Scaphisoma bryanti, Löbl, 2023

Löbl, Ivan, 2023, On the Scaphidiinae (Coleoptera: Staphylinidae) of Java, Indonesia, Acta Musei Moraviae, Scientiae biologicae 108 (1 - 2), pp. 1-34 : 9-10

Scaphisoma bryanti sp. nov.

( Figs 8, 9 )

Material examined. Holotype male, Kawah Manoek , Java, G. E. Bryant. 10.iv.09 ( NHML). Paratype female, with same data as holotype ( MHNG).

Description. Length 2.92 2.95 mm, width 1.65 1.67 mm. Head and most of pronotum ochraceous. Basal margin of pronotum black; black area expanded mesally and nearly reaching pronotal mid­length, forming notched spot. Elytron ochraceous on prevailing surface, black or blackish along basal and lateral margins, and along suture up to light apical seventh. Dark lateral band expanding anterior of lateral mid­length to form small transverse band nearly reaching elytral mid­width. Margin of dark basal area irregular, denticulate and expanding along sutural stria to form wide band reaching somewhat posterior of elytral mid­length. Small light brown spot present on subapical elytral area. Epipleuron blackish. Hypomeron ochraceous with narrowly darkened basal and ventral margins. Venter of mesothorax and metathorax black. Ventrite I blackish on prevailing surface, becoming lighter apicad. Following ventrites yellowish. Appendages ochraceous to yellowish. Length/width ratios of antennomeres III 16/10: IV 40 /9: V 60 /9: VI 68 /11: VII 65 /15: VIII 55 /10: IX 68 /15: X 57 /15: XI: 73/17. Pronotum and elytra lacking microsculpture. Pronotum with rounded lateral margins, lateral carinae visible in dorsal view, lateral margin stria impunctate, discal punctation extremely fine, hardly visible at 100 times magnification. Tip of scutellum exposed, triangular. Elytron rather strongly narrowed apicad, with lateral margin oblique posterior of basal third; lateral margin carina exposed in dorsal view; lateral margin stria punctate; apical margin rounded; inner apical angle situated posterior of level of outer apical angle; apical crenulation present; sutural margin not raised; sutural stria shallow, starting at or posterior of level of scutellum, gradually converging to suture, adsutural area flat, near scutellum about 0.08 0.09 mm wide, very finely punctate; discal punctation much coarser than that on pronotum, punctures not clearly delimited, puncture intervals mostly about two to three times as large as puncture diameters. Hind wings fully developed. Hypomeron smooth. Mesanepisternum extremely finely and sparsely punctate, lacking microsculpture. Mesepimeron well five times as long as wide, nearly twice as long as interval between its tip and mesocoxa. Metaventrite with strigulate microsculpture, very finely and sparsely punctate; median area of metaventrite convex, lacking impressions or stria; antecoxal puncture rows present, poorly distinct. Submesocoxal areas about 0.04 mm long, about as long as seventh of shortest interval to metacoxa; submesocoxal lines nearly parallel, very finely punctate. Metanepisternum flat, lacking microsculpture, slightly narrowing anteriad, with suture straight except at rounded anterior angle. Protibiae and metatibiae straight, mesotibiae curved. Ventrites with strigulate microsculpture and punctation as fine and sparse as than on metaventrite. Ventrite I with submetacoxal areas 0.06 0.07 mm long, about as long as fourth of shortest interval to apical margin of ventrite, submetacoxal lines convex, very finely punctate.

Male. Protarsomeres and mesotarsomeres I to III distinctly widened, narrower than apex of protibia. Apical margin of ventrite VI subangulate, lacking distinct lobe. Aedeagus ( Figs 8, 9 ) 1.01 mm long.

Etymology. The species is named in honour of its collector, Gilbert Ernest Bryant (1878 1965).

Differential diagnosis. The conspicuous colour pattern of the pronotum of this new species is similar to that of S. testaceomaculatum , but the elytra are light on a much larger surface. The latter species differs notably by the elytra with sutural striae deep and much more converging to the suture, and the adsutural areas coarsely punctate. Unlike S. testaceomaculatum , S. bryanti has a symmetrical aedeagus and is a members of the S. pictum group. It may be distinguished from other species of the group by its large body size and the colour of the pronotum and elytra.

Figures

Figs 8-13. Male genitalia. 8 – Scaphisoma bryanti sp. nov., aedeagus in dorsal view, scale = 0.2 mm. 9 – Ditto, in ventral view, without proximal part of basal bulb, scale = 0.1 mm. 10, 11 – Scaphisoma drescheri sp. nov., aedeagus in dorsal and lateral views, scale = 0.1 mm. 12, 13 – Scaphisoma multispinosum sp. nov., aedeagus in dorsal and lateral views, scale = 0.1 mm.