Scaphisoma tienmuschanum, Löbl, 2023

Löbl, Ivan, 2023, New species and records of Scaphidiinae (Coleoptera: Staphylinidae) from mainland China and Taiwan, Vernate 42, pp. 135-142 : 140-141

Scaphisoma tienmuschanum sp. nov.

Holotype male: CHINA: ZHEJIANG PROV. Lin’an County, West Tianmushan Nat. Res. 30.3255°N 119.4406°E, J. Hájek & J. Růžička leg. / ( WTO3 ) 24.vi.2017 430 m, sift #02 large bamboo bushes above Chanyuan temple ( NMPC).

Description. Length 1.35 mm, width 0.90 mm. Head and most of body dark reddish-brown, apex of abdomen light brown to yellowish, legs rufous, antennomeres I to IV yellowish, following antennomeres light brown. Length/width ratios of antennomeres: III 13/7: IV 24/5: V 29/6: VI 33/7: VII 39/12: VIII 33/10: IX 42/11: X 43/12: XI 43/12. Pronotum and elytra lacking microsculpture. Pronotum with lateral margins slightly arcuate; lateral margin carina concealed in dorsal view, impunctate; discal punctation sparse and very fine, visible at 50 times magnification. Minute tip of scutellum exposed. Elytron strongly narrowing apicad, with lateral margin arcuate, lateral margin stria concealed in dorsal view, impunctate; apical margin weakly rounded, lacking distinct crenulation; inner apical angle situated in level of outer angle; sutural margin not raised; sutural carina moderately deep, parallel, starting at each side of pronotal lobe, not extending along base; adsutural area flat, ca. 0.05 mm wide shortly posteriad of scutellar tip, with single, dense puncture row; punctation near bases rather fine, much coarser than pronotal punctation, becoming denser and coarser apicad, with puncture intervals mostly about two to three times as large as puncture diameters on apical half of disc. Hind wings fully developed. Hypomeron smooth. Mesanepisternum very finely and sparsely punctate. Mesoventrite with few fine punctures in middle, densely and rather coarsely punctate along lateral margins. Mesepimeron about 3 times as long as wide and as long as interval between its tip and mesocoxa. Metaventrite lacking microsculpture, nearly flat in middle, lacking impressions, with punctation rather coarse and conspicuously dense on apicomedian area, distinct at 40 times magnification, becoming sparse and very fine anteriad and laterad; antecoxal puncture rows absent; submesocoxal areas ca. 0.04 mm long, nearly as long as third of shortest interval between its margin and metacoxa; submesocoxal lines convex, finely punctate. Metanepisternum lacking microsculpture, convex, narrowing anteriad, suture not impressed, oblique, rounded at angles. Tibiae straight. Exposed tergites and ventrites with strigulate microsculpture, evanescent on lateral areas of ventrite I. Pygidium notched, with apical margin broadly concave. Ventrite I rather densely and finely punctate on basomedian area, very finely and sparsely punctate on prevailing surface; submetacoxal areas 0.04 mm long, nearly as long as half of shortest interval between its margin and apical margin of ventrite; submetacoxal lines convex, rather finely punctate.

Male. Protarsomeres I to III slightly widened, with short tenent setae, protarsomere I narrower than apex of protibia. Mesotarsomeres I to III not widened. Aedeagus ( Figs 7, 8 ) 0.30 mm long.

Etymology. The species epithet is the Latinized name of the natural park in which it was collected.

Comments. This new species would fall in the key to Chinese Scaphisoma under couplet 64, to S. incisum Löbl, 2000 . The aedeagal characters suggest a relationship with S. taiwanum Löbl, 1980 . Scaphisoma tienmuschanum may be easily distinguished from the latter species, as from other Chinese congeners, by the shape of the median lobe and the parameres. It has the apical process of the median lobe much more inflexed, nearly perpendicular to the axis of the basal bulb, and the parameres weakly narrowing apicad (in lateral view) and not bent mesally (in dorsal view). Besides, the body is smaller and the spines of the internal sac are notably longer in S. tienmuschanum than in S. taiwanum .

Figures

Figs 7, 8. Scaphisoma tienmuschanum sp. nov., aedeagus in dorsal and lateral views, scale = 0.05 mm.