gradually becoming smaller posteriad; interstices smaller to little larger than half the diameter of punctures, with relatively faint microsculpture throughout abdominal tergites.
Male. Sternite VII with posteromedian portion slightly flattened; sternite VIII (Fig. 33) with shallow emargination at middle of posterior margin; sternite IX(Fig. 34) with very long apicolateral projections, posterior margin serrate; tergite X (Fig. 35) with posterior margin slightly emarginated. Aedeagus (Figs 36, 37) robust, with setae at sclerotized apex of median lobe; expulsion hooks (Fig. 39) large; parameres extending distinctly beyond apex of median lobe, bisinuate, folded at apical fifth, with 21 setae on inner side (Fig. 38).
Female. Abdomen broader than that in male; sternite VIII inconspicuously prominent at the middle of posterior margin; tergite X slightly emarginated at posterior margin; sclerotized spermatheca can’t be observed in immature female and thus it can’t be illustrated here.
China (Guangdong Province: Mt. Taiyang Shan).
This new species can be easily distinguished from related species by vague undelimited elytral spots and small body size.
The specific name is derived from “Taiyangshan”, the type locality of this species.
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